Marine Weather and Tide Forecast for Marina del Rey, CA

.SHORT TERM (TDY-MON)...07/320 AM.

The offshore flow is winning the battle with the shallow marine layer this morning and save for a few low clouds and patchy dense fog near Long Beach skies will be clear today. A small ridge will build over the state today and hgts over Srn CA will increase to 581 dam. Offshore flow will peak this morning between 3 and 4 mb from both the N and S. The will be no upper level or thermal support which will limit the wind development. Most of the canyon and ridgetop winds will be in the 15 to 25 mph range with local gusts to 35 mph. The Santa Susana Mountains is the only location where wind gusts up to 50 mph are probable. Max temps soared ydy and today's readings will be similar to ydy's very warm results.
There are onshore trends in the afternoon and this will likely knock a few degrees off of the coastal temps esp across the Central Coast. Coastal temps today will be 4 to 8 degrees above normal while the vlys and the interior will rise to 10 to 15 degrees over climo norms.

Tonight and into Sunday the ridge will be pushed to the east by an approaching trof. Gradients will switch from offshore to onshore.
The trof will bring some mid and high level clouds to the area esp SLO and SBA counties. The switch to onshore flow and an eddy will combine to bring low clouds to most of the coasts and some of the lower vlys as well. These low clouds may be slow to clear if the eddy is strong enough. Max temps will fall 4 to 8 locally 9 to 12 degrees due to the onshore flow, lower hgts and deeper marine layer.

Sunday night and Monday the state will be in between a ridge to the west and a trof to the east. NW flow will set up over the area. There will only be weak offshore flow and some low clouds may form across the LA/VTA coasts. Other than the low clouds Monday will be sunny. Monday will be an unusual day as a strong Great Basin sfc high will develop and will accelerate the offshore flow during the day even against the typical diurnal onshore trends. The trof passing over NV will also usher in some cold air thermal support for offshore winds. Gusty offshore winds will likely develop in the afternoon rather than the typical early morning time frame. Advisory level gusts are possible later in the afternoon across the Santa Clarita Vly and Santa Susana Mtns. Max temps not change much for most of the area but the incoming cool air from the interior will lower temps across the Antelope Vly by 4 or 5 degrees.

.LONG TERM (TUE-FRI)...07/320 AM.

All eyes on Monday night and Tuesday as another strong Santa Ana wind event looks likely. The E/W gradients will continue to accelerate in the offshore direction and will likely end up in the 7 to 8 mb range with a 25 percent chc of it hitting 9 mb. Almost as important as the actually gradient is the rapidness of the 24 hour gradient change which will be near a very impressive 12 mb.
Add in some good upper level and thermal support and you have the makings of an impressive wind event. Advisory level gusts are almost a guarantee and widespread warnings are looking more and more likely. Since this there is not much of a northerly component to this event the winds will be more easterly than normal and this will increase the danger to Avalon Harbor. Fire weather concerns will be greatly heightened with these strong winds please see the fire weather discussion below for details. SLO and SBA counties, will also see some northeasterly winds, but the speeds will be noticeably weaker than the VTA/LA winds. Stay tuned for further updates and refinements of this potentially dangerous wind event.

Wednesday will also be windy but with onshore trends the winds will be not be nearly as strong as on Tuesday.

The deterministic mdls diverge starting Thursday and the ensemble members begin to exhibit noticeable spread so not the best confidence in the fcst from Thursday on. Thursday will be dry with max temps remaining 3 to 6 locally 8 degrees above normal.

On Friday and into Saturday there will be an increasing chance of some light rain. The latest mdl runs are now thinking that the rain is more likely Friday night and Saturday which is later than what last night's runs were saying. Cooling does seem like pretty safe bet with max temps falling to near normal by Friday.

AVIATION
07/1108Z.

Around 0815Z, there was no marine layer depth at KLAX. There was a surface-based inversion up to around 1000 feet with a temperature of 23 degrees Celsius.

High confidence in the current forecast, except for a low-to- moderate confidence at Los Angeles County coastal terminals and KPRB through 16Z. There is a low-to-moderate chance of VLIFR conditions or MVFR visibilities at Los Angeles County coastal terminals and KPRB through 16Z. There is a low-to-moderate chance of moderate low-level wind shear and turbulence at Los Angeles County valley terminals and Ventura County coastal terminals.

KLAX...VFR conditions are expected through the period, except for a 20 percent chance of VLIFR conditions between 13Z and 16Z. Any east winds will likely be less than 7 knots.

KBUR...VFR conditions are expected through the period. There is a 10 percent chance of moderate low-level wind shear and turbulence through 16Z.

MARINE
07/322 AM.

Moderate confidence in the current forecast. Slightly higher confidence in seas relative to winds.

For the waters southwest through northwest of the Channel Islands and along the Central Coast, there is a low-to-moderate chance (10 to 40 percent) chance of Small Craft Advisory (SCA) level northwest winds through this afternoon, increasing to a moderate- to-likely (30 to 60 percent) chance of SCA level winds this evening through early Monday morning. The highest chance for SCA level winds will be for the waters beyond 30 NM offshore of the Central Coast extending south to northwest of San Nicolas Island, while the lowest chance will be for the waters nearshore along the Central Coast. There is a moderate-to-high (30-50 percent) chance of widespread SCA conditions between Sunday night and Monday across this region. After Monday morning, winds and seas will likely drop below SCA levels through Wednesday.

Inside the southern California bight, there is a low-to-moderate (20-40 percent) chance of SCA level northeast winds nearshore between Rincon Point and Pacific Palisades this morning through Monday morning, then there is a likely chance (60-80 percent)
chance of SCA level winds between Monday night and early Wednesday morning. There is a moderate-to-high chance of east facing harbors seeing significant impacts. Theses harbors would include Avalon and Two Harbors on Catalina Island, and Smugglers Cove on Santa Cruz Island.

BEACHES
07/250 AM.

High astronomical tides approaching 7 feet during the early morning hours will bring a chance of moderate coastal flooding to southwest California shores late next week and next weekend.
Normally dry beach walkways and parking lots may see tidal overflows and minor coastal flooding. There is a chance that beach erosion may occur. Rip current activity may increase during the run up to high tide.

LOX WATCHES/WARNINGS/ADVISORIES
CA...Wind Advisory in effect until 10 AM PST this morning for zone 375. (See LAXNPWLOX).
Fire Weather Watch in effect from Monday morning through Wednesday afternoon for zones 288-354-355-358-362-369>380-548. (See LAXRFWLOX).
PZ...Small Craft Advisory in effect from 4 PM this afternoon to 4 AM PST Monday for zone 670. (See LAXMWWLOX).
Small Craft Advisory in effect from 9 PM this evening to 9 AM PST Sunday for zone 673. (See LAXMWWLOX).