16/518 PM.
High pressure and offshore flow will bring very warm and dry conditions to the region through the weekend along with gusty northeast winds at times across Los Angeles and Ventura Counties. A slow cooling trend will continue, but above normal temperatures are expected at least into early next week.
(Tue-Fri), 16/839 PM.
High pressure aloft remains in full control over the entire West coast and that will continue at least through Wednesday. Closer to the surface, moderate to strong offshore flow is expected to continue at least through Sunday. There was a slight decrease in offshore flow this morning which was just enough to allow some low stratus to move into some beach areas for a few hours. However, offshore trends resumed this afternoon and probably won't be a return of that tonight except possibly along the Central Coast. Highs today have again surged into the 80s across most coast/valley areas except the beach areas. With a slight increase in offshore flow again tonight and Saturday, expected a very similar day in most areas with highs again 10-20 degrees above normal. And with that offshore flow increase there will also be an increase in Santa Ana winds across portions of LA/Ventura Counties. Latest hi res models are showing winds very close to advisory levels across the usual areas favored for east winds.
Offshore flow is expected to slowly decrease Sunday and Monday which will allow cooler onshore flow to move in sooner, however highs will still be in the mid 70s to lower 80s at least and possibly still some mid 80s in the warmer valleys. As gradients weaken there will be an increasing chance of dense fog near the coast and most beach areas will top out in the 60s.
17/0117z.
At 2351Z at KLAX, there was a surface-based inversion. The top of the inversion was near 1500 feet with a temperature of 25 degrees Celsius.
For 00Z TAF package, high confidence VFR conds for Sites away from the coast, except for a 20% chance of brief or periodic LIFR at KPRB. For coastal sites moderate to high confidence overall, with reduced confidence for the Central Coast where there is a 20-30% chance of LIFR/VLIFR conditions 10Z-18Z. For the L.A. County Coastal sites, there is a 10-20% chance of LIFR/VLIFR conds.
KLAX, Overall, high confidence in the 00Z TAF as CAVU conditions are anticipated through the period. However, there is a 10-20% chance of LIFR/VLIFR conditions 10Z-18Z. No significant easterly wind component is expected.
KBUR, High confidence in the 00Z TAF as CAVU conditions are anticipated through the period. There is a 30-40% chance of light to moderate LLWS and turbulence 06Z-18Z.
16/834 PM.
Overall, high confidence in current forecast for all of the coastal waters. Through Wednesday, winds and seas are expected to remain below Small Craft Advisory (SCA) levels. However, there will be a 30% chance of SCA level northeast winds from Point Mugu to Santa Monica Saturday morning.
Dense fog with low visibilities will continue to impact the coastal waters through the weekend. The most widespread coverage is expected across the Outer Waters and south of the Channel Islands. Visibilities of one nautical mile or less can be expected.
Ca, NONE. PZ, NONE.
