NASA satellite indicates Tropical Storm Prapiroon's rains mostly south of center

Oct 16, 2012
The TRMM satellite flew above Typhoon Prapiroon on Oct. 15, 2012 at 0632 UTC (2:32 a.m. EDT). Prapiroon's sustained wind speeds had dropped to 70 knots (~81 mph) with a large and ragged eye (black) being its dominant feature. TRMM's Microwave Imager (TMI) data indicated that the most intense rain bands south of Prapiroon's eye were dropping rain at a rate of about 30-40 mm/hour (~1.2 to 1.6 inches). Credit: NASA/SSAI Hal Pierce

Tropical Storm Prapiroon is still meandering in the western north Pacific Ocean, and NASA's TRMM satellite noticed that dry air and wind shear are adversely affecting rainfall north of the storm's center.

NASA's Measuring Mission (TRMM) satellite flew above Prapiroon when it was a typhoon on Oct. 15, 2012 at 0632 UTC (2:32 a.m. EDT). Prapiroon's sustained wind speeds had dropped to 70 knots (~81 mph) with a large and ragged eye being its dominant feature. TRMM's (TMI) data indicated that the most intense rain bands south of Prapiroon's eye were dropping rain at a rate of about 30-40 mm/hour (~1.2 to 1.6 inches).

The erosion of the rainfall was still happening in satellite imagery on Oct. 16, and the bulk of the showers were occurring south of the center. Dry air has also been affecting the north side of the storm, and dry air absorbs the moisture that helps create the clouds and thunderstorms that make up the storm. The bands of showers and thunderstorms in the southern quadrant, however, are still strong.

On Oct. 16, 2012 at 1500 UTC, Tropical Storm Prapiroon, known as "Nina" in the Philippines, had near 60 knots (69 mph/111 kph). It was located near 22.2 North latitude and 129.3 East longitude, about 260 nautical miles (299 miles/481.5 km) south-southeast of Kadena Air Base, Okinawa, Japan. It was still moving slowly, just 5 knots (5.7 mph/9.2 kph) to the west. Prapiroon is still meandering until a mid-latitude shortwave trough (elongated area of low pressure) moving into central China can push it to the northeast.

Prapiroon is not expected to strengthen before it begins moving to the northeast on Oct. 17. The Joint forecasts the storm to become extra-tropical thereafter.

Explore further: Canada to push Arctic claim in Europe

add to favorites email to friend print save as pdf

Related Stories

NASA eyes Typhoon Prapiroon intensifying

Oct 09, 2012

Typhoon Prapiroon is the twenty-second tropical cyclone of the western North Pacific Ocean, making for a very active season. NASA's Terra satellite passed over the storm as it was intensifying into a typhoon ...

NASA eyes Typhoon Prapiroon's U-turn

Oct 10, 2012

Typhoon Prapiroon is making a U-turn in the Philippine Sea, changing direction from northwest to northeast. NASA's Aqua satellite captured an image of the typhoon as it began turning. Visible satellite imagery ...

Recommended for you

NASA sees Tropical Storm Karina get a boost

13 hours ago

NASA's TRMM satellite saw Tropical Storm Karina get a boost on August 22 in the form of some moderate rainfall and towering thunderstorms in the center of the storm.

User comments : 0