CSPP Geosphere imagery, above, (link for the latest animation) shows extensive snowcover over Wisconsin in the wake of the season’s first large-scale snowfall on 19-20 December. WFO MKX shows reported accumulations below (from their weather story). Note that Lake Winnebago south of Green Bay is ice-covered, but various other lakes (Mendota/Monona, Green Lake, Lake Geneva) in Wisconsin... Read More

GOES-16 (GOES-East) Red Visible (0.64 µm) images (above) revealed the development of Horizontal Convective Roll (HCR) clouds — a signature often associated with blowing snow — across parts of North Dakota, South Dakota, Minnesota and Wisconsin on 4th December 2024. Strong northwesterly winds in the wake of an arctic cold front were... Read More

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) Clean Infrared Window (10.3 µm) images (above) showed a lake effect snow (LES) band that intensified over far eastern Lake Erie, shortly before moving inland across western New York after sunset on 30th November 2024. Intermittent lightning activity was seen immediately inland as the LES band moved across... Read More

Cold air over the Great Lakes (see the plot of 850-mb temperature from RAOB stations at 1200 UTC below; note the similarity in temperatures and wind speeds over the Great Lakes states) means Lake Effect Snow. The animation above (source) shows snow bands over western lower Michigan and also downwind... Read More