More than 50 million Americans from Texas to New York faced some type of weather warning as a major storm delayed flights and shut down roads.

►LaGuardia Airport in New York experienced a ground stop for the second morning in a row because of wintry conditions, and later reported average delays of more than 40 minutes.

But power outages and tree damage were still likely because of ice in the area, and officials warned that drivers should keep an extra flashlight, food and water in in their vehicles.

"The state of Texas is working around the clock to keep Texans safe and warm over the course of this severe winter weather and flooding event," Gov.

At least six people died on slick Texas roads, including a triple fatality crash Tuesday near Brownfield, about 40 miles southwest of Lubbock.

An ice storm warning was also in effect until Thursday in parts of east Arkansas, north Mississippi and west Tennessee.