Millions of Americans across the country are on alert for a severe weather outbreak as violent, long-track tornadoes with damaging winds of up to 80 mph and large hail are expected across the Midwest and South with the cross-country storm moveing east.

At least 18 people are dead after severe weather hit parts of Missouri, Texas and Arkansas overnight, officials said.

Millions of Americans across the country are on alert for a severe weather outbreak with violent, long-track tornadoes with damaging winds of up to 80 mph and large hail{ai:summary}<p>Severe weather is threatening millions in the Midwest and South, with long-track tornadoes and winds up to 80 mph expected. At least 18 fatalities have been reported in Missouri, Texas, and Arkansas due to the overnight storms. </p><p>#society</p>

Tornado outbreak live updates: At least 18 dead as severe storms hit South, Midwest

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