Wed-Sun, July 17-21st Heat Wave Update #7

(10:45AM - 7/19/19) A multi-day heat wave will continue to affect the state through Sunday, with widespread hot and humid conditions are likely.

7/19/19 - Today/Tonight's Forecast...
High temperatures on today will likely reach the low to upper 90's across much of the state, with isolated temperatures around 100 possible. Heat index readings will range from 100-115 across the state. Low temperatures tonight will stay in the mid 70's to low 80's.

7/20/19 - Saturday/Night Forecast...
High temperatures on Saturday will likely reach the low to upper 90's across much of the state, with isolated temperatures around 100 possible. Heat index readings will range from 100-115 across the state. Low temperatures Saturday night will stay in the 70's for much of Central and Southern Illinois, with temperatures closer to 80 or in the low 80's possible for the more urban areas, such as St. Louis. Rain and t'storms will likely push into portions of Northern Illinois Saturday evening and night, leading to cooler low temperatures across this area.

7/17/19 - Wednesday/Night Recap...
High temperatures on Wednesday were in the upper 80's to mid 90's across much of the state, with heat indices between 90-105. Low temperatures Wednesday night were in the upper 60's to mid 70's.

7/18/19 - Thursday/Night Recap...
High temperatures on Thursday were in the upper 80's to mid 90's across much of the state, with heat indices between 95-110. Low temperatures Thursday night were in the mid 70's to low 80's across much of the state.

A ridge across the middle of the country will bring an extended period of hot and humid conditions to the state through Sunday. A 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 around across the state during the period. Thursday through Saturday look to be the hottest days of the period, with widespread high temperatures in the mid 90's to around 100 likely 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 near 100, 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 Saturday. The St. Louis and Chicago areas are most susceptible for this.

​Below is the TAM heat and humidity forecast through Sunday.

​JP

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