Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

NASA sees Alenga become a cyclone in the Southern Indian Ocean

09.12.2011
NASA's Aqua satellite passed over Cyclone Alenga and captured a visible image of the rounded and more powerful storm is it makes its way toward Western Australia.

Alenga had grown from a tropical storm to a cyclone by 0300 UTC on Dec. 8 (10 p.m. EST, Dec. 7) when its maximum sustained winds reached 90 knots (103 mph/166 kmh).


On Dec. 8 at 7:10 UTC (2:10 a.m. EST), the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA's Aqua satellite captured a visible image of Cyclone Alenga when it passed overhead from space. Alenga appeared as a rounded area of compact clouds. Credit: NASA Goddard MODIS Rapid Response Team

On Dec. 8 at 7:10 UTC (2:10 a.m. EST), the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA's Aqua satellite captured a visible image of Cyclone Alenga when it passed overhead from space. Alenga appeared as a rounded area of compact clouds. Although an eye was not apparent on visible imagery, it was seen in earlier infrared imagery. At that time, Alenga's winds had decreased as a result of wind shear.

By 1500 UTC (10 a.m. EST) on Dec. 8, Alenga's maximum sustained winds were down to 80 knots (92 mph/148 kmh). Cyclone-force winds extended 25 miles (40 km) out from the center of the storm, while tropical storm-force winds extended out to 110 miles (177 km), making the storm at least 220 miles (354 km) in diameter. Alenga was about 400 nautical miles (460 miles/740 km) south-southeast of the Cocos Islands, near 18.9 South latitude and 99.6 East longitude. It was speeding to the east-southeast near 22 knots (25 mph/40 kmh). Infrared imagery at 1500 UTC no longer showed an eye, further indication that the storm was weakening.

In addition to facing higher wind shear, a field of cold air stratocumulus clouds to the west is moving into the low level circulation of the center, and cold air also weakens tropical cyclones. Alenga is also being stretched out from the wind shear, and the strongest convection (rising air that forms the thunderstorms that make up the tropical cyclone) is now starting to stretch to the southeast of the storm's center. Alenga now faces even a third challenge: dry air. Dry air is also starting to affect the western side of the storm by absorbing moisture and eroding the band of thunderstorms.

The Joint Typhoon Warning Center expects Alenga to begin transitioning to an extra-tropical storm later today. As it begins that transition, however, the cold and dry air and the increased wind shear will work in tandem with the cooler sea surface temperatures that lay ahead in Alenga's path to cause the storm to weaken quickly.

images: http://www.nasa.gov/mission_pages/hurricanes/archives/2011/h2011_Alenga.html

Rob Gutro | EurekAlert!
Further information:
http://www.nasa.gov

More articles from Earth Sciences:

nachricht Predicting unpredictability: Information theory offers new way to read ice cores
07.12.2016 | Santa Fe Institute

nachricht Sea ice hit record lows in November
07.12.2016 | University of Colorado at Boulder

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>