On the heels of widespread thunderstorms that rattled several areas of the United States late in the week, an outbreak of severe thunderstorms is poised to strike portions of the northern Plains and southern Canada this weekend.
The combination of a storm moving onshore in the Pacific Northwest and a strong disturbance at the jet stream height of the atmosphere, the level at which jets usually cruise, could cause thunderstorms to erupt from portions of the northern Rockies to the adjacent High Plains in Wyoming, Montana, western Nebraska and the Dakotas. The stormy weather could unfold as early as Friday night.
The storms will erupt on the northern rim of building heat to the south, and the main threat from severe weather will come during Saturday afternoon and night as strong winds aloft develop over an area where temperatures and humidity levels will surge.
“Essentially, much of the northern High Plains to portions of southern Saskatchewan and southeastern Alberta, Canada, will be at risk from later Saturday to Saturday night,” AccuWeather Canada Weather Expert Brett Anderson said. Anderson has been forecasting the weather in North America for 31 years at AccuWeather.
“June and July are the prime months for severe storms over the northern tier of the U.S. and the southern tier of Canada,” Anderson said.
“This is because the jet stream has finally retreated to the north, and this area often represents a zone of marked temperature and humidity contrast,” he explained.