Tuesday, September21, 2021
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Marine Weather and Tides
Los Osos, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:49AMSunset 7:01PM Tuesday September 21, 2021 6:44 AM PDT (13:44 UTC) Moonrise 6:48PMMoonset 6:24AM Illumination 100% Phase: Full Moon; Moon at 15 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ645 Point Piedras Blancas To Point Sal Westward Out To 10 Nm- 255 Am Pdt Tue Sep 21 2021
Today..Winds variable 10 kt or less. Wind waves 2 ft or less. NW swell 6 to 8 ft at 12 seconds. Patchy dense fog with vsby 1 nm or less in the morning.
Tonight..Winds variable 10 kt or less. Wind waves 2 ft or less. NW swell 4 to 6 ft at 11 seconds. Patchy fog in the evening, then patchy dense fog with vsby 1 nm or less.
Wed..Winds variable 10 kt or less, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 3 to 5 ft at 11 seconds. Patchy dense fog with vsby 1 nm or less in the morning.
Wed night..NW winds 10 to 15 kt in the evening, becoming 5 to 10 kt. Wind waves 2 ft or less. NW swell 4 to 5 ft at 13 seconds. Patchy fog in the evening, then patchy dense fog with vsby 1 nm or less.
Thu..Winds variable 10 kt or less, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 6 ft at 12 seconds. Patchy dense fog with vsby 1 nm or less in the morning.
Thu night..NW winds 10 to 15 kt in the evening, becoming 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft at 12 seconds. Patchy fog after midnight.
Fri..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 4 to 5 ft. Patchy fog.
Sat..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft. Patchy fog.
PZZ600 255 Am Pdt Tue Sep 21 2021
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 09z, or 2 am pdt, a 1032 mb high was centered in idaho with a ridge extending to 1027 mb high about 600 nm W of eureka. Mostly weak winds will continue across the waters through Wed. Large swell across the northern outer waters will subside today. There will be areas of dense fog this morning.


7 Day Forecast for Marine Location Near Los Osos, CA
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location: 35.33, -120.84     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 211259 AFDLOX

Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 559 AM PDT Tue Sep 21 2021

SYNOPSIS. 21/326 AM.

Weak offshore flow will bring a warming trend through Wednesday. The hottest temperatures are expected in the inland valleys. Onshore flow should reestablish for late week and into the weekend as a low pressure area drops into California. A cooling trend is expected into Sunday. There will be a slight chance of showers by Friday and Saturday.

SHORT TERM (TDY-THU). 21/416 AM.

Offshore flow continues to strengthen some this morning beneath a ridge of high pressure building in aloft. The ridge axis sits just to the north of the region this morning. A warming trend is shaping up for most of the area today as 950 mb temperatures warm by 4-5 degrees Celsius. The most pronounced warming will be across the coastal and valley areas where temperatures will warm to between 5 and 15 degrees Fahrenheit above normal for this time of year. A heat advisory remain in effect starting late this morning and continuing through Wednesday evening.

A stubborn and shallow marine layer depth remains wedged in across the coastal areas. The shallow marine layer depth will keep a threat of dense fog in the forecast along the coastal areas and across the adjacent coastal waters. Low clouds and dense fog could cut into temperatures some for the beaches, but for the remainder of the coast, the more likely scenario would have the marine layer depth scouring out after sunrise as offshore flow takes control.

The marine layer looks to remain wedged in along the immediate coastal area and across the coastal waters as offshore likely will not be strong enough to completely scour out the marine layer. NAM BUFR time height sections hint at the low clouds and fog remaining near the beaches this afternoon, then making an early return. The forecast keeps this idea in the forecast for the Central Coast, but it certainly could play out south of Point Conception.

Warmer than normal temperatures should linger into Wednesday, but the coastal areas could be a tad cooler as onshore flow starts to reestablish through the day. Wednesday could be the warmest day for the valleys as the 950 mb temperatures top out close to 31 or 32 degrees Celsius.

Ridging aloft breaks down on Thursday and all things hint and point toward cooling. Ensembles members of the GEFS and ECMWF all trend cooler on Thursday as an upper-level trough near 46N and 142W digs southeast into the northern Great Basin or northern Intermountain region.

LONG TERM (FRI-MON). 21/415 AM.

Low confidence exists in the exact movement of the trough after Thursday. Operational model solutions continue to lack run-to-run consistency and model-to-model consistency. Some argument could be made for model-to-model consistency with the 00Z ECMWF/NAM-WRF solutions, but the 06Z NAM-WRF solution varies once again. For this time of year, an inside slider trough make sense, a trough digging from the Great Basin back to the southwest of the southern California coast. There is a range of possibilities including ones the model guidance could not be accounting for. The model solutions seem to be more going along the lines rain or shower activity and cooler temperatures early next week, but a period of gusty north to northeast winds could develop based upon the trough position in some of the model solutions. This bears watching at this point. For now, the forecast is trended more closely to the NBM forecast.

AVIATION. 21/1258Z.

At 12Z at KLAX, the marine layer was about 800 feet deep. The top of the inversion was 1800 feet with a temperature of 27 C.

Low clouds were widespread across coastal sections of Ventura County and the south coast of SBA County early this morning. Clouds were rounding Pt Conception, and will likely affect immediate Central Coast beach area this morning as well. Patchy low clouds were also affecting coastal sections of L.A. County. Conds were mostly IFR to LIFR. Skies should clear in most areas by mid to late morning. Expect fairly widespread low clouds in coastal areas tonight, with generally IFR to LIFR conds again.

There will be locally gusty NE winds thru and below passes and canyons in the mtns and in the valleys of L.A. and Ventura Counties this morning with some mdt UDDF.

KLAX . Moderate confidence in the 12Z TAF. There is a 20% chance of LIFR/IFR cigs/vsbys thru 17z. There is a 20-30% chance that skies will remain clear tonight.

KBUR . High confidence in the 12Z TAF with VFR conditions thru the period.

MARINE. 21/501 AM.

High confidence overall in the forecast. Seas will be near or just above Small Craft Advisory (SCA) levels across the northern outer waters zones (PZZ670/PZZ673) thru mid morning, then are expected to subside below SCA levels. Otherwise and elsewhere, winds and seas are expected to remain below SCA levels thru Sat. With the shallow marine layer, there will be the areas of dense fog across the coastal waters this morning, and again tonight/Wed morning.

LOX WATCHES/WARNINGS/ADVISORIES. CA . Heat Advisory in effect from 10 AM this morning to 8 PM PDT Wednesday for zone 547. (See LAXNPWLOX). PZ . Small Craft Advisory in effect until 9 AM PDT this morning for zones 670-673. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (THU-MON).

There is a slight chance of mountain showers and thunderstorms on Friday and Saturday as a cut-off low drifts over our area and lingers through the weekend.



PUBLIC . Hall AVIATION . DB MARINE . DB SYNOPSIS . Hall

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46215 - Diablo Canyon, CA (076) 9 mi48 min 57°F6 ft
PSLC1 - 9412110 - Port San Luis, CA 12 mi62 min N 1 G 1.9 60°F 61°F1017.4 hPa
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 28 mi44 min SSE 12 G 16 59°F1016.6 hPa

Wind History for Port San Luis, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Luis Obispo, San Luis Obispo County-Mc Chesney Field, CA12 mi48 minN 010.00 miFair57°F47°F69%1016.3 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hrS6SW5W335CalmSW3SW9NW8W10NW14NW12W3SE4SE4E4CalmS4E3SE4E3CalmE4Calm
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NW16NW18NW16NW13NW11NW4NW4CalmCalmN9NW9W8W94
2 days agoSE4S3CalmCalm33SW7W85NW15NW12NW15NW13NW10NW8N7NW5N5N4NW4W7NW8NW10NW14

Tide / Current Tables for Morro Bay, California
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Morro Bay
Click for Map
Tue -- 05:44 AM PDT     0.46 feet Low Tide
Tue -- 06:50 AM PDT     Sunrise
Tue -- 07:24 AM PDT     Moonset
Tue -- 11:42 AM PDT     3.90 feet High Tide
Tue -- 06:07 PM PDT     1.09 feet Low Tide
Tue -- 07:01 PM PDT     Sunset
Tue -- 07:47 PM PDT     Moonrise
Tue -- 11:46 PM PDT     3.85 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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43.42.71.81.10.60.50.81.62.53.33.83.93.63.12.41.81.31.11.31.82.53.23.7

Tide / Current Tables for Port San Luis, California
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Port San Luis
Click for Map
Tue -- 04:51 AM PDT     0.37 feet Low Tide
Tue -- 06:50 AM PDT     Sunrise
Tue -- 07:24 AM PDT     Moonset
Tue -- 11:07 AM PDT     5.10 feet High Tide
Tue -- 05:06 PM PDT     1.17 feet Low Tide
Tue -- 07:00 PM PDT     Sunset
Tue -- 07:47 PM PDT     Moonrise
Tue -- 11:08 PM PDT     5.08 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.83.72.51.40.60.40.81.62.83.94.75.14.94.23.22.21.51.21.42344.75.1

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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