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NASA Sees Tropical Depression Noru

Fri, 09/09/2011 - 6:48am

NASA Sees Tropical Depression Noru 

NASA Sees Tropical Depression Noru
This infrared image of Tropical Storm Noru was taken from NASA's Aqua satellite AIRS instrument on Sept. 5 at 10:53 p.m. EDT. Courtesy of NASA/JPL, Ed Olsen
Infrared satellite imagery from NASA's Aqua satellite revealed that Tropical Depression Noru lost strength while transitioning into an extra-tropical storm in the western North Pacific Ocean. High pressure pushed Noru northward into the Sea of Okhotsk.

The Sea of Okhotsk covers 611,000 square miles, and borders eastern Russia. It is northwest of the Sea of Japan, where Tropical Depression Noru tracked through, and will likely be Noru's final resting place.

When Aqua passed over Tropical Storm Noru the Atmospheric Infrared Sounder (AIRS) instrument noticed warmer cloud top temperatures that the day before, indicating that the strength of the rapidly rising air that forms the thunderstorms within, was waning. On Sept. 5 at 10:53 p.m. EDT, the strongest thunderstorms in Noru were southeast of its center.

By Sept. 6 at 8 a.m. EDT, Noru's maximum sustained winds were near 30 knots (35 mph). It was located 425 nautical miles east of Misawa Air Base, Japan near 41.3N and 150.6E. It moved to the north at 19 knots.

As Noru continues north, the sea surface temperatures are not warm enough to support a tropical cyclone, which is a "warm core system," so the inner core cools and becomes a cold core system which makes it extra-tropical. Noru will continue its journey into the Sea of Okhotsk off the coast of Russia.

Rob Gutro, NASA's Goddard Space Flight Center, Greenbelt, MD.

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