NASA's satellite imagery sees Hilda hit a wall

Aug 27, 2009
The Atmospheric Infrared Sounder (AIRS) instrument on the Aqua satellite saw Hilda's cold clouds on Aug. 26 at 7:29 a.m.EDT and didn't see an eye or the hallmark "comma shape" of the storm, just a rounded area of thunderstorms that indicated she was losing her punch. Credit: NASA JPL, Ed Olsen

Two days ago, Hilda was in prime shape to strengthen further as she tracked westward, far south of the Hawaiian Islands. Today, as a result of winds and cooler waters, she's weakened to a tropical depression, and NASA satellites helped confirm that looking at her waning winds and thunderstorms.

The Atmospheric Infrared Sounder (AIRS) instrument on the Aqua observes Hilda's cold clouds, which is an indication of strength. The colder the thunderstorms, the higher and more powerful they are, but Hilda didn't show any. AIRS imagery also didn't see an eye or the hallmark "comma shape" of the storm, just a rounded area of thunderstorms that indicated she was losing her punch.

NASA's QuikScat satellite captured Tropical Depression Hilda's winds using its microwave imagery to peer through its clouds on Aug. 26 at 12:26 a.m. EDT). The strongest winds are represented in the center of circulation in the red area, which are about 34 mph. White barbs point to the few areas of heavy rain near Hilda's center. Credit: NASA JPL, Peter Falcon

NASA's QuikScat satellite also watched Hilda's winds slow from tropical storm to tropical depression-force today, August 27.

Like the Aqua satellite, every day, NASA's captures data from tropical cyclones. QuikScat reads the rotating surface wind speeds of tropical cyclones using its microwave imagery to peer through their clouds. QuikScat data are used to make images that show wind speeds in different colors and wind direction are indicated by small barbs. The highest speeds are normally shown in purple, which indicate winds over 40 knots (46 mph), but QuikScat today revealed that Hilda's highest winds in the center were only near 34 mph.

Hilda's sustained winds were near 34 mph, and fading because of the cooler waters she's moved into. Her center is located near 13.7 north and 152.5 west
She was moving west-southwest near 9 mph, and will continue tracking south of the Hawaiian Islands.

She's not expected to totally dissipate until Monday, August 31.

Source: NASA/Goddard Space Flight Center

Explore further: Bacteria play important role in long term storage of carbon in ocean

Related Stories

NASA satellites see remnant low Dolores go out kicking

Jul 17, 2009

The remaining clouds and showers that were once tropical storm Dolores are fading at sea, more than 940 miles west of Cabo San Lucas, Mexico. Dolores has now weakened into a remnant low pressure area but continues ...

Recommended for you

NASA image: Fires in Southeastern Australia

2 hours ago

The fires superimposed on the satellite image of southeastern Australia designated by red spots may be indicative of "planned burns" by the Victoria region. This map: http://www.depi.vic.gov.au/fire-and-emergencies/planned-burns/planned-burns-now-and-next-10-days found on the Department of the Environment and Primary Industries for the State of Victoria shows the burns th ...

NASA sees Maysak become a super typhoon

2 hours ago

NASA's Aqua satellite captured an image of Typhoon Maysak as it strengthened into a super typhoon on March 31, reaching Category 5 hurricane status on the Saffir-Simpson Wind Scale. The TRMM and GPM satellites, ...

A new tool to understand volcanic supereruptions

5 hours ago

To understand when and why volcanoes erupt, scientists study the rocks left behind by eruptions past. A method called geobarometry uses the composition of volcanic rocks to estimate the pressure and depth ...

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.