National Weather Service United States Department of Commerce

Severe Thunderstorms August 10, 2021

Severe thunderstorms tracked across much of Upper Michigan from late morning through early evening on Tuesday, August 10.

Throughout the event there was an elevated stable layer that mostly prevented the strong winds aloft in the storms from reaching the surface. Therefore, the main threat early on was large hail. The storms produced hail up to baseball size near Watersmeet, and up to ping pong ball size near Witch Lake.

However, as the day went on, the storms became surface-based and took advantage of a shallow surface-based mixed layer to produce some localized wind damage in two pockets. One of those pockets was around Witch Lake and the other around Gwinn and Shag Lake. There were thousands of customers without power in these areas because of downed trees and snapped power poles.

A second storm behind the main line pulsed up and produced quarter size hail in Harvey before quickly weakening again. Large hail was also reported in Trenary.

Map of storm reports, courtesy of the Iowa State Environmental Mesonet webpage

Click this link for a complete list of reports of hail, wind damage, and heavy rainfall from this event.

nws logo Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.
nws logo