A cold front moving across the Northern Plains on Friday will be the focus for thunderstorm development from the Northern Plains into the Midwest.

• Thunderstorms across the Northern Plains and Midwest on Friday
• Potential for Thunderstorms Saturday for the Upper Mississippi Valley and Great Lakes
• Risk for Thunderstorms across the Intermountain West on Saturday
• Strong to Severe Thunderstorms Possible Sunday from the Northeast into the Tennessee Valley
• Thunderstorms for the Northern Rockies on Sunday

US Hazards

Thunderstorms across the Northern Plains and Midwest on Friday
A weak upper low is approaching the Northern Plains this afternoon, with an attendant cold front moving through the Dakotas. Afternoon thunderstorms, some of which could become severe, will pose a risk for large hail and severe winds, mainly before dark. As the low continues to move eastward after dark, additional thunderstorms may develop across portions of Minnesota and Wisconsin. Large hail and damaging winds will be the primary hazards with these storms.

Major Cities in Region: Bismarck, ND, Pierre, SD, International Falls, MN

Region 1

Potential for Thunderstorms Saturday for the Upper Mississippi Valley and Great Lakes
The potential for strong to severe thunderstorms will shift into the Great Lakes on Saturday. A cold front will continue to push eastward through the region, with scattered thunderstorms developing ahead of the front during the afternoon. Large hail and gusty winds will be the primary hazards with any storms that develop. 

Major Cities in Region: Minneapolis, MN, Madison, WI, Green Bay, WI, Milwaukee, WI, Traverse City, MI, Grand Rapids, MI

SPC Convective Outlook for Saturday

Risk for Thunderstorms across the Intermountain West on Saturday
As an upper level disturbance moving into the Pacific Northwest, thunderstorms may develop across portions of the Intermountain West during the afternoon and evening. Gusty winds and hail will be the primary hazards with any storms that develop.

Major Cities in Region: Spokane, WA

SPC Convective Outlook for Saturday

Strong to Severe Thunderstorms Possible Sunday from the Northeast into the Tennessee Valley
As an area of low pressure tracks into Quebec, there will be a risk for strong to severe thunderstorms across portions of the Northeast into the Ohio and Tennessee River Valleys. Activity is expected to be scattered to widespread across the Northeast during the morning and afternoon with strong to severe thunderstorms possible by the afternoon. Damaging winds will be the primary hazard with any storms that develop. Along the cold front over the Valleys, isolated to scattered thunderstorms may develop during the afternoon where large hail and strong winds will be the primary hazards into the early evening. 

Major Cities in Region: Indianapolis, IN, Detroit, MI, Cleveland, OH, Pittsburgh, PA, Buffalo, NY, Syracuse, NY

SPC Convective Outlook for Sunday

Thunderstorms for the Northern Rockies on Sunday
An upper level disturbance is forecast to move eastward across the western US on Sunday. This will promote the development of thunderstorms across the Northern Rockies during the afternoon and evening. Scattered thunderstorms are expected to develop across the higher terrain; a few storms may become supercellular. Hail and damaging winds will be the primary hazards, though a few tornadoes cannot be ruled out.

Major Cities in Region: Missoula, MT, Helena, MT, Great Falls, MT

SPC Convective Outlook for Sunday

A Look Ahead
A few thunderstorms may develop along the Gulf Coast on Monday as a result of a stalled front, but severe weather is not currently expected. Otherwise, no significant weather is expected through midweek.

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