Today Partly sunny, with a high near 37. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.   Tonight Mostly cloudy during the early evening, then gradual clearing, with a low around 17. Blustery, with a northwest wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 35 mph.     Thursday Sunny, with a high near 32. West southwest wind around 10 mph.   Thursday Night A 30 percent chance of snow after midnight. Increasing clouds, with a low around 20. South wind 10 to 15 mph.     Friday A 50 percent chance of snow before noon. Mostly cloudy, with a high near 33. South wind 10 to 15 mph. New snow accumulation of less than a half inch possible.   Friday Night Partly cloudy, with a low around 13. Southwest wind 5 to 10 mph becoming west northwest after midnight.