Arctic air in Midwest to move east

Associated Press

MINNEAPOLIS

The upper Midwest was in the deep freeze Tuesday, with the arctic air expected to shift eastward and affect millions of people as the week wears on.

The National Weather Service posted advisories for the Dakotas and Minnesota, with wind chills from 10 to 20 below zero.

Wind chill is the combination of air temperature and wind, and forecasters say wind chills this cold can cause frostbite to exposed skin in as little as 30 minutes.

Dense morning fog over much of Texas slowed the commute for motorists and delayed flights at Dallas-area airports.

Fog also impaired visibility in the Austin, Houston and San Antonio regions, and the National Weather Service issued a dense fog advisory for many parts of the state.

In Indiana, snow falling at rates of more than an inch per hour caused poor travel conditions, including along the Interstate 70 corridor.

The state Department of Transportation deployed nearly 500 snowplows and trucks statewide.

The cold will affect parts of the northern and eastern U.S. later this week and into the weekend, with low temperatures expected in the Great Lakes, Mid-Atlantic and Northeast regions, according to Climate Prediction Center forecaster Stephen Baxter.

In the Mahoning Valley, the forecast calls for the low tonight to be 8 degrees above zero with wind-chill values as low as 8 degrees below zero after midnight.