Severe storms moved across the East Coast of the United States on June 19, 2025, bringing damaging winds, toppled trees, and power outages. The map above shows the half hourly IMERG Precipitation Rate overlaid on GOES-East Red Visible imagery. Press the "Play" button to view an animation of the storm moving across Virginia, Maryland, Washington, D.C., Delaware, Pennsylvania, New Jersey, and New York between 3:00 p.m. to 7:30 p.m. ET (19:00 to 23:30 UTC). Heavy rains are shown in shades of red.
The Integrated Multi-satellitE Retrievals for GPM (IMERG) algorithm uses passive-microwave observations from the Global Precipitation Measurement (GPM) constellation of satellites, infrared observations from geosynchronous satellites, and calibration data derived from rain gauges. IMERG “morphs” observations to earlier or later times using wind obtained from weather-model analyses.
The output field has 0.1 x 0.1 degree latitude-longitude resolution (approximately 11 by 11 km at the Equator). The grid covers the globe, although precipitation cannot always be estimated near the Poles. Within hours of observations being collected, the NASA Precipitation Processing System (PPS) provides Early IMERG estimates, while the higher-quality Final IMERG estimates are produced approximately four months later, once calibration datasets become available such as monthly rain-gauge analyses.
The latest imagery will be available approximately 5 hours prior to the current time and available in 30 minute increments from the 30-minute Early IMERG (GPM_3IMERGHHE) product. This is then replaced by the Final IMERG (GPM_3IMERGHH) data product when they become available.
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Referenced Datasets
GPM IMERG Early Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07 (GPM_3IMERGHHE) doi:10.5067/GPM/IMERG/3B-HH-E/07
GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07 (GPM_3IMERGHH) doi:10.5067/GPM/IMERG/3B-HH/07