Midweek brings flash flooding and severe storm risks from the Mid-Atlantic to Texas, followed by building heat across the central and eastern U.S. heading into the holiday weekend. Florida and the Upper Midwest also face stormy, soggy days ahead. Air quality is an issue throughout central Canada related to the wildfires, plus heat warnings are issued for parts of Alberta this week.
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A strong Pacific storm will drench Northern California through midweek. An Arctic front follows this weekend with much colder air and a wintry mix for parts of the Great Lakes, Northeast, and Northern Plains.