Heat — Lyon, Iowa

2025-08-15 to 2025-08-16 · Lyon, Iowa

Event narrative

Heat index values peaked as high as 102 degrees 4 miles southwest of George on August 15 and 100 degrees 5 miles south-southwest of Ellsworth and at Larchwood on August 16.

Wider weather episode

Heat and moisture pooled near and south of a nearly stationary frontal boundary across eastern South Dakota and southern Minnesota. Daily highs were in the mid 80s to lower 90s with dew point values in the upper 70s to lower 80s, yielding heat index values from 100 to 115 degrees.

Source: NOAA Storm Events Database, event_id 1291158. Narrative written by the NWS forecast office that issued the report.