6,000 years ago, the Sahara desert was tropical—what happened?

As little as 6,000 years ago, the vast Sahara Desert was covered in grassland that received plenty of rainfall, but shifts in the world's weather patterns abruptly transformed the vegetated region into some of the driest ...

NASA satellite tracks Tropical Cyclone Lehar moving toward India

Tropical cyclone Lehar, located in the Bay of Bengal, continues to gain intensity while heading toward the same area of India where a much weaker tropical cyclone Helen recently came ashore. NASA's TRMM satellite passed over ...

NASA sees 'hot towers' in intensifying Typhoon Bopha

Bopha intensified into a typhoon today, Nov. 30, as it continues to affect the islands in Micronesia in the western North Pacific Ocean. NASA's TRMM satellite captured rainfall data of Bopha and noticed "Hot Tower" thunderstorms ...

Elusive El Nino challenges NOAA's 2012 US winter outlook

(Phys.org)—The western half of the continental U.S. and central and northern Alaska could be in for a warmer-than-average winter, while most of Florida might be colder-than-normal December through February, according to ...

La Nina caused global sea level drop

The 2011 La Niña was so strong that it caused global mean sea level to drop by 5 millimeters (0.2 inches), a new study shows. Since the early 1990s, sea level has been rising by about 3 millimeters (0.1 inches) per year, ...

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Tropical Rainfall Measuring Mission

The Tropical Rainfall Measuring Mission (TRMM) is a joint space mission between NASA and the Japan Aerospace Exploration Agency (JAXA) designed to monitor and study tropical rainfall. The term refers to both the mission itself and the satellite that the mission uses to collect data. TRMM is part of NASA's Mission to Planet Earth, a long-term, coordinated research effort to study the Earth as a global system. The satellite was launched on November 27, 1997 from the Tanegashima Space Center in Tanegashima, Japan.

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