Excessive Heat in Buena Vista, Iowa

Excessive Heat July 27, 2025 – July 28, 2025 · Buena Vista, Iowa

What the National Weather Service wrote

Dangerous heat index readings reached an afternoon peak on July 27 as high as 116 degrees near Alta, 109 degrees in Storm Lake, and 108 degrees near Rembrandt.

The wider storm

Beneath an expansive and strong, flat ridge aloft, extreme surface-based moisture returned near a diffuse warm frontal boundary on July 26 and lasted into the afternoon of July 28. While this moisture and heat would eventually fuel the derecho during the evening hours of July 28, dangerous heat indices from 105 to 120 degrees were common.

Source: NOAA Storm Events Database, event 1288602. Narratives are written by the National Weather Service forecast office that issued the report.

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