Tuesday, May26, 2020
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Marine Weather and Tides
Atascadero, 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 5:49AMSunset 8:10PM Tuesday May 26, 2020 10:33 AM PDT (17:33 UTC) Moonrise 8:09AMMoonset 11:03PM Illumination 21% Phase: Waxing Crescent; Moon at 4 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- 835 Am Pdt Tue May 26 2020
Today..Winds variable 10 kt or less, becoming W 10 kt in the afternoon. Wind waves 2 ft or less. W swell 5 to 6 ft at 13 seconds.
Tonight..W winds 10 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. W swell 5 to 6 ft at 12 seconds.
Wed..Winds variable 10 kt or less, becoming W 10 kt in the afternoon. Wind waves 2 ft or less. NW swell 4 to 5 ft at 11 seconds.
Wed night..W winds 10 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. NW swell 4 to 5 ft at 11 seconds. Patchy fog after midnight.
Thu..Winds variable 10 kt or less, becoming W 10 kt in the afternoon. Wind waves 2 ft or less. NW swell 4 to 5 ft at 10 seconds. Patchy fog in the morning.
Thu night..W winds 10 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds. Patchy fog after midnight.
Fri..S winds 10 to 15 kt. Wind waves 2 ft or less. Mixed swell nw 4 to 6 ft and S 3 ft. Patchy fog.
Sat..SW winds 10 to 15 kt. Wind waves 2 ft or less. Mixed swell nw 4 to 6 ft and S 3 ft. Patchy fog.
PZZ600 835 Am Pdt Tue May 26 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 1023 mb surface high was located 650 nm west of point conception and a 1008 mb thermal low was over southeast california. Patchy dense fog with visibility of one nautical mile or less is likely through this morning and possibly into this afternoon south of point conception.


7 Day Forecast for Marine Location Near Atascadero, CA
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location: 35.46, -120.69     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 261621 AFDLOX

Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 921 AM PDT Tue May 26 2020

SYNOPSIS. 26/918 AM.

High pressure will bring mostly clear skies and hot temperatures to inland areas over the next few days. The coast will stay cooler with areas of low clouds and dense fog, some of which may linger into the afternoon. The heat will diminish slightly on Thursday, then becoming near normal by Sunday.

SHORT TERM (TDY-THU). 26/915 AM.

A very strong and shallow marine inversion has set up and a solid layer of stratus has formed underneath it from around Pt Conception south with tops ranging from 300-500'. With an onshore flow of 2mb this morning running to 7-9mb the next few afternoons it will be a struggle for some beaches to clear, especially from Malibu to SB. Lowered the coastal highs today by a few degrees and that may not have been enough given that it was only 77 in downtown LA yesterday and trends are very similar to yesterday.

Temps will ramp up quickly going into the valleys and highs in the 90s there still look on track. Warmest valley areas like the western SFV will likely top out in the mid to high 90s, though morning lows in the high 50s to low 60s are providing ample overnight relief to hold off any heat advisory issuances.

***From Previous Discussion***

Very little change Wednesday from Tuesday, though onshore gradients will be increasing, possibly leading to some gusty southwest winds in and around the AV. Continued low humidities and decreasing fuel moistures there will present some increased risk for enhanced fire behavior but not for long enough duration to consider any sort of red flag issuances.

The ridge begins to push east on Thursday in response to a large upper low moving in from the WSW. Hgts really do not change so the Mtn and further inland areas will not see much cooling. The onshore gradients do increase and this will be some cooling to the coasts and to a lesser degree the vlys. It will also be windier across the mtns and desert areas.

LONG TERM (FRI-MON). 26/340 AM.

Good cooling on tap on Friday. A 564 DM upper low will approach the coast coming from the WSW. The will be pushed almost into New Mexico. Hgts do not fall that much (except across the Central Coast) The Cyclonic flow from the upper low will combine with strong onshore flow to bring clouds to at least the coasts and lower vlys and this may even be under done. The deeper marine layer and stronger onshore flow along with the lowering hgts will all work together to lower max temps 10 to 15 degrees. Despite the cooling max temps will still be 3 to 6 degrees above normal.

The upper low will make its closest approach to the Central Coast Friday night as it is deflect almost due north by the ridge. There are still enough dry ensemble members to keep the forecast dry but really would not be surprised if the SLO county coasts and esp coastal foothills see some rain drops.

Broad troffing sets up for both Sat and Sun. Hgts fall to 578 DM and the moderate onshore flow will keep a May Grey pattern going with coastal temps a little above normal and interior temps a little below normal.

The 00Z GFS and EC and many of their ensemble members show a sharper trof and some PVA moving across the state. Both of these runs show some light rain for SLO and SBA counties. Interestingly (but not surprising for a day 7 forecast) the 06Z GFS run is dry. Still looking at all the ensembles a slight chc of rain seems reasonable for the Central Coast.

AVIATION. 26/1010Z.

At 0530Z, the marine layer depth was near 800 feet deep at KLAX. The top of the inversion was near 2000 feet with a temperature of 27 degrees Celsius.

Moderate confidence for coastal terminals. High confidence for valley and desert terminals.

VLIFR to LIFR conditions are likely at coastal terminals south of KSMX through 17Z, and again after 03Z. There is a chance that LIFR conditions could clear up to two hours later than forecast and arrival could be up to two hours earlier than forecast. There is a better chance of VLIFR to LIFR conditions at terminals north of Point Conception tonight.

KLAX . VLIFR conditions should improve to LIFR between 13Z and 15Z. IFR conditions could linger up to two hours past the forecasted improvement. There is a 50 percent chance of MVFR visibilities through the day. A return of LIFR to IFR conditions could arrive as soon as 01Z or as late as 04Z.

KBUR . VFR conditions are expected through the period. No wind impacts are expected at this time.

MARINE. 26/835 AM.

Overall, high confidence in forecast. Winds and seas are expected to remain below Small Craft Advisory (SCA) levels through Saturday.

Patchy dense fog with visibility one nautical mile or less at times is likely through this morning and potentially into the afternoon for the waters south of Point Conception. There is a 50% chance of more widespread dense fog across the entire coastal waters tonight. A Marine Weather Statement remains in effect through this morning and may need to be extended or reissued for tonight through Wednesday morning. Mariners should be prepared to reduce speeds and use GPS navigation if available.

LOX WATCHES/WARNINGS/ADVISORIES. CA . Heat Advisory in effect until 7 PM PDT Thursday for zone 37. (See LAXNPWLOX). Excessive Heat Warning in effect until 7 PM PDT Thursday for zone 59. (See LAXNPWLOX). PZ . NONE.

.HAZARD POTENTIAL OUTLOOK (THU-MON).

Hot temperatures are expected through Thursday, mainly away from the coast, which may lead to an increased risk for heat related illnesses for sensitive populations. Possible dense fog along the coast Thursday morning could create driving hazards.



PUBLIC . MW/Rorke AVIATION . Hall MARINE . Hall/Stewart SYNOPSIS . MW

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CPXC1 20 mi39 min S 1.9 G 2.9 59°F 1013.6 hPa55°F
46215 - Diablo Canyon, CA (076) 20 mi33 min 56°F5 ft
PSLC1 - 9412110 - Port San Luis, CA 20 mi45 min SSE 2.9 G 4.1 58°F 57°F1013.6 hPa
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 39 mi33 min WSW 3.9 G 5.8 56°F1013.2 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, CA15 mi37 minVar 410.00 miFair78°F54°F43%1012 hPa
Paso Robles Municipal Airport, CA16 mi40 minN 010.00 miFair79°F45°F30%1011.9 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hrE55SW6W4W7NW7W8NW10NW8W5W3NW3CalmCalmCalmCalmCalmCalmSE4CalmCalmCalmCalm4
1 day agoNW11NW14NW18NW13NW17NW14NW13NW11NW9S4CalmS3E4SE3SE3CalmSE4S3CalmCalmE3CalmCalmSE5
2 days ago4NW15NW14NW17NW16NW11NW15NW17NW15NW9NW5CalmSE3CalmSE3CalmCalmCalmCalmCalmCalmCalmNW43

Tide / Current Tables for Morro Beach, Estero Bay, California (2)
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Morro Beach
Click for Map
Tue -- 12:06 AM PDT     5.18 feet High Tide
Tue -- 05:51 AM PDT     Sunrise
Tue -- 07:50 AM PDT     -0.39 feet Low Tide
Tue -- 09:09 AM PDT     Moonrise
Tue -- 03:00 PM PDT     3.07 feet High Tide
Tue -- 06:27 PM PDT     2.65 feet Low Tide
Tue -- 08:09 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.254.43.52.41.30.3-0.2-0.4-0.10.51.222.633.132.82.72.72.93.33.94.4

Tide / Current Tables for Morro Beach, Estero Bay, California
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Morro Beach
Click for Map
Tue -- 12:06 AM PDT     5.18 feet High Tide
Tue -- 05:51 AM PDT     Sunrise
Tue -- 07:50 AM PDT     -0.39 feet Low Tide
Tue -- 09:09 AM PDT     Moonrise
Tue -- 03:00 PM PDT     3.07 feet High Tide
Tue -- 06:27 PM PDT     2.66 feet Low Tide
Tue -- 08:09 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.254.43.52.41.30.3-0.2-0.4-0.10.51.222.633.132.82.72.72.93.33.94.4

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 (13,3,4,5)
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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.