NASA finds heavy rain potential in Tropical Storm Rita

November 26, 2019

NASA analyzed the cloud top temperatures in Tropical Storm Rita using infrared light to determine the strength of the storm. Rita has triggered warnings in the island nation of Vanuatu.

One of the ways NASA researches tropical cyclones is using infrared data that provides temperature information. Cloud top temperatures identify where the strongest storms are located. The stronger the storms, the higher they extend into the troposphere, and the colder the cloud top temperatures.

On Nov. 26 at 0224 UTC (Nov. 25 at 9:24 p.m. EST) NASA's Aqua satellite analyzed the storm using the Atmospheric Infrared Sounder or AIRS instrument. The AIRS imagery showed the strongest storms were southeast of the center. In those areas, AIRS found coldest cloud top temperatures as cold as or colder 210 Kelvin minus 81 degrees Fahrenheit (minus 63.1 degrees Celsius). NASA research has shown that cloud top temperatures that cold indicate strong storms that have the capability to create heavy rain.

Animated enhanced infrared satellite imagery shows that convection (rising air that forms the thunderstorms that make up a tropical cyclone) is rapidly decaying. That means that thunderstorms cannot form easily. The bulk of the clouds and showers are being pushed to the southeast of the low-level center of circulation by northwesterly winds.

Tropical cyclones do not always have uniform strength, and some sides have stronger sides than others, so knowing where the strongest sides of the storms are located helps forecasters. NASA then provides data to tropical cyclone meteorologists so they can incorporate it in their forecasts.

At 10 a.m. EST (1500 UTC), the Joint Typhoon Warning Center (JTWC) noted that Rita was located near latitude 14.4 degrees south and longitude 169.6 degrees east, about 212 nautical miles north-northeast of Port Vila, Vanuatu. Rita was moving to the south-southwest and had maximum sustained winds of 35 knots (40 mph/65 kph). Rita was moving to the southeast and away from the islands of Vanuatu.

The National Disaster Management Office (NDMO) advises that a Yellow Alert is in effect for people in Penama and Malampa provinces.  Strong to gale force winds may be expected to the east of Penama, Malampa and Shefa Provinces.

On Wednesday, Nov. 27, 2019, the Vanuatu Meteorology and Geo-Hazards Department (VMGD), Port Vila, Vanuatu, said, "Heavy rainfalls are expected over the eastern parts of Penama, Malampa and Shefa province tonight and continuing tomorrow. A Marine strong wind warning for all coastal waters is current. High Seas warning is also current for open waters of Vanuatu close to the system."

The JTWC expects Rita will dissipate over the next day.

Typhoons and hurricanes are the most powerful weather event on Earth. NASA's expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

The AIRS instrument is one of six instruments flying on board NASA's Aqua satellite, launched on May 4, 2002.

For updated forecasts from the VMGD website: http://www.vmgd.gov.vu
-end-


NASA/Goddard Space Flight Center

Related Tropical Cyclone Articles from Brightsurf:

NASA finds post-Tropical Cyclone Dolly exiting the tropical stage
NASA's Terra satellite provided a night-time look at what is now Post-Tropical Storm Dolly in the Northern Atlantic Ocean.

NASA find Herold a fading ex-tropical cyclone
Former Tropical Cyclone Herold is now a fading area of low-pressure in the Southern Indian Ocean and NASA's Aqua satellite provided forecasters with a visible image.

NASA sees Tropical Cyclone Herold's eye
NASA's Aqua satellite passed over the Southern Indian Ocean and captured an image of a well-developed Tropical Cyclone Herold at hurricane strength, east of Madagascar.

A new method to improve tropical cyclone intensity forecasts
There are many reasons for model errors in numerical weather forecasting of tropical cyclone intensity.

NASA catches the dissipation of Tropical Cyclone Claudia
Tropical Cyclone Claudia was dissipating in the Southern Indian Ocean when NASA's Terra satellite captured a visible image of storm as it flew overhead in its orbit around the Earth.

NASA finds tropical cyclone 02S consolidating
NASA's Aqua satellite captured an image of Tropical cyclone 02S and the visible image showed that the storm was getting better organized.

NASA finds Tropical Cyclone's Vayu getting stretched
When NASA's Aqua satellite passed over the Northern Indian Ocean, it captured an infrared image that revealed Tropical Cyclone Vayu was elongating.

NASA takes Tropical Cyclone's Vayu's temperature
NASA's Aqua satellite passed over the Northern Indian Ocean and took the temperature of Tropical Cyclone Vayu as it moved northward in the Arabian Sea.

NASA catches development of Tropical Cyclone 02A
Visible imagery from NASA's Terra satellite provided confirmation of the development of Tropical Cyclone 02A in the Arabian Sea, Northern Indian Ocean.

NASA goes infrared on powerful Tropical Cyclone Fani
NASA's Aqua satellite focused an infrared eye on a very powerful Tropical Cyclone Fani as it approached landfall in northeastern India.

Read More: Tropical Cyclone News and Tropical Cyclone Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.