If you or anyone you know plans to fly out of BWI-Thurgood Marshall Airport tonight or on Tuesday, it may be worth finding other shelter and giving the airline a call.

FlightTracker.com calculates 109 flights entering or leaving BWI today have been cancelled, with 75 already delayed. On Tuesday, 492 flights have been cancelled as of 4 p.m. today.

BWI’s website shows most departures for tonight are on time or delayed leading up to 8:30 p.m., with most cancellations starting thereafter. Of the 28 flights that are supposed to leave BWI after 8:40 p.m., only seven are listed as “on time” or “delayed” (as of 3:50 p.m.) Nearly all of the flights that have been cancelled are operated by Southwest Airlines, the airport’s largest flight carrier.

The forecasts keep changing, but as of this afternoon, the National Weather Service predicts four to eight inches of snow will fall on Baltimore and the surrounding area between 7 p.m. tonight and 2 p.m. tomorrow. BWI is staying prepared, with snow plows at the ready:

#BWI personnel and equipment are prepared for winter weather. Travelers should be in touch w/ airlines for flight info. #MDOTnews #snow pic.twitter.com/410esChf0h

— BWI Marshall Airport (@BWI_Airport) March 13, 2017

Southwest has already issued a travel advisory and is already offering passengers the opportunity to exchange flights at no extra cost.

Check here to keep track of flights going into and out of Baltimore.

Ethan McLeod is a freelance reporter in Baltimore. He previously worked as an editor for the Baltimore Business Journal and Baltimore Fishbowl. His work has appeared in Bloomberg CityLab, Next City and...