BOSTON (AP) — It may officially be spring, but wintry weather blanketed the U.S. on Saturday with New England and California seeing a mix of rain, heavy snow and gusty winds. In the West, a winter storm warning was in effect through Sunday morning for parts of the Sierra Nevada, and a 91-mph (147-kph) wind gust was recorded at Mammoth Mountain near the California-Nevada line. About a foot (30 centimeters) of snow had fallen by Saturday morning north of Lake Tahoe. A winter weather advisory was issued through Sunday night for parts of northern Arizona, the Grand Canyon and Flagstaff to the New Mexico border with up to a half foot (15 centimeters) of snow possible at upper elevations and winds gusting to 40 mph (64 kph). The National Weather Service also warned of what it called a significant winter storm over central regions of the country through Monday. “The winter storm will be high-impact and an extensive system producing widespread heavy snow and gusty winds that will persist over parts of the Northern Plains and Upper Midwest,” the agency said in an online post. Heavy snow is expected to spread across central and eastern Montana and expand into the northern Plains and upper Midwest through Sunday and into Monday. There is a greater than 70% chance of at least 8 inches (20 centimeters) of snow moving from central South Dakota to northeastern Minnesota and northwestern Wisconsin, the weather service reported. Rain and strong winds are forecast for the Fond du Lac and Dodge County area Monday and Monday night.