A very active weather pattern is unfolding across North America this week, featuring severe thunderstorms, heavy rainfall, and flooding risks from the Plains to the Great Lakes, while record-breaking heat expands across the East Coast. Meanwhile, winter-like conditions return to the Northwest and Rockies, and critical fire weather concerns develop in the High Plains. Outside the mainland U.S., Super Typhoon Sinlaku is expected to bring dangerous conditions to the Marianas through midweek.
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An active and impactful weather pattern is setting up across much of North America through next week. Multiple rounds of severe thunderstorms are expected from the eastern Canadian Prairies, U.S. Plains into the Mississippi Valley, bringing the risk of damaging winds, large hail, and tornadoes. Heavy rainfall may lead to localized flooding from the Northern Plains to the Southeast, while wildfire concerns continue across the Four Corners region. At the same time, summer heat is building, with the East experiencing its hottest temperatures of the season late this week before above-average warmth expands westward during the weekend.