The animation above shows ProbSevere LightningCast probabilities over the Island of Guam for 80 minutes near noon local time on 6 October 2022 (imagery taken from this RealEarth website). The animation above shows LightningCast probabilities increasing from 0110 UTC (when a 10% contour appears) through 0140 UTC and 0150 UTC (when a... Read More
JMA Himawari-8 Visible (0.64 µm) and Infrared Window (10.4 µm) images (above) showed the development of “island-effect” thunderstorms over Guam on 05 October 2022 — as mentioned in the NWS Guam Area Forecast Discussion, these storms produced 2-3 inches of rainfall over parts of western/central Guam (prompting the issuance of a Flood... Read More
Typhoon Merbok became a very strong extratropical storm as it moved through the Bering Sea on 15 – 16 September. The animation above shows the development (in the eastern third of the domain) of the tropical cyclone and, starting later in the day on 14 September, its subsequent interaction and... Read More
At the request of the National Weather Service forecast office in Guam (where the National Weather Service’s day begins), CIMSS is computing a small region of LightningCast Probabilities that uses Himawari-8 data. The Guam forecast office issues a lightning ‘advisory’ if lightning is possible or occurring within 20 mi of... Read More
