New York state mountains took advantage of a pre-winter storm to start the season — or snowmaking machinery — last weekend. Many more join the parade Thanksgiving Weekend. You're welcome. Belleayre punched the season open with one trail, and other Catskills and Adirondacks resorts eyed Thanksgiving weekend as T-Day — takeoff day. Whiteface Mountain in the Adirondacks and Windham Mountain in the Catskills are two that planned to launch over the holiday weekend, luring vacationers, visitors and would-be season passholders with preseason deals.