A powerful storm system that tore across the United States in recent days is poised to move offshore into the Atlantic Monday, but in its wake are devastated communities across multiple states that were hit with violent tornadoes,

The dynamic storm from Friday through Sunday had earned an unusual “high risk” designation from weather forecasters.

In some extreme cases, thunderstorms can spawn a derecho, a long-lived windstorm with gusts over 100 mph, strong enough to cause widespread destruction. If a severe thunderstorm warning mentions damaging winds or a derecho, take cover immediately—just as you would for a tornado.

A severe storm on Monday swept through the U.S. Southeast and Mid-Atlantic, bringing thunderstorms, hail, damaging winds and the potential for tornadoes. Days earlier, the same ferocious weather system spawned violent twisters,

The weakening but still volatile weather system was moving Monday into the US Southeast and Mid-Atlantic, bringing thunderstorms, hail, damaging winds, and the potential for more tornadoes.

President Donald Trump has activated the National Guard in tornado-struck Arkansas after storms ripped through multiple states over the weekend, leaving at least 37 dead.

Multiple people have died amid an outbreak of severe weather across the South that forecasters warn could include "violent" tornadoes, high winds, thunderstorms and flash flooding on Saturday. Two people died and others were injured in a suspected tornado that touched down in the Bakersfield area of southern Missouri,