Winter Storm Fern spreads across the U.S., triggering flight cancellations, outages and emergency declarations

A multi-day storm with broad impacts

A powerful winter storm is moving across the United States, affecting a huge swath of the country with a mix of heavy snow, sleet and freezing rain. Forecasters warned that ice could be especially destructive, snapping tree limbs and power lines and making roads treacherous. The system has already produced widespread winter-weather warnings and prompted multiple states to declare emergencies as the storm intensifies and expands eastward.

Energy providers and grid operators have been preparing for prolonged strain as cold air increases demand for electricity and heating. Utilities in several regions warned customers that outages could last multiple days if ice accumulation becomes severe, and crews have been staged to respond once conditions are safe enough for repairs.

Travel disruption spreads from the Plains to the East

Air travel has been heavily disrupted, with thousands of U.S. flights canceled as the storm advances. Airlines have issued waivers and airports have faced staffing and de-icing challenges, while highways in some areas have been closed or restricted due to crashes and ice-covered surfaces. Officials have repeatedly urged residents to avoid unnecessary travel, noting that even a thin glaze of ice can turn roads into hazards.

The storm has also affected daily life beyond transportation. Schools and local offices in some impacted areas have announced closures or remote operations, while retailers and delivery platforms have adjusted services to account for worker safety and changing conditions.

Cold-related risks and emergency response

Alongside the snow and ice, the cold itself has become a primary danger. Officials cautioned that wind chills can be life-threatening and that people without adequate shelter are at particular risk. In some places, reports of deaths tied to exposure underscored the seriousness of the cold snap even before the storm’s most intense precipitation reached the East Coast.

Emergency management agencies have activated response measures, including coordination with federal resources. Local leaders have emphasized practical preparations: checking heating systems, stocking essentials, keeping phones charged, and avoiding travel during the worst conditions. Residents in areas prone to ice-related outages were encouraged to plan for the possibility of losing power and heat.

What to watch next

• Ice accumulation: even modest ice loads can cause widespread tree and power-line damage.
• Rapid temperature drops: refreezing can occur after precipitation ends, prolonging road hazards.
• Restoration timelines: repairs can be slowed by dangerous conditions and blocked roads.
• Continued travel impacts: additional cancellations are likely as the storm reaches more major hubs.

With the system expected to continue east and northeast, forecasters say impacts may evolve quickly by location. Officials continue to recommend monitoring local alerts, avoiding travel when advisories are issued, and taking precautions against cold-related illness while the storm persists.