From NWS
1993: A major winter storm struck Iowa on February 20-21. On the afternoon of the 20th precipitation began as freezing rain and ice pellets in southern Iowa, then changed over to snow and spread across the remainder of the state. Across the south all surfaces were covered with a glaze of ice followed by several inches of snow, then winds increased to 20 to 30 mph causing whiteout conditions at times. Hundreds of vehicles slid into ditches and there were numerous accidents across the region. Meanwhile heavy snow fell across northern Iowa with a band of thunder snow producing accumulations of 12 to 16 inches roughly from Sioux City to Decorah. The snow fell at rates of 3 to 4 inches per hour at some locations. The highest official snowfall totals included 13.1 inches at Britt, 15.3 inches at Sioux City, and 16.0 inches at Algona, Sioux Rapids, and Storm Lake, with unofficial amounts of 18 to 20 inches reported in areas around Storm Lake.

21 February 1971 → An F5 tornado that touched down in Madison Parish, LA killed 10 people in Louisiana and then another 36 in Mississippi. An hour later, an F4 tornado killed 58 and injured 700 between Vicksburg and Oxford, MS. The same storm system was also responsible for a crippling blizzard in the Plains, which brought 13 inches of snow and 40 mph winds to Wichita. 21 February 1998 → A storm system in south central Texas moved in from the west, causing a round of severe weather for the area including flooding, hail, and damaging winds. Luckily no tornadoes were reported.

Posted under Weather History