A major storm out of the North Pacific will drench parts of Northern and Central California this week. But the system will fall apart by the time it gets to Southern California, producing only minute amounts of precipitation in San Diego County on Thanksgiving Day, says the National Weather Service. “San Diego will only get about one-tenth of an inch of rain between late Wednesday night through Thanksgiving Day,” said Joe Dandrea, a weather service forecaster. “The mountains could get a little more. Then things should mostly clear up.