Nav: Home

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

April 23, 2010

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 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.

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 Southern Hemisphere, "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.

Infrared imagery 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 maximum sustained winds 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 infrared satellite imagery 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.
-end-
For information on all tropical cyclones, www.nasa.gov/hurricane

NASA/Goddard Space Flight Center

Related Tropical Storm Articles:

Tropical Storm Krosa gets a comma shape
Tropical Storm Krosa continued on its journey northward in the Northwestern Pacific Ocean when NOAA's NOAA-20 polar orbiting satellite passed overhead and captured a visible image of the strengthening storm in a classic tropical cyclone shape.
Satellite shows Tropical Storm Flossie holding up
Satellite imagery showed that Tropical Storm Flossie's structure didn't change much overnight from July 31 to August 1.
NASA tropical storm Erick strengthening
Infrared imagery from NASA's Aqua satellite revealed a stronger Tropical Storm Erick in the Eastern Pacific Ocean.
GPM satellite provides a 3D look at Tropical Storm Barry
The Global Precipitation Measurement mission or GPM core satellite provided a couple of views of Tropical Storm Barry that showed its cloud heights and rainfall rates.
NASA looks at Tropical Storm Funani's rainfall
Tropical Storm Funani (formerly classified as 12S) continued to affect Rodrigues Island in the South Pacific Ocean when the GPM satellite passed overhead and analyzed its rainfall.
NASA sees Tropical Storm Man-yi approaching typhoon strength Tropical Storm Man-Yi con
Tropical Storm Man-Yi continued to strengthen in the Northwestern Pacific Ocean as NASA-NOAA's Suomi NPP satellite provided a visible image of the storm.
NASA finds Nadine a compact tropical storm
NASA's Aqua satellite provided a visible image of Tropical Storm Nadine in the Eastern Atlantic that revealed it was a compact storm.
NASA gets tropical storm Leslie by the tail
What appears to be a long tail in satellite imagery of Tropical Storm Leslie is in fact clouds associated with a nearby elongated area of low pressure, or a trough.
NASA gets an infrared view of Tropical Storm Hector
Infrared data from NASA's Aqua satellite provided forecasters with temperature data that showed the storm had two areas of strong convection.
Tropical Storm Jongdari gearing up to become a Typhoon
NOAA/NASA's Suomi NPP satellite provided a visible look at Tropical Storm Jongdari in the Northwestern Pacific Ocean on July 26.
More Tropical Storm News and Tropical Storm Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Rethinking Anger
Anger is universal and complex: it can be quiet, festering, justified, vengeful, and destructive. This hour, TED speakers explore the many sides of anger, why we need it, and who's allowed to feel it. Guests include psychologists Ryan Martin and Russell Kolts, writer Soraya Chemaly, former talk radio host Lisa Fritsch, and business professor Dan Moshavi.
Now Playing: Science for the People

#538 Nobels and Astrophysics
This week we start with this year's physics Nobel Prize awarded to Jim Peebles, Michel Mayor, and Didier Queloz and finish with a discussion of the Nobel Prizes as a way to award and highlight important science. Are they still relevant? When science breakthroughs are built on the backs of hundreds -- and sometimes thousands -- of people's hard work, how do you pick just three to highlight? Join host Rachelle Saunders and astrophysicist, author, and science communicator Ethan Siegel for their chat about astrophysics and Nobel Prizes.