NASA satellite sees wind shear whipping Tropical Cyclone Gillian

Mar 25, 2014
NASA's Aqua satellite captured this image of Gillian on March 25 at 06:30 UTC/2:30 a.m. EDT, now a tropical storm in the Southern Indian Ocean. Wind shear has pushed clouds and showers away from the center. Credit: NRL/NASA

A visible image from NASA's Aqua satellite provides a clear picture that wind shear is responsible for weakening the once mighty Tropical Cyclone Gillian from hurricane to tropical storm strength.

When NASA's Aqua satellite flew over Gillian on March 25 at 06:30 UTC/2:30 a.m. EDT, the Moderate Resolution Imaging Spectroradiometer or MODIS instrument took a visible picture of the storm. That image showed that wind shear has pushed clouds and showers away from the center as the storm weakened to a tropical storm.

In the MODIS image, the center of Gillian's circulation is surrounded by some cloudiness, while the bulk of clouds and showers has been pushed to the east-southeast from wind shear from the northwest.

On March 26 at 0900 UTC/5 a.m. EDT, Gillian's maximum sustained winds were near 60 knots. It was centered near 19.6 south latitude and 103.9 east longitude, about 594 nautical miles/683.6 miles/1,100 km west-northwest of Learmonth, Western Australia. Gillian was moving to the south at 6 knots/6.9 mph/11.1 kph.

The Joint Typhoon Warning Center or JTWC expects Gillian to weaken quickly today as it turns to the southwest in the open waters of the Southern Indian Ocean. The factors contributing to its rapid weakening include strong , subsidence or sinking air aloft, and movement into cooler sea surface temperatures.

JTWC forecasters expect Gillian to dissipate by March 26.

Explore further: NASA spots Tropical Cyclone Gillian's eye closing

add to favorites email to friend print save as pdf

Related Stories

NASA sees ex-Tropical Cyclone Gillian affect Indonesia

Mar 19, 2014

The remnants of former Tropical Cyclone Gillian moved out of the Southern Pacific Ocean and into the Indian Ocean only to trigger warnings and watches for part of Indonesia on March 19. NASA's Aqua satellite ...

Recommended for you

Tree rings and arroyos

17 hours ago

A new GSA Bulletin study uses tree rings to document arroyo evolution along the lower Rio Puerco and Chaco Wash in northern New Mexico, USA. By determining burial dates in tree rings from salt cedar and wi ...

NASA image: Agricultural fires in the Ukraine

19 hours ago

Numerous fires (marked with red dots) are burning in Eastern Europe, likely as a result of regional agricultural practices. The body of water at the lower left of this true-color Moderate Resolution Imaging ...

NASA marks Polo for a hurricane

19 hours ago

Hurricane Polo still appears rounded in imagery from NOAA's GOES-West satellite, but forecasters at the National Hurricane Center expect that to change.

User comments : 0