Millions of travelers will battle severe weather and busy highways Tuesday to reach their loved ones for Thanksgiving. And according to forecasters, it will be a cold period for many.

The National Weather Service (NWS) said in an update early Monday that a pair of weather systems were expected to cause an “Arctic outbreak” in Central America on Wednesday and Thanksgiving Thursday.

Temperatures in the northern Great Plains will only reach the high 20s on Tuesday and Wednesday, 15-25 degrees lower than the seasonal average. The NWS office for the Twin Cities said lows of zero to 13 degrees Fahrenheit were possible Thursday.

In central and southern California, the Great Basin and the Rockies, an atmospheric fluvial event — an airborne moisture flow that can cause heavy precipitation — would bring rain as well as up to three feet of snow in the southern Sierra Nevada.

It will be a wintery Thanksgiving for parts of the Upper Michigan Peninsula and areas downwind of Lake Ontario, with between 10 and 20 centimeters snow expected.

As of 7 a.m. Tuesday, airports appeared to be able to handle the influx of Thanksgiving travelers; there was just one flight cancellation listed on FlightAware’s Misery Map of airline disruptions nationwide on Tuesday morning, with just 55 delays.

Travel hubs also appeared to be able to cope with a rise in passengers on Monday. “I grew up in Connecticut, so I’ve been to this airport thousands of times and I’ve never seen it so easy to get through customs — no lines today,” said Father Jeff Couture, a Catholic priest who just returned from a pilgrimage. trip to Portugal, NBC New York told Monday.

Janis and Ken Allen flew to San Francisco from Newark on Monday to visit their daughter – after traveling by train from Philadelphia due to the lack of direct flights from there – and experienced no delays. They told NBC New York that they scheduled their return trip for Tuesday, December 3, to avoid the post-holiday crowds, as consumer travel groups including AAA have advised.