It was a torrid Tuesday over southern Manitoba as a southwest flow of hot dry air sent temperatures into the mid to upper thirties over the Red River valley. In Winnipeg, the mercury soared to a record breaking 37.2C by 2:30 pm, beating the previous high for Aug 23rd of 36.7C set in 1952. Not only was this the hottest day of the summer, it was also Winnipeg's hottest temperature since June 17 1995 when the city hit 37.8C. The record heat today was accompanied by very dry conditions (see YWG 22Z sounding), with dewpoints dropping to the 10C mark by mid afternoon giving humidity values of only 20%. At my Rob's Obs station in Charleswood, a maximum temperature of 38.0C was reached at 2:49 pm today, the hottest temperature at my site since it was started in 2001. (see my station's temperature trace above)
Luckily the record heat will be short lived. A cold front was pushing through southern Manitoba Tuesday evening dropping temperatures into the 20s accompanied by gusty northwest winds. This front will usher in a cooler airmass for Wednesday with temperatures some 10 degrees cooler than today.