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A big-time warmup is forecast for two-thirds of the country on Tuesday, with temperatures 10-20 degrees above average.  

US TEMPERATURES SET TO REBOUND THIS WEEK

Temperature rollercoast across the U.S.

Temperature rollercoast across the U.S. (Credit: Fox News)

On Wednesday, cooler air will start to sink in across the central U.S.

Western rain forecast

Western rain forecast (Credit: Fox News)

Meanwhile, the West is still very active, with coastal rain and mountain snow from the Northwest down into California.  

Snow forecast for the West

Snow forecast for the West (Credit: Fox News)

As this system shifts over the central U.S., stronger storms will develop on Wednesday.

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Rain forecast for the central U.S.

Rain forecast for the central U.S. (Credit: Fox News)

There are chances of severe weather and some wintry precipitation as colder air moves in from Canada