Tonga – Tropical Cyclone Gita Causes Devastation

Tropical Cyclone Gita passed through the Kingdom of Tonga just 40 km from the capital city of Nuku’alofa as a Category 4 cyclone, with winds up to 200 km per hour. According to the UK Met office, Gita is the worst cyclone to pass so close to Tonga’s main islands in 60 years.

NASA’s Terra satellite saw powerful Tropical Cyclone Gita in the South Pacific Ocean on Feb. 12 at 5:20 p.m. EST (22:20 UTC). Fiji is located northwest of the storm. Credit: NASA Goddard MODIS Rapid Response Team

The islands of Tongatapu and ‘Eua and some parts of Ha’apai Group were severely affected. Damage included roofs ripped from houses, flooding, fallen trees and cut power. Parts of Parliament House and other public buildings suffered significant damage. The Tongan police headquarters in Longolongo was severely damaged.

According a report (pdf) by the United Nations Office for the Coordination of Humanitarian Affairs (OCHA), 1 person was killed as a result of the storm. OCHA also said that that 95 houses were destroyed and a further 960 damaged. As many as 3,900 people have been evacuated and are staying in 108 evacuation centres.

Some flooding was reported in Tonga, although by far the worst of the damage appears to have been caused by strong winds. Some significant rainfall was recorded in Niuafoʻou, the most northerly island in the kingdom of Tonga, with 68.6mm falling in 24 hours to 11 February. However, available rainfall records are limited.

Gita passed close to Ono-I-Lau island of Fiji on 13 February. On 14 February the storm was located 200 km south-west of Kandavu island and had maximum sustained winds of 213 km/h.

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Forecast

The Tropical Cyclone is forecast to continue moving west-southwest. It could pass approximately 300-350 km south of Tafea group of Islands (Vanuatu) on 15 February and 150-250 km south of New Caledonia on 16 February. Heavy rain and strong winds could affect southern Vanuatu, New Caledonia and continue to affect the Western Division of Fiji over 13-16 February.

New Caledonia is still recovering from the impact of Tropical Cyclone Fehi that swept past the islands during late January causing severe wind damage and flooding.  Météo Nouvelle-Calédonie said that during the course of storm Fehi, 432 mm of rain fell in Nouméa.

Flood Summary

Last updated: February 21, 2018
Event
Tropical Cyclone Gita, Samoa, American Samoa, Tonga, Fiji and New Zealand
Date
February 7, 2018
Type
Flash flood, Landslide
Cause
Extreme rainfall

Locations

A - Matautu, Faatoia, Savaii, Afega and Malie (Samoa)
B - Faatoia (Samoa)
C - Savaii (Samoa)
D - Afega (Samoa)
E - Saleapaga (Samoa)
F - Solosolo (Samoa)
G - Pago Pago (American Samoa)
H - Tongatapu (Tonga)
I - ‘Eua (Tonga)
J - Ha’apai (Tonga)
K - Riwaka (New Zealand)
L - Tasman (New Zealand)
M - New Plymouth (New Zealand)
N - Takaka (New Zealand)

Magnitude

River level
Overflowing
Vaisigano River, Apia, Samoa - February 9 to February 11, 2018
Rainfall level
105 mm in 24 hours
Apia / Upolu Island, Samoa - February 10 to February 11, 2018
Ogimet figures
Rainfall level
204 mm in 24 hours
Le Piu Tai, Samoa - February 9 to February 10, 2018
Rainfall level
200.5 mm in 24 hours
Maota Int Airport, Samoa - February 9 to February 10, 2018
Rainfall level
402 mm in 24 hours
Mt Talu, Samoa - February 9 to February 10, 2018
Rainfall level
264 mm in 24 hours
Apia / Upolu Island, Samoa - February 9 to February 10, 2018
Rainfall level
212.5 mm in 24 hours
Le Piu Tai, Samoa - February 8 to February 9, 2018
Rainfall level
314 mm in 24 hours
Mt Talu, Samoa - February 8 to February 9, 2018
Rainfall level
647.5 mm in 24 hours
Le Piu Tai, Samoa - February 7 to February 8, 2018
Rainfall level
262.5 mm in 24 hours
Maota Int Airport, Samoa - February 7 to February 8, 2018
Rainfall level
627.5 mm in 24 hours
Maota Int Airport, Samoa - February 7 to February 8, 2018
Rainfall level
109 mm in 24 hours
Pago Pago, American Samoa - February 8 to February 9, 2018
Rainfall level
68.6 mm in 24 hours
Niuafoʻou, Tonga - February 10 to February 11, 2018
Rainfall level
80.6 mm in 24 hours
Wellington, New Zealand - February 20 to February 21, 2018
Note; Figure for New Zealand from MetService NZ for the duration of the storm, therefore possibly longer period than 24 hours.
Rainfall level
80.6 mm in 24 hours
Kelburn, New Zealand - February 20 to February 21, 2018
Rainfall level
69.2 mm in 24 hours
Christchurch Airport, New Zealand - February 20 to February 21, 2018
Rainfall level
96.6 mm in 24 hours
Le Bons Bay, New Zealand - February 20 to February 21, 2018
Rainfall level
60.2 mm in 24 hours
Dunedin Airport, New Zealand - February 20 to February 21, 2018
Rainfall level
296.5 mm in 24 hours
Hundalee Ranges south of Kaikoura, New Zealand - February 20 to February 21, 2018

Damages

Evacuated
244 people
Samoa - February 9 to February 12, 2018
Roads damaged
30 roads
Samoa - February 9 to February 12, 2018
Estimated figure. Numerous roads suffered flood and landslide damage, according to Samoa Land Transport Authority
Fatalities
1 person
Tonga - February 11 to February 13, 2018
Evacuated
3,900
Tonga - February 11 to February 13, 2018
Buildings destroyed
95 buildings
Tonga - February 11 to February 13, 2018
Much of the damage was a result of strong winds
Evacuated
200 people
Nelson-Tasman Region, New Zealand - February 20 to February 21, 2018