Excessive Heat — Turner, South Dakota

2025-07-21 to 2025-07-22 · Turner, South Dakota

Event narrative

Dangerous heat index readings reached daily afternoon peaks as high as 107 degrees near Centerville on July 21.

Wider weather episode

Moisture pooled in the vicinity of a nearly stationary boundary early on July 21, which slowly worked northward as a warm front over the next two days while a large upper level ridge expanded across the Northern Plains. Most areas experienced heat index values from 100 to 115 degrees, with the most consistent and highest heat index values on the afternoon of July 23 across far southeast South Dakota, northwest Iowa, and northeast Nebraska.

Source: NOAA Storm Events Database, event_id 1288564. Narrative written by the NWS forecast office that issued the report.