Heat indices peaked between 105 and 112 degrees across southern Illinois during the afternoon hours. From Marion southward to Metropolis and Cairo, the heat index peaked at or just above 110 degrees. Elsewhere across southern Illinois, the peak heat index was from 105 to 109. Actual air temperatures reached the lower 90's from Marion southward, and generally around 90 elsewhere. Dew points were in the upper 70's to near 80, which resulted in the very high heat indices. At mid levels of the atmosphere, a large ridge of high pressure dominated the southern half of the United States. A weak surface warm front over the lower Ohio Valley caused dew points to pool into the upper 70's to near 80.

Excessive Heat in ALEXANDER, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in PULASKI, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in MASSAC, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in JOHNSON, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in UNION, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WILLIAMSON, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in EDWARDS, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in WABASH, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in WAYNE, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in JEFFERSON, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in PERRY, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in FRANKLIN, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in HAMILTON, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in WHITE, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in JACKSON, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Heat in SALINE, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in GALLATIN, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in HARDIN, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heat in POPE, ILLINOIS
From 12-AUG-19 10:00:00 to 12-AUG-19 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS