"Wintry driving conditions" -- when was the last time you heard that in an L.A. weather forecast? We'll be hearing a lot, nevertheless, over the next few days. The L.A. Daily News reports that "rain, snow, possibly thunderstorms and sharply lower temperatures" are on tap, beginning Thursday morning, thanks to a low pressure system gathering over the eastern Pacific. The News quotes a National Weather Service statement predicting snow levels to drop to 5,500 feet by tomorrow evening -- when the second of two storms is expected to hit. The second one should be colder and wetter -- possibly dropping up to three inches of rain on the Southland by Saturday.