The weather service said "life-threatening cold temperatures and dangerous wind chills will create a potentially life-threatening hazard for travelers that become stranded" or people who work outside.
Nationwide, thousands of flights were canceled or delayed. In some places, temperatures dropped more than 30 degrees in an hour. Wind chills reached well below zero. Inches of snow fell.
A destructive winter storm marched across the U.S., delivering blizzard-like conditions to the Great Plains hours after tornadoes touched down in parts of Texas, Oklahoma and in Louisiana.
A winter storm packing powerful winds, heavy rain and potentially several feet of snow in the Sierra Nevada shut down highways, toppled trees and triggered flood watches and avalanche warnings.
More than 100,000 homes and businesses lost power and thousands of flights were canceled as states from New Mexico to Maine were placed under winter storm warnings and watches.
The National Weather Service predicts a prolonged, major winter storm that could travel across parts of the Midwest into the Northeast later this week.
A bomb cyclone is storming the East Coast, leaving close to 100,000 without power as of Sunday night Blizzard conditions in New England are dropping 2 feet of snow in some areas.
Homes and businesses across New York, Ohio and Pennsylvania were without power as a dangerous storm brought heavy snow, strong thunderstorms and blustery winds.
The state agencies in charge of responding to weather emergencies are bracing for a winter storm expected to hit North Georgia and metro Atlanta during a three-day holiday weekend.
The Texas Department of State Health Services adjusted the number of people who died from last February's storm to 246 people — up from July's tally of 210.
Lingering effects of the storm are expected to cause dangerous conditions though early Monday as residents dig out from under the weekend's record breaking levels of snow.
Cristian Pavon died last Tuesday when the local temperature was 12 degrees, according to a relative who set up a fundraising page for his family.
Houston area residents are reporting exorbitant prices of food, water, and hotel rooms while the state continues to deal with shortages of essential items after a winter storm hit the state.
The nonprofit Sea Turtle, Inc. says it has brought in nearly 4,500 sea turtles and counting since Sunday. Still without power, it's heating its tanks with a commercial generator donated by SpaceX.
Missouri has canceled all state-run mass vaccination events for the week, as other states and cities across the South reschedule appointments and warn of delayed shipments.