Rare Southern U.S. Winter Storm; Dangerous Cold Weather For Much of the Eastern U.S.; Critical Fire Weather for Southern California

A rare winter storm impacting the Southern U.S. will move offshore Wednesday morning. Behind the storm, arctic air will continue encompassing the eastern two-thirds of the Nation with only a slow return to normal temperatures expected by the end of the week. Moderate to strong Santa Ana winds and low humidity will maintain Critical fire weather conditions in southern California into Thursday. Read More >

Thousands of geese have started their migration north making their way into South Dakota. As these birds fly over radar sites they can often be detected. One particular radar signature sometimes termed a “roost ring” was easily seen in radar images on March 16. A “roost ring” appears as birds leave their roost and fly into the air. The ring expands until birds begin dispersing and foraging.

The radar loop below shows a “roost ring” near the Cottonwood and Twin Lakes area in Spink County just south of Redfield. Another less distinguished “roost ring” can be seen near the Clark and Hamlin County borders. The radar loop starts at 1:44 PM CDT and ends at 2:40 PM CDT and the yellow circles highlight the two areas of interest.

Here's a more recent example, from March 2018.

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Rare Southern U.S. Winter Storm; Dangerous Cold Weather For Much of the Eastern U.S.; Critical Fire Weather for Southern California

NWS Doppler Radar Detects Geese Migration March 16th, 2009