A large upper-level high resulted in two to three 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 a few days. The center of the high gradually shifted east from the southern Plains on the 20th to the middle Mississippi Valley on the 22nd. The high then weakened and shrank on the 23rd. The daily peak heat indices at Paducah during the hot weather were 109 degrees on the 21st and 107 degrees on the 22nd. At Hopkinsville, the peak heat index was 106 on the 21st,  107 on the 22nd, and about 105 on the 23rd. A number of Kentucky mesonet sites and automated airport sites reported peak heat indices from 110 to 115 on the 21st and 22nd. Actual air temperatures reached the mid to upper 90's both afternoons. Overnight lows were in the mid to upper 70's. Cooling centers were opened in Marshall County to accomodate residents needing help.

Excessive Heat in BALLARD, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in CALDWELL, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in CALLOWAY, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in CARLISLE, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in CHRISTIAN, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in CRITTENDEN, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in DAVIESS, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in FULTON, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in GRAVES, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in HENDERSON, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in HICKMAN, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in HOPKINS, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in LIVINGSTON, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in LYON, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in MARSHALL, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in MCCRACKEN, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in MCLEAN, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in MUHLENBERG, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in TODD, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in TRIGG, KENTUCKY
From 21-JUL-17 11:00:00 to 23-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in UNION, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Excessive Heat in WEBSTER, KENTUCKY
From 21-JUL-17 11:00:00 to 22-JUL-17 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet