A Christmas Eve winter storm drenching Holiday Bowl fans and dropping varying amounts of rain countywide — and snow in the mountains above 4,000 feet — has departed leaving cool, dry conditions, the National Weather Service said Tuesday. “A very dry, continental air mass has now moved in,” NWS forecaster Joe Dandrea said. “Amounts were anywhere from a trace, to a few hundredths of an inch to as much as a half-inch or more,” he said. “Snow fell down to about 3,500 feet.” Rainfall amounts were about half an inch in Lakeside and Lemon Grove. El Cajon received 0.64 of an inch. Palomar Mountain got 0.77 of an inch.