Infrared NASA imagery shows sinking air, elongation in Tropical Storm Emang

Jan 15, 2013
Infrared NASA imagery shows sinking air, elongation in Tropical Storm Emang
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: Credit: NASA JPL, Ed Olsen

The Atmospheric Infrared Sounder instrument that flies on NASA's Aqua satellite provides valuable data to tropical cyclone forecasters, and revealed sinking air, a small area of powerful thunderstorms, and a slightly elongated Tropical Storm Emang.

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.

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 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 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 in the central southern Indian Ocean.

Forecasters at the Joint expect atmospheric conditions to improve over the coming days, so that Emang can organize and strengthen. Fortunately, the storm is no threat to land.

Explore further: Interaction of Atlantic and Pacific oscillations caused 'false pause' in warming

add to favorites email to friend print save as pdf

Related Stories

NASA sees strength in newborn Tropical Cyclone Emang

Jan 14, 2013

Tropical Cyclone Emang developed in the Southern Indian Ocean on Sunday, Jan. 13 about 525 nautical miles east-southeast of Diego Garcia. At that time, infrared satellite imagery revealed that the low level ...

Infrared NASA imagery shows a weaker Tropical Storm 13W

Aug 07, 2012

Infrared satellite imagery from shows how cold cloud top temperatures are in a tropical cyclone, and recent imagery from NASA's Aqua satellite shows the cloud-top temperatures have been warming in Tropical ...

Recommended for you

Africa, from a CATS point of view

1 hour ago

From Saharan dust storms to icy clouds to smoke on the opposite side of the continent, the first image from NASA's newest cloud- and aerosol-measuring instrument provides a profile of the atmosphere above ...

Climate change may flatten famed surfing waves

Feb 25, 2015

On a summer day in 1885, three Hawaiian princes surfed at the mouth of the San Lorenzo River on crudely constructed boards made from coastal redwoods, bringing the sport to the North American mainland.

User comments : 0

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.