The National Weather Service in San Francisco has reported a slight cooling trend beginning today for inland areas. At the same time, coastal regions can expect a continuation of marine layer clouds, some drizzle, pockets of fog, and typical breezy winds each afternoon and evening. A shift to a more zonal upper-level pattern will influence this change, creating a more direct west-to-east air flow over the west coast, thus leading to more onshore flow and cooler temperatures inland, albeit only by a few degrees. NWS San Francisco advises residents along the coast to anticipate little change with the "June Gloom" weather pattern persisting.
Marine layer dominance continues to dictate climatic behaviors, entrenching the North Bay valleys and the coast, particularly with fog through late morning and potential drizzle. As the mist and coastal drizzle have been finely tuned and adjusted, according to NWS forecasts, the marine layer's expansion should occur this evening, reducing the moisture concentration and potentially clearing cloud cover sooner in some areas.
Looking ahead, the persistent onshore flow is predicted to maintain cooler conditions for inland environments well into the upcoming weekend. The entrance of a weak trough could see the marine layer's influence expanding further, with cloud layer levels expected to rise. However, forecast models post-weekend show uncertainty, some hinting at a transition to a warmer ridge pattern while others suggest maintaining zonal conditions.
Regarding aviation conditions, VFR is the prediction for most areas this afternoon, excluding Half Moon Bay (HAF), with stratus clouds likely to return early in the evening. Moderate onshore winds will continue throughout the period. The vicinity of SFO should witness an improvement in conditions from IFR to VFR as the day progresses, with the possibility of strong winds throughout the forecast period. Broken sneaker waves, bringing a heightened risk for rip currents, prompted the NWS to warn beachgoers to remain vigilant near the ocean. The agency emphasizes caution and the importance of never turning one's back on the sea.
