18/205 AM.
Warmer temperatures are expected this week with some locally breezy Santa Ana winds this morning. The warmest day will be Wednesday with slow cooling the rest of the week along with a return of night and morning low clouds and fog.
(tdy-Thu), 18/1234 PM.
Another offshore push (although slightly weaker) is expected to develop tonight through Tuesday afternoon with wind gusts in the 30-40 mph range across the mountains, and 15-30 mph across the valleys and potentially the eastern edge of the Oxnard Plain. This mornings onshore push surfaced across the valleys and even some coastal areas. The Sandy Fire broke out this morning in Simi Valley and quickly burned through grassy hills due to gusty northeast Santa Ana winds. Even with slightly weaker winds, there again is an elevated threat for fire weather conditions tomorrow thanks in part to a prolonged warm and dry period. Winds will shift onshore Tuesday afternoon. Onshore flow will become more prominent Wednesday, increasing Thursday.
Not expecting any marine layer coverage again until possibly late Tuesday through Wednesday, but more likely Wednesday night into Thursday morning as onshore flow becomes more pronounced. There is a very small chance that southern LA County, specifically the Long Beach area, sees low clouds and fog late tonight into Tuesday morning. Expecting all coastal areas and even some lower valleys to become entrenched in marine layer cloud coverage by Thursday night into Friday morning.
High temperatures will increase 3-7 degrees tomorrow, and another degree or two in most areas Wednesday. By Wednesday, highs in the mid to high 80s will be common across coastal and interior valleys, with low 70s to low 80s common across coastal areas. A cooling trend begins Thursday on the coastal side of the mountains, while the interior will continue to warm a few degrees.
(Fri-Mon), 18/1234 PM.
A fairly quiet pattern will continue through the remainder of the forecast period, with weak winds aloft. Aside from a slight decrease in temperatures Friday and possibly Saturday, there will be little change in sensible weather day-to-day. Widespread temperatures in the 70s to low 80s will be common across coastal valleys and basins, slightly cooler at the immediate coasts with mid 60s to low 70s likely. Inland valleys will see highs reach the mid to upper 80s, with low 90s possible, especially Friday.
A more robust marine layer is likely to develop each night through morning, with some coastal areas struggling to clear each day. Marine layer clouds will try to move into some of the coastal valleys by this weekend, as onshore flow increases into the weekend. Onshore flow will then stay relatively steady through Monday. Moderate southwest winds across the Antelope Valley and foothills by this weekend, which would lead to elevated fire weather concerns each afternoon in the far interior.
18/1731z.
At 1633Z at KLAX, there was no marine layer nor an inversion.
Overall, moderate to high confidence in 18Z Package. VFR conditions are expected. However, there is a moderate chance of MVFR CIGs at KLGB and KLAX 10Z-16Z Tuesday.
KLAX, Moderate confidence in TAF. High confidence in VFR conditions through at least 06Z Tuesday. Moderate chance of MVFR CIGs around 015 from 10Z-16Z Tuesday. No significant east wind component expected.
KBUR, Moderate confidence in TAF. No wind issues expected.
18/123 PM.
For the Outer Waters, high confidence in current forecast. Small Craft Advisory (SCA) level winds and seas will linger through tonight. For Tuesday through Friday, winds and seas are expected to remain below SCA levels.
For the Inner Waters north of Point Sal, high confidence in current forecast. From this afternoon through Friday, winds and seas are expected to remain below SCA levels.
For the Inner Waters south of Point Conception, high confidence in current forecast. Through Friday, winds and seas are expected to remain below SCA levels.
Ca, Wind Advisory remains in effect until 3 PM PDT this afternoon for zones 88-375>380. (See LAXNPWLOX). PZ, Small Craft Advisory in effect until 3 AM PDT Tuesday for zone 670. (See LAXMWWLOX). Small Craft Advisory in effect until 9 PM PDT this evening for zones 673-676. (See LAXMWWLOX).
