LOS ANGELES (AP) – California’s roller coaster spring will bring more snow to the Sierra Nevada while the southern half of the state transitions from a mini heat wave to cooler weather with potentially damaging winds in the mountains.The National Weather Service says a cold, wet system moving through Northern California will rapidly lower snow levels Wednesday night to around 2,500 feet in Shasta County mountains and 3,000 feet in the Sierra. Forecasters say travelers heading over mountain passes should be prepared for winter driving conditions. Elsewhere, high wind warnings will go into effect from Sequoia southward through the mountains and deserts of Southern California, where winds could peak at 70 mph. Red flag warnings for fire danger are posted for the southeast corner of the state.