Wed-Mon, July 17-22nd Heat Wave
(9:30PM - 7/15/19) A multi-day heat wave will occur across the state, from Wednesday through Monday.
A developing ridge across the middle of the country will bring an extended period of hot and humid conditions to the state, Wednesday through Monday. A continued southwest flow aloft will continuously pull in warmer temperatures aloft into the region. With good mixing of the atmosphere expected, high temperatures across the state will likely range from the low 90's to low 100's across the state during the period. Thursday through Sunday look to be the hottest days of the period, with widespread high temperatures in the upper 90's to low 100's possible across the state.
In addition to the hot temperatures, high humidity is also expected. Dew points will likely be well into the 70's much of the period, which when combined with high temperatures in the low 90's to low 100's, will lead to heat indices of 100-115 during much of the period.
Low temperatures will also stay quite warm, only getting down into the 70's for much of the state during the period. However, low temperatures will likely stay near 80 or in the low 80's for urban ares, Thursday through Sunday. The St. Louis and Chicago areas are most susceptible for this.
As modeled at this time, this will be a higher end heat wave, with records in play for many areas. This will likely be the most significant and widespread heat wave across the state since 2012.
Below is the TAM heat and humidity forecast for Wednesday through Monday.
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