https://phys.org/news/2018-08-asa-aqua-satellite-extra-tropical-cyclone.html

Infrared data provided cloud top temperatures. The coldest clouds were the strongest storms. NASA's Aqua satellite found two areas where cloud top temperatures were coldest and as cold as minus 50 degrees Fahrenheit (minus 45.5 degrees Celsius). One larger area was located in west central Japan and moving into the Sea of Japan. The second smaller area was located over east central Japan.

On Aug. 24 at 5 a.m. EDT (0900 UTC) the Joint Typhoon Warning Center issued the final bulletin on Extratropical Storm Cimaron. The storm had crossed central Japan and was emerging into the Sea of Japan. It was centered near 40.8 degrees north latitude and 137.7 degrees east longitude, about 161 miles west of Misawa, Japan. Cimaron was moving to the north-northeast and had maximum sustained winds near 45 knots (52 mph/83 kph).