A system plowing through the country is expected to spark rain and thunderstorms over an area from the Great Lakes to the Gulf Coast, with dangerous severe storms possible from the southern Ohio Valley through Louisiana. 

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Damaging winds, flash flooding, hail and tornadoes can all occur. It will be cooler and windy in the wake of this system throughout the Plains states. 

Meanwhile, high pressure will promote widespread clear, calm and increasingly warm conditions throughout the western United States. 

Unsettled weather around Puget Sound will keep the Seattle area cooler and damp, however. 

DAILY EXTREMES 

National High Wednesday 92 at Laredo, TX 

National Low Wednesday 0 at Bodie State Park, CA