San Diegans are in for a continuation of scattered showers and the possibility of thunderstorms. Residents and visitors in the mountains and high deserts should watch this Friday afternoon for increased chances of locally heavy rainfall as monsoonal moisture prompts atmospheric instability, according to the latest National Weather Service San Diego updates.
The convection seen this morning has so far only produced a few hundredths of an inch of rainfall, with the presence of a dry sub-cloud layer limiting precipitation to the ground. The National Weather Service's Area Forecast Discussion from the National Weather Service notes that "This morning...Scattered showers and isolated tstms continue to move westward," moving most prominently through areas from the high deserts to the coastal waters.
Forecasters anticipate a change this evening as swatches of marine layer low clouds disrupt alongside the convection. The upper low is expected to move north, gradually reducing the strength of the showers and thunderstorms. Fog patches will likely develop, resulting in extensive low clouds tonight into Saturday morning, casting an overcast complexion across the valleys and the coast.
Looking ahead to Sunday, residents can anticipate returning to drier conditions as "southwest flow aloft" ushers in greater stability, ending the stretch of monsoonal moisture and bringing a more predictable weather. "By Sunday, we lose most of the monsoonal moisture," the National Weather Service conveyed, signaling the end to the thunderstorm threat for the early part of next week. A persistent marine layer should be anticipated to enshroud the coastal areas and valleys each night and morning, keeping temperatures close to seasonal averages.
Maritime activities are expected to remain largely unaffected by the weather, with a very slight chance of thunderstorms noted for coastal waters. Beachgoers should be aware of a continued, though minimal, risk of lightning and thunderstorms during early morning hours. Skywarn activation is not requested, yet the National Weather Service encourages voluntary weather reports for significant weather observations.
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