Gusty easterly Santa Ana winds along and below the coastal slopes of the mountains will diminish this afternoon. A low pressure system off the northern Baja coast will spread mid and high level moisture and clouds across the area for today through Friday with a slight chance of showers for the mountains for late tonight through Friday afternoon. The weekend through Monday will be drier and warmer. For next Tuesday and Wednesday, low pressure systems from the northwest could bring more widespread precipitation.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
.New Aviation Discussion for the 18z TAF Package,
(today through Saturday), The atmosphere aloft is very warm and dry. Easterly Santa Ana winds continue early this morning along and below the coastal slopes of the mountains. The winds are mostly gusting to around 35 mph with isolated gusts to 45 to 55 mph. In areas where the winds are providing mixing with the warmer air aloft, temperatures are mostly in the 70s. This is mainly in areas below the coastal slopes of the mountains and even in higher terrain near the coast. In wind-sheltered areas in the Inland Empire, temperatures have fallen into the 40s.
A low pressure system is off the coast of northern Baja. It will move slowly toward the northeast with mid and high level moisture and clouds spread into the area from the southeast for today into Friday with a slight chance of showers for the mountains for late tonight through Friday afternoon. With lower levels of the atmosphere still quite dry, the most likely location for measurable precipitation, though light, is in the mountains.
High temperatures for coastal areas will begin to cool today with more substantial cooling of 10 to 15 degrees on Friday. Most areas will warm a few to around 5 degrees on Saturday. High temperatures on Saturday will be a few degrees above average near the coast and 5 to 10 degrees above average for inland areas with high temperatures ranging from the mid to upper 60s near the coast to the 70s in the valleys with the lower deserts around 80.
(Sunday through Wednesday), Dry weather will continue for Sunday into Monday. High temperatures on Sunday will warm a few to around 5 degrees with the greatest warming for coastal areas into the valleys. There will be cooling on Monday of a few to around 5 degrees with the greatest cooling for the inland valleys. High temperatures on Sunday will range from around 70 near the coast to the 70s in the valleys with the lower deserts in the lower to mid 80s.
For Monday night into the middle of next week, there will be increasing chances for precipitation, though still with some differences in the details, from low pressure systems from the northwest moving across the area.
051815z. Coast/Valleys, Low clouds based 1000-2000ft MSL will develop after 06z Fri and attempt to move inland, with periods of MVFR CIGs at coastal TAF sites. The low clouds are expected to be patchy, which may result in periods of scattering out and conditions briefly returning to VFR. VIS generally should be above 5SM everywhere except where clouds intersect terrain. Low clouds should move out of inland areas or scatter out by 16z Fri.
High clouds AOA 15,000ft MSL continuing to stream over the area, moving out by 12-18z Fri. Easterly winds will continue to weaken through 21z today, falling below 20 mph for nearly everywhere. Slight chance of -SHRA mainly over mountains and deserts after 00Z, with cloud bases as low as 8000 feet MSL.
A building northwesterly swell (280 degrees) at 15-16 seconds may bring seas of 6-9 feet in the outer waters near/around San Clemente Island Friday and Saturday. This may also lead to localized steep, rough conditions near the entrance to the San Diego Bay/Zuniga Shoal. Otherwise, no hazardous marine conditions are expected through Monday.
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 late Friday into Saturday. Impacts will be greatest at west facing beaches, especially across southern San Diego County, and there will be a high risk for rip currents. Further information can be found in the High Surf Advisory. This may also lead to minor tidal overflow for low-lying beach areas during high tide late Friday into early Saturday.
Ca, High Surf Advisory from 10 AM Friday to 6 AM PST Sunday for Orange County Coastal Areas-San Diego County Coastal Areas.
Wind Advisory until noon PST today for Orange County Inland Areas-Riverside County Mountains-San Bernardino County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Mountains-San Diego County Valleys-San Gorgonio Pass near Banning-Santa Ana Mountains and Foothills.
PZ, None.
