US climate – The storm will not only keep conditions cool for the unofficial start of summer but could also trigger travel-disrupting rainfall over the holiday weekend.
The storm is forecast to arrive along the Pacific Ocean then push across the northern third of the western United States into Tuesday night. It will trigger showers and spotty thunderstorms as it moves along. As this system pushes east of the Rockies on Wednesday, it is likely to become energized.
The storm will tap into moisture from the Gulf of Mexico as it moves eastward along a zone where clashing air masses — with cooler air to the north and hot and muggy air to the south will collide. It will advance across the Midwest Wednesday into Thursday and then the central Appalachians and mid-Atlantic Friday into Saturday. Eventually, the cool air will sweep southward in the wake of the storm with relief for those in the Southern states enduring an early-season heat wave.
On the storm’s cool northern side, clouds are expected to be thick, and steady rain is forecast to fall for a time. Where the steadiest rain falls will depend on the exact track of the storm.As the storm shifts across the northern Plains, the steadiest rain is likely to fall on drought-stricken areas bounded by Interstates 90 and 94, which includes portions of eastern Montana, the Dakotas and southern Minnesota Wednesday to Wednesday night.
Then, a large complex of severe thunderstorms is forecast to develop just south of the steady rain area and could hit areas along I-80 especially hard in Nebraska and Iowa from Wednesday afternoon to Thursday morning.
On Thursday, the rainy portion of the storm is forecast to push through the Midwest. Cities such as Minneapolis, Chicago and Milwaukee are expected to pick up at least some rain from the storm.
reference – accuweather
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