A winter storm heading toward the Tri-State area could produce heavy rain and even snow for parts of New York state, snarling travel for millions of people during the Thanksgiving holiday.

A storm that was pounding California's Sierra Nevada with snow Tuesday took aim at the Colorado Rockies and could roll east and slam the Appalachians on Thanksgiving Day, bringing unsettled travel weather to millions of Americans hitting the skies and roads for the holiday weekend.

The National Weather Service has issued a winter storm watch for parts of southern Vermont and New Hampshire, in effect through Thanksgiving into early Friday.