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Hurricane Season 2009: Tropical Depression 27W (Western Pacific)
11.25.09
 
November 25, 2009

NASA's MODIS instrument captured a visible image of TD27W on Nov. 24 at 0451 UTC. > View larger image
NASA's MODIS instrument captured a visible image of TD27W on Nov. 24 at 0451 UTC. The image shows its clouds and rains already over the Minadanao region of the Philippines.
Credit: NASA/JTWC
Tropical Depression 27W's Remnants Crawling Across Mindanao

Tropical Depression 27W, known locally in the Philippines as "Urduja" is now slowly crawling out of Mindanao toward Celebes Sea. Urduja is a legendary warrior princess who is recognized as a heroine in Pangasinan, Philippines.

On November 25, the remnant clouds and rains of Tropical Depression 27W (TD27W) are centered 50 miles northeast of Surigao City, a mosaic of islands that lies at the rim of the Asian continental shelf. It is perched at the northeastern tip of Mindanao, a southern island in the Philippines.

The local Coast Guard reported 44 passenger and cargo vessels in the Visayas region of the Philippines were grounded as a result of TD27W's passage through the area. Rain has been the biggest problem as winds never made it to tropical storm strength.

TD27W's center is in between two high pressure areas, which accounts for its crawl. One high is located to the west, over the Philippine Sea and the other to the east over the South China Sea. TD27W is expected to dissipate over the Philippine Sea in the next day or two.

Text credit: Rob Gutro, NASA/Goddard Space Flight Center



November 24, 2009

NASA's MODIS instrument captured a visible image of TD27W on Nov. 24 at 0451 UTC. > View larger image
NASA's MODIS instrument captured a visible image of TD27W on Nov. 24 at 0451 UTC. The image shows its clouds and rains already over the Minadanao region of the Philippines.
Credit: NASA/JTWC
NASA Sees Short-lived Tropical Depression 27W Raining on Mindanao, the Philippines

Another tropical depression is bringing rains and gusty winds to the Philippines, but this time it is not in Luzon. NASA's Aqua satellite noticed early today, November 24, that Tropical Depression 27W (TD27W), called "Urduja" in the Philippines, is now bringing those conditions much farther south over Mindanao.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) posted storm signal number one for a large area of the Visayas. Those areas under the warning include: in Visayas: Bohol, Leyte Provinces, Camotes Island, Biliran, Eastern & Western Samar. In Mindanao the warning includes: Surigao Provinces, Agusan del Norte, Dinagat Island, Siargao Island and Camiguin.

On Tuesday, November 24, Tropical depression 27W was located approximately 35 nautical miles north of Mindanao located in the southern Philippines. It was near 10.0 North latitude and 125.8 East longitude. TD27W has maximum sustained winds near 23 mph. TD27W is moving westward near 8 mph.

Mindanao is the second largest and easternmost island in the Philippines. It is also one of the three island groups in the country, along with Luzon and Visayas. Mindanao is the second largest island in the country at 94,630 square kilometers, and is the eighth most populous island in the world. Because the island is mountainous, there is a concern about mudslides from heavy rains as Tropical Depression 27W passes. Mount Apo is located there and is the highest mountain in the country.

NASA's Aqua satellite flew over Tropical Depression 27W and captured a visible image of the storm on Nov. 24 at 0451 UTC (Nov. 23 at 11:51 p.m. ET). The image showed TD27W's clouds and rains were already over the Minadanao region.

Meanwhile, forecasters at the Joint Typhoon Warning Center, the organization that forecasts storms in the western Pacific, noted that "animated multispectral satellite imagery depicts a fully-exposed low-level circulation center with convection sheared 50 nautical miles to the north." An open center of circulation and sheared-off convection (that means the tops have been blown off thunderstorms from wind shear, weakening the storms) are bad news for keeping the storm together, which is good news for the residents of Mindanao, the Philippines.

Once TD27W passes over land today, the system will weaken more. Over the next couple of days, TD 27W is likely to dissipate as it tracks into the outer edge of Typhoon Nida.

Text credit: Rob Gutro, NASA/Goddard Space Flight Center