There could be a few sprinkles or light showers over the higher mountains today. Otherwise dry weather is expected through Monday with warming for the weekend. Low pressure systems moving to near the West Coast for the middle of next week will bring cooling, gusty southwest winds for the mountains and deserts, and a chance of showers.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Sunday), Mid and high level moisture and clouds will gradually move north of the area today as a weakening low pressure system moves inland along the coast. While there could still be a few sprinkles over the higher mountains from mid-level light showers today, there has yet to be any measurable precipitation and little or none is expected. The marine layer has deepened to around 1500 feet with areas of low clouds extending inland across portions of the Orange County coastal plain and into the western valleys in San Diego County.
High temperatures for today will be cooler, especially for the coast and valleys with the Orange County coastal plain as much as 10 to 15 degrees cooler than Thursday. High temperatures today will range from the mid 60s near the coast to the upper 60s to mid 70s for the valleys with the lower deserts in the upper 70s to around 80. Even with the cooling, high temperatures for inland areas will still be 5 to 10 degrees above average.
High temperatures will warm for both Saturday and Sunday with Sunday high temperatures as much as 12 to 18 degrees above average for some location in the inland valleys and on the lower coastal slopes of the mountains. High temperatures on Sunday will range from the lower 70s near the coast to the upper 70s to mid 80s for the valleys with the lower deserts in the mid to upper 80s.
(Monday through Thursday), Dry weather will continue through Monday afternoon with high temperatures on Monday a few to around 5 degrees cooler than Sunday. There will be greater cooling for Tuesday into Wednesday with slight warming for Thursday. High temperatures on Tuesday and Wednesday will be around average, ranging from the lower to mid 60s near the coast to the 60s for the valleys with the lower deserts in the lower to mid 70s.
There continue to be differences for next week in the handling of low pressure over the eastern Pacific into the western states. An initial low pressure system may move inland into California around Monday night and Tuesday with a second that could move to the coast or move toward the south and remain off the coast. Chances for measurable precipitation from the calibrated, deterministic NBM for both Tuesday and Wednesday ranges from 25 to 35 percent near the coast to around 40 to 50 percent for the mountains.
061000z. Coast/Valleys, Patchy areas of low clouds are still hanging out around 800-1,500ft MSL and have moved inland in some areas as far as 20 miles. Due to the patchy nature of the low clouds, intermittent VFR conditions will occur at times. VIS has stayed above 6SM at TAF sites but could be less in areas where clouds intersect the terrain. Low clouds should scatter out by 18- 20Z, returning after 02Z Saturday with CIGs expected around 1,500- 2,500ft MSL.
High clouds around 11,000-15,000ft MSL are continuing over the area with high clouds AOA 25,000ft MSL expected after 18Z. Slight chances for -SHRA mainly over the San Bernardino mountains and the high deserts are still expected through about 12Z.
A building northwesterly swell (280 degrees) at 15-16 seconds will bring seas of 6-9 feet in the outer waters near/around San Clemente Island today and Saturday. This may also lead to localized steep, rough conditions near the bay entrances, including the entrance to the San Diego Bay/Zuniga Shoal area. Otherwise, no hazardous marine conditions are expected through Wednesday.
Increasing long-period (15-16 second) swell from the west-northwest (280 degrees) will bring elevated to high surf of 5-8 feet with locally higher sets to 10 feet this afternoon through early Sunday morning. Impacts will be greatest at west facing beaches, especially across southern San Diego County, and there will be a high risk for rip currents. This may also lead to minor tidal overflow for low- lying beach areas during high tide late tonight into early Saturday. Further information can be found in the High Surf Advisory.
Ca, High Surf Advisory from 10 AM this morning to 6 AM PST Sunday for Orange County Coastal Areas-San Diego County Coastal Areas.
PZ, None.
