Samoa – Tropical Cyclone Gita Causes Landslides and Flooding

Days of heavy rainfall brought by Tropical Cyclone Gita have caused flooding and landslides in Samoa. The storm dumped massive amounts of rain from 07 to 11 February. Some areas recorded over 600 mm in a 24 hour period.

Strong winds from the storm also caused wind and coastal damage. In a statement of 10 February, the government of Samoa said that no injuries or deaths were reported. Around 250 people evacuated their homes and stayed in shelters during the storm.

Electricity, communications and water supply has been cut in some areas, mostly as a result of wind damage.

Samoa’s Land Transport Authority reported landslides had blocked roads in Solosolo and Saleapaga. Flood water blocked roads in several areas, including Matautu, Faatoia Apia, Savai’i and Afega, according to Land Transport Authority.

Floods in Samoa after Tropical Cyclone Gita in February 2018. Photo: Land Transport Authority
Floods in Samoa after Tropical Cyclone Gita in February 2018. Photo: Land Transport Authority
Floods in Samoa after Tropical Cyclone Gita in February 2018. Photo: Land Transport Authority

American Samoa

In neighbouring American Samoa, the storm also caused extensive damage to power, water and telecommunications. Homes have been damaged and and schools and businesses shut down. No fatalities have been reported. A state of emergency has been declared.

Tonga and Fiji

The EU’s Directorate-General for European Civil Protection and Humanitarian Aid Operations (ECHO) said that “GITA is forecast to pass near or over the islands of Eua (4,900 people) and Tongatapu (74,600 people, the most populous island of Tonga) on 12 February as an intense Tropical Cyclone with maximum sustained winds of 210-220 km/h. It is then forecast to pass south of Ona-I Lau island (Fiji) on 13 February. Very strong winds heavy rains and storm surge could affect these islands as well as Ha’apai and Vava’u group of Islands (Tonga).”

Global Disasters Alerts and Coordination System (GDACS) has issued a red alert for GITA in Tonga, as the cyclone can have a high humanitarian impact based on strong winds, affected population and their vulnerability.

The government of Tonga has declared a state of emergency. Evacuation centres have been set up in Tongatapu, Vava’u, Ha’apai and ‘Eua.

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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