Residents of Massachusetts are bracing for an impending winter storm that is poised to be the largest in years, with forecasts predicting snow accumulations of 12 to 20 inches in the Boston area alone. The National Weather Service has issued a winter storm watch from Sunday morning through Monday evening, warning of extreme cold temperatures that could create wind chills as low as -20 degrees in some regions. Local officials have declared a cold emergency and are activating winter storm protocols. As preparations ramp up, residents are advised to anticipate way-below-freezing temperatures and significant snowfall, making travel hazardous. With grocery shelves being emptied and salt supplies being mobilized in advance of the storm, authorities are urging caution as the region gears up for potentially historic snowfall and extreme conditions.