The National Weather Service issued a weather alert at 2:02 a.m. on Saturday for heavy snow until 3 a.m. for Berks, Lehigh, Northampton and Bucks counties. “At 1:57 a.m., a band of heavy snow was located along a line extending from central Berks County, the Lehigh Valley, and upper Bucks County eastward into New Jersey toward Raritan Bay. Movement was east at 15 mph. Snowfall rates of 2 to 4 inches per hour have been observed with this band and roads have become snow covered,” says the weather service.