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US: 40 million at risk of severe storms this week, "intense" tornadoes possible Monday
A significant severe storm outbreak is forecast for the Plains, Central U.S. and Ohio River Valley during the Monday to Wednesday time frame. Threat level: Storms could spawn "intense tornadoes," the National Weather Service warns, along with high winds, large, damaging hail and flooding. The greatest risk will come on Monday, when cooler, drier air from the west clashes with a fast-moving flow of warm, moist air flowing north from the Gulf of Mexico and spreading across much of Texas, Oklahoma, Kansas and Nebraska. The presence of strong winds aloft will help trigger severe thunderstorms, and give them the energy ... (full story)