Cyclone 24S now all grown up and renamed Tropical Storm Sean

Apr 23, 2010
The Atmospheric Infrared Sounder instrument on NASA's Aqua satellite captured this image of Tropical Storm Sean (formerly Cyclone 24S) on April 22 at 17:29 UTC (1:29 p.m. EDT). The infrared image showed some strong, high, cold thunderstorms (purple) around Sean's center. The orange depicts sea surface and land temperatures as warm as or warmer than 80 degrees Fahrenheit. Credit: NASA/JPL, Ed Olsen

Weather systems that become tropical cyclones go through a couple of names before they mature, just like people with nicknames. Such is the case with Cyclone 24S in the Southern Indian Ocean that was just renamed Tropical Storm Sean.

Weather systems that become go through a couple of names before they mature, just like people with nicknames. Such is the case with Cyclone 24S in the Southern Indian Ocean that was just renamed Tropical Storm Sean.

When a weather system develops it is given a weather system number to keep track of it. For example, Sean was "born" as System 91S on April 21 about 630 nautical miles north-northwest of Port Hedland, Australia. On April 22, System 91S strengthened and developed tropical cyclone characteristics but wasn't quite a tropical storm, so it was renamed as the twenty-fourth tropical cyclone in the , "Tropical Cyclone 24S." After strengthening further and reaching tropical storm status, it received a human name and became "Tropical Storm Sean." So, it went through two numbered nicknames to get its "grown-up name."

The Atmospheric Infrared Sounder (AIRS), instrument that flies aboard NASA's Aqua satellite from April 22 at 17:29 UTC (1:29 p.m. EDT) showed some strong, high, cold thunderstorms around Sean's center.

is false-colored and higher cloud tops of stronger storms are depicted in purple. Sean showed a circular area of high, strong thunderstorms around his center of circulation. Those highest thunderstorms are as cold as or colder than 220 Kelvin or minus 63 degrees Fahrenheit (F).

On Friday, April 23 at 1500 UTC (11 a.m. EDT) Tropical Storm Sean had near 45 knots (52 mph). It was about 475 nautical miles north of Learmonth, Australia, near 14.4 South and 113.3 East. It was moving southeast at 4 knots (5 mph).

Animated shows convective banding (that is, rapidly rising air that condenses and form thunderstorms) keeps wrapping into the low-level center of the storm, from both the south and east of the center. Forecasters at the Joint Typhoon Warning Center note that conditions are still good for further intensification over the next 12-24 hours, but then Sean will encounter vertical wind shear and begin weakening over the weekend.

Sean is a sea storm, and will not affect any land areas over the weekend.

Explore further: Image: Underwater structures of the Great Bahamas Bank

add to favorites email to friend print save as pdf

Related Stories

Imani on the weakening on weekend

Mar 26, 2010

This isn't a good weekend for keeping tropical cyclones alive, as Tropical Storm Omais is becoming extra-tropical in the northwestern Pacific Ocean and Tropical Storm Imani appears doomed over the weekend in the Southern ...

Tropical Storm Robyn nested away from land

Apr 05, 2010

Tropical Storm "Robyn" didn't have to fly south for the northern hemisphere winter, like the birds (Robins), it formed in the southern hemisphere this past weekend in the Southern Indian Ocean. Infrared satellite ...

NASA's Aqua Satellite sees a tight Tropical Storm 21S

Mar 23, 2010

The Southern Indian Ocean is still warm enough to enable tropical cyclones to form, and Tropical Cyclone 21S did just that today. NASA's Aqua satellite captured infrared and visible images of 21S and the infrared ...

Tropical Storm 23S born in Southern Indian Ocean

Apr 02, 2010

According to data from the Tropical Rainfall Measuring Mission, or TRMM satellite mostly light to moderate rain is falling in the latest tropical cyclone born in the waters of the Southern Indian Ocean. TRMM ...

NASA sees sixteenth South Pacific cyclone form

Feb 16, 2010

During the early morning hours on Tuesday, February 16, the sixteenth tropical cyclone formed in the South Pacific Ocean and NASA captured an infrared image of its cold clouds, watching as it strengthens.

Recommended for you

NASA's spaceborne carbon counter maps new details

2 hours ago

The first global maps of atmospheric carbon dioxide from NASA's new Orbiting Carbon Observatory-2 mission demonstrate its performance and promise, showing elevated carbon dioxide concentrations across the ...

Indonesia volcano erupts, injuring 4; 1 missing

3 hours ago

A volcano in eastern Indonesia erupted Friday, spewing towering clouds of hot ash into the air and leaving four hikers injured and one missing when they scrambled to safety, an official said.

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.