March 1998 Southern NZ Ex-tropical Cyclone Yali ( 1998-03-28 )
  • Download as PDF
  • Download as XML

Ex-tropical cyclone Yali brought high winds, heavy rain, high seas and some flooding to all regions in the South Island as well as Wellington. One person was drowned in the sea in Taranaki.

New Zealand

Multi HazardMulti Hazard at New Zealand

Duration:   2  days - From the 28th till the 29th of March.

CauseA deep depression, former tropical cyclone "Yali", moved from the Tasman Sea across the South Island, deepening rapidly. On the 28th, Yali accelerated southeast over the central Tasman, entrained in the northwesterly "steering" flow ahead of an approaching trough over Tasmania.

CommentThe storm's main impact was gale force winds, with heavy rain a less important factor.

CommentDue to Yali's fast movement, the worst of the gales and heavy rain was confined to a period of less than 12 hours.

North Island

Heavy RainHeavy Rain at North Island

Physical CharacteristicThe Tararuas recorded rainfall totals exceeding 100 mm (10 cm).

South Island

Maritime / CoastalMaritime / Coastal at South Island

Affected LifelineFour Lynx ferry sailings were cancelled.

High Wind GustsHigh Wind / Gust

Affected LifelineTrees blown over by gales closed a major route between Nelson and Picton.

Taranaki

Maritime / CoastalMaritime / Coastal at New Plymouth

CasualtiesNear New Plymouth, a youth was washed into the sea and drowned.

Wellington

High Wind GustsHigh Wind / Gust at Wellington

Property DamageNortherly gales lifted house roofs.

Affected LifelinePower was cut in some places.

DamageA car was hit by a flying billboard, trees were felled and windows were blown in.

High Wind GustsHigh Wind / Gust at Castlepoint

Peak Wind SpeedCastlepoint recorded a peak wind gust of 156 km/hr.

High Wind GustsHigh Wind / Gust at Hataitai

Property DamageThe wind blew roofing off Badminton Hall.

High Wind GustsHigh Wind / Gust at Mt Kaukau

Peak Wind SpeedMt Kaukau recorded a peak wind gust of 165 km/hr.

Physical CharacteristicMt Kaukau recorded an average wind speed of 130 km/hr.

FloodingFlooding at Paraparaumu

ImpactIn Paraparaumu house basements were flooded after a sudden deluge of rain.

High Wind GustsHigh Wind / Gust at Seatoun

Peak Wind SpeedBeacon Hill, Seatoun, recorded a peak wind gust of 139 km/hr.

FloodingFlooding at Waikanae

ImpactIn Waikanae house basements were flooded after a sudden deluge of rain.

High Wind GustsHigh Wind / Gust at Wellington International Airport

Affected LifelineThe high winds disrupted flights at Wellington Airport. Some aircraft were diverted from a dangerous landing in the airport and flights out of Wellington were delayed on the 29th.

Marlborough

High Wind GustsHigh Wind / Gust at Marlborough

Affected LifelinePower cuts caused by fallen power lines occurred in Marlborough.

High Wind GustsHigh Wind / Gust at Raupara

Affected LifelineRapaura Road was closed after trees were blown over by the winds.

Tasman-Nelson

Heavy RainHeavy Rain at Tasman-Nelson

Physical CharacteristicNorthwest Nelson recorded rainfall totals exceeding 100 mm (10 cm).

High Wind GustsHigh Wind / Gust

Affected LifelinePower cuts caused by fallen power lines occurred in Nelson.

Maritime / CoastalMaritime / Coastal at Ruby Bay

CommentRough seas and a high tide caused sea flooding at Ruby Bay.

West Coast

High Wind GustsHigh Wind / Gust at West Coast

Affected LifelinePower cuts caused by fallen power lines occurred along the West Coast.

Heavy RainHeavy Rain

Physical CharacteristicThe West Coast recorded rainfall totals exceeding 100 mm (10 cm).

Heavy RainHeavy Rain at Cropp River

Peak RainfallCropp recorded 267 mm (26.7 cm) of rain - the heaviest rainfall for this event.

High Wind GustsHigh Wind / Gust at Hokitika

Physical CharacteristicHokitika recorded an average wind speed of 65 km/hr - only the second gale averaging 34 knots (63 km/hr) or more in six years.

Peak Wind SpeedHokitika recorded a peak gust of 102 km/hr.

Maritime / CoastalMaritime / Coastal at Westport

CommentWestport suffered sea flooding.

Canterbury

Multi HazardMulti Hazard at Canterbury

Affected LifelineMany inland roads became treacherous for driving.

High Wind GustsHigh Wind / Gust at Banks Peninsula

Affected LifelinePower cuts caused by fallen power lines occurred in Banks Peninsula.

High Wind GustsHigh Wind / Gust at Christchurch

Affected LifelinePower cuts caused by fallen power lines occurred in Christchurch.

High Wind GustsHigh Wind / Gust at Mount Cook Aerodrome

Peak Wind SpeedMt Cook Aerodrome recorded a wind gust of 156 km/hr.

Otago

Maritime / CoastalMaritime / Coastal at Dunedin

DamageThe winds whipped up sea waves, which damaged the esplanade in Dunedin.

Southland

Multi HazardMulti Hazard at Southland

CommentSouthland was hit by severe winds and driving rain on the 29th.

High Wind GustsHigh Wind / Gust

Affected LifelinePower was cut to some areas.

DamageSome roofs were lifted.

Physical CharacteristicWinds averaged between 67 km/hr and 80 km/hr on the afternoon of the 29th, but eased to between 40 km/hr and 55 km/hr by the evening.

FloodingFlooding

CommentThere was minor flooding in places.

CommentRivers through the region were high but not extreme.

Heavy RainHeavy Rain

Physical Characteristic31 mm (3.1 cm) of rain fell in 13 hours from 3am to 11am on the 29th.

Maritime / CoastalMaritime / Coastal at Bluff

Physical CharacteristicOn the 29th, the sea level at Bluff was 1.65 m above mean sea level.

High Wind GustsHigh Wind / Gust at Gorge Road

Affected LifelinePower was lost in Gorge Road at about 1:15pm after trees fell on to power lines.

Multi HazardMulti Hazard at Invercargill

CommentWaters threatened to top the estuary stopbank, being level with the top of the stopbank at about 3pm. The high water level was caused by a combination of a high spring tide, wind and rain.

Maritime / CoastalMaritime / Coastal

ImpactPaddocks on one farm were flooded as water spilled over low areas of the stopbank and water also gushed through a shed on the stopbank.

Physical CharacteristicOn the 29th, the Invercargill estuary at the Stead Street Bridge recorded a level of 2.51 m above mean sea level. This was the highest level recorded between 1992 and 2002 and was within 0.06 m of the record level. This had an annual return period of 11.2 years.

High Wind GustsHigh Wind / Gust

Peak Wind SpeedInvercargill recorded a peak gust of 111 km/hr on the 29th.

High Wind GustsHigh Wind / Gust at Kennington

Affected LifelinePower was lost in Kennington at about 1:15pm after trees fell on to power lines.

High Wind GustsHigh Wind / Gust at Te Peka

Affected LifelinePower was lost in Te Peku at about 1:15pm after trees fell on to power lines.

High Wind GustsHigh Wind / Gust at Waituna

Affected LifelinePower was lost in Waituna at about 1:15pm after trees fell on to power lines.

References

Bradley, D. (2002). Storm surge and marine inundation. Environment Southland, Invercargill.
Headline: Gales disrupt travel in region.
The Evening Post, March 30 1998.
Meteorological Society of New Zealand (Inc.) Newsletter 73, June 1998.
www.metservice/notable weather events.govt.nz
Headline: Southland feels sting in tropical cyclone's tail.
The Southland Times, 30 March 1998.