Heat in Osceola, Iowa

Heat index values peaked as high as 103 degrees 6 miles northeast of Hartley, 102 degrees at Ashton, 101 degrees at May City, and 100 degrees 2 miles northeast of Sibley.

High levels of moisture pooled along and ahead of an outflow boundary across eastern South Dakota and southwest Minnesota with dew point readings into the the upper 70s to lower 80s. With temperatures in the upper 80s to lower 90s, heat index values generally reached the 100 to 110 degree range during the mid afternoon to early evening.