From NWS
1970: Severe thunderstorms produced a few tornadoes and widespread damaging straight-line winds across eastern Iowa. Three tornadoes struck portions of Butler, Floyd, Bremer, and Dubuque counties tracking across rural areas and mostly damaging farm outbuildings. One of the tornadoes moved a pickup truck a hundred yards and destroyed a number of barns in Floyd County. Further southeast winds of 60 to 80 mph produced significant damage and 16 injuries in and around Dubuque.

1912: A year that had begun with one of the coldest and snowiest Iowa winters on record then saw late summer heat persist well into September. The heat wave peaked on the 8th with a high temperature of 104 F at Ottumwa and continued on the 9th before milder air finally moved in on the 10th. Several stations across Iowa registered their latest triple digit heat on record on the 9th, including Burlington with a high of 100 F. Readings of 100 F were also reported at Albia and Bloomfield and the temperature reached 101 F at Allerton, Centerville, and Corydon. Incredibly, a series of ensuing cold fronts during the following week brought temperatures down into the 40s and even upper 30s by September 17th when Storm Lake reported a trace of snow, making it one of the earliest observances of snow on record in Iowa.

9 September 1776 → The Hurricane of Independence battered coastal areas from North Carolina to Nova Scotia from September 2 to September 9. It is believed that 4,170 people in the U.S. and Canada died in the storm. 9 September 1821 → New England’s most prolific tornado outbreak. The half-mile wide Great New Hampshire Tornado killed 6 and devastated areas around Lake Sunapee and Mt. Kearsarge. Hailstones 14 inches in circumference and “filled with grass and gravel” fell on the Hudson Valley. 9 September 1921 → Thrall, TX set the U.S. record for rainfall in 18 hours, with 36.40″. 9 September 1960 → The storm surge from Hurricane Donna submerged the Overseas Highway. The hurricane broke the pipeline that supplied fresh water to the Florida Keys. 9 September 1964 → Hurricane Dora became one of the few hurricanes to strike the extreme northeast part of Florida. 9 September 2002 → A powerful squall line spawned four tornadoes that flattened buildings and took four lives in Mpumalanga, South Africa.

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