Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

NASA satellites see Tropical Storm Irina getting loopy

06.03.2012
Two NASA satellites have been measuring rainfall and cloud top temperatures in Tropical Storm as it has been "going loopy" in the Mozambique Channel over the last couple of days.

Irina is making a cyclonic loop, something that a tropical cyclone does on occasion whenever there are a couple of weather systems that push it in different directions.


This image from NASA's TRMM satellite shows rainfall in the remnants of Tropical Cyclone Irina on March 5 at 2:23 a.m. local time/South Africa. Numerous intense storms in the southern and eastern quadrant were dropping rainfall at a rate of over 50mm per hr / ~2 inches (red). Light to moderate rainfall is depicted in blue and green was falling at a rate between .78 to 1.57 inches (20 to 40 mm) per hour. Credit: Credit: SSAI/NASA, Hal Pierce

On March 5, 2012, Irina's maximum sustained winds had increased to near 50 knots (57.5 mph/92.6 kph), , up from 40 knots (46 mph/74 kph) over the last several days. Forecasters at the Joint Typhoon Warning Center expect Irina to strengthen more at sea over the next day, and then begin to weaken.

CURRENT LOCATION

Irina is still centered at sea, and parallel to the middle of South Africa on March 5. Irina's center is about 315 nautical miles south-southeast of Maputo, Mozambique, and it was moving to the southeast, but is expected to start curving to the northeast and then northwest as it continues making a loop that will take it back toward a landfall in extreme northeastern South Africa.

What's making it loop? Weather systems in the area are pushing past Irina, acting as guides for the storm to follow. The last weather system that will turn it back to the north is a ridge (elongated area) of high pressure that's strengthening over South Africa will turn Irina to the northwest.

SATELLITE DATA

Infrared data from Atmospheric Infrared Sounder (AIRS) instrument on NASA's Aqua satellite showed on March 5, that most of the strongest thunderstorms and heaviest rainfall are occurring in the southern half of the storm. The strongest thunderstorms usually have the highest, and coldest cloud top temperatures, which is what AIRS infrared data reads. When cloud tops exceed the AIRS threshold of -63 Fahrenheit (-52.7 Celsius), the cloud tops are considered strong thunderstorms, and usually they have heavy rainfall. On the northern side of the storm, it's a different story, however, as sinking air on the northern side is preventing thunderstorm development.

NASA's Tropical Rainfall Measuring Mission (TRMM) satellite passed over Irina on March 5, 2012 at 0023 UTC (2:23 a.m. local time/South Africa / 7:23 p.m. EST on March 4, EST). A rainfall analysis from TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) instruments showed areas of heavy rainfall in several areas, mostly south of the center of circulation. Areas with heavy rain were spotted by the TRMM satellite in the southwestern and eastern quadrants of the storm, and rain was falling at a rate of over 50mm/hr (~2 inches).

LANDFALL

Cyclone Irina is now expected to make landfall in extreme northeastern South Africa, south of the Mozambique border late on March 9, but the forecast could again change as Irina has been slowed by various weather factors. There are several parks located near where landfall is currently forecast. Tembe Elephant Park and the Ndumo Game Reserve are located near the Mozambique border and the Isimangaliso Wetland Park is located to the south. These areas are likely to feel the strongest winds from Irina when it makes landfall.

As Irina nears landfall by the end of the week, cold waters stirred up from below the surface are causing sea surface temperatures near the coast to cool, which will reduce any energy going into Irina as it nears the coast for landfall. Once Irina makes landfall, the forecasters at the Joint Typhoon Warning center expect Irina to dissipate quickly. Meanwhile residents of eastern South Africa, Swaziland and southeastern Mozambique can expect more clouds, showers, gusty winds and rough surf in coastal areas as Irina loops back toward land.

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

More articles from Earth Sciences:

nachricht Multi-year submarine-canyon study challenges textbook theories about turbidity currents
12.12.2017 | Monterey Bay Aquarium Research Institute

nachricht How do megacities impact coastal seas? Searching for evidence in Chinese marginal seas
11.12.2017 | Leibniz-Institut für Ostseeforschung Warnemünde

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Plasmonic biosensors enable development of new easy-to-use health tests

14.12.2017 | Health and Medicine

New type of smart windows use liquid to switch from clear to reflective

14.12.2017 | Physics and Astronomy

BigH1 -- The key histone for male fertility

14.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>