Dangerous conditions left thousands stranded and many more without power as Winter Storm Blair dropped record-breaking snowfall over parts of the US. Hard freezes are expected to reach as far south as Florida.

• Storm Blair has caused travel disruption in several states.
• More than half of flights were canceled at Ronald Reagan Washington National Airport on Monday.
• 94% of flights were canceled in Kansas City, Missouri, on Sunday.

More than half of flights were canceled at Washington, DC's Reagan National Airport on Monday, according to data from FlightAware, as Storm Blair brought snow and ice to a large part of the country.

The winter storm has triggered a state of emergency in Arkansas, Kansas, Kentucky, Missouri, Virginia, West Virginia, and parts of New Jersey.

FlightAware data showed 1,339 flights within, into, or out of the US were canceled on Monday as of 6:30 a.m. ET.

Reagan National Airport appeared to be the worst hit with 229 cancellations, equivalent to 58% of all flights scheduled there for Monday.

Nearby Baltimore/Washington International and Washington Dulles airports were also affected, with 38% and 25% of flights canceled respectively on Monday.

The National Weather Service warned that the DC area could face between 5 and 10 inches of snow, with a winter storm warning in effect until 1 a.m. ET on Tuesday.

Republican House Speaker Mike Johnson told Fox News that the formal certification of Donald Trump's election as president will still go ahead on Monday.

In Cincinnati, where the National Weather Service predicts up to four inches of snow, one-third of Monday's scheduled flights were canceled, FlightAware data showed.

More than 1,800 flights were canceled on Sunday, per FlightAware.

Heavy snowfall was also recorded in Kansas City, Missouri, where local media reported 10 inches fell on Sunday night. According to FlightAware, 94% of flights were canceled there on Sunday.

Airports in Indianapolis and Kentucky also saw rates of cancellation above 20% on both Sunday and Monday.