January 31, 2012
NASA Sees Strong Thunderstorms Surrounding Cyclone Iggy’s Center
NASA's Aqua satellite passed over Tropical Cyclone Iggy on January 31 and the AIRS infrared instrument aboard showed that there is a large area of strong thunderstorms still surrounding Iggy's center of circulation.
The Atmospheric Infrared Sounder Instrument called AIRS that flies aboard NASA's Aqua satellite captures infrared data and basically takes the temperature of cloud tops in tropical cyclones. That's a critical component of a tropical cyclone because the colder the cloud top, the stronger the uplift and energy in the storm. The threshold that indicates strongest thunderstorms and highest cloud tops is -63 Fahrenheit (-52.7 Celsius) in AIRS data, and cloud tops around Iggy's center were colder than that. That means there is still a lot of strength in the storm. AIRS data also shows there are tight bands of thunderstorms that are wrapping into the center of the storm. Microwave data from NASA's Aqua satellite showed an eye in the storm, despite its status as a tropical storm.
Iggy has begun moving to the south-southwest, and is expected to curve back later southeast towards southwestern Australia. Current forecasts expect Iggy to weaken as it runs into strong wind shear and cooler waters. Iggy may dissipate before making landfall.
Image Caption: AIRS captured infrared images and cloud temperatures of Tropical Cyclone Iggy on Jan. 31 at 0623 UTC (1:23 a.m. EST). Purple areas indicate the coldest cloud tops and strongest thunderstorms. Most of the strong thunderstorms surround the center of circulation. Credit: NASA/JPL, Ed Olsen
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