A dome of hot and humid air over the southern and central Plains built northward into the Upper Midwest from July 17th through July 21st. High temperatures climbed into the lower to middle 90s, which combined with muggy dew points in the middle 70s to lower 80s produce heat index values between 100 and 110 for four straight days. Three people were confirmed to have died due to the excessive heat: one each in the couinties of Columbia, Marquette, and Sauk.  Based on news reports, it is estimated that about 25 people in Dane County received medical treatment for the heat, and 5 people each in the counties of Rock, Columbia, and Sauk.  There may have been people in other counties that received medical treatment, but this could not be verified.

Excessive Heat in GREEN LAKE, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: COOP Observer

Maximum daily heat index values ranged from 101 to 108 over the four days of July 17th through July 20th.

Excessive Heat in FOND DU LAC, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: ASOS

Maximum daily heat index values ranged from 101 to 109 over the four days of July 17th through July 20th.

Excessive Heat in SAUK, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: RAWS

Maximum daily heat index values ranged from 102 to 108 over the four days of July 17th through July 20th. An 87-year-old Reedsburg woman was found dead in her home, which did not have air conditioning. Her death was determined to be heat-related.

Excessive Heat in DANE, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: ASOS

Maximum daily heat index values ranged from 102 to 110 over the four days of July 17th through July 20th.

Excessive Heat in JEFFERSON, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: AWOS

Maximum daily heat index values ranged from 100 to 108 over the four days of July 17th through July 20th.

Excessive Heat in LAFAYETTE, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: COOP Observer

Maximum daily heat index values ranged from 104 to 107 over the four days of July 17th through July 20th.

Excessive Heat in MARQUETTE, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: COOP Observer

Maximum daily heat index values ranged from 104 to 110 over the four days of July 17th through July 20th.  An 80-year-old Illinois man died from heat-related causes while staying at his second home in Marquette County.  The man had underlying medical problems that contributed to his death while spending time outside.

Excessive Heat in GREEN, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: AWOS

Maximum daily heat index values ranged from 101 to 107 over the four days of July 17th through July 20th.

Excessive Heat in ROCK, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: AWOS

Maximum daily heat index values ranged from 105 to 107 over the four days of July 17th through July 20th.

Excessive Heat in WALWORTH, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: AWOS

Maximum daily heat index values ranged from 101 to 105 over the four days of July 17th through July 20th.

Excessive Heat in COLUMBIA, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: COOP Observer

Maximum daily heat index values ranged from 106 to 109 over the four days of July 17th through July 20th. A 65-year-old male, residing near Fall River, died from the heat. The county medical examiner said the man had underlying medical conditions, that combined with the heat, contributed to his death.

Excessive Heat in DODGE, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: AWOS

Maximum daily heat index values ranged from 106 to 109 over the four days of July 17th through July 20th.

Excessive Heat in IOWA, WISCONSIN
From 17-JUL-11 11:00:00 to 21-JUL-11 02:00:00 (CST-6)
Reported by: AWOS

Maximum daily heat index values ranged from 103 to 113 over the four days of July 17th through July 20th.