NASA's Aqua satellite captured an image when Giovanna's center was close to the capital city of Antananarivo, and NASA's TRMM satellite saw powerful towering thunderstorms around its center before it made landfall.
On Feb. 14, 2012, at 07:15 UTC (10:15 a.m. local time -- Madagascar/3:15 a.m. EST), the MODIS instrument on NASA's Terra Satellite captured this visible image of Cyclone Giovanna almost directly in the center of the island of Madagascar. Credit: NASA Goddard MODIS Rapid Response Team
According to BBC News, Giovanna made landfall near the eastern port city of Toamasina with winds gusting to 120 mph (194km). Giovanna brought heavy rain, and its strong winds flattened trees. Storm surges continue to pound coastal areas as Giovanna tracks over the fourth-largest island in the world. Rainfall totals are expected between 10 and 20 inches (250 to 500 mm), and may trigger landslides in higher elevations.
On February 14, 2012 at 07:15 UTC (10:15 a.m. local time - Madagascar/3:15 a.m. EST), the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA's Terra Satellite captured a visible image of Cyclone Giovanna almost directly in the center of the island of Madagascar. Giovanna had weakened as a result of its interaction with land, and its eye had "closed."
Five hours later on Feb. 14, around 1200 UTC (7 a.m. EST), Giovanna was still tracking over land and weakened significantly to a minimal tropical storm. Maximum sustained winds were near 35 knots (40.2 mph/65 kph) and it was located about 100 nautical miles west of Antananarivo, Madagascar, near 19.6 South and 44.7 East. Giovanna is moving west at 14 knots (16.1 mph/26 kph).
The capitol city of Antananarivo reported a maximum wind speed of 32 knots (10-minute average) (~37 mph/~59 kph) with higher gusts.
As Giovanna approached Madagascar on February 13, another NASA satellite called the Tropical Rainfall Measuring Mission satellite (TRMM) had a fairly good early morning view if it. At 0333 UTC on Feb. 13, rainfall rates were obtained from TRMM Microwave Imager (TMI) and were overlaid on a visible/infrared image from TRMM's Visible and InfraRed Scanner (VIRS) instrument at NASA's Goddard Space Flight Center in Greenbelt, Md. At that time, Giovanna was an intensifying category 4 tropical cyclone with wind speeds estimated at over 125 knots (~144 mph).
Tropical cyclone Giovanna was located in the Indian Ocean east-northeast of Madagascar when it was classified as a tropical storm on February 9, 2012. When the TRMM satellite flew over Giovanna on February 11 at 1200 UTC, it was rapidly becoming more powerful. On the 11th, Giovanna had intensified to a category 3 tropical cyclone on the Saffir-Simpson scale with wind speeds estimated at 100 knots (~115 mph). That TRMM pass showed that an eyewall replacement was occurring at that time. A small ring of strong convective storms was located around the center of the center eye and other powerful storms were seen in the replacement eye further out from Giovanna's center.
The data from the TRMM Precipitation Radar (PR) data were also used to create a 3-D image of the storm. This image, looking from east, shows the structure of Giovanna's double eye wall. TRMM PR data shows that the tallest storm towers reaching to heights of almost 15km (~9.3 miles) were on Giovanna's eastern side. The storm towers in Giovanna's center were reaching to about 11km (~6.8 miles).
Giovanna is now expected to move into the Mozambique Channel where the warm waters will allow it to quickly reorganize. Forecast models take the storm to the center of the channel and then curve it back to the southeast over the next couple of days.
Rob Gutro | EurekAlert!
Welcome Committee for Comets
19.07.2019 | Technische Universität Braunschweig
Sea level rise: West Antarctic ice collapse may be prevented by snowing ocean water onto it
18.07.2019 | Potsdam-Institut für Klimafolgenforschung
Adjusting the thermal conductivity of materials is one of the challenges nanoscience is currently facing. Together with colleagues from the Netherlands and Spain, researchers from the University of Basel have shown that the atomic vibrations that determine heat generation in nanowires can be controlled through the arrangement of atoms alone. The scientists will publish the results shortly in the journal Nano Letters.
In the electronics and computer industry, components are becoming ever smaller and more powerful. However, there are problems with the heat generation. It is...
Scientists have visualised the electronic structure in a microelectronic device for the first time, opening up opportunities for finely-tuned high performance electronic devices.
Physicists from the University of Warwick and the University of Washington have developed a technique to measure the energy and momentum of electrons in...
Scientists at the University Würzburg and University Hospital of Würzburg found that megakaryocytes act as “bouncers” and thus modulate bone marrow niche properties and cell migration dynamics. The study was published in July in the Journal “Haematologica”.
Hematopoiesis is the process of forming blood cells, which occurs predominantly in the bone marrow. The bone marrow produces all types of blood cells: red...
For some phenomena in quantum many-body physics several competing theories exist. But which of them describes a quantum phenomenon best? A team of researchers from the Technical University of Munich (TUM) and Harvard University in the United States has now successfully deployed artificial neural networks for image analysis of quantum systems.
Is that a dog or a cat? Such a classification is a prime example of machine learning: artificial neural networks can be trained to analyze images by looking...
An international research group led by scientists from the University of Bayreuth has produced a previously unknown material: Rhenium nitride pernitride. Thanks to combining properties that were previously considered incompatible, it looks set to become highly attractive for technological applications. Indeed, it is a super-hard metallic conductor that can withstand extremely high pressures like a diamond. A process now developed in Bayreuth opens up the possibility of producing rhenium nitride pernitride and other technologically interesting materials in sufficiently large quantity for their properties characterisation. The new findings are presented in "Nature Communications".
The possibility of finding a compound that was metallically conductive, super-hard, and ultra-incompressible was long considered unlikely in science. It was...
24.06.2019 | Event News
29.04.2019 | Event News
17.04.2019 | Event News
19.07.2019 | Physics and Astronomy
19.07.2019 | Physics and Astronomy
19.07.2019 | Earth Sciences