Today Snow, mainly before 4pm. High near 21. Southeast wind 5 to 15 mph. Chance of precipitation is 90%. Total daytime snow accumulation of less than a half inch possible.   Tonight A chance of snow and sleet before 4am, then a chance of sleet between 4am and 5am, then a chance of snow after 5am. Cloudy, with a low around 18. Southeast wind 5 to 15 mph. Chance of precipitation is 50%. New snow and sleet accumulation of less than a half inch possible.     Tuesday A 50 percent chance of snow before 1pm. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 17 by 5pm. West northwest wind 5 to 15 mph, with gusts as high as 25 mph. New snow accumulation of less than a half inch possible.   Tuesday Night A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 3. West wind 5 to 15 mph becoming southeast after midnight.     Wednesday A 20 percent chance of snow before 7am. Mostly cloudy, with a high near 10. North northwest wind around 10 mph.   Wednesday Night A 30 percent chance of snow after 7pm. Mostly cloudy, with a low around -1. North wind around 10 mph.