09/115 PM.
Temperatures away from the coast will warm into the 80s and 90s through Monday. 100 degree readings may occur locally in the warmest valleys and Antelope Valley Sunday and Monday. Coastal low clouds will develop each night through the weekend. Cooling will begin on Tuesday.
(Sat-Tue), 09/808 PM.
For the short term, no major changes to previous thinking, Synoptically, upper level ridge will build over the area through Monday then will shift to the east over Arizona on Tuesday. At the surface, onshore flow will weaken slightly through Monday then increase a bit on Tuesday.
Forecast-wise, main issue in the short term will be the heat. With the synoptic pattern, the area will experience a warming trend through Monday. Away from the coast, high temperatures will climb into the mid 80s to mid 90s across the valleys and to near 100 degrees across the deserts. However, across the coastal plain, a persistent marine layer influence will keep those areas noticeably cooler. At this time, heat risk looks to range from the minor to moderate categories. So, do not see any widespread heat issues that would require any advisories at this time, but that will be monitored closely. On Tuesday, as the ridge moves east, a 5-10 degree cooling trend can be expected for most areas.
Otherwise, no significant issues are expected through the short term. Marine inversion will remain entrenched along the coast, so low clouds and fog will continue to be an issues for the coastal plain and lower coastal valleys. Otherwise, skies should remain mostly clear through Tuesday. As for winds, the continued onshore pressure gradients will generate gusty southwesterly winds across interior sections each afternoon/evening, but any advisory-level winds are expected to remain isolated.
(Wed-Sat), 09/113 PM.
A cooler weather pattern with a return of morning low clouds and fog is favored to continue through at least next Thursday when the next upper low is expected to move through California and into the Great Basin. Following the low passage Thursday and Friday gusty north winds are expected to develop over the mountains and portions of southwest Santa Barbara county. Early indications suggest winds gusty to around 50 mph in those areas. Another warming trend will begin later next week into next weekend, mainly for valleys and other inland areas, with lower 90s returning to the valleys.
09/2212z.
At 2130Z at KLAX, the marine layer was 1300 feet deep. The top of the inversion was at 3700 feet with a temperature of 20 degrees Celsius.
For 00Z TAF package, high confidence in CAVU conditions for KWJF and KPMD.
For all other sites, moderate confidence in 00Z TAFs. Timing of flight category changes could be +/- 3 hours of current forecasts. Additionally, there is a 40% chance of VLIFR conditions at KPRB in the 11Z-17Z time frame.
KLAX, Moderate confidence in 00Z TAF. Timing of flight category changes could be +/- 3 hours of current forecasts. No significant easterly wind component is expected.
KBUR, Moderate confidence in 00Z TAF. Timing of flight category changes could be +/- 3 hours of current forecasts.
09/906 PM.
GALE Warnings are in effect through late tonight, and will be strongest across PZZ670. Short period seas peaking 10 to 12 feet are expected through tonight. In addition, Strong Small Craft Advisory (SCA) winds are expected nearshore along the Central coast during this timeframe, and southward from Santa Cruz Island to San Nicolas Island.
Winds and seas should diminish throughout the day on Sunday. By Monday, conditions should be much calmer and are expected to remain below advisory levels through Tuesday. From Wednesday through Friday, chances for SCA level winds will increase each day especially across the outer waters.
Ca, NONE. PZ, Small Craft Advisory in effect until 3 AM PDT Sunday for zone 645. (See LAXMWWLOX). Gale Warning in effect until 3 AM PDT Sunday for zones 670-673. (See LAXMWWLOX). Small Craft Advisory in effect until 3 AM PDT Monday for zones 670-673. (See LAXMWWLOX). Small Craft Advisory in effect until 3 PM PDT Sunday for zone 676. (See LAXMWWLOX).
