NASA totals rainfall from destructive Tropical Cyclone Gita | 2/14/2018 | Staff
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Tropical Cyclone Gita dropped a lot of rain as it strengthened into a major hurricane in the South Pacific Ocean. NASA's IMERG calculated totals based on satellite observations that revealed over a foot (305 mm) of rain had fallen in various areas.

Tropical Cyclone Gita recently battered and drenched first Samoa and then Tonga as it passed close to both island groups. Gita was a tropical storm with winds of about 40 knots (46 mph) when it passed to the south of Samoa but still caused widespread destruction and flooding. The president of the United States approved a disaster declaration for Samoa.

Cyclone - Winds - Knots - Mph - Tonga

The tropical cyclone's winds had increased to about 125 knots (144 mph) when it battered Tonga as the equivalent of a category four hurricane on the Saffir-Simpson hurricane wind scale. Destructive winds were the main cause of destruction but heavy rains also drenched Tonga. Many structures were destroyed including Tonga's historic Parliament House.

This rainfall accumulation analysis was derived from NASA's Integrated Multi-satellitE Retrievals data (IMERG). IMERG data were used to calculate estimates of precipitation totals from a combination of space-borne passive microwave sensors, including the GMI microwave sensor on the GPM or Global Precipitation Measurement mission satellite, and geostationary IR (infrared) data. GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.

IMERG - Data - Benefits - Algorithms - NASA

IMERG data benefits from algorithms developed by NASA's Precipitation Measurement Missions (PMM) science team that supports GPM's Missions. An image created at NASA's Goddard Space Flight Center in Greenbelt, Md. showed IMERG rainfall accumulation estimates along Gita's track during the period from February 9 to 13, 2018 when the tropical cyclone was moving over the southern Pacific Ocean area east of the International Date Line. The IMERG...
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