Ophelia was a very powerful category four hurricane on the Saffir-Simpson scale with winds of over 115 kts (~132 mph) when TRMM passed over head on 2 October 2011 at 0049 UTC. The Infrared image from that orbit shows that Ophelia had a small clear eye as it was passing well to the east of Bermuda. TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) data revealed that heavy rainfall was located in the northern side of the eye wall.

The Philippines is still reeling from the devastation caused by typhoon Nesat as another typhoon called Nalgae approaches from the east. Nalgae formed on 27 October 2011 near the same area of the western Pacific Ocean where Nesat originated. The TRMM satellite had a daylight look at Nalgae (known as Quiel in the Philippines) on 30 September 2011 at 0653 UTC. TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) data shows heavy rainfall near Nalgae's eye. The total area of rainfall isn't as extensive as it was with typhoon Nesat at this distance from the Philippines. Click here to see a

The TRMM satellite saw tropical storm Ophelia on 29 September 2011 at 2008 UTC ( 4:08 PM EDT) shortly before the storm was upgraded to a hurricane by the National Hurricane Center (NHC). An analysis of rainfall from TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) data shows that Ophelia was developing an eye with powerful thunderstorms located in the northwestern side of the forming eye wall. On Friday 30 October 2011 Ophelia further intensified to become a powerful category three hurricane on the Saffir-Simpson scale with winds of 100kts (~115 mph). The NHC has predicted that this

The TRMM satellite passed directly over typhoon Nesat as it was approaching southern Asia on 28 September 2011 at 1653 UTC. The rainfall analyis on the right was derived from that TRMM pass and shows that Nesat had large bands of rainfall containing extremely intense thunderstorms. Nesat has battered Hong Kong and Hainan and is expected to drench northern Vietnam.

Powerful typhoon Nesat (known locally as Pedring) came ashore in the Philippines on Tuesday September 27, 2011 causing the deaths of at least 33 people. Nesat was classified as a category three typhoon on the Saffir-Simpson scale with winds of 105 knots (~121 mph) before hitting the island of Luzon. The rainfall analysis above is the result of a TRMM-calibrated merged global Multi-satellite Precipitation Analysis (MPA) performed at Goddard Space Flight Center (GSFC). These MPA rainfall total estimates were for the period from 24-29 September 2011. This analysis indicates that the highest

The TRMM satellite passed above two tropical cyclones in the Atlantic Ocean early today. Tropical storm Philippe was seen at 0358 UTC (12:58 PM EDT 26 September 2011) and the regenerating remnants of tropical storm Ophelia were observed at 0529 UTC ( 1:29 AM EDT). TRMM's Precipitation Radar (PR) data were used in these images above to show the vertical structure of both storms. The image above used PR data to show that powerful thunderstorm towers were reaching to heights of over 15km (~9.3 miles) in the center of the increasingly better organized Ophelia remnants. Tropical storm Philippe on

A beta-version of the GPM Combined Algorithm code was released this week for the purpose of internal testing by team members. The GPM Combined Algorithm is developed to integrate sensor information from the two instruments onboard the GPM Core Observatory: the Dual-frequency Precipitation Radar (DPR) and the GPM Microwave Imager (GMI). The sophisticated software program combines raw data from each of the instruments to provide more comprehensive estimates of precipitation rate, water content profile, and drop distribution; that is, the software is important for translating what the instruments

The Philippines have already felt the effects of two typhoons and two tropical storms this year. The TRMM satellite had an excellent early evening view of another typhoon called Nesat on 26 September 2011 at 0856 UTC that is moving toward the Philippines. Typhoon Nesat formed in the Pacific Ocean east of the Philippines 23 September 2011 Nesat is predicted to hit the Philippines within 24 hours as a powerful category two typhoon with wind speeds of about 90 kts (~103.5 mph). The image above shows a rainfall analysis derived from TRMM'S Microwave Imager (TMI) and Precipitation Radar (PR). Those

Typhoon Roke, which made landfall as a Category 1 typhoon along the southeast coast of Honshu near the city of Hamamatsu (about 200 km southwest of Tokyo), was responsible for bringing heavy rains and flooding to most of Japan. Heavy rains actually began effecting parts of southern Japan well before the cyclone neared the coast as tropical moisture from Roke streamed northward into a stalled out frontal boundary that was draped across southern Japan. Japan is also very mountainous, which can enhance the effect. The Tropical Rainfall Measuring Mission or TRMM satellite is used to measure

Roke, a once powerful Category 4 typhoon with sustained winds estimated at 115 knots (~132 mph), came ashore in central Japan Wednesday around 2 pm local time near Hamamatsu on the southeast coast of Honshu (about 200 km southwest of Tokyo) as a Category 1 typhoon. Roke began as a tropical depression ten days ago in the central Philippine Sea about 850 miles (~1370 km) south of Japan. For over a week, the cyclone meandered south of Japan with little change in intensity. Roke finally began to intensify on the 19th of September when it became a typhoon just east of the Ryukyu Islands and then