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In many places, the amount of that rain falls on a particular day or hour is influenced by multiple natural cycles that exist simultaneously on different time scales. One such cycle repeats every 24 hours, and another repeats every year. The global extent of these cycles can be studied using NASA's IMERG precipitation estimates that have been generated for 1998 to the present. Most of Earth's precipitation falls as rain, and the rest falls as snow, hail, or other forms of precipitation. The length of IMERG's data record makes it possible to average out some of the random error and unrelated

Several atmosphere rivers have recently carried plumes of moisture from the Tropics toward the United States. These plumes of water vapor have contributed to flood-producing storms over Washington State during the first three weeks of December 2025.

As Hurricane Melissa passed over Jamaica on Oct. 28, 2025, NASA’s IMERG algorithm provided near real-time estimates of rainfall using data from an international constellation of satellites united by the GPM Core Observatory. The below animation of IMERG precipitation rates and accumulations shows data from Oct. 23 through Oct. 29, revealing that central Jamaica received an estimated 18–24 inches of rain, much of it falling on the 28th. These satellite-based estimates were broadly consistent with the National Hurricane Center’s forecast, which anticipated 20–30 inches of rain due to the storm’s

After forming into a hurricane in the central Atlantic on the morning of Friday August 15 th, Hurricane Erin underwent a period of extremely rapid intensification as it was passing northeast of the Leeward Islands, becoming a powerful Category 5 storm and the most rapidly deepening hurricane in the Atlantic before the month of September. Last year in early October in the then Gulf of Mexico, Hurricane Milton became the fastest Atlantic storm to intensify from a tropical depression to a Category 5 storm. Erin originated from an African easterly wave that emerged off the coast of Africa on the 9

RAIN Global Viewer Regional Animations of IMERG in Near-realtime - Global Edition Visualize and animated near-realtime NASA IMERG satellite precipitation estimates. NOTE: This app is intended to be viewed on a large computer monitor. Click Here to view Fullscreen