Key keywords: Western New York weather, 48-hour dramatic weather shift, NWS Buffalo forecast, lake effect snow warning, fall temperature plunge, Western New York travel advisory, sudden frost alert, Great Lakes lake effect precipitation The National Weather Service (NWS) Buffalo office issued a formal public alert Wednesday morning confirming that Western New York will face an unprecedented sudden weather shift over the coming 48 hours, ending an unseasonably warm 10-day stretch that saw daytime highs hover between 17 and 21 degrees Celsius (63 to 70 degrees Fahrenheit) across most of the region. The first 12 hours of the shift will bring heavy, sustained rainfall across Erie, Niagara, Chautauqua, Cattaraugus, and Allegany counties, with total rainfall accumulation expected to hit 25 to 50 millimeters (1 to 2 inches) in most areas, and up to 75 millimeters (3 inches) in higher elevation zones south of the Southern Tier Expressway. Local emergency management teams have already issued flood watches for low-lying areas near creeks and Lake Erie shorelines, warning residents to move vehicles and valuable property out of flood-prone zones before the rain begins Wednesday evening. By Thursday morning, a fast-moving arctic cold front will cross the region, pushing daytime highs down to just 2 to 5 degrees Celsius (36 to 41 degrees Fahrenheit), with overnight lows dropping below freezing to -2 degrees Celsius (28 degrees Fahrenheit) by Thursday night. The sharp temperature drop will turn residual rain into lake effect snow late Thursday, as cold northwest winds blow across the relatively warm waters of Lake Erie, picking up moisture that will fall as snow across the southern and eastern suburbs of Buffalo, and throughout Cattaraugus and Allegany counties. NWS meteorologists project total snow accumulation of 7.5 to 15 centimeters (3 to 6 inches) in most affected areas, with up to 25 centimeters (10 inches) of snow possible in hills above 400 meters (1,300 feet) elevation. Winds accompanying the cold front will hit gusts of up to 80 kilometers per hour (50 miles per hour) through Thursday evening, raising risks of downed tree branches, power outages, and dangerous travel conditions on local highways including Interstate 90, Interstate 86, and the full length of Route 219 along the Southern Tier. The New York State Department of Transportation has pre-deployed salt trucks and snow plows across the region, but has advised residents to avoid all non-essential travel between Thursday afternoon and Friday morning, when black ice will be common on untreated roads. For local agricultural operators, the sudden freeze warning poses a major risk to unharvested crops including late-season apples, winter wheat seedlings, and remaining market garden produce, with extension officers advising farmers to apply protective coverings or accelerate harvest schedules where possible. Local school districts and community event organizers have already begun announcing cancellations for Thursday and Friday, including multiple high school football playoff games, regional farmers markets, and outdoor charity walks. The NWS has urged all residents to prepare emergency kits with at least 72 hours of food, water, warm clothing, and backup power supplies for mobile devices and medical equipment, and to check on elderly or vulnerable neighbors who may need support during the weather event.