Thanksgiving is a time for homecomings, but if your travel plans involve flying, you might want to brace yourself for some rough weather. There’s a brutal system moving across the country, and it’s looking to make Tuesday and Wednesday travel a potential nightmare. A wet, cold Nor’easter will creep along the East Coast, dishing out snow, wintry mixes, 2-4 inches of rain and general unpleasantness on roads and airports, with some snow flurries following in its wake. So, travel safely, everyone, and bring your kindest, most patient spirit wherever your journeys may take you. Or strand you …