Several flights were affected by weather conditions, with rain and snow expected in the Pacific Northwest through Christmas Day. Thunderstorms were also developing in the South, freezing rain was reported near Baltimore and Washington, and snow was falling in New York.

As travelers prepare for their Christmas and New Years trips, here are some things for those flying in or out of Portland International Airport to know. How busy will the PDX airport be on Christmas Eve and Christmas Day?

While Americans on the east coast brace for snow, on the west coast some are facing flooding and high surf warnings.