A combination of high heat and humidity persisted for several days. Daytime temperatures reached the 90s to a few degrees above 100, and dew points were in the 70s. The heat index went as high as 110 degrees. Low temperatures were in the 70s, leading to some uncooled indoor locations remaining excessively warm through the night. The dangerous nature of the heat was added to by its continuing over a period of several days.

Excessive Heat in O'BRIEN, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in OSCEOLA, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in SIOUX, IOWA
From 18-JUL-12 11:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to a few degrees above 100, and high humidity with dew points in the 70s, caused an extended period of excessive heat. The heat index peaked at 100 to 110 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in PLYMOUTH, IOWA
From 18-JUL-12 11:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to a few degrees above 100, and high humidity with dew points in the 70s, caused an extended period of excessive heat. The heat index peaked at 100 to 110 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in BUENA VISTA, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in WOODBURY, IOWA
From 18-JUL-12 11:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to a few degrees above 100, and high humidity with dew points in the 70s, caused an extended period of excessive heat. The heat index peaked at 100 to 110 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in CHEROKEE, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in CLAY, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in DICKINSON, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in IDA, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.

Excessive Heat in LYON, IOWA
From 21-JUL-12 12:00:00 to 24-JUL-12 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures reaching the 90s to about 100, and high humidity with dew points in the 70s, caused an few days of excessive heat. The heat index peaked at 100 to 106 degrees each day, and did not fall enough at night to provide much relief to indoor locations that were not otherwise cooled.