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On December 15, 2021, a rapidly-deepening low-pressure area contributed to a historic expanse of inclement weather across the Great Plains and Midwestern United States, resulting in an unprecedented [5] December derecho and tornado outbreak across portions of the Northern United States, a region normally affected by snow and cold weather during this time of year.
The tornado outbreak set a new record for the most tornadoes to hit Iowa in a single day with 61, far exceeding the previous record of 35 tornadoes set on August 31, 2014. Additionally, 21 of the tornadoes in Iowa were rated EF2 which beat the previous record of 16 EF2/F2 or greater tornadoes set on June 7, 1984.
This page documents all tornadoes confirmed by various weather forecast offices of the National Weather Service in the United States in December 2021. In December, tornadoes are most likely in the southern states due to their proximity to the unstable airmass and warm waters of the Gulf of Mexico, with only occasional incursions farther north. [1]
The 49 tornadoes in both May and April are tied for the third most tornadoes in a single month in Iowa's history. December 2021 produced 63 tornadoes, which is the Iowa single-month record.
The tornado destroyed much of Greenfield, a town of about 2,000 around 55 miles (88.5 kilometers) southwest of Des Moines, during a day that saw multiple tornadoes, giant hail and heavy rain in ...
Sixty-three tornadoes ripped through Iowa on Dec. 15, 2021 − the single biggest day of confirmed tornadoes in state history. That was an unusual weather pattern, Schoor said.
An EF0 tornado touched down in Canajoharie, New York. An isolated brief EF0 tornado also touched down in Millis, Massachusetts with winds of 75–80 mph (121–129 km/h), only damaging trees and taking down a metal lamp post. [70] [71] December 2021 Midwest derecho and tornado outbreak: December 15, 2021
December 2021 Midwest derecho and tornado outbreak; G. 2024 Greenfield tornado; I. Iowa tornado outbreak of July 2018; L. List of tornadoes in the outbreak of April ...