TONIGHT: Thickening clouds with snow developing closer to midnight; 1-3″ north of the Lehigh Valley, 3-6″ south. Low: 27. SATURDAY: Mostly cloudy and breezy with a few lingering snow showers. High: 35. SATURDAY NIGHT: Becoming mostly clear; brisk and cold. Low: 15. FORECAST SUMMARY. Ready or not, here comes more…