NZ Historic Weather Events Catalog

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SevereAugust 1990 Tasman-Nelson Flooding and the Taranaki Tornado ( 1990-08-11 )

100 year

Severe damage to homes and businesses occurred when a tornado hit Bell Block and Inglewood on the 12th of August 1990. Tasman-Nelson experienced heavy rain causing extensive flooding in the Motueka area and resulting in millions of dollars worth of damage. Marlborough also experienced some flooding.

South Island

Multi HazardMulti Hazard at South Island
Duration:   3  days - Heavy rain and flooding occurred from the 11th to the 13th of August.
Comments:

Taranaki

TornadoTornado at Taranaki
Comments:

CommentA tornado ripped through Inglewood and Bell Block at 3:00am on the 12th of August.

Evacuees25 families (approximately 100 people) were evacuated..

Damage43 shops, homes and factories were severely damaged. Atleast 12 homes were destroyed.

Affected LifelinePower lines dangled from poles.

Property DamageRoofing iron was torn off houses.

ImpactThere were considerable amounts af damaged and uprooted trees.

ImpactAt 3:22am to 3:32am, the tornado travelled from the coast into Inglewood and out towards south Inglewood.

Physical CharacteristicWinds reached 165.6 km/hr.

DamageAccording to Taranaki Regional Council, 69 houses were damaged and three needed to be completely rebuilt.

Insurance ClaimThere were 179 insurance claims as at 17/12/1990 with an estimated value of $1,400,000 ($2,119,600 2009 dollars).

DamageThere was extensive damage to Inglewood Primary School. One block lost its roof, windows and sustained water damage. And another block lost quarter of its roof and also sustained water damage. There was damage to every block in the 20 room school but it reopened on the 16th.

DamageThe tornado toppled chimneys, smashed windows, and destroyed sheds.

ImpactThe cleanup took some time and the rebuilding took months.

ImpactIt ripped up a line of pine trees and deposited the branches inside houses hundreds of metres away.

Property DamageThe northern end of Underwood Engineering was ripped open by the tornado.

Property DamageSome houses on the western side of Maire Street were almost totally destroyed. On the eastern side, roofing iron, fences and trees were strewn about.

Physical CharacteristicThe wind was already gusting up to 46 knots (85.2 mk/hr) near the time of the tornado at Bell Block.

HailHail
Comments:

CommentAn intense hailstorm preceded the tornado.

Multi HazardMulti Hazard
Comments:

CommentThere was also heavy rain and lightning and cyclone force winds preceded the tornado.

Manawatu-Wanganui

Snow / IceSnow / Ice at Mount Ruapehu
Map Location: -39.278843 175.567271
Comments:

CommentA blizzard enveloped Mt Ruapehu on the 11th and 12th of August.

Impact11 army servicemen and 2 instructors went on a training trek on Mt Ruapehu. The party of 14 climbed the mountain on a fine day and became trapped at the crater rim by a sudden blizzard. The whiteout, freezing cold and high winds came without warning.

CasualtiesSix men (aged 18-23) were found dead in a trench on the most exposed part of the mountain.

InjuriesFive other soldiers were rescued in varying states of hypothermia and with frostbite.

High Wind GustsHigh Wind / Gust
Comments:

Peak Wind SpeedThere were wind gusts of up to 70 knots (130 km/hr).

Tasman-Nelson

Multi HazardMulti Hazard at Tasman-Nelson
Comments:

CauseA large low moved from central Tasman Sea south-eastwards to cross central South Island. Central pressures within the low were down to about 980hPa. A moist north-east flow affected Nelson area for a considerable period. A warm front crossed the area at 6am on the 11th. At noon on the 11th, wind at Stephens Island was 100/35kt, and at Farewell Spit was 060/30kt. This indicates low level convergence within the Nelson region. Nelson City reported continuous heavy rain at this time. A small low seen off West Coast was moving south-south-westwards, and its presence helped prolong the period of heavy rain. During the latter stages of the event, several convective bands crossed the area, as the flow turned slowly around to the north-west.

FloodingFlooding
Comments:

ImpactFlooding was severe in the Motueka area. The main feature of the flood was that damage was concentrated in a high-value horticultural area.

ImpactThere was severe flooding around the province. Floods cut roads, damaged homes, forced the evacuation of residents.

Damage CostTotal damage was estimated at $5,670,000 in 2004.

EvacueesThere were 30 people evacuated from Peach Island near Riwaka and Dehra Doon areas.

Affected LifelineIt took several days to reopen all the roads that were blocked.

Damage CostIt was estimated that the rain and flooding caused at least $3,000,000 ($4,542,000 2009 dollars) of damage to farmland.

Damage CostDamage to river stopbanks was estimated to cost more than $1,000,000 ($1,514,000 2009 dollars) to repair.

DamageFlooding resulted in silt-laden paddocks, submerged orchards, and lost fencing.

Damage CostFlood damage to the Motueka district was estimated to cost over $4,400,000 ($6,661,500 2009 dollars).

Damage CostIt was estimated that $220,000 ($333,000 2009 dollars) was needed to repair farm damage in Riwaka horticultural area.

Damage CostWork to clear minor drains using a fleet of small diggers cost an estimated $55,000 ($83,300 2009 dollars).

Damage CostThe cost of flood relief workers who started work on the 19th was estimated at $100,000 ($151,400 2009 dollars).

Damage CostIt was estimated that river, drainage and some slope stabilisation work cost $1,800,000 ($2,725,000 2009 dollars).

Damage CostIt was estimated that $1,200,000 ($1,817,000 2009 dollars) was needed by the Tasman District Council to restore roads under its control.

Damage CostThe Tasman District Council estimated that it cost $30,000 ($45,400 2009 dollars) to repair water supplies.

Insurance ClaimClaims totalling hundreds of thousands of dollars were made to the Earthquake and War Damages Commission and about 60 claims had been received by the 20th. Most of the claims were for damage caused by slips.

Affected LifelinePower was cut to Brooklyn, Peach Island and Lower Moutere.

ImpactResidents at Marahau, Little Sydney and Brooklyn valleys were isolated.

Affected LifelineTwin bridges at Marahau and Sandy Bay, the Shaggery, and Rocky Creek bridges were are out.

CommentRecords show the flood was about the fourth biggest ever.

FloodingFlooding at Appleby
Map Location: -41.301 173.11419
Comments:

EvacueesOne house (approximately four people) near Appleby bridge was evacuated.

Heavy RainHeavy Rain at Baton
Comments:

Physical CharacteristicBaton recorded 235 mm (23.5 cm) of rain ending 8:00am on the 12th.

FloodingFlooding at Brooklyn Valley
Map Location: -41.10046 172.93734
Comments:

Affected LifelineSeveral hundred residences were without power from 10:00pm on the 11thto 6.30pm on the 12th.

FloodingFlooding at Dovedale
Map Location: -41.28626 172.89702
Comments:

Affected LifelineDovedale water supply was cut off, affecting 330 homes.

Affected LifelinePower was cut for seven hours.

FloodingFlooding at Golden Bay
Map Location: -40.698766 172.864683
Comments:

InjuriesA man was injured in a motor vehicle accident at Pohara on the 11th.

InjuriesVictim with suspected spinal injuries was flown out of Golden Bay.

Impact90 people stranded in Golden Bay were flown out in 12 special flights.

ImpactGolden Bay residents and valleys on the west bank of the Motueka River were isolated for days.

FloodingFlooding at Gowan Valley
Map Location: -41.76489 172.58547
Comments:

Affected LifelinePower cut for three hours.

FloodingFlooding at Honeymoon Bay
Map Location: -41.03114 173.01916
Comments:

ImpactA bach was upturned at Honeymoon Bay.

FloodingFlooding at Kaiteriteri
Map Location: -41.039225 173.018605
Comments:

Affected LifelineSeveral hundred residences were without power on the 12th.

Heavy RainHeavy Rain at Maitai Valley
Map Location: -41.274305 173.306555
Comments:

Physical CharacteristicMaitai recorded 105 mm (10.5 cm) of rain ending 8:00am on the 12th.

LandslideLandslide at Marahau
Map Location: -41.00458 173.00697
Comments:

ImpactMarahau was isolated by slips.

FloodingFlooding at Motueka
Map Location: -41.10406 173.020407
Comments:

Declared EmergencyCivil Defence Emergency was declared in Motueka at 9:30am to 5:00pm on the 13th. It was declared when the rising Motueka River threatened to break its banks and flood many low-lying horticultural and residential areas.

ImpactFloodwaters inundated properties.

CommentIt was one of the worst floods in Motueka history and it could be classified as 100 year flood.

Affected LifelineRoads were washed out by rain, slips and flooding.

Damage CostThe estimated repair costs to roads were in the hundreds of thousands of dollars.

Affected LifelineFalling trees cut power to 1000 homes in Motueka.

CommentThe river level started to drop at 2:00pm on the 12th and by 4:30pm all rivers were in recession and rainfall had ceased throughout the district.

Affected LifelineThe Motueka to Kohatu road, State Highway 61, was closed by large slips especially in the Dovedale area and the Marahau-Sandy Bay road and the Kaiteriteri road were also cut.

DamageMost of the erosion damage was on the eastern side of the river.

CommentMotueka River had hovered at the peak flood level for about 24 hours.

Heavy RainHeavy Rain at Motueka Gorge
Comments:

Physical CharacteristicMotueka Gorge recorded 154 mm (15.4 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Moss Bush
Map Location: -41.049105 172.924045
Comments:

Physical CharacteristicMoss Bush recorded 349 mm (34.9 cm) of rain in 72 hours (which has a return period of 90 years).

Physical CharacteristicMoss Bush recorded 314 mm (31.4 cm) of rain in 48 hours (which has a return period of 116 years).

Physical CharacteristicMoss Bush recorded 224 mm (22.4 cm) of rain in 24 hours (which has a return period of 50 years).

Heavy RainHeavy Rain at Motupiko
Map Location: -41.4544 172.81194
Comments:

Physical CharacteristicMotupiko recorded 76 mm (7.6 cm) of rain ending 8:00am on the 12th.

LandslideLandslide at Nelson
Map Location: -41.268476 173.297338
Comments:

CommentThere was widespread slipping in Nelson.

FloodingFlooding at Pangatotara
Map Location: -41.17518 172.91254
Comments:

Affected LifelineThere were washouts on State Highway 61 at Pangatotara and at the southern approach to the Shaggery Bridge.

Heavy RainHeavy Rain at Pokororo
Map Location: -41.21562 172.84123
Comments:

Physical CharacteristicPokororo recorded 258 mm (25.8 cm) of rain in 24 hours.

LandslideLandslide
Comments:

Damage1000 cubic metres of debris crashed into a bedroom wall. The bedroom and the bathroom were damaged. The slip hit the garage, demolished the wall, then travelled through taking a 1975 Triumph 2500 car.

Heavy RainHeavy Rain at Riwaka
Map Location: -41.078397 172.990055
Comments:

Physical CharacteristicRiwaka recorded 293 mm (29.3 cm) of rain over the 11th and the 12th.

FloodingFlooding
Comments:

CommentRiwaka River had two breaches of the stopbank. The river first breached the true right stopbank and a more extensive 60 m long breach followed further upstream. Volunteers were called in to lay sandbags.

Physical CharacteristicBaton and Tadmor tributaries reached heights of 3.2m and 2.9m respectively.

ImpactTwelve people were rescued from Riwaka by the coastguard boat.

EvacueesPeople were evacuated from the Riwaka Hotel area.

CasualtiesA 49 year old man died while attempting to cross the swollen Little Sydney Valley Stream on the 11th, near Swamp Road, Riwaka.

Crop DamageKiwifruit growers round Riwaka were desperately pumping water from their fields on the 14th and many apple and nashi pear orchards were still underwater.

ImpactThe Riwaka Valley was cut in several places by slips. One of the biggest covered the road and also buried a stock yard, leaving only the top rail of the 1.8 m high stock fence visible.

CommentLong time residents of Riwaka district said it was the worst flood they had ever known.

Evacuees22 people were evacuated by helicopter from the area known as Peach Island, after water began entering their propeties and had completely cut off the area.

LandslideLandslide
Comments:

EvacueesSeveral houses at Debra Doon were hit by slips. Late in the day on the 12th, properties at Dehra Doon Road near Riwaka were evacuated because of fears that the Dehra Doon hill might slide, endangering properties below.

Heavy RainHeavy Rain at Stanley Brook
Map Location: -41.32409 172.81528
Comments:

Physical CharacteristicStanley Brook recorded 250 mm (25.0 cm) of rain in 36 hours.

Physical CharacteristicStanley Brook recorded 305 mm (30.5 cm) of rain in 48 hours.

Heavy RainHeavy Rain at Tadmor
Map Location: -41.43742 172.75123
Comments:

Physical CharacteristicTadmor recorded 136 mm (13.6 cm) of rain ending 8:00am on the 12th.

LandslideLandslide at Takaka Hill
Map Location: -41.03462 172.85033
Comments:

ImpactTakaka Hill had extensive slips. Two empty cars and a truck at the foot of Takaka Hill were swept 50 m by slips.

ImpactA massive slip forced a family to flee their home.

Damage CostIt was estimated that Takaka Hill Road would cost $1,000,000 ($1,514,000 2009 dollars) to restore. And of this figure, $220,000 ($333,000 2009 dollars) is the cost for reopening 7 km of damaged road.

FloodingFlooding at Tapawera
Map Location: -41.38531 172.823799
Comments:

Affected LifelinePower was cut for seven hours.

FloodingFlooding at Upper Moutere
Map Location: -41.271549 173.008514
Comments:

Affected LifelineThe Moutere highway was reduced to one way traffic.

Heavy RainHeavy Rain at Upper Takaka
Map Location: -41.027833 172.823593
Comments:

Physical CharacteristicUpper Takaka recorded 179 mm (17.9 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Waimea Plains
Map Location: -41.33657 173.119
Comments:

Physical CharacteristicLee Gauge, above the Waimea Plains recorded 148 mm (14.8 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Waingaro River
Map Location: -41.05685 172.62007
Comments:

Physical CharacteristicWaingaro River, 12 km from Takaka township, recorded 336 mm (33.6 cm) in 36 hours ending 8:00am on the 12th.

Heavy RainHeavy Rain at Wairoa Gorge
Map Location: -41.47435 173.08185
Comments:

Physical CharacteristicMouth of Wairoa Gorge recorded 150 mm (15.0 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Wangapeka
Map Location: -41.44632 172.51306
Comments:

Physical CharacteristicWangapeka recorded 280 mm (28.0 cm) of rain during the 36 hours on the 11th and 12th.

Heavy RainHeavy Rain at Woodstock
Map Location: -41.26017 172.82591
Comments:

Physical CharacteristicWoodstock recorded 280 mm (28.0 cm) of rain during the storm.

FloodingFlooding
Comments:

Peak River LevelMotueka River reached at 6.05 m peak at Woodstock.

Stock DamageFarmers with ewes lambing early, lost many lambs.

Affected LifelinePower was lost for seven hours.

LandslideLandslide
Comments:

DamageFences flattened by slips in the Woodstock Junction area.

Stock DamageOne farmer lost 5 sheep when 30 sheep were buried alive in a slip.

LandslideLandslide
Comments:

Affected LifelineTakaka Hill Road, State Highway 6 to Golden Bay was cut in several places by large slips and washouts.

Marlborough

Heavy RainHeavy Rain at Marlborough
Comments:

Physical CharacteristicMarlborough recorded 80-100 mm (8-10 cm) of rain in 40 hours.

FloodingFlooding
Comments:

DamageA kiwifruit packing shed was demolished.

CommentRivers were high.

Affected LifelineThere were several dropouts and slips in the steep country of the Marlborough Sounds which closed a number of roads.

Affected LifelineQueen Charlotte Drive was closed.

Affected LifelineKenepuru Road was closed.

LandslideLandslide
Comments:

Affected LifelineBulwer Road at Ronga was damaged by slips.

FloodingFlooding at Titirangi
Map Location: -41.02099 174.14046
Comments:

Affected LifelineWaitui Road at Titirangi was closed.

FloodingFlooding at Wairau River
Map Location: -41.484059 173.79526
Comments:

Damage CostRepair cost estimated for the lower Wairau River system and the above Waihopai was $423,000 ($640,400 2009 dollars).

References

Headline: Civil Defence Declarations since 1 January 1963
Declared Civil Defence Emergencies,
Graham, Alan (2005). Lost on Ruapehu: The Fatal Blizzard of 1931.
Major weather events in New Zealand, FLOODS and HIGH RAINFALL to 31st May 2006
Meteorological Society of New Zealand (Inc.) Newsletter 42, September 1990.
NZ Met Service. (2008). Meteorology of Extreme Rainfalls in New Zealand (Mark Pascoe, Ed.).
Taranaki Regional Council Report (1990). Tornado Event: Inglewood and Waitara, 12 August 1990.
Headline: Rain causes only minor damage in Marlborough.
The Marlborough Express, 13 August 1990.
Headline: A damaging flood.
The Nelson Evening Mail, 13 August 1990.
Headline: Emergency declared in Motueka.
The Nelson Evening Mail, 13 August 1990.
Headline: Golden Bay cut off.
The Nelson Evening Mail, 13 August 1990.
Headline: Man swept away in torrent.
The Nelson Evening Mail, 13 August 1990.
Headline: Riwaka breaches surprise.
The Nelson Evening Mail, 13 August 1990.
Headline: Tornado rips through north Taranaki
The Nelson Evening Mail, 13 August 1990.
Headline: Accident victim flown out of Golden Bay.
The Nelson Evening Mail, 14 August 1990.
Headline: Hillside crashes into house.
The Nelson Evening Mail, 14 August 1990.
Headline: Sheep buried alive in slips.
The Nelson Evening Mail, 14 August 1990.
Headline: Flood areas may be cut off for days.
The Press, 13 August 1990.
Headline: Tornado rips towns apart.
The Press, 13 August 1990.
Headline: Tornadoes remain unexplained.
The Press, 13 August 1990.
Headline: Swamped orchards, no fences legacy of flood.
The Press, 14 August 1990.
Headline: Motueka flooding to cost more than $4m.
The Press, 20 August 1990.
Headline: Rates rise after floods?
The Press, Source: PA, 23 August 1990.
Headline: Fatal storm haunts Army.
www.nzherald.co.nz, 12 August 2000.

SevereAugust 1990 Tasman-Nelson Flooding and the Taranaki Tornado ( 1990-08-11 )

100 year

Severe damage to homes and businesses occurred when a tornado hit Bell Block and Inglewood on the 12th of August 1990. Tasman-Nelson experienced heavy rain causing extensive flooding in the Motueka area and resulting in millions of dollars worth of damage. Marlborough also experienced some flooding.

South Island

Multi HazardMulti Hazard at South Island
Duration:   3  days - Heavy rain and flooding occurred from the 11th to the 13th of August.
Comments:

Taranaki

TornadoTornado at Taranaki
Comments:

CommentA tornado ripped through Inglewood and Bell Block at 3:00am on the 12th of August.

Evacuees25 families (approximately 100 people) were evacuated..

Damage43 shops, homes and factories were severely damaged. Atleast 12 homes were destroyed.

Affected LifelinePower lines dangled from poles.

Property DamageRoofing iron was torn off houses.

ImpactThere were considerable amounts af damaged and uprooted trees.

ImpactAt 3:22am to 3:32am, the tornado travelled from the coast into Inglewood and out towards south Inglewood.

Physical CharacteristicWinds reached 165.6 km/hr.

DamageAccording to Taranaki Regional Council, 69 houses were damaged and three needed to be completely rebuilt.

Insurance ClaimThere were 179 insurance claims as at 17/12/1990 with an estimated value of $1,400,000 ($2,119,600 2009 dollars).

DamageThere was extensive damage to Inglewood Primary School. One block lost its roof, windows and sustained water damage. And another block lost quarter of its roof and also sustained water damage. There was damage to every block in the 20 room school but it reopened on the 16th.

DamageThe tornado toppled chimneys, smashed windows, and destroyed sheds.

ImpactThe cleanup took some time and the rebuilding took months.

ImpactIt ripped up a line of pine trees and deposited the branches inside houses hundreds of metres away.

Property DamageThe northern end of Underwood Engineering was ripped open by the tornado.

Property DamageSome houses on the western side of Maire Street were almost totally destroyed. On the eastern side, roofing iron, fences and trees were strewn about.

Physical CharacteristicThe wind was already gusting up to 46 knots (85.2 mk/hr) near the time of the tornado at Bell Block.

HailHail
Comments:

CommentAn intense hailstorm preceded the tornado.

Multi HazardMulti Hazard
Comments:

CommentThere was also heavy rain and lightning and cyclone force winds preceded the tornado.

Manawatu-Wanganui

Snow / IceSnow / Ice at Mount Ruapehu
Map Location: -39.278843 175.567271
Comments:

CommentA blizzard enveloped Mt Ruapehu on the 11th and 12th of August.

Impact11 army servicemen and 2 instructors went on a training trek on Mt Ruapehu. The party of 14 climbed the mountain on a fine day and became trapped at the crater rim by a sudden blizzard. The whiteout, freezing cold and high winds came without warning.

CasualtiesSix men (aged 18-23) were found dead in a trench on the most exposed part of the mountain.

InjuriesFive other soldiers were rescued in varying states of hypothermia and with frostbite.

High Wind GustsHigh Wind / Gust
Comments:

Peak Wind SpeedThere were wind gusts of up to 70 knots (130 km/hr).

Tasman-Nelson

Multi HazardMulti Hazard at Tasman-Nelson
Comments:

CauseA large low moved from central Tasman Sea south-eastwards to cross central South Island. Central pressures within the low were down to about 980hPa. A moist north-east flow affected Nelson area for a considerable period. A warm front crossed the area at 6am on the 11th. At noon on the 11th, wind at Stephens Island was 100/35kt, and at Farewell Spit was 060/30kt. This indicates low level convergence within the Nelson region. Nelson City reported continuous heavy rain at this time. A small low seen off West Coast was moving south-south-westwards, and its presence helped prolong the period of heavy rain. During the latter stages of the event, several convective bands crossed the area, as the flow turned slowly around to the north-west.

FloodingFlooding
Comments:

ImpactFlooding was severe in the Motueka area. The main feature of the flood was that damage was concentrated in a high-value horticultural area.

ImpactThere was severe flooding around the province. Floods cut roads, damaged homes, forced the evacuation of residents.

Damage CostTotal damage was estimated at $5,670,000 in 2004.

EvacueesThere were 30 people evacuated from Peach Island near Riwaka and Dehra Doon areas.

Affected LifelineIt took several days to reopen all the roads that were blocked.

Damage CostIt was estimated that the rain and flooding caused at least $3,000,000 ($4,542,000 2009 dollars) of damage to farmland.

Damage CostDamage to river stopbanks was estimated to cost more than $1,000,000 ($1,514,000 2009 dollars) to repair.

DamageFlooding resulted in silt-laden paddocks, submerged orchards, and lost fencing.

Damage CostFlood damage to the Motueka district was estimated to cost over $4,400,000 ($6,661,500 2009 dollars).

Damage CostIt was estimated that $220,000 ($333,000 2009 dollars) was needed to repair farm damage in Riwaka horticultural area.

Damage CostWork to clear minor drains using a fleet of small diggers cost an estimated $55,000 ($83,300 2009 dollars).

Damage CostThe cost of flood relief workers who started work on the 19th was estimated at $100,000 ($151,400 2009 dollars).

Damage CostIt was estimated that river, drainage and some slope stabilisation work cost $1,800,000 ($2,725,000 2009 dollars).

Damage CostIt was estimated that $1,200,000 ($1,817,000 2009 dollars) was needed by the Tasman District Council to restore roads under its control.

Damage CostThe Tasman District Council estimated that it cost $30,000 ($45,400 2009 dollars) to repair water supplies.

Insurance ClaimClaims totalling hundreds of thousands of dollars were made to the Earthquake and War Damages Commission and about 60 claims had been received by the 20th. Most of the claims were for damage caused by slips.

Affected LifelinePower was cut to Brooklyn, Peach Island and Lower Moutere.

ImpactResidents at Marahau, Little Sydney and Brooklyn valleys were isolated.

Affected LifelineTwin bridges at Marahau and Sandy Bay, the Shaggery, and Rocky Creek bridges were are out.

CommentRecords show the flood was about the fourth biggest ever.

FloodingFlooding at Appleby
Map Location: -41.301 173.11419
Comments:

EvacueesOne house (approximately four people) near Appleby bridge was evacuated.

Heavy RainHeavy Rain at Baton
Comments:

Physical CharacteristicBaton recorded 235 mm (23.5 cm) of rain ending 8:00am on the 12th.

FloodingFlooding at Brooklyn Valley
Map Location: -41.10046 172.93734
Comments:

Affected LifelineSeveral hundred residences were without power from 10:00pm on the 11thto 6.30pm on the 12th.

FloodingFlooding at Dovedale
Map Location: -41.28626 172.89702
Comments:

Affected LifelineDovedale water supply was cut off, affecting 330 homes.

Affected LifelinePower was cut for seven hours.

FloodingFlooding at Golden Bay
Map Location: -40.698766 172.864683
Comments:

InjuriesA man was injured in a motor vehicle accident at Pohara on the 11th.

InjuriesVictim with suspected spinal injuries was flown out of Golden Bay.

Impact90 people stranded in Golden Bay were flown out in 12 special flights.

ImpactGolden Bay residents and valleys on the west bank of the Motueka River were isolated for days.

FloodingFlooding at Gowan Valley
Map Location: -41.76489 172.58547
Comments:

Affected LifelinePower cut for three hours.

FloodingFlooding at Honeymoon Bay
Map Location: -41.03114 173.01916
Comments:

ImpactA bach was upturned at Honeymoon Bay.

FloodingFlooding at Kaiteriteri
Map Location: -41.039225 173.018605
Comments:

Affected LifelineSeveral hundred residences were without power on the 12th.

Heavy RainHeavy Rain at Maitai Valley
Map Location: -41.274305 173.306555
Comments:

Physical CharacteristicMaitai recorded 105 mm (10.5 cm) of rain ending 8:00am on the 12th.

LandslideLandslide at Marahau
Map Location: -41.00458 173.00697
Comments:

ImpactMarahau was isolated by slips.

FloodingFlooding at Motueka
Map Location: -41.10406 173.020407
Comments:

Declared EmergencyCivil Defence Emergency was declared in Motueka at 9:30am to 5:00pm on the 13th. It was declared when the rising Motueka River threatened to break its banks and flood many low-lying horticultural and residential areas.

ImpactFloodwaters inundated properties.

CommentIt was one of the worst floods in Motueka history and it could be classified as 100 year flood.

Affected LifelineRoads were washed out by rain, slips and flooding.

Damage CostThe estimated repair costs to roads were in the hundreds of thousands of dollars.

Affected LifelineFalling trees cut power to 1000 homes in Motueka.

CommentThe river level started to drop at 2:00pm on the 12th and by 4:30pm all rivers were in recession and rainfall had ceased throughout the district.

Affected LifelineThe Motueka to Kohatu road, State Highway 61, was closed by large slips especially in the Dovedale area and the Marahau-Sandy Bay road and the Kaiteriteri road were also cut.

DamageMost of the erosion damage was on the eastern side of the river.

CommentMotueka River had hovered at the peak flood level for about 24 hours.

Heavy RainHeavy Rain at Motueka Gorge
Comments:

Physical CharacteristicMotueka Gorge recorded 154 mm (15.4 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Moss Bush
Map Location: -41.049105 172.924045
Comments:

Physical CharacteristicMoss Bush recorded 349 mm (34.9 cm) of rain in 72 hours (which has a return period of 90 years).

Physical CharacteristicMoss Bush recorded 314 mm (31.4 cm) of rain in 48 hours (which has a return period of 116 years).

Physical CharacteristicMoss Bush recorded 224 mm (22.4 cm) of rain in 24 hours (which has a return period of 50 years).

Heavy RainHeavy Rain at Motupiko
Map Location: -41.4544 172.81194
Comments:

Physical CharacteristicMotupiko recorded 76 mm (7.6 cm) of rain ending 8:00am on the 12th.

LandslideLandslide at Nelson
Map Location: -41.268476 173.297338
Comments:

CommentThere was widespread slipping in Nelson.

FloodingFlooding at Pangatotara
Map Location: -41.17518 172.91254
Comments:

Affected LifelineThere were washouts on State Highway 61 at Pangatotara and at the southern approach to the Shaggery Bridge.

Heavy RainHeavy Rain at Pokororo
Map Location: -41.21562 172.84123
Comments:

Physical CharacteristicPokororo recorded 258 mm (25.8 cm) of rain in 24 hours.

LandslideLandslide
Comments:

Damage1000 cubic metres of debris crashed into a bedroom wall. The bedroom and the bathroom were damaged. The slip hit the garage, demolished the wall, then travelled through taking a 1975 Triumph 2500 car.

Heavy RainHeavy Rain at Riwaka
Map Location: -41.078397 172.990055
Comments:

Physical CharacteristicRiwaka recorded 293 mm (29.3 cm) of rain over the 11th and the 12th.

FloodingFlooding
Comments:

CommentRiwaka River had two breaches of the stopbank. The river first breached the true right stopbank and a more extensive 60 m long breach followed further upstream. Volunteers were called in to lay sandbags.

Physical CharacteristicBaton and Tadmor tributaries reached heights of 3.2m and 2.9m respectively.

ImpactTwelve people were rescued from Riwaka by the coastguard boat.

EvacueesPeople were evacuated from the Riwaka Hotel area.

CasualtiesA 49 year old man died while attempting to cross the swollen Little Sydney Valley Stream on the 11th, near Swamp Road, Riwaka.

Crop DamageKiwifruit growers round Riwaka were desperately pumping water from their fields on the 14th and many apple and nashi pear orchards were still underwater.

ImpactThe Riwaka Valley was cut in several places by slips. One of the biggest covered the road and also buried a stock yard, leaving only the top rail of the 1.8 m high stock fence visible.

CommentLong time residents of Riwaka district said it was the worst flood they had ever known.

Evacuees22 people were evacuated by helicopter from the area known as Peach Island, after water began entering their propeties and had completely cut off the area.

LandslideLandslide
Comments:

EvacueesSeveral houses at Debra Doon were hit by slips. Late in the day on the 12th, properties at Dehra Doon Road near Riwaka were evacuated because of fears that the Dehra Doon hill might slide, endangering properties below.

Heavy RainHeavy Rain at Stanley Brook
Map Location: -41.32409 172.81528
Comments:

Physical CharacteristicStanley Brook recorded 250 mm (25.0 cm) of rain in 36 hours.

Physical CharacteristicStanley Brook recorded 305 mm (30.5 cm) of rain in 48 hours.

Heavy RainHeavy Rain at Tadmor
Map Location: -41.43742 172.75123
Comments:

Physical CharacteristicTadmor recorded 136 mm (13.6 cm) of rain ending 8:00am on the 12th.

LandslideLandslide at Takaka Hill
Map Location: -41.03462 172.85033
Comments:

ImpactTakaka Hill had extensive slips. Two empty cars and a truck at the foot of Takaka Hill were swept 50 m by slips.

ImpactA massive slip forced a family to flee their home.

Damage CostIt was estimated that Takaka Hill Road would cost $1,000,000 ($1,514,000 2009 dollars) to restore. And of this figure, $220,000 ($333,000 2009 dollars) is the cost for reopening 7 km of damaged road.

FloodingFlooding at Tapawera
Map Location: -41.38531 172.823799
Comments:

Affected LifelinePower was cut for seven hours.

FloodingFlooding at Upper Moutere
Map Location: -41.271549 173.008514
Comments:

Affected LifelineThe Moutere highway was reduced to one way traffic.

Heavy RainHeavy Rain at Upper Takaka
Map Location: -41.027833 172.823593
Comments:

Physical CharacteristicUpper Takaka recorded 179 mm (17.9 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Waimea Plains
Map Location: -41.33657 173.119
Comments:

Physical CharacteristicLee Gauge, above the Waimea Plains recorded 148 mm (14.8 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Waingaro River
Map Location: -41.05685 172.62007
Comments:

Physical CharacteristicWaingaro River, 12 km from Takaka township, recorded 336 mm (33.6 cm) in 36 hours ending 8:00am on the 12th.

Heavy RainHeavy Rain at Wairoa Gorge
Map Location: -41.47435 173.08185
Comments:

Physical CharacteristicMouth of Wairoa Gorge recorded 150 mm (15.0 cm) of rain ending 8:00am on the 12th.

Heavy RainHeavy Rain at Wangapeka
Map Location: -41.44632 172.51306
Comments:

Physical CharacteristicWangapeka recorded 280 mm (28.0 cm) of rain during the 36 hours on the 11th and 12th.

Heavy RainHeavy Rain at Woodstock
Map Location: -41.26017 172.82591
Comments:

Physical CharacteristicWoodstock recorded 280 mm (28.0 cm) of rain during the storm.

FloodingFlooding
Comments:

Peak River LevelMotueka River reached at 6.05 m peak at Woodstock.

Stock DamageFarmers with ewes lambing early, lost many lambs.

Affected LifelinePower was lost for seven hours.

LandslideLandslide
Comments:

DamageFences flattened by slips in the Woodstock Junction area.

Stock DamageOne farmer lost 5 sheep when 30 sheep were buried alive in a slip.

LandslideLandslide
Comments:

Affected LifelineTakaka Hill Road, State Highway 6 to Golden Bay was cut in several places by large slips and washouts.

Marlborough

Heavy RainHeavy Rain at Marlborough
Comments:

Physical CharacteristicMarlborough recorded 80-100 mm (8-10 cm) of rain in 40 hours.

FloodingFlooding
Comments:

DamageA kiwifruit packing shed was demolished.

CommentRivers were high.

Affected LifelineThere were several dropouts and slips in the steep country of the Marlborough Sounds which closed a number of roads.

Affected LifelineQueen Charlotte Drive was closed.

Affected LifelineKenepuru Road was closed.

LandslideLandslide
Comments:

Affected LifelineBulwer Road at Ronga was damaged by slips.

FloodingFlooding at Titirangi
Map Location: -41.02099 174.14046
Comments:

Affected LifelineWaitui Road at Titirangi was closed.

FloodingFlooding at Wairau River
Map Location: -41.484059 173.79526
Comments:

Damage CostRepair cost estimated for the lower Wairau River system and the above Waihopai was $423,000 ($640,400 2009 dollars).

References

Headline: Civil Defence Declarations since 1 January 1963
Declared Civil Defence Emergencies,
Graham, Alan (2005). Lost on Ruapehu: The Fatal Blizzard of 1931.
Major weather events in New Zealand, FLOODS and HIGH RAINFALL to 31st May 2006
Meteorological Society of New Zealand (Inc.) Newsletter 42, September 1990.
NZ Met Service. (2008). Meteorology of Extreme Rainfalls in New Zealand (Mark Pascoe, Ed.).
Taranaki Regional Council Report (1990). Tornado Event: Inglewood and Waitara, 12 August 1990.
Headline: Rain causes only minor damage in Marlborough.
The Marlborough Express, 13 August 1990.
Headline: A damaging flood.
The Nelson Evening Mail, 13 August 1990.
Headline: Emergency declared in Motueka.
The Nelson Evening Mail, 13 August 1990.
Headline: Golden Bay cut off.
The Nelson Evening Mail, 13 August 1990.
Headline: Man swept away in torrent.
The Nelson Evening Mail, 13 August 1990.
Headline: Riwaka breaches surprise.
The Nelson Evening Mail, 13 August 1990.
Headline: Tornado rips through north Taranaki
The Nelson Evening Mail, 13 August 1990.
Headline: Accident victim flown out of Golden Bay.
The Nelson Evening Mail, 14 August 1990.
Headline: Hillside crashes into house.
The Nelson Evening Mail, 14 August 1990.
Headline: Sheep buried alive in slips.
The Nelson Evening Mail, 14 August 1990.
Headline: Flood areas may be cut off for days.
The Press, 13 August 1990.
Headline: Tornado rips towns apart.
The Press, 13 August 1990.
Headline: Tornadoes remain unexplained.
The Press, 13 August 1990.
Headline: Swamped orchards, no fences legacy of flood.
The Press, 14 August 1990.
Headline: Motueka flooding to cost more than $4m.
The Press, 20 August 1990.
Headline: Rates rise after floods?
The Press, Source: PA, 23 August 1990.
Headline: Fatal storm haunts Army.
www.nzherald.co.nz, 12 August 2000.