National Weather Service United States Department of Commerce


A strong upper level ridge of high pressure developed across the Ohio and Tennessee Valley, producing a record breaking early season heat wave. Numerous record highs and warm lows were established across our forecast area, including the first triple digit temperatures experienced since 2016 in Cape Girardeau, MO and 2013 in Poplar Bluff, MO. Low temperatures in the 80s were observed in several locations, setting monthly and all-time records in some cases. Heat index values exceeded 105 degrees starting on June 12 and continued through June 16. The most oppressive day was June 13th, when dewpoints in the mid 70s to around 80 produced heat index values of 110 to nearly 120.

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