"Heavy coastal and mountain rain may lead to instances of flash flooding, particularly over the windward foothills of the southern Sierra Nevada below 8,000 feet, where excessive rainfall may cause land/rock/mudslides," the NWS said in a forecast Tuesday morning.

Two separate storm systems carrying heavy rain are expected to impact the busy Thanksgiving holiday travel in New York City, and the second one could even bring some snow to parts of the Tri-State area.

That's because of "another atmospheric river event" that will bring copious rainfall to coastal and valley locations and 3 to 4 feet of snow to the Sierra, forecasters said. The storm will move into the Rockies by midweek: "One tricky travel area will be in and around the Denver area as snow spreads across the area on Wednesday,

As of Monday morning, multiple states and territories have been issued warnings about incoming storms that could potentially affect road and air travel. Rain and snow are expected to significantly impact the West Coast this week while a windswept storm carries over the Northeast.

While the exact track and intensity of the Thanksgiving Day storm are still being ironed out, it's looking like a rain event for most of southern New England. Here's what the weather looks like for the holiday and busy travel days.

Atlanta can expect widespread rain for Thanksgiving, with arctic air pushing lows into the 20s after the holiday.