Extreme Cold/Wind Chill in Harmon, Oklahoma

An expansive, high-amplitude upper trough sat across the eastern two-thirds of the CONUS during the middle of the month. An embedded system (and associated surface front) made quick southeastward progress across the Plains on the 20th. This strong frontal intrusion brought about another period of very cold temperatures and wind chills across the WFO Norman area. An intense band of snow was also observed near the front on the afternoon/evening of the 20th, resulting in reduced visibility and light accumulation (<3 inches) across portions of northern Oklahoma.