The potent cyclone (surface analysis, an airmass RGB animation from the College of Dupage website is below) that caused severe weather over Hawaii (blog post) is also drenching the islands with considerable rains. The animation of MIMIC Total Precipitable Water, above, shows the storm drawing tropical moisture northward from the Intertropical Convergence Zone. The airmass RGB,... Read More

GOES-18 Upper Level water vapor infrared imagery, above, (source) shows a stream of upper-level moisture moving over southeastern Alaska on the east side of a cyclonic system over western Alaska on 27 January 2025. This large storm moved warm and moist air northward into Alaska; several stations tied record warm... Read More

Antonio B. Won Pat International Airport on Guam experienced a record wet 7 January this year when 3.32″ of rain fell, mostly between 1700 UTC/6 January and 0500 UTC/7 January. Himawari-9 Band 13 imagery, above, for the 3 days ending at 0000 UTC 08 January 2025, show a region of thunderstorms approaching the Marianas. A slower animation covering... Read More

The possibility of heavy rain over the Samoan islands led the Pacific Region to request 1-minute imagery over American Samoa, imagery that ended at 2107 UTC on 18 December when the domain was moved to cover the southwestern US (where a significant fire risk was occurring on 18 December). GREMLIN observations from 13-19 UTC on 18 December, shown below... Read More