Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

NASA Satellites Show Towering Thunderstorms in Rare Sub-tropical Storm Arani

17.03.2011
NASA's Aqua and TRMM satellites are providing data to scientists about the Southern Atlantic Ocean Sub-tropical Storm Arani, a rare occurrence in the southern ocean. Rainfall data and cloud top temperatures revealed some heavy rain and strong thunderstorms exist in Arani as it continues to pull away from Brazil.

NOAA's Satellite and Information Service classified Arani as a T1 on the Dvorak intensity scale which would indicate an estimated wind speed of about 29 knots (~33 mph).


This 3-D view of Sub-tropical Storm Arani's clouds was created from data taken by NASA's TRMM satellite. It showed that there were very heavy thunderstorms (red) in the eastern half of the storm. TRMM's Precipitation Radar showed that some of these powerful storms were reaching to heights of over 14 km (~8.7 miles) above the surface of the Southern Atlantic Ocean.
Credit: NASA/SSAI, Hal Pierce

During the daytime on Tuesday, March 15 at 1820 UTC (2:20 p.m. EST) NASA's Tropical Rainfall Measuring Mission (TRMM) satellite flew over Sub-Tropical Storm Arani. TRMM rainfall data showed that the storm contained mostly moderate rainfall, falling at a rate between 20 and 40 millimeters (.89 to 1.57 inches) per hour. However, there were some areas of heavy rainfall in the north and eastern quadrants of the storm. The heavier rainfall was occurring at about 50 mm or 2 inches per hour. TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) data were used in the image above to show rainfall near Arani.

On Mar. 16 at 03:29 UTC (Mar. 15 at 11:29 p.m. EST) another of NASA's fleet of Earth science satellites flew over Sub-tropical Storm Arani and took its temperature. NASA's Aqua satellite captured an infrared image of Sub-Tropical Storm Arani's cold thunderstorm cloud tops in two areas of the storm. The Atmospheric Infrared Sounder (AIRS) instrument that flies aboard Aqua provided infrared readings of those cloud tops and showed that they were as cold as or colder than -63F/-52 C, and were areas of heavy rainfall. The strongest thunderstorms wrapped from the north, eastward to the south of the center of circulation, confirming the data from the TRMM satellite.

Later on March 16, at 10:52 UTC (6:52 a.m. EST), the TRMM satellite again passed over Sub-Tropical Storm Arani and noticed it still had some strong thunderstorms and was producing heavy rainfall off the Brazilian coast.

TRMM data was used to create a 3-D view of Sub-tropical Storm Arani's clouds, and it showed that there were very heavy thunderstorms in the eastern half of the storm. TRMM's Precipitation Radar showed that some of these powerful storms were reaching to heights of over 14 km (~8.7 miles) above the surface of the Southern Atlantic Ocean.

Arani has the appearance of a tropical cyclone but has been classified as a subtropical cyclone. Subtropical cyclones are low pressure areas that develop with a cold core and transition to a warm core in the mid-levels of the troposphere, resembling a tropical cyclone. They more typically form outside of hurricane season (which is June 1 to Nov. 30 in the Northern Atlantic, for example). They also have broad wind patterns and that means that their maximum sustained winds are usually located farther from the center than a tropical cyclone. They also have no weather fronts linked to them, such as a typical low pressure area that brings summertime storms with an associated cold front. Subtropical cyclones can sometimes become tropical cyclones, and occasionally, tropical cyclones can become subtropical.

Tropical cyclones are very rare in the Southern Atlantic Ocean. In 2004 a cyclone called Catarina formed in the South Atlantic and caused some controversy when it was classified as a hurricane by the United States' National Hurricane Center.

Arani is over the open waters of the Southern Atlantic and continues to move east-southeast and farther away from Brazil.

Text Credit: Rob Gutro/Hal Pierce, NASA's Goddard Space Flight Center, Greenbelt, Md.

Rob Gutro | EurekAlert!
Further information:
http://www.nasa.gov
http://www.nasa.gov/mission_pages/hurricanes/archives/2011/h2011_Arani.html

More articles from Earth Sciences:

nachricht New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland
19.01.2017 | University of Gothenburg

nachricht Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>