Wildfires swept across the Texas Panhandle early Wednesday, prompting evacuations, cutting off power to thousands, and forcing at least the temporary shutdown of a nuclear weapons facility.

The nor'easter struck the Northeast on Monday evening and is pushing east. Heavy snow and strong winds have disrupted travel and affected millions of residents with road and school closures.

The numbing cold is expected to ease in the coming days as water systems in Memphis and other Tennessee cities battle broken pipes that have caused boil-water notices.

Temperatures plunged below zero in parts of Tennessee, creating the largest power demand ever for the Tennessee Valley Authority. The icy blast stretches from Oregon to the Northeast.

A winter weather advisory is in effect until noon today, with a wind chill advisory in effect through Wednesday amid below-freezing temperatures and wind chills below zero.

Through this weekend, the first significant arctic outbreak of winter will affect most of the country. Wind, flooding rain, and some tornado warnings have been issued across the U.S.

A storm packing heavy rain was sweeping through the Northeast early Wednesday, while winter weather brought tornadoes in the Midwest and South, flood threats in Florida and blizzards in the Northwest.

The historic heat began blasting the Southwestern U.S. in June, stretching from Texas across New Mexico and Arizona and into California's desert.

A tornado touched down Wednesday evening near Chicago's O'Hare International Airport, prompting passengers to take shelter and disrupting hundreds of flights. There were no reports of injuries.

Unhealthy air quality grips the East Coast reaching as far south as North and South Carolina.

The Sierra Nevada region where the park is located experienced snowfall at over 300% than usual this past winter. Flooding may happen into May and June, the park said.

Red flag warnings mean an increased risk of wildfires in the next 12 to 24 hours, so fire safety is extra important. How do they differ from fire weather watches? And what precautions should you take?

The area received between 14 and 20 inches of rain Wednesday, and a few more inches are possible, according to the National Weather Service.

Storms have been sweeping across California since last December. Areas with high elevation are forecasted to experience the brunt of this week's extreme weather.

Western Mississippi is turning to recovery after being hit by a long-track tornado on Friday. Here's what made it so destructive — and why the impact of climate change on tornadoes is still unclear.