Southern California is gearing up for a moist weekend as tropical moisture drifts northward. According to their latest update, the National Weather Service San Diego forecasts chances for showers from late Saturday through late Sunday, particularly favoring the mountains of San Diego County. The anticipated precipitation arrives amidst a small temperature dip, offering a brief respite from the heat, although the humidity accompanying the cooler air will maintain an elevated heat index in areas like the Coachella Valley.
The weather change is attributed to a cut-off upper level low hovering some 300 miles southwest of San Diego, this system is expected to fuel cloud coverage and bring light rain showers that could begin as early as Saturday afternoon, primarily over the elevated terrains; this information comes from an Area Forecast Discussion by NWS San Diego, even as coastal regions may see a mix of patchy low and high clouds leading to some sun. Models suggest scattered showers will persist, potentially growing sparse as the low-pressure area moves slightly northeast by Sunday morning, making room for remnants of Tropical Storm Alvin to feed more moisture into Southern California's atmosphere.
In the marine and beach segments, while no hazardous conditions are expected through Wednesday, a long period south swell will build up Sunday, affecting south and southwest facing beaches with elevated surf between 4 to 7 feet and increasing rip currents risk, the NWS San Diego projects that the surf will peak on Monday before tapering off again midweek. For aviation, intermittent showers might affect San Diego County beginning in the afternoon with a 10-20% chance at coastal and valley sites and increasing through Sunday morning, along with the possibility of outflow gusts over 20 kts in the mountains and deserts associated with these showers.
As Southern California braces for this weather event, temperatures will cool down further into Monday, falling slightly below seasonal averages, people in the region can expect a gradual warm-up starting Tuesday as high pressure moves back over the Pacific and into the area, heralding a return to more typical conditions for the time of year, these upcoming changes serve as a subtle reminder of the ebb and flow that characterizes our coastal climate, constantly influenced by the intricate dance of oceanic and atmospheric forces.
