Infrared data on Tropical Storm Emang's cloud top temperatures was captured by the Atmospheric Infrared Sounder (AIRS) instrument on Jan. 15 at 0823 UTC (3:23 a.m. EST). AIRS data showed that the largest area of powerful thunderstorms were in the northern half of the storm. That area showed cold cloud top temperatures of -63F (-52C) indicating high, powerful thunderstorms where the heaviest rain was falling.
NASA infrared data on Tropical Storm Emang captured by NASA's Aqua satellite on Jan. 15 at 0823 UTC (3:23 a.m. EST) showed that the largest area of powerful thunderstorms (purple) were in the northern half of the storm. That are is where heaviest rain was falling. Credit: NASA JPL, Ed Olsen
The AIRS data also showed that sinking air or subsidence was occurring in the southwestern quadrant of the storm, which is weakening the convection there.
AIRS data also showed that the low level center of circulation had become slightly elongated, stretching from southwest to northeast. For a tropical cyclone to intensify, its circulation centers from the surface to upper atmosphere basically have to stack up. When the center becomes elongated the storm usually has a difficult time intensifying.
On Jan. 15 at 0900 UTC, Tropical Storm Emang's maximum sustained winds were near 35 knots (40.2 mph/64.8 kph). Emang is moving slowly to the south-southwest at 4 knots (4.6 mph/7.4 kph). Emang was centered near 13.5 south latitude and 78.6 east longitude, about 525 nautical miles (604.2 miles/ 972.3 km) southeast of Diego Garcia. Diego Garcia is a coral atoll in the central southern Indian Ocean.
Forecasters at the Joint Typhoon Warning Center expect atmospheric conditions to improve over the coming days, so that Emang can organize and strengthen. Fortunately, the storm is no threat to land.Text Credit: Rob Gutro
Rob Gutro | EurekAlert!
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