Debris fell onto Denver suburbs during an emergency landing after one of its engines suffered a catastrophic failure.
Fire Chief Jerry Bialick says hydrants are freezing, leaving firefighters with little water to put out fires.
The storms that have disrupted social distancing precautions and thrown people from different households together have also undermined the nation's vaccination drive.
The crew was overrun and had no time to deploy portable fire shelters.
Two people were caught in a collapse at an off-track betting site.
Investigation would focus on snow and ice treatment procedures.
The weather also threatened to affect the nation's COVID-19 vaccination effort.
A large water main break in Philadelphia left cars submerged and the area completely flooded.
All 33 passengers and one crew member died in the bunkroom below deck.
Searches for missing people were underway and will increase during the day.