GPM overpass of Hurricane Erin.
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
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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
Date Last Updated
August 8th, 2025
Document Description

The Integrated Multi-satellitE Retrievals for the Global Precipitation Measurement (GPM) mission (IMERG) combines precipitation retrievals from all available low-orbit passive microwave (PMW) data, together with geosynchronous infrared (GEO-IR) providing baseline retrievals to compute merged global precipitation every half hour. The IMERG Early Run includes forward propagation of PMW data, while the Late Run also uses backward propagation. IMERG includes the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager/Sounder (SSMIS) constellation operated by the U.S.

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