An upper level disturbance is dropping into the Upper Midwest from the Canadian Prairies today. It’ll encounter unstable air by the afternoon hours, setting the stage for storms. Severe cells will break out in the late afternoon and move southeast towards Milwaukee and potentially Chicago this evening.
We’ve entered a typical summertime pattern of severe storms in the Plains. Clusters of storms forming in the late afternoon join together to produce a squall line in the evening. These “mesoscale convective systems” or MCS’s can pose a major high wind threat, often well into the overnight hours.
Over the weekend, Bluff Knoll in southern WA received a significant snowfall for the first time in years. Wednesday could bring more, and everybody is getting excited about it!
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So far this year, the Atlantic Basin has been mostly quiet of tropical systems. As we head further into the month of July, the threat for tropical disturbances gradually increases as environmental conditions becomes more favorable.