Santa Cruz Island to San Clemente Island to 60 NM offshore including San Nicolas and Santa Barbara Islands Marine Forecast
|Tonight...W Winds 15 To 25 Kt, Becoming Ne To E 5 To 15 Kt Late. Strongest Nw Of San Nicolas Island. Combined Seas 7 To 9 Ft Dominant Period 11 Seconds. Patchy Fog After Midnight.|
|Sun...E Winds 5 To 15 Kt, Becoming W 20 To 25 Kt In The Afternoon. Strongest Nw Of San Nicolas Island. Combined Seas 6 To 8 Ft Dominant Period 11 Seconds. Patchy Fog.|
|Sun Night...Nw Winds 15 To 25 Kt With Gusts To 30 Kt. Strongest Nw Of San Nicolas Island. Combined Seas 7 To 9 Ft Dominant Period 10 Seconds. Patchy Fog.|
|Mon...Ne Winds 15 To 20 Kt, Becoming W 10 To 15 Kt In The Afternoon. Wind Waves 2 To 3 Ft. Nw Swell 5 To 7 Ft At 10 Seconds. Patchy Fog.|
|Mon Night...W Winds 5 To 10 Kt. Wind Waves 2 Ft Or Less. Nw Swell 4 To 6 Ft At 10 Seconds. Patchy Fog.|
|Tue...Winds Variable 10 Kt Or Less. Wind Waves 2 Ft Or Less. Nw Swell 3 To 5 Ft At 10 Seconds. Patchy Fog In The Morning.|
|Tue Night...W Winds 10 Kt In The Evening, Becoming Variable 10 Kt Or Less. Wind Waves 2 Ft Or Less. Nw Swell 4 To 6 Ft At 10 Seconds. Patchy Fog After Midnight.|
|Wed...W Winds 10 To 15 Kt. Wind Waves 2 Ft Or Less. Mixed Swell Nw 3 To 5 Ft And S 3 Ft. Patchy Fog.|
|Thu...W Winds 10 To 15 Kt. Wind Waves 2 Ft Or Less. Mixed Swell Nw 2 To 4 Ft And S 2 To 4 Ft. Patchy Fog.|
| Area Forecast Discussion|
National Weather Service Los Angeles/Oxnard CA
149pm PDT Sat May 8 2021
Night through morning low clouds and fog will affect almost all of the coasts and most of the valleys through late next week, otherwise skies will be mostly clear. Temperatures will be near normal to a few degrees above normal thru early next week, rise to above normal levels for most areas by the middle of the week, then cool back to near or below normal late in the week.
.SHORT TERM (TDY-TUE)...08/144 PM.
Good offshore gradient trends to the N and E has helped to largely dissipate the marine layer stratus by early this afternoon. There were a few lingering low clouds at some of the beaches of L.A. County, otherwise sunny skies covered the forecast area which will continue thru late today. Breezy to locally gusty N to NE winds persisted in the Antelope Vly, mtns and foothills early this afternoon and this may continue thru the afternoon. Elsewhere, breezy to locally gusty SW-NW winds can be expected. Temps across the region this afternoon will be several degrees above normal for most areas away from the immediate coast. Highs should be in the upper 60s and 70s along much of the coast, and upper 70s and 80s elsewhere.
The broad NW flow aloft will continue over the forecast area thru Sun, with H5 heigheights around 575-577 dm. It looks like marine layer clouds should affect much of the VTU/L.A. County coast and some adjacent vlys tonight into Sunday morning, with some low clouds also possible mainly for eastern portions of the SBA County S coast by late tonight. Offshore flow over SLO County and much of SBA County tonight into Sunday morning should keep low clouds away from the Central Coast. The low clouds S of Point Conception will clear to the coast midday Sun, with some low clouds lingering along the immediate coast thru the afternoon thanks to strong onshore pressure gradients (NAM forecast LAX-DAG +9.2 mb at 00Z Sunday afternoon). Otherwise, mostly clear skies will prevail across the region thru Sunday afternoon. Temps on Sunday are expected to turn cooler for most areas, with the Central Coast and the coast and vlys S of Point Conception a few degrees below normal. Highs on Sunday will mostly be in the upper 60s and 70s for the coast and adjacent vlys, and in the upper 70s and 80s for the interior vlys, lower mtns and deserts.
Gusty sub-Advisory level NW winds across the I-5 Corridor can be expected tonight. There will be lingering offshore flow over SLO/SBA Counties Sunday morning. Otherwise, onshore flow will increase across the region thru Sunday afternoon.
An upper level trough is forecast move into the central Great Basin Sunday night into Mon, with weak upper level trough.iness expected over the forecast area during the period. Marine layer clouds should expand to all coastal areas into many of the adjacent vlys Sunday night into Monday morning, then clear back to the coast by Monday afternoon. Otherwise, mostly clear skies will prevail across the region. Temps are expected to turn a little cooler for all areas Mon, and should be a few degrees below normal across the coast and most vlys. The warmest vlys and lwr mtns are expected to reach the 70s to mid 80s. Breezy to gusty S to NW winds can be expected for most areas Monday afternoon.
The upper level trough.iness will weaken Monday night and Tue, with H5 heigheights increasing to around 579 dm by Tuesday afternoon. The marine layer should lower some Monday night, with low clouds expected for the coast into the adjacent vlys into Tuesday morning. The low clouds should clear off the coast by late Tuesday morning thanks to offshore gradient trends, with sunny skies expected in all areas thru the afternoon. Generally weak offshore flow Tuesday morning should turn onshore in the afternoon, with breezy to gusty SW-NW winds for many areas. Temps on Tuesday will turn warmer, especially for the vlys, mtns and deserts, which should be several degrees above normal. Highs in the warmest vlys and lower mtns on Tuesday should be in the upper 70s and 80s.
.LONG TERM (WED-SAT)...08/143 PM.
The deterministic EC and GFS are in good agreement thru Thu, then differ greatly in the upper level pattern for Fri and Sat, with the GFS bringing in a rather strong upper level trough into northern CA Fri and a 560 dm H5 low pressure system into central CA on Sat with much lower H5 heigheights over swarning CA. The EC forecasts upper level ridging lingering over the area during the period with H5 heigheights in the 582-583 dm range overall. The mean ensembles paint a different picture and are in much better agreement with a broad upper level trough over the E Pac Fri moving to the CA coast on Sat, altho the GFS is a little quicker with this system. Overall, went with the mean ensembles for the late week forecast.
It looks like the marine layer pattern will continue Wednesday thru Sat, with varying amounts of night and morning low clouds and fog for the coast and adjacent vlys, altho the low clouds should extend into the Santa Clarita Vly Fri night into Sat morning, as well as into some of the northern SLO County vlys, as the marine inversion deepens in response to the E Pac upper level trough. The low clouds should clear to or off the coast by late morning each day. Otherwise, mostly clear skies will continue across the region thru the period. Little change in temps are expected Wednesday and Thu with inland areas remaining several degrees above normal, then cooler conditions should prevail Fri and Sat, with temps running a few degrees below normal for many areas by Sat.
Across the Outer Waters, moderate to high confidence in current forecast. High confidence in Small Craft Advisory (SCA) level winds and seas today through early Monday morning. Across PZZ670/673, there is a 50-60% chance of Gale force winds Sunday afternoon and Sunday night. So, a GALE WATCH remains in effect for these areas. From Monday afternoon through Thursday, high confidence in winds and seas remaining below SCA (Small Craft Advisory) levels.
For the Inner Waters north of Point Sal, high confidence in current forecast. Today through Sunday night, high confidence in SCA (Small Craft Advisory) level winds and seas (with strongest winds during the afternoon and evening hours). For Monday through Thursday, high confidence in winds and seas remaining below SCA (Small Craft Advisory) levels.
For the Inner Waters south of Point Conception, high confidence in current forecast. Today through Thursday, winds and seas will remain below SCA (Small Craft Advisory) levels. A rather persistent eddy circulation will generate southeast winds (5 to 10 knots with gusts to 15 kt) during the night and morning hours today through Monday.
.LOX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...Small Craft Advisory in effect until 9pm PDT this evening for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 3pm PDT Sunday for zones 670-673. (See LAXMWWLOX). Gale Watch in effect from Sunday afternoon through late Sunday night for zones 670-673. (See LAXMWWLOX). Small Craft Advisory in effect until 3am PDT Sunday for zone 676. (See LAXMWWLOX).
.HAZARD POTENTIAL OUTLOOK (TUE-SAT).
No significant hazards expected.