NASA satellite sees Tropical Storm Jelawat form in northwestern Pacific

Sep 21, 2012
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

As another tropical storm was forming in the northwestern Pacific Ocean, NASA's Terra satellite was providing forecasters at the Joint Typhoon Warning Center with visible and other data on the storm.

NASA's passed over Tropical Depression 18W before it strengthened into Jelawat late in the day on Sept. 20, in the Philippine Sea (part of the western North Pacific Ocean basin).

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 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 , such as that from the Atmospheric Infrared Sounder instrument that flies aboard NASA's Aqua 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 keeps the center of Jelawat at sea, while almost tracking parallel to the Philippines.

Explore further: Earthquake scientists go to Himalayas for seismic research

Related Stories

NASA sees Tropical Cyclone Quang develop an eye

Apr 30, 2015

Tropical Cyclone Quang strengthened during the early morning hours of April 30 (Eastern Daylight Time/U.S.) and developed an eye. The stronger Quang neared the coast of Western Australia and triggered warnings.

Two NASA views of newborn Tropical Cyclone Quang

Apr 29, 2015

The tropical low pressure area formerly known as System 98S has organized and developed into Tropical Cyclone Quang in the Southern Indian Ocean. NASA's Aqua satellite passed over Quang and gathered visible ...

Tropical Depression Haishen moves away from Fananu

Apr 06, 2015

Tropical Storm Haishen has weakened and moved farther away from the island of Fananu in the Northwestern Pacific Ocean. Before Haishen weakened from tropical storm status, NASA's Aqua satellite passed overhead ...

Recommended for you

Team reveals the first 'images' of thunder

11 hours ago

For the first time, scientists have imaged thunder, visually capturing the sound waves created by artificially triggered lightning. Researchers from Southwest Research Institute (SwRI) are presenting the ...

Yap Island typhoon warning in place for Noul

11 hours ago

Tropical Storm Noul is still threatening Yap Island located in the Caroline Islands of the western Pacific Ocean, and a part of the Federated States of Micronesia. Micronesia has posted a typhoon warning ...

NASA IMERG sees Australia's bicoastal rainfall

12 hours ago

The rainfall accumulation analysis above was computed from data generated by the Integrated Multi-satellite Retrievals for GPM (IMERG) during the period from April 28 to May 3, 2015. During this period IMERG ...

Remote assessment of avalanche risk

14 hours ago

In cooperation with a Swiss research team, geographers of Ludwig-Maximilians-Universitaet (LMU) in Munich have developed a novel measuring system relying on two different physical methods that promises to enhance forecasting ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.