Isolated light showers will continue into Saturday for the mountains westward. Dry weather with a gradual warming trend is expected for Sunday through Friday. Weak to locally moderate Santa Ana winds develop for late Saturday night through Monday afternoon mostly gusting to 45 mph or less. Weaker offshore flow will persist Tuesday and Wednesday. Lower confidence in the weather pattern late in the week with some ensemble members showing precipitation, though the majority remain warm and dry.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
This weekend,
A longwave trough located over the entire CONUS is allowing for another upper level low to drop down over California throughout the day, and then pass to the south as it propagates eastward and opens back up to become absorbed back into the trough. As there still remains to be a decent amount of saturation in the lower levels up to the 700 mb level, the added lift will allow for the cooler temperatures to persist, and also allow for there to be a slight chance of light rain and/or drizzle to be possible this morning, especially for the foothills of San Diego and Orange counties. There could also be some patchy areas of fog for some of the coastal and inland locations. By later in the day, snow levels will continue to drop to around 5500-6500 ft due to colder air advection from the north, which may allow for a dusting of snow later this evening for Mt Laguna, and the surrounding areas. This trough will also allow for the surface pressure gradient to tighten and bring about some stronger and gusty winds across the higher terrain by later this afternoon, and then weaken overnight into tomorrow, with gusts up to around 45-50 mph possible along some of the foothills and through the passes. Drier conditions will also set in tomorrow as the trough begins to flatten and shift further eastward. Winds will continue to turn more easterly tomorrow weak downsloping offshore winds will result in high temperatures being about 3 to 5 degrees warmer from where they will be today.
Monday through Friday,
Drier conditions and a gradual warming trend will occur from the beginning through mid part of next week as a positivitely-tilted ridge begins to build in over the Great Basin. Some of the deterministic models are hinting at the probability of an area of low pressure possibly influencing the region towards the end of the week, although this is still quite far out in the forecast period, and therefore is subject to change. The marine layer will likely struggle to reform overnight and move inland during the early part of next week with weak offshore winds, although once the winds switch back to being onshore by later in the week, the marine layer will also become subsequently more persistent through the early morning hours.
241030z. Coasts/Valleys, Iso -SHRA possible through 19Z this morning for coast/western valleys, bringing occasional vis 5-6 SM. Low clouds covering coastal basin this morning with varying bases 1500-4500 ft MSL. Conditions expected to continue to vary between MVFR and VFR, with occasional local IFR in inland valleys. Low clouds then rise above 3000 ft MSL by 17-19Z and gradually scatter out over the afternoon, lingering longest in inland valleys. Offshore north to east flow develops this afternoon and strengthens late this evening, bringing gusts 20-45 mph for the foothills locally into valleys and likely preventing any low clouds from redeveloping/impacting any TAF sites through Sun morning. Local areas LLWS into the IE possible after 03Z Sun.
.Mountains/Deserts, FEW-SCT clouds around 10,000ft MSL and VFR conditions expected through the period. Local areas BLDU possible late Saturday night into Sunday morning with gustier easterly winds, and local wind gusts 30-50 mph through mtn passes. Mod up/downdrafts near the mountains after 03Z Sun.
No hazardous marine conditions are expected through Wednesday.
Ca, None. PZ, None.
