Cooler weather for inland areas is expected this weekend into the first half of next week as a trough of low pressure moves over the region. This will also bring breezy conditions across the mountains and deserts this afternoon through Saturday evening. High pressure looks to expand over the West Coast by the latter half of next week, which would lead to a warming trend.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
Zooming out, we see a 591 mb high to our southwest over the East Pac and 540 mb low off the coast of British Columbia. The high's influence has led to a shallower inversion, leading to some hazy conditions in the western valleys and clouds sticking closer to the coast. Clouds will struggle to clear at the beaches, but may do so intermittently later this afternoon. Heights lower as the area of low pressure to the north moves closer to our region over the weekend. This will lead to increased winds over the mountains and deserts starting later this afternoon through Saturday. Winds will mostly be near 25-40 MPH with highest winds in the San Gorgonio Pass locally over 50 MPH, so please be sure to drive with care. Cooler weather will also occur inland over the weekend with Sunday being the coolest day overall. Highs in the 70s and 80s will occur across most areas with highs 95-100 degrees across the lower deserts.
The trough will remain in place into early next week, with minimal changes in the weather from day to day. Marine layer clouds will work their way into most areas west of the mountains each night and morning into the middle of next week. Cluster analysis shows fair agreement on a ridge off the coast strengthening by the latter half of next week. This will lead to a warming trend with less wind and a deeper marine layer, but how warm we become is still something to be determined as the timing and strength of the departing trough may try to influence our weather pattern as well.
060000z, Coast/Valleys, Low clouds based around 1500-1700ft MSL with tops to 2100-2200ft are lingering along the coastal region, poised to spread inland again after 02z and spread more fully inland including into the Inland Empire with bases closer to 1500-1800ft MSL through Saturday morning. VIS 4-6 SM for inland edge of clouds in valleys/Inland Empire. Clouds will struggle to clear from coastal regions again Sat morning, but intermittent clearing will be possible generally after 20z.
Mountains/Deserts, SKC and VFR with increasing clouds AOA 20000ft MSL tonight into Saturday. Southwest-west winds will increase in the mountains and deserts with gusts reaching 30-40 knots after 18z Sat, decreasing Saturday evening. MOD up/downdrafts and pockets of LLWS in lee (north and east) of mountains.
No hazardous marine conditions are expected through Tuesday.
A series of long period (17-19 second) swells from the south (200 degrees) will result in elevated surf for most of the next week. Surf 4-6 feet at south facing beaches currently through Saturday, with swell and surf weakening on Sunday. Surf builds again Monday as a 3-4 foot swell at 18-19 seconds moves into the region. Surf peaks Tues-Wed with sets to 5-8 feet likely at south-facing beaches, then gradually diminishes late next week.
Ca, None. PZ, None.
