NASA's Terra satellite passed over Tropical Depression 18W before it strengthened into Tropical Storm Jelawat late in the day on Sept. 20, in the Philippine Sea (part of the western North Pacific Ocean basin).
The MODIS instrument on NASA's Terra satellite captured this true-color image of Tropical Storm Jelawat on Sept. 20, 2012, at 01:50 UTC, before it had strengthened into a tropical storm. The Philippines is visible in the lower left corner.
Credit: NASA/Goddard/MODIS Rapid Response Team
On Sept. 20 at 01:50 UTC, as the depression was strengthening into a tropical storm, the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA's Terra satellite captured a true-color image of the storm. The MODIS image showed a rounded shape, which indicates good circulation. There was also a band of thunderstorms east of the center of circulation.
On Sept. 21, Tropical Storm Jelawat had maximum sustained winds near 45 knots (51.7 mph/83.3 kph). Jelawat was located about 535 nautical miles east-southeast of Manila, Philippines, near 12.4 north latitude and 129.7 east longitude. It was moving to the west-southwest at 7 knots (8 mph/13 kph).
Forecasters used infrared satellite imagery, such as that from the Atmospheric Infrared Sounder instrument that flies aboard NASA's Aqua satellite to determine the initial position of the tropical storm. Infrared data from Sept. 21, 2012, showed that the strongest convection and coldest cloud top temperatures were in the northwestern and southeastern quadrants of the tropical storm. Those areas were experiencing the heaviest rainfall.
By 10 p.m. local time in Manila, Philippines (10 a.m. Eastern Time/U.S.) on Sept. 21, Jelawat's center was about 311 miles (500 km) east of Catarman capital of Northern Samar, near 12.4 north latitude and 129.7 east longitude. Northern Samar is a Philippine province in the Eastern Visayas region.
The Philippine Atmospheric Geophysical and Astronomical Services Administration issued a bulletin about Jelawat (known locally as Lawin) on Sept. 21 that noted "Estimated rainfall amount is from 10 to 25 mm (0.4 to 0.9 inches) per hour within the 600 km (373 miles) diameter of the Tropical Storm. Fishing boats and other small seacrafts are advised not to venture out into the eastern seaboard of Southern Luzon, Visayas and Mindanao due to big waves generated by Tropical Storm (Jelawat) Lawin."
Jelawat is expected to track slowly west-northwestward over the weekend of Sept. 22 and 23 while the storm intensifies. The forecast track from the Joint Typhoon Warning Center keeps the center of Jelawat at sea, while almost tracking parallel to the Philippines.
Rob Gutro | EurekAlert!
Global study of world's beaches shows threat to protected areas
19.07.2018 | NASA/Goddard Space Flight Center
NSF-supported researchers to present new results on hurricanes and other extreme events
19.07.2018 | National Science Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences