NASA's two eyes on Tropical Cyclone Daya

February 11, 2016
NASA's Aqua satellite captured a visible image of Tropical Cyclone Daya in the Indian Ocean on Feb. 11 at 0950 UTC (4:50 a.m. EST). Credit: NASA MODIS Rapid Response Team

Two of NASA's "eyes" have been watching Tropical Cyclone Daya and providing data to forecasters. As Tropical Cyclone Daya continued to move away from La Reunion Island in the Southern Indian Ocean, NASA's RapidScat instrument and NASA's Aqua satellite gathered visible imagery and infrared temperature data on the developing storm that showed its strength and development.

On Feb. 10 at 2300 UTC (6 p.m. EST) the RapidScat instrument that flies aboard the International Space Station measured the surface winds within Tropical Cyclone Daya. RapidScat saw strongest winds were in the eastern and southeastern quadrants of the storm, as high as 27 meters per second (60.4 mph/97.2 kph). Sustained winds around the rest of the circulation were less strong.

RapidScat is an important tool for meteorologists, because maximum sustained winds are not always equally distributed in a storm. RapidScat shows forecasters the location of the strongest winds in different quadrants of a storm, indicating locations facing greatest impacts.

On Feb. 10 the Atmospheric Infrared Sounder (AIRS) instrument aboard Aqua saw cloud top temperatures exceeding -63 degrees Fahrenheit (-53 degrees Celsius) south of the center of circulation. On Feb. 11, AIRS data showed cloud top temperatures that cold had expanded in area to the southern and western quadrants of the storm, where the most powerful thunderstorms were located.

On Feb. 10 at 6 p.m. EST RapidScat measured Daya's strongest winds as high as 27 meters per second (60.4 mph/97.2 kph) in the eastern and southeastern quadrants. Credit: NASA JPL/Doug Tyler

Another instrument aboard Aqua satellite captured a visible image of Tropical Cyclone Daya on Feb. 11 at 0950 UTC (4:50 a.m. EST). The Moderate Resolution Imaging Spectroradiometer or MODIS instrument's visible image confirmed with the AIRS infrared data showed: the most powerful thunderstorms were south and southwest of the center.At 1500 UTC (10 a.m. EST), Tropical cyclone Daya, formerly Tropical Cyclone 10S, was situated between La Reunion Island to the northeast and Madagascar to the west. It was near 26.5 degrees south latitude and 54.9 degrees east longitude, about 361 nautical miles south of La Reunion Island. Daya's were near 45 knots (49.7 mph/80 kph) and it was moving away from land areas to the southeast at 12 knots (13.8 mph/22.2 kph).

Daya is expected to start to weaken after today as it continues to encounter increasing vertical wind shear, according to the Joint Typhoon Warning Center. It is expected to dissipate in a day or two.

Explore further: NASA's RapidScat spots newborn Tropical Cyclone Tatiana

Related Stories

NASA sees Tropical Storm 10S form

February 10, 2016

Tropical Storm 10S developed as NASA's Terra satellite passed over the Southern Indian Ocean. The tropical storm developed from tropical low pressure area 96S between Madagascar and La Reunion Island.

NASA sees wide-eyed Tropical Cyclone Victor

January 19, 2016

NASA satellites and instruments have been monitoring Tropical Cyclone Victor, a hurricane in the South Pacific Ocean with a large eye. NASA's Aqua satellite, NASA-NOAA's Suomi NPP satellite and the RapidScat instrument aboard ...

NASA analyzes Tropical Storm Ula's winds

January 7, 2016

Tropical Storm Ula continued to weaken as it pulled farther away from Fiji in the Southern Pacific Ocean. NASA's RapidScat instrument found that the strongest winds in the storm were south of the center. NOAA's GOES-West ...

NASA data reveals tropical cyclone forming near Madagascar

February 9, 2016

The Global Precipitation Measurement or GPM core satellite and NASA's RapidScat instrument aboard the International Space Station have provided forecasters with data that shows System 96S, a tropical low pressure area in ...

Recommended for you

Hot spot at Hawaii? Not so fast

August 18, 2017

Through analysis of volcanic tracks, Rice University geophysicists have concluded that hot spots like those that formed the Hawaiian Islands aren't moving as fast as recently thought.

Supervolcanoes: A key to America's electric future?

August 16, 2017

Most of the lithium used to make the lithium-ion batteries that power modern electronics comes from Australia and Chile. But Stanford scientists say there are large deposits in sources right here in America: supervolcanoes.

Greenland ice flow likely to speed up

August 16, 2017

Flow of the Greenland Ice Sheet is likely to speed up in the future, despite a recent slowdown, because its outlet glaciers slide over wet sediment, not hard rock, new research based on seismic surveys has confirmed. This ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.