Significant Severe Weather Outbreak Possible Across the Northern Plains and Upper Midwest
Significant Severe Weather Outbreak Possible Across the Northern Plains and Upper Midwest
Meteorologists are closely monitoring a powerful storm system that will emerge from the Pacific Northwest and move into the Canadian Prairies early next week. As the system tracks into Saskatchewan and Manitoba, conditions are expected to become increasingly favorable for a potentially significant severe weather outbreak across portions of the northern Plains and Upper Midwest.
The key feature driving this threat will be a rapidly intensifying upper-level trough that is forecast to take on a pronounced negative tilt by Tuesday afternoon. Negative-tilted troughs are among the most concerning severe weather patterns during late spring and early summer because they often create exceptional wind shear, strong atmospheric lift, and highly favorable conditions for organized supercell thunderstorms.
Tuesday: Dakotas Into Southern Canada
By Tuesday afternoon and evening, severe thunderstorms are expected to develop across the Dakotas and extend northward into southern Saskatchewan and southern Manitoba.
The atmospheric environment may support:
Damaging wind gusts exceeding 60 mph
Very large hail
Intense supercell thunderstorms
Strong tornadoes
Long-track tornado potential in localized areas
When a negatively tilted trough interacts with rich Gulf moisture and strengthening low-level winds, storms can become highly organized and capable of producing significant severe weather over a large geographic area. The setup currently being forecast bears close monitoring due to the potential for multiple severe weather hazards occurring simultaneously.
Wednesday: Threat Shifts Into The Upper Midwest
As the trough continues to evolve, it is expected to close off into a powerful upper-level low moving into the Upper Midwest on Wednesday.
This evolution will likely trigger another round of severe thunderstorms from portions of:
Minnesota
Wisconsin
Iowa
Northern Illinois
The severe weather threat may again include damaging winds, large hail, and the potential for strong tornadoes. The exact corridor of greatest risk will depend on where the warm front and richest moisture become established, but the overall pattern supports another active severe weather day.
A Multi-Day Severe Weather Event
Unlike many spring severe weather episodes that last only a few hours, this setup has the potential to produce multiple rounds of severe weather over several days.
As the upper-level low slowly migrates eastward, severe thunderstorms may continue to develop through Thursday and possibly into Friday as the system moves from the Great Lakes toward the Northeast.
In addition to the tornado and wind threat, heavy rainfall and localized flooding may become increasing concerns later in the week as the storm system slows and interacts with abundant moisture.
Why This Pattern Is Concerning
Negative-tilted troughs are notorious for producing widespread severe weather because they maximize the interaction between strong upper-level dynamics and warm, unstable air near the surface. These setups frequently generate broad areas of severe thunderstorms and can support tornado outbreaks when moisture and instability are sufficient.
The forecast evolution next week is a classic example of a late-spring severe weather pattern, with a strengthening trough emerging from the West, becoming negatively tilted over the Plains, and then evolving into a large upper-level low over the Upper Midwest and Great Lakes.
Looking Ahead
The Tuesday through Friday timeframe will need to be watched carefully across the northern Plains, southern Canada, Upper Midwest, and eventually portions of the Great Lakes and Northeast. While details regarding exact storm locations will continue to evolve, the overall pattern strongly suggests an elevated risk for severe thunderstorms, damaging winds, large hail, and tornadoes over multiple days.
Residents across these regions should stay updated on the latest forecasts as confidence increases regarding the exact placement of the highest severe weather threat areas.