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Category: Heavy rain / flooding

Significant flash flooding in the Milwaukee metro area — and 2 hikers injured by a lightning strike near Palmyra, Wisconsin

1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Infrared images (above) showed thunderstorms that produced very heavy rainfall — with 4 sites reporting over 11 inches across parts of the Milwaukee metro area (text list | radar-estimated rainfall) during the 12-hour period from early in the evening on 09 August into the early morning hours on 10 August 2025.... Read More

Tropical Convection to Bring Heavy Rainfall to Guam

It is mid to late July, and the western Pacific Ocean is starting to see its share of tropical activity. While Tropical Storm Francisco is spinning toward the Ryuku Islands of southwestern Japan, the people of Guam have their eyes on Invest 98W, an intensifying system closely approaching their island.... Read More

Mesoscale Convective Vortex migrates from southern Arizona to southeast California

5-minute PACUS Sector GOES-18 (GOES-West) daytime True Color RGB and Nighttime Microphysics RGB images created using Geo2Grid (above) revealed the cyclonic circulation of a Mesoscale Convective Vortex (MCV) that migrated west-northwestward across southern Arizona into southeast California (not far south of the California/Nevada border) during the 2-day period from 16 July to 18 July 2025. This MCV... Read More

American Samoa’s Wettest Year Gets Wetter

2025 has proven to be an atypically wet year for American Samoa. The cumulative precipitation chart backs that up: going back to 1 January, the total rainfall at Pago Pago has been the highest on record up to this date, and total rainfall is 70% higher than a normal year.July... Read More