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Hurricane Season 2009: Tropical Depression 97W (Western Pacific)
11.03.09
 
November 3, 2009

This infrared image of 97W from NASA's Aqua satellite on November 3 revealed weakening convection. > View larger image
This infrared image of 97W from NASA's Aqua satellite at 1:30 a.m. local Asia/Manila Time, November 3 revealed weakening convection.
Credit: NASA JPL, Ed Olsen
Tropical Depression 97W Passing Through Central Philippines

Tropical Depression 97W hasn't grown into a tropical storm and is now tracking through the central Philippines, far south of Manila. The storm is weakening and is dissipating, and NASA's Aqua satellite verified that the thunderstorm cloud tops are not as cold as they were yesterday, indicating a weakening storm.

At 11 a.m. local (Asia/Manila) time on November 3, TD97W had maximum sustained winds near 30 knots (34 mph) and higher gusts. It was located 160 miles east of Manila, near 14.1 North and 123.7 East. The storm is kicking up 12-foot high waves.

NASA's Aqua satellite flew over 97W at 1:30 a.m. local Asia/Manila Time this morning, November 3. An infrared image from the Atmospheric Infrared Sounder (AIRS) instrument revealed warmer thunderstorm cloud tops, little or no convection (rapidly rising air that forms thunderstorms, and powers tropical cyclones).

Tropical Depression 97W (TD97W), named "Tino" in the Philippines, is forecast to move on a south-southwesterly track, over Tabaco City, Ligao, Oas, and Naga City into the Ragay Gulf. It will continue moving south-southwest through the Sibuyan Sea and into the Mindoro Strait, while bringing rains to areas that include the cities of Kalibo, Roxas City and San Jose de Buenavista.

The U.S. Navy's Joint Typhoon Warning Center (JTWC), the organization that forecasts tropical cyclones in that part of the world, noted in their discussion this morning, "Animated multi-spectral imagery shows an increasingly exposed low level circulation center (LLCC) with very little to no central convection. Over the past 12 hours, the deep convection has waned and the LLCC has steadily tracked southward with the low- to mid-level northeasterly flow associated with the cold surge coming off the Asian land mass."

Because of the lack of convection (thunderstorm formation) and a more disorganized center of circulation, the JWTC issued their final warning on the storm this morning.

Text credit: Rob Gutro, NASA's Goddard Space Flight Center



November 2, 2009

97W, showed clouds are already spreading over the northern Philippines. > View larger image
NASA's Aqua satellite captured this visible image of 97W, or "Tino" early this morning, November 2 at 12:23 a.m. EDT (1:23 p.m. local time) and showed 97W's clouds are already spreading over the northern Philippines.
Credit: NASA JPL, Ed Olsen
The infrared imagery is showing some high thunderstorms (purple) indicating some heavy rainfall and strong convection. > View larger image NASA's Aqua satellite AIRS instrument caught a new tropical depression that just formed in the Philippine Sea on November 2 at 0523 UTC (1:23 p.m. local time, Manila) and already on the fringe of the Philippines. The infrared imagery is showing some high thunderstorms (purple) indicating some heavy rainfall and strong convection.
Credit: NASA JPL, Ed Olsen
NASA Satellite Confirms Another Tropical Cyclone May Impact the Philippines

When NASA's Aqua satellite flew over the Philippine Sea during the early morning hours today, November 2 infrared imagery saw another new tropical cyclone coming together.

The U.S. Navy's Joint Typhoon Warning Center, the organization that forecasts tropical cyclones in that area of the world is getting a workout. Tropical Storm Mirinae just made landfall this morning in Vietnam, and had crossed northern Luzon, the Philippines this past weekend. Now, there's another threat in the region.

At 0600 UTC (4 p.m. local Asia/Manila time) on Monday, November 2, "System 97W" appeared to be taking on tropical cyclone characteristics. In fact, the Philippine Government hasn't waited for it to be named and gave it the local name "Tino." Tino, or 97W was located about 320 miles northeast of Manila, Philippines, near 18.0 North and 120.8 East. It was moving in a westerly direction toward the Philippines and the outer fringes of 97W's clouds are already moving into the northern areas of Luzon.

NASA Aqua satellite's Atmospheric Infrared Sounder (AIRS) instrument takes the temperature of the high thunderstorms within a tropical cyclone. Knowing the height of the cloud tops is important to forecasters because the higher the cloud tops, the stronger the thunderstorms. The infrared imagery also showed that the strongest thunderstorms were in the storm's southern and northeastern areas. Those cloud tops had temperatures colder than -63F. Typically, the northeastern quadrant of tropical cyclones pack the strongest winds, too.

The Philippines have already posted warnings for the system and are not taking any chances. Public storm warning signal 1 is raised in Batanes group of islands, Cagayan, Babuyan, Calayan islands, Apayao, Kalinga, Mt. Province, Ifugao, Isabela, Quirino and Northern Aurora.

Text credit: Rob Gutro, NASA's Goddard Space Flight Center