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!
Determining the Earth’s gravity field more accurately than ever before
13.06.2019 | Technische Universität Graz
The influence of the mosquito - Will malaria spread in Europe and the Mediterranean as a result of climate change?
06.06.2019 | Universität Augsburg
Light can be used not only to measure materials’ properties, but also to change them. Especially interesting are those cases in which the function of a material can be modified, such as its ability to conduct electricity or to store information in its magnetic state. A team led by Andrea Cavalleri from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg used terahertz frequency light pulses to transform a non-ferroelectric material into a ferroelectric one.
Ferroelectricity is a state in which the constituent lattice “looks” in one specific direction, forming a macroscopic electrical polarisation. The ability to...
Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
The Earth’s gravity fluctuates from place to place. Geodesists use this phenomenon to observe geodynamic and climatological processes. Using...
Discovery by Brazilian and US researchers could change the classification of two species, which appear more akin to jellyfish than was thought.
The tube anemone Isarachnanthus nocturnus is only 15 cm long but has the largest mitochondrial genome of any animal sequenced to date, with 80,923 base pairs....
Researchers at Chalmers University of Technology, Sweden, have discovered a completely new way of capturing, amplifying and linking light to matter at the nanolevel. Using a tiny box, built from stacked atomically thin material, they have succeeded in creating a type of feedback loop in which light and matter become one. The discovery, which was recently published in Nature Nanotechnology, opens up new possibilities in the world of nanophotonics.
Photonics is concerned with various means of using light. Fibre-optic communication is an example of photonics, as is the technology behind photodetectors and...
Fraunhofer IZM is joining the EUROPRACTICE IC Service platform. Together, the partners are making fan-out wafer level packaging (FOWLP) for electronic devices available and affordable even in small batches – and thus of interest to research institutes, universities, and SMEs. Costs can be significantly reduced by up to ten customers implementing individual fan-out wafer level packaging for their ICs or other components on a multi-project wafer. The target group includes any organization that does not produce in large quantities, but requires prototypes.
Research always means trying things out and daring to do new things. Research institutes, universities, and SMEs do not produce in large batches, but rather...
29.04.2019 | Event News
17.04.2019 | Event News
15.04.2019 | Event News
14.06.2019 | Information Technology
14.06.2019 | Materials Sciences
14.06.2019 | Medical Engineering