An Excessive Heat Warning was in effect for portions of the forecast area for 7 days as a heat wave dominated the area. This was the longest duration Excessive Heat Warning that the Omaha office has issued. A total of 10 temperature records at Omaha, Lincoln, and Norfolk were tied or broken as the air temperature routinely topped 100�� and overnight low temperatures largely remained above 75��. High dew points led to heat indices that routinely topped 110��.
The heat wave began on August 19 as a mid-level ridge moved over the central CONUS. Temperatures in southwest Iowa ranged from the mid 90s and reached 100 at the Council Bluffs airport. Heat indices topped 120�� for several days as dewpoint temperatures were near 80��. A cold front moved into the area on August 20, but only brought a brief relief. Overnight low temperatures the morning of August 20 largely remained above 75 degrees. On August 21, afternoon highs returned to the 90s and heat indices easily topped 110��.

Excessive Heat in POTTAWATTAMIE, IOWA
From 19-AUG-23 13:00:00 to 25-AUG-23 16:00:00 (CST-6)
Reported by: AWOS

For 7 days, the high temperature was above 90�� for all but August 20 and August 25. The highest observed temperature was 100�� on August 24. The peak heat index reached at least 100�� each day. The highest calculated heat index was a 114�� on August 21. The morning low temperatures never dropped below 72�� during the heat wave. The morning low temperature August 24 was 81��.

Excessive Heat in SHELBY, IOWA
From 19-AUG-23 13:00:00 to 24-AUG-23 19:00:00 (CST-6)
Reported by: AWOS

Beginning on August 19, the high temperature at the Harlan AWOS reached at least 91�� through August 24 except for August 20. The highest observed temperature was 99�� on August 24. The peak heat index reached at least 105�� each day. The highest calculated heat index was a 126�� on August 21.

Excessive Heat in PAGE, IOWA
From 19-AUG-23 13:00:00 to 25-AUG-23 17:30:00 (CST-6)
Reported by: AWOS

Beginning on August 19, the high temperature at the Clarinda AWOS reached at least 93�� each day through August 25 except for August 20. The highest observed temperature was 97��, occurring on both August 24 and August 25. The peak heat index reached at least 110�� each day. The highest calculated heat index was a 120��, occurring on both August 21 and August 23.

Excessive Heat in FREMONT, IOWA
From 19-AUG-23 12:00:00 to 25-AUG-23 17:30:00 (CST-6)
Reported by: AWOS

Beginning on August 19, the high temperature at the Shenandoah AWOS reached at least 95�� each day through August 25 except for August 20. The highest observed temperature was 99�� on August 24. The peak heat index reached at least 108�� each day. The highest calculated heat index was a 124��, occurring on both August 21 and August 22.

Excessive Heat in HARRISON, IOWA
From 19-AUG-23 12:00:00 to 24-AUG-23 18:00:00 (CST-6)
Reported by: RAWS

Beginning on August 19, the high temperature at the Loess Hill RAWS reached at least 96�� each day through August 25 except for August 20. The highest observed temperature was 101��, occurring on both August 22 and August 23. The peak heat index reached at least 103�� each day. The highest calculated heat index was a 122��, occurring on August 21 and August 22.

Excessive Heat in MILLS, IOWA
From 19-AUG-23 12:00:00 to 25-AUG-23 18:00:00 (CST-6)
Reported by: Public

For 7 days beginning on August 19, the high temperature in Mills County was in the 90s and topped 100�� in some locations. Dew point temperatures in the area were in the mid to upper 70s and were likely at or above 80��. This yielded heat indices of at least 110�� all 7 days.

Excessive Heat in MONTGOMERY, IOWA
From 19-AUG-23 12:00:00 to 25-AUG-23 16:00:00 (CST-6)
Reported by: AWOS

Beginning on August 19, the high temperature at the Red Oak AWOS reached at least 93�� each day through August 25 except for August 20. The highest observed temperature was 99�� on August 24. The peak heat index reached at least 105�� each day. The highest calculated heat index was a 122�� on August 22.

Excessive Heat in MONONA, IOWA
From 21-AUG-23 12:00:00 to 24-AUG-23 17:00:00 (CST-6)
Reported by: COOP Observer

For 4 days beginning on August 21, the high temperature in Mapleton reached at least 95��. The highest observed temperature was 99��, occurring on both August 22 and August 23. Dew point temperatures in the area were in the mid to upper 70s which yielded a heat index of at least 105�� all 4 days.