The National Weather Service issued a Winter Storm Warning for Pine Valley and the San Diego County Mountains, in effect from Sunday evening until Monday evening. * Severe weather conditions are expected, including heavy snow20 * Damage to trees and power lines is possible20 * If you must travel, plan on difficult travel conditions20 * Keep an extra flashlight, blanket, food, and water in your vehicle in case of emergencyMore forecasted information and updates are available from the National Weather Service . Follow @SDCountyDPW on Twitter for updates on County road closures and @SDCaltrans for updates on freeway closures.