A winter storm blanketed Forsyth County in snow overnight Sunday, closing schools, government offices and many businesses today and making travel treacherous.Snow, which has at times changed over to sleet and freezing rain, made many roads impassable. Those that were required extreme caution to navigate.Authorities were urging residents to stay off the roads unless there was an emergency.The Forsyth County school system made the decision to close Sunday afternoon as the storm barreled down on Georgia.The decision applied to all students and staff. In addition, any athletic events and extracurricular activities were also postponed.The winter weather also forced the closure of Forsyth County government offices and many businesses.