As Southern Californians brace for another warm day, the National Weather Service in San Diego has highlighted that high temperatures on Monday will remain significantly above normal, ranging from 10 to 20 degrees higher. The forecast indicates a slight reprieve is on the horizon, with cooling anticipated to spread inland through Sunday. However, inland valleys and lower coastal slopes of the mountains are still expected to experience Sunday highs 12 to 18 degrees above average, according to a report by the NWS San Diego.
The weekend's weather pattern is described by NWS as a gradually weakening high pressure aloft coupled with weak onshore flow that will bring about this cooling trajectory; however, high temperatures on Sunday will range from around 70 near the coast to the mid 70s to lower 80s for the valleys and inland Orange County, with the lower deserts expecting lower 80s, "Through the weekend, high pressure aloft will slowly weaken and weak onshore flow with slow deepening of a shallow marine layer will spread cooling inland," as per the Area Forecast Discussion by the National Weather Service San Diego.
For coastal fog conditions, there's an advisory in effect. Travelers in coastal areas have been dealing with dense fog, with visibility at times dropping below a quarter of a mile; this advisory is expected to last until 9 AM PST this morning for coastal spots in Orange County and San Diego, following the NWS communication on the situational dynamics. The marine layer is anticipated to deepen progressively, which may spread low clouds and fog into the far western valleys by Saturday night into Sunday morning, while aerial conditions over the mountains and deserts remain clear and favorable for VFR (Visual Flight Rules).
Looking ahead into next week, weak offshore flow will initiate some inland warming and drying on Monday, however by Wednesday, a stronger onshore flow is projected to trigger an inland cooling of around 5 degrees, more heavily represented with ensemble members of the GFS and Canadian models, "For the middle and latter part of next week, cluster analysis continues to show the primary forecast variance is in the strength of the high pressure along the West Coast" the report by the NWS San Diego elucidates. In terms of marine conditions, aside from the persistent fog issues, no hazardous conditions are expected through Wednesday, allowing for a relatively mild maritime setting off the Southern California coast.
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