A large upper-level high resulted in four consecutive days of dangerously high heat indices from 105 to 115 degrees. The large high in the upper levels of the atmosphere expanded over much of the southern two-thirds of the United States for several days. The center of the high gradually shifted east from the southern Plains on the 19th to the middle Mississippi Valley on the 22nd. The high then weakened and shrank on the 23rd. The daily peak heat indices at Carbondale during the heat wave were 108 degrees on the 19th and 20th, 111 degrees on the 21st, and 106 degrees on the 22nd. Actual air temperatures reached the mid 90's each afternoon. Overnight lows were in the mid 70's.

Excessive Heat in ALEXANDER, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in EDWARDS, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in FRANKLIN, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in GALLATIN, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in HAMILTON, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in HARDIN, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in JACKSON, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in JEFFERSON, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in JOHNSON, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in MASSAC, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in PERRY, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in POPE, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in PULASKI, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in SALINE, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in UNION, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WABASH, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WAYNE, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WHITE, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WILLIAMSON, ILLINOIS
From 19-JUL-17 12:00:00 to 22-JUL-17 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS