Moderate to locally strong Santa Ana winds will continue along the coastal mountain slopes, foothills, and into the valleys through Monday. Periods of weaker Santa Ana winds will continue through the remainder of the week. A warming trend continues, with temperatures peaking around the middle of the week. Wednesday and Thursday will likely be the warmest days.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
This morning, Santa Ana winds and low humidity continue. Surface pressure gradients remain strongly offshore, with -11.2 mb SAN-TPH but the upper level support has weakened. In the last hour, several locations in the San Bernardino and San Diego County Mountains have reported northeast to east winds gusting 60-70 mph. Many other locations in the mtns and inland valleys (near the foothills) have reported wind gusts of 45 mph or greater.
Winds will gradually weaken and become less widespread through the week as sfc pressure gradients and upper level support weaken, however winds will likely remain strong enough to meet Wind Advisory thresholds through Monday morning. The persistent dry conditions with offshore winds will make it unlikely that any marine layer moisture/clouds would return any time this week.
The extensive ridge of high pressure and offshore flow will continue the warming trend which will peak on Wednesday. This will likely be the warmest day with daytime temperatures reaching the low 80s in some inland valley areas. In the coastal areas and deserts, temps will be 5-10 degrees above seasonal averages and in the inland valleys, temps will be as much as 15 degrees above averages. The dry conditions will allow for efficient radiation cooling at night and as the Santa Ana winds become weaker and less widespread, more locations in the inland valleys will become wind-sheltered allowing overnight temps to lower into the low 30s or high 20s.
After Wed, forecast details become more uncertain as model solutions diverge but there is reasonable confidence that SoCal will remain dry and warm with periods of Santa Ana winds into next weekend.
110930z, Coast/Valleys/Mountains, Clear skies prevailing. Northeast and east winds gusting generally 30-45 kts along coastal slopes with 25-40 kts downwind of the Cajon/Banning passes into the Inland Empire and parts of Inland Orange County/eastern San Diego Valleys. Periods of LLWS with mod up/downdrafts downwind of coastal slopes, especially at night when strong winds are more likely to separate from the surface. Offshore wind pattern continues through the remainder of the weekend. Slightly weaker winds by Monday afternoon with the strongest gusts more confined to the mountain slopes.
Deserts, VFR conditions through Sunday evening. Elevated northeast winds staying mostly confined to desert foothills with gusts 15-25 kts.
Localized easterly wind gusts near 20 to 25 knots sporadically through Monday morning. Otherwise, no hazardous marine conditions expected through Thursday.
Ca, Wind Advisory until 2 PM PST Monday for Orange County Inland Areas-Riverside County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Valleys-Santa Ana Mountains and Foothills.
High Wind Warning until 1 PM PST this afternoon for San Bernardino County Mountains-San Diego County Mountains-San Gorgonio Pass near Banning.
Wind Advisory from 1 PM this afternoon to 2 PM PST Monday for San Bernardino County Mountains-San Diego County Mountains- San Gorgonio Pass near Banning.
PZ, None.
