A significant storm system has moved through San Diego County, bringing heavy rain and strong winds, with conditions expected to improve by Friday morning. The National Weather Service (NWS) reported that the main concern is the gusty and potentially damaging winds along mountain crests and desert slopes, leading to a wind advisory that remains in effect until at least 02:00 on March 15, 2024.
The NWS advised against driving in the mountains due to the combination of wind and heavy snow. “The combination of wind and heavy snow will make driving Thursday afternoon and evening in the mountains an unsafe adventure better left undone,” the agency noted in its forecast discussion. The storm could also trigger isolated thunderstorms, particularly in coastal areas and western valleys.
Throughout the storm, localized flooding has been reported due to heavy rain. The NWS projected an additional accumulation of 3 to 8 inches of snow in the county’s mountains from Thursday into Friday morning. Snow levels are anticipated to drop to between 3,500 and 4,000 feet, which could result in blowing snow and limited visibility.
In midweek reports, the storm delivered varying moisture amounts across the county, with precipitation totals ranging from just over a tenth of an inch to nearly six inches. Key measurements included 5.89 inches at Lake Cuyamaca, 4.78 inches in Julian, and 4.66 inches in Pine Hills. Other notable totals included 4.5 inches at Henshaw Dam and 3.93 inches on Birch Hill and Volcan Mountain.
In terms of rainfall over a 72-hour span ending at 10:00 on March 13, 2024, significant totals were recorded across various locations. For instance, 1.98 inches fell in La Mesa, 1.96 inches in Santee, and 1.88 inches in Rancho Bernardo. The detailed list also noted 1.16 inches at San Diego International Airport and 0.52 inches in Borrego Springs.
The storm’s impact was further highlighted by powerful wind gusts, reaching up to 76 mph in the mountains at Birch Hill and 80 mph in the inland valleys, as recorded early Wednesday morning. Winds of 52 mph were noted in the desert and 49 mph along the coast.
Looking ahead, the weather is expected to clear up from Friday through Monday, with temperatures rising to about five degrees above average. Although rain was initially expected to return mid-week, forecasts now indicate that this is less certain. The NWS encourages residents to stay updated on weather conditions as the situation evolves.
