Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

NASA sees Tropical Storm Irina heading back toward African mainland

08.03.2012
Tropical Storm Irina continues to linger in the Mozambique Channel, and NASA satellite data revealed the strongest storms in the southern quadrant, and Irina is running into some dry air, which may help to weaken it as it moves back to the African mainland.

When NASA's Aqua satellite passed over Irina on March 7 at 1053 UTC (5:53 a.m. EST) it captured an infrared image of the storm's cloud top temperatures using the Atmospheric Infrared Sounder (AIRS) instrument. AIRS data showed that the coldest cloud top temperatures (colder than -63F/-52.7C) that included the bulk of the showers and strongest thunderstorms were still on the southern side of the storm, as they were on March 6.


When NASA's Aqua satellite passed over Irina on March 7 at 1053 UTC (5:53 a.m. EST) it captured an infrared image of the storm's cloud top temperatures using the Atmospheric Infrared Sounder (AIRS) instrument. AIRS data showed that the coldest (purple) cloud top temperatures (colder than -63F/-52.7C) that included the bulk of the showers and strongest thunderstorms were on the southern side of the storm. Credit: Credit: NASA/JPL, Ed Olsen

Infrared imagery revealed a "well-defined low-level circulation center with isolated deep convection flaring," according to the Joint Typhoon Warning Center (JTWC). The JTWC noted that data from the Advanced Microwave Sounding Unit (AMSU) instrument shows "weak deep convective (rising air that forms thunderstorms) banding [of thunderstorms] is limited to the southern quadrant (of the storm) and significant dry air is surrounding the low level center." Dry air can sap the moisture and strength from a tropical cyclone. The AMSU-A instrument is a 15-channel microwave sounder designed primarily to obtain temperature profiles in the upper atmosphere (especially the stratosphere) and provide a cloud-filtering capability for tropospheric temperature observations.

On March 7 at 1500 UTC (10 a.m. EST), Tropical Cyclone Irina had maximum sustained winds near 45 knots (~52 mph/83.3 kph). Irina had not changed in strength in 24 hours as it looped in the southern Mozambique Channel. Irina is now about 480 nautical miles (~552 miles/~889 km) east-southeast of Maputo, Mozambique. The center is near 29.4 South latitude and 39.1 East longitude. It is now crawling to the west-northwest at just 3 knots. Just 24 hours before, Irina was headed east-northeast.

The forecasters at the Joint Typhoon Warning Center stated that Irina is moving through cool sea surface temperatures near 25 Celsius/77 Fahrenheit (a tropical cyclone needs temperatures of 22.6C/80F to maintain strength) and moderate, westerly vertical wind shear." Cool waters and moderate-to-strong wind shear are two factors that weaken tropical cyclones.

Irina is now being steered by a low-level subtropical ridge (elongated area) of high pressure, south of the cyclone. That ridge is pushing Irina to the west. Irina is forecast to continue moving westward at sea over the next couple of days and continue to kick up high waves in the southern Mozambique Channel. Residents along the eastern coast of South Africa and Mozambique should keep an eye on the storm as it moves back in their direction over the next couple of days.

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

More articles from Earth Sciences:

nachricht Geochemists measure new composition of Earth’s mantle
17.09.2019 | Westfälische Wilhelms-Universität Münster

nachricht Low sea-ice cover in the Arctic
13.09.2019 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Happy hour for time-resolved crystallography

Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in the city have developed a new method to watch biomolecules at work. This method dramatically simplifies starting enzymatic reactions by mixing a cocktail of small amounts of liquids with protein crystals. Determination of the protein structures at different times after mixing can be assembled into a time-lapse sequence that shows the molecular foundations of biology.

The functions of biomolecules are determined by their motions and structural changes. Yet it is a formidable challenge to understand these dynamic motions.

Im Focus: Modular OLED light strips

At the International Symposium on Automotive Lighting 2019 (ISAL) in Darmstadt from September 23 to 25, 2019, the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, a provider of research and development services in the field of organic electronics, will present OLED light strips of any length with additional functionalities for the first time at booth no. 37.

Almost everyone is familiar with light strips for interior design. LED strips are available by the metre in DIY stores around the corner and are just as often...

Im Focus: Tomorrow´s coolants of choice

Scientists assess the potential of magnetic-cooling materials

Later during this century, around 2060, a paradigm shift in global energy consumption is expected: we will spend more energy for cooling than for heating....

Im Focus: The working of a molecular string phone

Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Potsdam (both in Germany) and the University of Toronto (Canada) have pieced together a detailed time-lapse movie revealing all the major steps during the catalytic cycle of an enzyme. Surprisingly, the communication between the protein units is accomplished via a water-network akin to a string telephone. This communication is aligned with a ‘breathing’ motion, that is the expansion and contraction of the protein.

This time-lapse sequence of structures reveals dynamic motions as a fundamental element in the molecular foundations of biology.

Im Focus: Milestones on the Way to the Nuclear Clock

Two research teams have succeeded simultaneously in measuring the long-sought Thorium nuclear transition, which enables extremely precise nuclear clocks. TU Wien (Vienna) is part of both teams.

If you want to build the most accurate clock in the world, you need something that "ticks" very fast and extremely precise. In an atomic clock, electrons are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Society 5.0: putting humans at the heart of digitalisation

10.09.2019 | Event News

Interspeech 2019 conference: Alexa and Siri in Graz

04.09.2019 | Event News

AI for Laser Technology Conference: optimizing the use of lasers with artificial intelligence

29.08.2019 | Event News

 
Latest News

Novel mechanism of electron scattering in graphene-like 2D materials

17.09.2019 | Materials Sciences

Novel anti-cancer nanomedicine for efficient chemotherapy

17.09.2019 | Health and Medicine

Fungicides as an underestimated hazard for freshwater organisms

17.09.2019 | Ecology, The Environment and Conservation

VideoLinks
Science & Research
Overview of more VideoLinks >>>