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NASA: Songda becomes a super typhoon

27.05.2011
NASA's 3-D rotating satellite-view of Songda

As predicted, Typhoon Songda intensified and was a super typhoon with wind speeds estimated at over 130 knots ( ~145 mph) when NASA's TRMM satellite passed directly over head on May 26, 2011 at 0806 UTC (4:06 a.m. EDT).


Songda had a circular eye with extremely heavy rainfall, particularly in the southeast quadrant. The red areas represent heavy rainfall (falling at about 2 inches/50 mm per hour). The yellow and green areas are moderate rainfall, falling at a rate between .78 to 1.57 inches (20 to 40 mm) per hour. Credit: NASA/SSAI, Hal Pierce

The Tropical Rainfall Measuring Mission (TRMM) satellite captured the heavy rainfall rates within the super typhoon using TRMM's Visible and InfraRed Scanner (VIRS) instrument. The rainfall analysis from TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) data showed that Songda had a circular eye with extremely heavy rainfall (as much as 2 inches/50 mm per hour) particularly in the southeast quadrant. TRMM's PR instrument data showed the concentric rain bands typical of powerful typhoons.

Warnings are in effect in the Philippines today. Public storm warning signal no 1 is in effect in the following provinces: Luzon: Catanduanes, Camarines Sur & Norte, Quirino, Albay, Aurora, Quezon Provinces, Polilio Island, Cagayan and Isabela.

At 1500 UTC (11 a.m. EDT) on May 26, Super Typhoon Songda (called Chedeng in the Philippines) had maximum sustained winds near 140 knots (161 mph/259 kmh). Typhoon-strength winds extend 45 miles out from the center, while tropical storm-force winds extend 155 miles from the center, making Songda over 300 miles wide.

Songda's center was 250 miles east-northeast of Manila, near 16.2 North and 125.1 East. It was moving northwest near 8 knots (9 mph/15 kmh). Songda is creating very rough and dangerous seas in Philippine Sea, with wave heights reaching 38 feet (11.5 meters).

Songda has intensified in favorable conditions as the forecasters at the Joint Typhoon Warning Center predicted. Songda may have reached its peak intensity and is forecast to start turning to the northeast and weaken because of increased wind shear.

Songda will then start to veer northeast and weaken due to deteriorating atmospheric conditions.

Taiwan has already posted Marine Warnings for May 27 and 28, forecasting wave heights to increase from 2 meters (~6.5 feet) to as much as 6 meters (~20 feet) on east-facing shorelines as Super Typhoon Sondga moves past (it will stay off-shore and track to the east of Taiwan). The current track from the Joint Typhoon Warning Center takes Songda over the island of Kadena on May 28, and then skirting the east coast of Japan as it continues on a northeasterly track over the weekend.

Check out the 3-D rotating look at Super Typhoon Songda from NASA's TRMM satellite at: http://www.nasa.gov/mission_pages/hurricanes/archives/2011/h2011_Songda.html

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

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