This next clipper system receives some extra energy from upper air dynamics and a transfer to a coastal low pressure center. This setup could produce several inches of snow for our southern tier. Expect light snow to overspread the region from west to east early tomorrow morning (between 5AM and 8AM). Light to moderate snow should continue throughout the day and taper off sometime in the late afternoon hours. Expect a general 1-3" north of Harrisburg with a sharp cut-off to the precipitation. Some northern counties may only receive a coating to a couple of inches. The best chance to see several inches of snow will be from the Harrisburg metro area and south into Franklin, Adams, York, Lebanon, and Lancaster Counties. Expect 3-6" of accumulation for these areas. A heavier band of 6 to 9 inches could occur south of route 30 where snow may last into the evening hours. The snow will be light and fluffy as highs struggle to get above 20 degrees. The cold air will help the snow pile up during the afternoon, especially south of the Turnpike. Travel interests heading south toward the PA-MD border will need to be taken with caution as snow will be heaviest there.
Behind tomorrow's snow, expect cold air to arrive and linger through the end of the work week. Lows tomorrow night will fall into the single digits and not climb out of the teens for highs on Wednesday. Another clipper arrives Thursday with additional snow showers in the forecast.