TONIGHT…Showers with isolated thunderstorms. Much cooler with lows in the lower 40s. North winds 5 to 10 mph. Chance of rain near 100 percent. SATURDAY…Partly sunny. Isolated showers in the afternoon. Highs in the upper 50s. West winds 10 to 15 mph. Gusts up to 30 mph in the afternoon. Chance of rain 20 percent. SATURDAY NIGHT…Partly cloudy in the evening, then becoming mostly clear. Patchy frost after midnight. Lows in the mid 30s. West winds 10 to 15 mph.