Excessively high heat indices were recorded in the late morning and afternoon hours of both the 3rd and 4th. On the 3rd, the heat index peaked at 118 degrees at the Carbondale airport. Similar values were measured elsewhere in southern Illinois. Heat indices only fell into the mid 80's at sunrise. On the 4th, the heat index peaked at 112 at Carbondale. The actual air temperature reached 104 degrees at Carbondale. In the Shawnee National Forest, two hikers were overtaken by the heat. The dehydrated hikers were taken by ambulance to a local hospital, where they were treated and released. A large, strong high in the upper levels of the atmosphere overspread the southern half of the nation.

Excessive Heat in JOHNSON, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in MASSAC, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in PERRY, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in POPE, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in PULASKI, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in UNION, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in SALINE, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WABASH, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WAYNE, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in JEFFERSON, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WHITE, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WILLIAMSON, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in FRANKLIN, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in GALLATIN, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in HAMILTON, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in HARDIN, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in JACKSON, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in ALEXANDER, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in EDWARDS, ILLINOIS
From 03-AUG-10 10:00:00 to 04-AUG-10 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS