Severe Storms Roll Into The Midwest, Southern Canada

Tom Moore
Published: June 25,2016

Scattered severe thunderstorms are expected to develop in portions of the Upper Midwest, as the next upper-level low pressure system continues to push into the region.
This system will press east on Sunday, bringing the risk of severe thunderstorms to parts of the Midwest and Great Lakes.
Severe thunderstorm watches are shaded in yellow below:

Current Radar with Watches and Warnings

(MORE: View National Interactive Radar Map | Difference Between a Watch and a Warning)
Below is our latest forecast thinking on the timing and magnitude of the severe threats into the weekend.

Severe Weather Forecast

Saturday Evening

• Forecast: Scattered severe thunderstorms are expected over parts of the Upper Midwest including much of Minnesota, Iowa, and eastern Nebraska during the early evening. Storms will move into southern Minnesota, Wisconsin and the western Upper Peninsula of Michigan by late evening.
• Threats: Damaging winds, hail and isolated tornadoes possible. 
• Cities: Des Moines, IA | Minneapolis | Green Bay, Wisconsin | Kansas City

Saturday's Thunderstorm Forecast

Sunday

• Forecast: Much of the dynamics needed for severe weather will move up into Canada, but widely scattered severe thunderstorms are still possible around the Great Lakes, from Michigan to parts of Indiana and Ohio.
• Threat: Damaging winds, large hail and an isolated tornado are possible.
• Cities: Detroit | Toledo, Ohio | Indianapolis

Sunday's Thunderstorm Forecast

This low-pressure system will continue to move east on Monday bringing thunderstorms from the Northeast into the Tennessee Valley, but the severe threat will diminish.

Severe Weather Setup

The main feature that will trigger severe thunderstorms in the Upper Midwest is an area of low pressure, often called a "bowling ball" in the upper atmosphere. The center of the low will be just north of the Canadian border, with the Great Lakes and southern Canada threatened Sunday.
This feature will provide the necessary dynamics needed for severe weather.
The low will move farther away from the U.S. by Sunday, so the chance for severe weather will be lower by then across the Great Lakes region.

Upper Low Will Provide the Dynamics for Severe Weather

Friday's Storm Reports

Hail up to ping pong ball size caused tree damage near Snyder, Colorado Friday evening. Wind gusts over 70 mph were measured in portions of northeastern Montana, including near Sprole were a gust of 85 mph was recorded.

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PHOTOS: Plains Severe Weather May 9,2016