Snow fell a foot deep in the Ohio Valley and snarled traffic and closed schools into New England from a storm that left a white, icy trail all the way to New Mexico. A new wave of cold air washed from the Canadian border into Texas, plunging temperatures there to a record-tying low of 12 degrees below zero. It was the second snowstorm in five days for much of the Northeast. At least 11 people have died this week in accidents blamed on the weather. The storm also spawned tornadoes late Monday in Georgia that destroyed homes and caused several injuries.