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Heavy Rainfall and Flash Flood Threats Shift From Southern Plains to Lower Mississippi Valley; Elevated to Critical Fire Concerns Out West

Heavy to excessive rainfall with flash flood concerns will shift from the southern Plains into the Lower Mississippi Valley. Elevated to Critical Fire weather threats will linger through the weekend across the Great Basin and central Rockies. Finally, Major to Record river flooding will continue in portions of the Midwest and across parts of North and South Carolina this weekend. Read More >

Weather History Archive

Weather History - August 21st

Local and Regional Events:

August 21, 1989:

Baseball size hail caused near 100 percent crop damage to Correll in Big Stone County to 10 miles north of Appleton. Most of Swift County also received 4 to 8 inches of rain.


August 21, 2007:

Thunderstorms produced large hail in southeastern South Dakota, mainly near the Missouri River, during the late afternoon and early evening of August 21st. Enormous hail fell in the Dante area in Charles Mix County, including a state record size hailstone certified as 6 and 7/8 inches in diameter, with a circumference of 18 inches and a weight of one pound. The most massive stone was verified at 6 1/8 inches in diameter with a weight of 1.25 lbs. Damage included holes in roofs, broken rafters, broken awnings, numerous broken windows and dented vehicles, damaged siding, divots in the ground up to 12 inches long and 3 inches deep, and damaged crops. The state record hailstone was broken on July 23rd, 2010 with the United States record hailstone in Vivian. Click HERE for more information from the NWS office in Sioux Falls.

Above is the 6 and 7/8 inch hailstone compared to a softball and baseball.


U.S.A and Global Events for August 21st:

1856: The Charter Oak was an unusually large white oak tree growing from around the 12th or 13th century until it fell during a windstorm on this day in 1856. According to tradition, Connecticut's Royal Charter of 1662 was hidden within the hollow of the tree to thwart its confiscation by the English governor-general. The oak became a symbol of American independence and is commemorated on the Connecticut State Quarter. Click HERE for pictures of the tree from the Connecticut Historical Society.


1883: An estimated F5 tornado caused extensive damage to Rochester Minnesota on this day. The enormous roar was said to have warned most Rochester residents, as the massive funnel cut through the north side of town. Over 135 homes were destroyed, and another 200 damaged. Many of the 200 plus injuries were severe, and other deaths probably occurred but not listed as part of the 37 total mentioned. This damaging tornado eventually led to the formation of the Mayo Clinic. Click HERE for more information.


Click HERE for more This Day in Weather History from the Southeast Regional Climate Center.