Excessive Heat in Delta, Michigan
Excessive Heat June 30, 2026 · Delta, Michigan
What the National Weather Service wrote
The High Bridge RAWS site HBRM4 reported heat index values in excess of 105 degrees from 11 AM EST through 3 PM with a peak value of 110 at 1 PM.
Additionally, the AWOS site KESC at the Delta County Airport and STOM4, the Stonington RAWS site, reached a peak heat index in excess of 105 degrees despite close proximity to the cooling influence of Lake Michigan.
The wider storm
As a significant ridge was over the southeastern US, hot and unstable air was over Michigan's Upper Peninsula by the 30th. This warm and moist air caused unseasonable heat impacts, and forcing from an approaching upper level disturbance over the Canadian Prairie initiated thunderstorms that caused multiple forms of severe weather, including the first confirmed tornado for the Upper Peninsula since 2020.
Other tornadoes from the same storm system
1 more tornado the National Weather Service filed under this storm episode.
Source: NOAA Storm Events Database, event 1345569. Narratives are written by the National Weather Service forecast office that issued the report.
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