Cooler and breezy weather will occur this weekend as a weak weather system moves over the area. This system will bring gusty winds across the mountains and deserts along with the chance for some light precipitation along and west of the mountains as well. Next week will remain cooler with highs near to slightly below average and mainly dry weather.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
Today through tomorrow night,
An approaching low pressure system is going to allow for onshore flow to increase by later on today, and there will be increasing winds, especially across the higher terrain and for wind-proned areas. These winds will further increase by tomorrow as the trough nears the region. There will also be a chance of showers for tomorrow, mainly for the coastal-facing slopes of the inland foothills, as west winds become further enhanced. This will also result in winds increasing enough to warrant a Wind Advisory across the high deserts and within San Gorgonio Pass near Banning, where winds by late tomorrow afternoon may possibly gust up to 65 mph in some of the localized areas near the desert slopes on the north- facing side of the San Bernardino Mountains. There could be some blowing dust possible. Generally, winds across the higher elevations will gust around 40 to 55 mph. The best chance of rain will be tomorrow evening though early Sunday morning, with possibly up to three quarters of an inch in vicinity of Palomar Mountain. There may also be some areas around the coastal areas of San Diego County receiving close to a half an inch of rainfall near Oceanside. Otherwise, most locations west of the mountains will likely receive total precipitation amounts of around 0.10-0.25 inches. Temperatures will also be on a cooling trend with this system moving through, with temperatures below the seasonal average by 5 to 10 degrees for highs on Saturday.
The rest of this weekend through the middle of next week,
For Sunday, showers will continue to taper off during the morning, and winds will also weaken throughout the day as the low pressure system exits the region. Sunday will be even a degree or two for most locations, and snow levels will fall to around 5000 feet by Sunday morning, with possibly a few inches of snow for locations above 6500 feet. Overall troughing will remain in place over the Great Basin, with a cut-off low being located well to the southwest over the Pacific Ocean. There is more divergence in the models from this period in the forecast and onward in terms of what happens with this cut-off low, as some of the deterministic models have this feature moving back in over the region towards the middle of next week, which may give us another chance of rain and reinforce us with cooler temperatures. Ensembles also reflect a somewhat cooler and more unsettled pattern remaining in place through then, with temperatures for the most part remaining below average.
240845z, Coast/Valleys, Areas of low clouds to gradually develop this morning, with SCT to locally BKN cigs around 1500-2500 feet MSL most likely 12-17Z. Low clouds based 2000-3000 feet MSL to return after 02Z with more uniform coverage and inland extent, eventually filling most of the coastal basin by 12Z Saturday.
Mountains/Deserts, Westerly winds strengthen after 23Z with widespread gusts 25-35 kts, locally to 45 kts along desert slopes and through mountain passes. Moderate up/downdrafts expected in lee of mtns.
Otherwise, SCT high clouds today becoming BKN tonight.
No hazardous marine conditions are expected through Tuesday, though brisk westerly winds 15 to 20 kts are expected each afternoon and evening through Sunday.
Ca, Wind Advisory from 2 PM Saturday to 11 AM PDT Sunday for Apple and Lucerne Valleys-San Gorgonio Pass near Banning.
PZ, None.
