A combination of high heat and humidity persisted for several days. Daytime temperatures reached the 90s to several 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. The excessive heat caused an unknown number of heat related illnesses, including at least 10 people transported to area hospitals from the Sioux Falls air show during the weekend of July 21st and 22nd.

Excessive Heat in MINNEHAHA, SOUTH DAKOTA
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. The excessive heat resulted in numerous heat related health complaints at the Sioux Falls air show on July 21st and 22nd. At least 10 people were transported to area hospitals and treated for heat exhaustion.

Excessive Heat in SANBORN, SOUTH DAKOTA
From 19-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 just 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 108 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 DAVISON, SOUTH DAKOTA
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 GREGORY, SOUTH DAKOTA
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 DOUGLAS, SOUTH DAKOTA
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 BRULE, SOUTH DAKOTA
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 CHARLES MIX, SOUTH DAKOTA
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 CLAY, SOUTH DAKOTA
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 HANSON, SOUTH DAKOTA
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 HUTCHINSON, SOUTH DAKOTA
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 JERAULD, SOUTH DAKOTA
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 KINGSBURY, SOUTH DAKOTA
From 19-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 just 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 108 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 MINER, SOUTH DAKOTA
From 19-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 just 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 108 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 LAKE, SOUTH DAKOTA
From 19-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 just 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 108 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 LINCOLN, SOUTH DAKOTA
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 TURNER, SOUTH DAKOTA
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 MCCOOK, SOUTH DAKOTA
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 UNION, SOUTH DAKOTA
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 YANKTON, SOUTH DAKOTA
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 BEADLE, SOUTH DAKOTA
From 19-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 just 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 108 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 BON HOMME, SOUTH DAKOTA
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 AURORA, SOUTH DAKOTA
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.