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The state straddles Tornado Alley and has had a number of especially strong twisters leave a path of death and destruction in their wake.

Tornado strength is currently measured on what is called the Enhanced Fujita Scale, which gives the tornado a rating from 0 to 5 based on estimated wind speeds and the severity of the damage.

Robert Siegel talks to Joe Wertz of the public radio initiative State Impact about the tornado that hit the Oklahoma City area on Monday.

Helicopter images of Moore, Oklahoma show tracts of devastated neighborhoods.

From Texas to the upper Great Lakes, forecasters are warning that the weather will be rough Monday, Tuesday and Wednesday. Tornadoes are possible in the Plains States. Elsewhere, severe thunderstorms — some with hail — are likely. In Oklahoma, two people have died from storm-related injuries.

A series of twisters roared through North Texas on Wednesday night. In Granbury, about 35 miles from Fort Worth, neighborhoods were devastated. The search continues for victims.

The National Weather Service says the system is threatening to bring severe weather from the Tennessee Valley all the way to the Gulf Coast, tonight. It will move east Friday.

A tornado touched ground near Adairsville, Ga., leaving major structural damage and at least one death. The severe weather will continue to move east, affecting areas from New York to Pensacola.

The American College of Emergency Physicians and FEMA are hoping to teach children what to do before, during, and after disasters using their online game, Disaster Hero.

Twisters touched down across the Southeast. Heavy snow and rains toppled trees and power lines. At least six deaths are being attributed to the massive system's effects. Now, it's hitting the Northeast. Hundreds of flights have been canceled. Drivers are being warned to stay off many roads.