Washington Dulles International Airport had to close down one of its main security checkpoints on Monday morning due to a high volume of Transportation Security Administration workers who called out of work, just as many other airports across the country have had to do since the partial government shutdown began 23 days ago.

About 51,000 TSA agents have been working without pay—or simply not allowed to come to work at all—during the shutdown. Miami International Airport has had to shut down an entire concourse early for three days due to TSA call-outs.

But spokespeople for both TSA and the Metropolitan Airports Authority tell DCist that the callouts aren’t federal shutdown-related—they’re because of the weather. In case you hadn’t noticed, a blanket of snow (10 to 12 inches in many places) is blanketing the Washington region, and commutes this morning weren’t exactly a piece of cake. “We had callouts because of the weather, so we consolidated operations at Dulles,” says TSA spokesperson Thomas Kelly. The agency advised in an email statement this morning that passengers should contact their airlines, as flights could be affected by the consolidation.

A spokesperson for the Metropolitan Airports Authority told DCist that the airport expects to be able to re-open all lanes and security checkpoints this afternoon. Across the country on Monday, TSA had a 7.6 percent callout rate compared to a 3.2 percent callout rate on the same date last year, according to the agency.

Neither Reagan National Airport nor Baltimore-Washington International Airport had a high enough callout rate to necessitate any lane closures, says Kelly.