Infrared NASA imagery shows some strength in Tropical Depression Sepat

Sep 30, 2013 by Rob Gutro
NASA's Aqua satellite passed over Sepat on Sept. 29 at 11:23 p.m. EDT and saw some cold cloud tops of thunderstorms (purple) near the center of circulation that were as cold as -63F/-52C. Credit: NASA/JPL

Tropical Depression Sepat formed in the northwestern Pacific Ocean and NASA's Aqua satellite captured infrared data on the storm, revealing some strong thunderstorms.

Tropical Depression Sepat, the twenty-first in the northwestern Pacific Ocean, formed on Sept. 30. NASA's Aqua satellite passed over Sepat on Sept. 30 at 03:23 UTC/Sept. 29 at 11:23 p.m. EDT. As Aqua passed overhead, that Atmospheric Infrared Sounder or AIRS instrument that flies aboard Aqua looked at the storm in infrared light. The AIRS data showed some cold cloud tops of thunderstorms near the center of circulation that were as cold as -63F/-52C indicating some strength in the system.

Satellite imagery also showed that the low-level center remained tightly wrapped, despite weak convective (rising air that forms the that make up a tropical cyclone) organization. Sepat, however is battling moderate wind shear and is expected to track over a pool of cooler waters north of the islands of Iwo To, Japan, which is expected to hinder its development.

On Sept. 30 at 1500 UTC/11 a.m. EDT Tropical Depression Sepat had maximum sustained winds near 30 knots/34.5 mph/55.5 kph. It was centered near 28.3 north and 143.3 east, about 485 nautical miles south-southeast of Yokosuka, Japan. It was moving to the northwest, but is expected to turn to the northeast. For additional information, visit the Joint Typhoon Warning Center website at: http://www.usno.navy.mil/JTWC/

The Joint Typhoon Warning Center or JTWC expects Sepat to briefly strengthen into a tropical storm on Oct. 1 before weakening again to a depression and becoming extra-tropical as it parallels Japan's east coast on a northeastern track. The JTWC expects Sepat's western edge to graze eastern coastal Japan as it moves into the northern reaches of the northwestern Pacific Ocean.

Explore further: Modeling storm surge to better protect Texas

Related Stories

NASA views a transitioning Tropical-Storm Pabuk

Sep 26, 2013

Typhoon Pabuk weakened and the core of the storm was changing from a warm core tropical system to a cold core low pressure system as it continued paralleling the coast of Japan on Sept. 26. NASA's Aqua satellite ...

NASA infrared imagery indicates Pewa weakened

Aug 23, 2013

Cloud top temperatures warmed up on NASA infrared imagery, indicating that the uplift in Tropical Storm Pewa was waning. By Aug. 23, Pewa was reduced to a tropical depression. Infrared imagery also showed ...

Recommended for you

Two NASA satellites see Tropical Storm Andres intensify

17 hours ago

The first tropical depression of the eastern Pacific Ocean hurricane season strengthened into tropical storm Andres. NASA's Aqua and Global Precipitation Measurement mission core satellite both provided information ...

Severe flooding hits central Texas, Oklahoma

21 hours ago

A stagnant upper-air pattern that spread numerous storms and heavy rains from central Texas up into Oklahoma has resulted in record flooding for parts of the Lone Star State. One of the hardest hit areas ...

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.