5-minute PACUS Sector GOES-18 (GOES-West) Visible images (above) showed the hazy signature of resuspended volcanic ash (remaining from the 1980 eruptions of Mount St. Helens) that was being lofted from the surface by strong east-southeast winds — which were gusting as high as 38-42 mph at nearby RAWS sites — and being... Read More
1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Visible and Infrared images (above) included time-matched (+/- 3 minutes) plots of SPC Storm Reports — which showed supercell thunderstorms that produced a south-to-north oriented swath of at least 12 tornadoes across central North Dakota on 14 September 2025. With this outbreak, a new record was set for the number of... Read More
The Great Lakes have a significant amount of thermal mass, meaning it takes a long time for them to cool down as the seasons change from summer to autumn. Often during this time of year, the air overlying the lakes is warmer than the lakes themselves. As water evaporates from... Read More
1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Visible and Infrared images (above) included time-matched (+/- 3 minutes) SPC Storm Reports — which showed discrete supercell thunderstorms that produced giant hail (as large as 4.00 inches in diameter in southwest Kansas at 2215 UTC and 2343 UTC, and 3.50 inches in diameter in the northeast Texas Panhandle... Read More
