An upper level ridge of high pressure built across the central United States and brought a prolonged period of excessive heat across eastern Nebraska and southwest Iowa.  High temperatures during this stretch reached the 90s to a little over 100 degrees and dew point temperatures were in the 70s and in some cases the lower 80s.  This brought heat index values into the 105 to 115 degree or even higher range during the afternoon and early evening hours during this time.  Low temperatures provided little relief dropping only into the 70s to around 80.  A weak cold front that pushed into the region late on the 20th brought some relief to parts of the area.  However, the front stalled northwest of far southwest Iowa so excessive heat index values persisted for several days longer across that area.

Excessive Heat in MONONA, IOWA
From 16-JUL-11 14:00:00 to 20-JUL-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in POTTAWATTAMIE, IOWA
From 15-JUL-11 11:00:00 to 20-JUL-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in MILLS, IOWA
From 15-JUL-11 12:00:00 to 20-JUL-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in FREMONT, IOWA
From 15-JUL-11 12:00:00 to 23-JUL-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in PAGE, IOWA
From 15-JUL-11 12:00:00 to 23-JUL-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in MONTGOMERY, IOWA
From 15-JUL-11 12:00:00 to 23-JUL-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in HARRISON, IOWA
From 16-JUL-11 14:00:00 to 20-JUL-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.

Excessive Heat in SHELBY, IOWA
From 16-JUL-11 13:00:00 to 20-JUL-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Afternoon temperatures in the 90s combined with dew point temperatures in the 70s to even lower 80s and produced a prolonged period where afternoon and early evening heat index values climbed into the 105 to 115 degree and even higher range.  Low temperatures during this time provided little relief, only dropping into the 70s to around 80 degrees.