Winter weather-related alerts were in effect across multiple U.S. states as of early Wednesday, with snowfall totals expected to reach up to 18 inches in some areas. Snowfall could lead to difficult travel and dangerous driving conditions across the affected regions, the NWS warned. Winter storm warnings were in place for parts of central California as of Wednesday morning. The NWS said the central Sierra, mainly south of I-80, could see heavy snow accumulations of 12 to 18 inches. “Snow levels