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Cyclone Haley’s Demise Shown On Infrared NASA Image

February 12, 2013
Image Caption: AIRS data showed that cloud top temperatures had warmed since the previous day, indicating that cloud tops were not as high as they were on Feb. 9. AIRS data also showed that the strongest convection was disorganized and scattered. Credit: NASA JPL, Ed Olsen

NASA

NASA’s Aqua satellite captured an infrared image of Cyclone Haley as it was falling apart in the southern Pacific Ocean.

When NASA’s Aqua satellite passed over Cyclone Haley on Feb. 10 at 2347 UTC (6:47 p.m. EST) the Atmospheric Infrared Sounder (AIRS) instrument aboard captured an image of cloud top temperatures in the diminishing cyclone.

AIRS data showed that cloud top temperatures had warmed since the previous day, indicating that cloud tops were not as high as they were on Feb. 9. Falling cloud top heights indicate less uplift in the atmosphere to push clouds higher in the troposphere, and weaker storms. AIRS data also showed that the strongest convection (the rising air that form the thunderstorms that make up the tropical cyclone) was disorganized and scattered.

On Feb. 11 at 0300 UTC, the Joint Typhoon Warning Center issued its final advisory on Tropical Cyclone Haley. At that time, Haley’s center was located near 24.8 south latitude and 150.0 west longitude, about 500 nautical miles (575.4 miles/926 km) southeast of Bora Bora, Society Islands. Haley was moving to the southeast at 11 knots (12.6 mph/20.3 kph). As a result of wind shear and cooler sea surface temperatures, Haley’s maximum sustained winds had already dropped to 35 knots (40.2 mph/64.8 kph). Haley’s remnants were dissipating on Feb. 12 over open waters of the south Pacific Ocean.

AIRS provides infrared imagery of tropical cyclones, land and sea surface temperatures to forecasters. The Joint Typhoon Warning Center is the organization that forecasts tropical cyclones in the Southern Indian Ocean and has been utilizing the AIRS data.

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Source: Rob Gutro, NASA's Goddard Space Flight Center



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