Typhoon Ragasa

Typhoon Ragasa made landfall along the coast of Hailing Island in Yangjiang, China on September 24, 2025, around 5p.m. local time (5a.m. ET, September 25) with maximum gusts of 241 kph (89mph) and brought fierce winds and heavy rains to the region, including Hong Kong and Macau. The brightness temperature image above from the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard joint NASA/NOAA NOAA-20 and NOAA-21 platform, clearly shows the swirling clouds of the typhoon in shades of dark purple.

The image above shows the IMERG Precipitation Rate overlaid on a corrected reflectance image from the VIIRS instrument aboard the NOAA-21 platform. Heavy rains, falling at a rate of around 36mm/hour, are shown in dark red. 

The 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. 

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