A NASA satellite rainfall product that incorporates data from satellites and observations found heavy rainfall occurring throughout Typhoon Chan-hom and the heaviest rainfall in the eyewall. Chan-hom is expected to bring rainfall to Japan on its track through the Northwestern Pacific Ocean.
Chan-hom’s Status on Sept. 18
At 5 a.m. EDT (0900 UTC), the center of Typhoon Chan-hom was located near latitude 26.2 degrees north and longitude 134.4 degrees east. It was centered 378 nautical miles east of Kadena Air Base, Okinawa Island, Japan, moving toward the northwest. Maximum sustained winds are near 65 knots (75 mph/120 kph) with higher gusts.
Estimating Chan-hom’s Rainfall Rates from Space
NASA’s Integrated Multi-satellitE Retrievals for GPM or IMERG, which is a NASA satellite rainfall product, estimated on Oct. 7 at 2 a.m. EDT (0600 UTC), Chan-hom was generating as much as 30 mm (1.18 inches) of rain per hour falling in the ragged eyewall that surrounds the eye. Rainfall throughout most of the storm was estimated as falling at a rate between 5 and 15 mm (0.2 to 0.6 inches) per hour. At the U.S. Naval Laboratory in Washington, D.C., the IMERG rainfall data was overlaid on infrared imagery from NOAA’s GOES-16 satellite to provide a full extent of the storm.
In addition to the rainfall calculation within the typhoon, animated enhanced infrared satellite imagery revealed a consolidating system with a ragged eye. Microwave imagery indicates