Surface temperatures reaching the mid to upper 90's combined with dew points in the 70s and lower 80s allowed for apparent temperatures, or the heat index, to exceed 105��F in rural MN counties and 100��F for multiple hours in the Twin Cities metropolitan area. Strong ridging aloft was in place over the southwestern U.S. which allowed for seasonally warm high temperatures to be carried east via zonal flow over the Central U.S.
In the lower levels, a surface low over the Dakotas along with transport of gulf moisture from the south allowed for dew point temperatures to remain elevated the night prior to July 27th, despite cloud cover lingering from prior convection over the northern plains. As clouds cleared the next day, daytime heating increased surface temperatures in an already humid air mass, causing heat indices to reach dangerous levels.
Some of the highest heat indices from this event were:
Granite Falls, MN in Yellow Medicine County: 116��F
Redwood Falls, MN in Redwood County: 113��F
Willmar MN, in Kandiyohi County: 111��F
Cambridge, MN in Isanti County: 108��F
St. Paul, MN in Ramsey County: 107��F
Blaine, MN in Anoka County: 107��F
Olivia, MN in Renville County: 107��F
Rush City Municipal Airport in Chisago County: 107��F
Princeton, MN in Sherburne County: 107��F
MSP Int���l Airport in Hennepin County: 103��F
Airlake Airport in Dakota County: 101��F.

Excessive Heat in ISANTI, MINNESOTA
From 27-JUL-23 11:30:00 to 27-JUL-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the upper 90s combined with high dewpoint values in the low to mid 70s, caused high heat indices exceeding 105��F for approximately three hours. The ASOS station located at the Cambridge Municipal Airport recorded an apparent temperature of 108��F at 2:35 PM (CST).

Excessive Heat in ANOKA, MINNESOTA
From 27-JUL-23 12:00:00 to 27-JUL-23 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid to upper 90s combined with high dewpoint values in the low to mid 70s, caused high heat indices exceeding 100��F for approximately six hours. The ASOS station located at the Blaine Airport recorded an apparent temperature of 107��F at 1:50 PM (CST).

Excessive Heat in WASHINGTON, MINNESOTA
From 27-JUL-23 12:00:00 to 27-JUL-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the low 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 100��F for approximately three hours. The ASOS station located at the Lake Elmo Airport recorded an apparent temperature of 101��F at 1:55 PM (CST).

Excessive Heat in SHERBURNE, MINNESOTA
From 27-JUL-23 12:00:00 to 27-JUL-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the upper 90s combined with high dewpoint values in the low 70s, caused high heat indices exceeding 105��F for approximately three hours. The ASOS station located at the Princeton Municipal Airport recorded an apparent temperature of 107��F at 4:15 PM (CST).

Excessive Heat in HENNEPIN, MINNESOTA
From 27-JUL-23 11:00:00 to 27-JUL-23 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the low 70s, caused high heat indices exceeding 100��F for approximately six hours. The ASOS station located at the Minneapolis International Airport recorded an apparent temperature of 103��F at 3:00 PM (CST).

Excessive Heat in DAKOTA, MINNESOTA
From 27-JUL-23 11:00:00 to 27-JUL-23 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the low 70s, caused high heat indices exceeding 100��F for approximately six hours. The ASOS stations located at the Minneapolis International Airport recorded an apparent temperature of 103��F at 3:00 PM (CST) and 101��F at Airlake Airport at 1:15 PM (CST).

Excessive Heat in RAMSEY, MINNESOTA
From 27-JUL-23 11:00:00 to 27-JUL-23 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the low to mid 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 100��F for approximately seven hours. The ASOS station located at the St. Paul Airport recorded an apparent temperature of 107��F at 1:00 PM (CST).

Excessive Heat in RENVILLE, MINNESOTA
From 27-JUL-23 14:00:00 to 27-JUL-23 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 105��F for approximately three hours. The ASOS station located in Olivia recorded an apparent temperature of 107��F at 4:35 PM (CST).

Excessive Heat in SCOTT, MINNESOTA
From 27-JUL-23 11:00:00 to 27-JUL-23 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 100��F for approximately six hours. Neighboring county ASOS stations located at the Flying Cloud Airport (Hennepin) recorded an apparent temperature of 106��F at 2:00 PM (CST) and 101��F at Airlake Airport (Dakota) at 1:15 PM (CST).

Excessive Heat in MCLEOD, MINNESOTA
From 27-JUL-23 13:00:00 to 27-JUL-23 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the low 90s combined with high dewpoint values in the upper 70s, caused high heat indices exceeding 105��F for approximately three hours. The ASOS station located at the Glencoe Municipal Airport recorded an apparent temperature of 108��F at 3:15 PM (CST).

Excessive Heat in KANDIYOHI, MINNESOTA
From 27-JUL-23 15:00:00 to 27-JUL-23 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the low 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 105��F for approximately three hours.  The ASOS station located at the Willmar Municipal Airport recorded an apparent temperature of 111��F at 6:15 PM (CST).

Excessive Heat in CARVER, MINNESOTA
From 27-JUL-23 13:00:00 to 27-JUL-23 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 100��F for approximately six hours. Neighboring county ASOS stations located at the Flying Cloud Airport (Hennepin) recorded an apparent temperature of 106��F at 2:00 PM (CST) and 108��F at the Glencoe Municipal Airport (McLeod) at 3:15 PM (CST).

Excessive Heat in YELLOW MEDICINE, MINNESOTA
From 27-JUL-23 10:00:00 to 27-JUL-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the upper 70s and low 80s, caused high heat indices exceeding 105��F for approximately eight hours. The ASOS station located at the Granite Falls Municipal Airport recorded an apparent temperature of 116��F at 5:35 PM (CST).

Excessive Heat in SIBLEY, MINNESOTA
From 27-JUL-23 14:00:00 to 27-JUL-23 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 105��F for approximately three hours. Neighboring county ASOS stations located in Olivia (Renville) recorded an apparent temperature of 107��F at 4:35 PM (CST) and 108��F at the Glencoe Municipal Airport (McLeod) at 3:15 PM (CST).

Excessive Heat in REDWOOD, MINNESOTA
From 27-JUL-23 14:00:00 to 27-JUL-23 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the low 90s combined with high dewpoint values in the upper 70s, caused high heat indices exceeding 105��F for approximately three hours. The ASOS station located at the Redwood Falls Municipal Airport recorded an apparent temperature of 113��F at 5:30 PM (CST).

Excessive Heat in CHISAGO, MINNESOTA
From 27-JUL-23 11:30:00 to 27-JUL-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Warm environmental temperatures in the mid to upper 90s combined with high dewpoint values in the mid 70s, caused high heat indices exceeding 105��F for approximately three hours. The ASOS station located at the Rush City Municipal Airport recorded an apparent temperature of 107��F at 2:15 PM (CST).