Friday, August7, 2020
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Marine Weather and Tides
Los Osos, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:15AMSunset 8:01PM Friday August 7, 2020 11:38 AM PDT (18:38 UTC) Moonrise 9:38PMMoonset 9:00AM Illumination 85% Phase: Waning Gibbous; Moon at 18 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- 856 Am Pdt Fri Aug 7 2020
Today..NW winds 10 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 6 ft at 8 seconds. Patchy fog.
Tonight..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 8 seconds. Patchy fog.
Sat..Winds variable 10 kt or less, becoming W 10 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 6 ft at 10 seconds. Patchy fog in the morning.
Sat night..W winds 10 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. NW swell 5 to 6 ft at 10 seconds. Patchy fog after midnight.
Sun..Winds variable 10 kt or less, becoming sw 10 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 6 ft at 10 seconds. Patchy fog in the morning.
Sun night..W winds 10 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. NW swell 5 to 6 ft at 10 seconds. Patchy fog after midnight.
Mon..W winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft. Patchy fog.
Tue..NW winds 5 to 10 kt. Wind waves 2 ft or less. Mixed swell nw 4 to 6 ft and S 3 ft. Patchy fog.
PZZ600 856 Am Pdt Fri Aug 7 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 15z, or 8 am pdt, a 1028 mb high pressure center was located 700 nm west of eureka california and a 1006 mb thermal low was located over southern nevada. Gusty nw winds and choppy short-period seas will continue over the outer waters through late tonight.


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 071558 AFDLOX

Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 858 AM PDT Fri Aug 7 2020

SYNOPSIS. 07/811 AM.

Night through morning low clouds and fog with below normal temperatures will continue across the coasts and portions of the valleys through next week. Interior areas will warm Sunday through Tuesday, then drop back down Wednesday through Friday.

SHORT TERM (TDY-SUN). 07/812 AM.

***UPDATE***

The marine layer is currently between 1000 and 1500 feet this morning. The associated low clouds and fog are behaving as would be expected over SLO and SBA Counties, with solid coverage on the Central Coast and Santa Ynez and Salinas Valleys. Those clouds should clear to the beaches by noon. Over LA and Ventura Counties the story is different however. Virtually all of the clouds have stayed over the ocean, with only a few beaches covered. There is a 1-2 mb weakening trend of the onshore pressure gradients, but otherwise this behavior is hard to explain. This does not bring much confidence for how things will go tonight, but with weakening NW flow over the coastal waters, would expect more typical cloud coverage by Saturday morning. Temperatures for today will be a few degrees warmer than yesterday, and could be a couple of degrees above what is currently advertised over LA and Ventura Counties due to the lack of clouds, but the numbers look pretty close. No major updates needed this morning.

***From Previous Discussion***

Hgts do rise a little today as the upper low over the state weakens some. This, the offshore trends and the reduced low cloud coverage will all combine to bring 3 to 6 degrees over warming to areas away from the coast. The coast areas will not see much change in temps from ydy. Max temps though warmer will still be 4 to 8 degrees blo normal.

The marine layer stratus coverage south of Pt Conception will be the hardest part of the forecast for the weekend. Think there will be a little better eddy each night and this will help bring low clouds to the coasts. Higher hgts will smoosh the marine layer and along with weak offshore trends the vlys will likely not see much if any low clouds.

Max will rise 1 to 3 degrees each day away from the coasts. Still max temps will remain 2 to 4 degrees blo normal.

LONG TERM (MON-THU). 07/323 AM.

EC and GFS are in better agreement for the xtnd period than they have been. The forecast is also a little different too. There will not be much of any flow pattern over the state Monday with a trof far to the north and an upper high far away to the SE. The upper high moves closer in Tuesday and pushes hgts up to 590 DaM. On Wednesday a weak trof comes in from the west and pushes the upper high a bit to the east lowering hgts to 588 DaM in the process. The trof covers more of the state Friday but hgts really do not change.

Moderate to strong gradients persist from the west to east but the onshore push to the north is consistently weak through the period. There will likely not be too much change in the weather. There will be night through morning low clouds and fog across the coasts but the higher hgts will likely keep the clouds out of the vlys. Max temps will not change by more than three degrees on any given day. Other than the marine layer stratus skies will be clear.

Looking ahead in the days 8 to 10 time period there may be a little warm up but nothing extreme and there is no hint of monsoon flow.

AVIATION. 07/1159Z.

At 1110Z at KLAX, the marine layer was 1600 ft deep. The top of the inversion was around 3000 ft with a temp of 19 C.

Low confidence in coastal TAFs south of Point Conception. Arrival of cigs at KLAX and KSMO may be delayed by an hour or more. Cigs will likely be IFR, but there is a 30% chance they may be LIFR. For KSMX and KSBP, there is a 40% chance of VLIFR conditions through 15Z. VFR transition may be +/- 90 min off from fcst time.

Very good confidence in desert TAFs.

KLAX . Low confidence in TAF. Low clouds could arrive anytime 13Z-15Z. There is a 15 percent chc of no cigs. VFR transition could occur anytime between 17Z and 20Z. Good confidence that an east wind component will be 5 kt or less.

KBUR . Good confidence in TAF.

MARINE. 07/853 AM.

Across the outer waters . Winds across the central and southern outer waters will be elevated and gusty to Small Craft Advisory (SCA) level through late tonight. Otherwise, conditions will remain below SCA level throughout the forecast period.

Across the nearshore waters of the Central Coast . Conditions will remain below SCA level throughout the forecast period.

Across the inner waters south of Point Conception . Conditions will remain below SCA level throughout the forecast period.

Patchy fog, locally dense with visibility under one mile, will continue through the weekend. The lowest visibility and most widely spread conditions will occur in the overnight and morning hours.

LOX WATCHES/WARNINGS/ADVISORIES. CA . NONE. PZ . Small Craft Advisory in effect until 3 AM PDT Saturday for zones 673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (SUN-THU).

No significant hazards expected.

PUBLIC . Rorke/Kittell AVIATION . Stewart MARINE . Kj SYNOPSIS . RK

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46215 - Diablo Canyon, CA (076) 9 mi42 min 60°F3 ft
CPXC1 12 mi26 min S 1.9 G 4.1 56°F 1016.5 hPa56°F
PSLC1 - 9412110 - Port San Luis, CA 12 mi50 min S 4.1 G 4.1 55°F 56°F1016.6 hPa
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 28 mi28 min NNW 7.8 G 9.7 57°F1016.3 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 mi42 minN 010.00 miA Few Clouds63°F55°F76%1015.4 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hr4S5NW11NW14NW14NW13NW11NW13NW11NW9NW6NW6W4CalmSE4S3S3S3S3CalmCalmSE3SW3Calm
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NW16NW10W10W7W4SW5SE4CalmCalmCalmCalmCalmCalmW4SW3SW3SW34
2 days ago--5NW19NW15NW15NW18NW16NW12NW9NW6W3CalmS4SE6E6CalmSE5S4SE7E5CalmCalmNW5NW13

Tide / Current Tables for Morro Bay, California
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Morro Bay
Click for Map
Fri -- 01:08 AM PDT     4.03 feet High Tide
Fri -- 06:17 AM PDT     Sunrise
Fri -- 08:12 AM PDT     0.46 feet Low Tide
Fri -- 10:00 AM PDT     Moonset
Fri -- 02:28 PM PDT     3.43 feet High Tide
Fri -- 08:00 PM PDT     Sunset
Fri -- 08:23 PM PDT     1.95 feet Low Tide
Fri -- 10:37 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.843.93.42.71.91.20.70.50.61.11.82.53.13.43.43.12.82.42.1222.32.7

Tide / Current Tables for Port San Luis, California
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Port San Luis
Click for Map
Fri -- 12:21 AM PDT     5.09 feet High Tide
Fri -- 06:17 AM PDT     Sunrise
Fri -- 07:16 AM PDT     0.42 feet Low Tide
Fri -- 10:00 AM PDT     Moonset
Fri -- 01:53 PM PDT     4.36 feet High Tide
Fri -- 07:19 PM PDT     2.36 feet Low Tide
Fri -- 07:59 PM PDT     Sunset
Fri -- 10:36 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.154.53.62.61.60.80.40.51.11.92.93.74.24.44.13.73.12.62.42.42.83.33.9

Weather Map
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wmap_P
GEOS Local Image of Southwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Los Angeles/Oxnard, CA (14,3,4,5)
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Ground Weather Radar Station Vandenberg AFB, CA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.