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Damaging storms to roar to life across northern US

By Mary Gilbert, AccuWeather meteorologist

Published Jul 17, 2022 11:05 AM EDT | Updated Jul 18, 2022 9:43 PM EDT

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After almost daily rounds of severe thunderstorms targeted portions of the northern tier of the United States at the beginning of the month, these same areas experienced a brief break from damaging storms in recent days. However, AccuWeather forecasters say a renewed threat for damaging storms will rumble to life across the northern tier of the United States early this week.

The threat for feisty thunderstorms began on Monday afternoon across a wide swath of the northern U.S. and the southern tier of Canada as a disturbance in the upper levels of the atmosphere swung into the area. Energy associated with this disturbance will prime the atmosphere for explosive storms, especially toward evening and the overnight hours.

"The severe threat will begin as a cluster of storms moves through northern Montana and North Dakota, as well as adjacent portions of Canada," AccuWeather Meteorologist Andrew Johnson-Levine said.

Storms are initially forecast to develop from Montana to southern Saskatchewan, Canada, and generally track eastward into Monday night. By the middle of the night, severe storms are likely to be pushing across southern Manitoba and North Dakota.

Over 1.5 inches of rain was reported over the Monday late afternoon hours outside of Calgary, with rainfall totals also rising throughout Montana as a result of the storms.

A separate area of storms, more spotty in nature will occur farther to the east in portions of northern Minnesota and Wisconsin as well was Michigan's Upper Peninsula.

"Hail and damaging winds will be the main concerns," Johnson-Levine explained.

In Montana, late last week, strong winds within a severe thunderstorm set off a dust storm that led to multiple fatalities on Interstate 90.

Forecasters are concerned that the atmosphere will be primed to unleash large hail Monday evening, as storms track across the region. An area that stretches from northern North Dakota to southern portions of Saskatchewan and Manitoba, Canada, will be at the greatest risk for this damaging hail. Hailstones can grow to the size of golf balls or larger in the most robust storms before plummeting to the surface.

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The threat for severe weather on Tuesday will depend highly on how severe thunderstorms develop and where storms ultimately move through Monday night.

"With a surge of heat and humidity along the northern edge of the continuing heat dome, severe storms are likely once again on Tuesday," Johnson-Levine explained.

Forecasters have pinpointed an area that stretches from Minnesota, Wisconsin and Michigan north into southeastern Manitoba and southern Ontario for severe thunderstorms on Tuesday. In the westernmost portion of the area of concern, thunderstorms are likely to arrive early Tuesday after trekking across the Dakotas and portions of Manitoba Monday night.

"The highest likelihood of severe weather will be where the most moisture is found," Johnson-Levine explained. "To the south, scorching heat will stifle any chance of a thunderstorm, while toward the north, the heat and humidity necessary for thunderstorms may not be present. Where the ingredients best line up, numerous intense storms will be possible."

Where storms do roar to life on Tuesday and Tuesday night, a myriad of concerns exist, including torrential rainfall, hail and damaging wind gusts. Forecasters say thunderstorms will be able to produce wind gusts on the order of 65-75 mph (105-120 km/h) with an AccuWeather Local StormMax™ of 90 mph (145 km/h).

Areas at risk for potent storms on Tuesday include cities like Thunder Bay, Ontario; Duluth, Minnesota; and Marquette, Michigan.

By midweek, AccuWeather forecasters say the threat for drenching thunderstorms will shift away from the North Central states and push into portions of the Great Lakes and Northeast.

While any heavy rainfall in these regions may lead to flash flooding concerns from midweek on, precipitation is sorely needed as portions of the area work to stave off abnormal dryness and drought concerns.

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