Saturday, March28, 2020
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Marine Weather and Tides
Cayucos, 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 6:52AMSunset 7:22PM Saturday March 28, 2020 1:45 PM PDT (20:45 UTC) Moonrise 8:25AMMoonset 10:32PM Illumination 23% Phase: Waxing Crescent; Moon at 5 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- 839 Am Pdt Sat Mar 28 2020
Today..N winds 5 to 10 kt, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 3 to 4 ft at 13 seconds. Slight chance of showers in the afternoon.
Tonight..NW winds 10 to 15 kt with local gusts to 20 kt in the evening, becoming 5 to 10 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 7 seconds. Slight chance of showers.
Sun..N winds 5 to 10 kt, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. W swell 3 to 5 ft at 7 seconds. Chance of showers.
Sun night..NW winds 10 to 15 kt, becoming 5 to 10 kt late. Wind waves 2 ft or less. NW swell 3 to 5 ft at 7 seconds.
Mon..N winds 5 to 10 kt, becoming nw 15 to 25 kt in the afternoon. Combined seas 4 to 6 ft dominant period 8 seconds.
Mon night..NW winds 15 to 25 kt in the evening, becoming N 10 to 15 kt late. Combined seas 4 to 6 ft dominant period 8 seconds.
Tue..NW winds 10 to 15 kt early, becoming 15 to 25 kt. Combined seas 5 to 7 ft.
Wed..NW winds 10 to 20 kt with local gusts to 25 kt. Wind waves 2 to 4 ft. NW swell 7 to 10 ft.
PZZ600 839 Am Pdt Sat Mar 28 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 1025 mb surface high was located 600 nm sw of point conception and a 1024 mb surface high was near Monterey. Little change can be expected through tonight.


7 Day Forecast for Marine Location Near Cayucos, CA
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location: 35.43, -120.88     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 281802 AAA AFDLOX

Area Forecast Discussion . UPDATED National Weather Service Los Angeles/Oxnard CA 1102 AM PDT Sat Mar 28 2020

updated aviation discussion

SYNOPSIS. 28/730 AM.

Cool and dry conditions will continue through this afternoon then there is a chance of light showers through late Sunday. Next week will be warm and dry with many locations reaching 80 degrees Tuesday and Wednesday.

SHORT TERM (TDY-MON). 28/936 AM.

Weak upper level trough developing off the coast of California today will bring increasing high clouds to the region today, while maintaining cool temperatures. While most of the lower level moisture and dynamics will stay well north of the area today, there is a slight chance of light showers north of Morro Bay by this afternoon. The weak upper trough will push through the region tonight through Sunday. There will be 20-40 percent pops with this system, mainly north of Point Conception as well as interior areas of LA/Ventura counties. The best chances of precipitation for these areas are expected to be Sunday afternoon. Any rain that does fall with this system is expected to be light, with totals less than a tenth of an inch. Snow levels will likely remain above 5000 feet and there will not be any snow issues over the major mountain passes.

*** From previous discussion ***

The trof passage will also usher in gusty NW winds over the Santa Barbara South Coast and Antelope Valley. On Sunday night the winds will shift more to the N as the trof continues to move to the east. The strongest winds will occur over the SBA South Coast, I-5 corridor, and western Antelope Valley. These areas will likely reach advisory levels.

Dry NW flow aloft sets up on Monday. Skies will likely be mostly sunny or at worst partly cloudy. Hgts rise to 576 DM. These hgts along with moderate offshore flow from the north will lead to a 4 to 8 degree jump in temps. Coast and vly temps will top out in the upper 60s to the mid 70s.

LONG TERM (TUE-FRI). 28/327 AM.

Both the EC and GFS agree that there will be dry NW flow over the area Tue and Wed and then weak ridging on Thu and Fri. It will be dry all four days.

There will be offshore flow from both the east and north on Tuesday and this will be the warmest day for the coasts and vlys. The warmest days for the interior will be Thu and Fri under the ridge.

All four days will have warmer than normal max temps and 70s will be the order of the day, but cannot rule out a few 80 degree readings in the warmest locations.

AVIATION. 28/1800Z.

At 1730Z at KLAX, there was no marine inversion.

Moderate to hi confidence in the 18Z TAFs. VFR conditions are expected at all the airfields thru early this evening, then MVFR cigs should develop at many of the coastal and vly airfields, with a 50%-60% chance of development. The cigs are expected to improve back to VFR for many of the airfields by early Sun morning, except may linger til late morning at KSBP and KSMX. The timing of onset and dissipation of the MVFR cigs may be off +/- an hour or two. Otherwise VFR conditions should prevail thru late Sun morning.

KLAX . Moderate to hi confidence in the 18Z TAF. VFR conditions are expected thru this evening, then MVFR cigs should develop 07Z-17Z, with a 60% chance of development. The cigs are expected to improve back to VFR aft 17Z Sun and continue thru Sun afternoon. The timing of onset and dissipation of the MVFR cigs may be off +/- an hour or two.

KBUR . Moderate to hi confidence in the 18Z TAF. VFR conditions are expected thru this evening, then MVFR cigs should develop 07Z-12Z, with a 60% chance of development. The cigs are expected to improve back to VFR aft 12Z Sun and continue thru late Sun morning. The timing of onset and dissipation of the MVFR cigs may be off +/- an hour or two.

MARINE. 28/840 AM.

Across the outer waters, Small Craft Advisory (SCA) winds and short period seas will cont thru late tonight for the southern two zones (PZZ673/676). There is a 30-40% chance that winds will reach SCA levels across the northern zone this afternoon/evening.

There is a 30-40% chance of SCA level winds Sun afternoon into Sun night, except SCA level winds are likely across the southern zone. SCA level winds are likely Mon thru Wed.

Across the inner waters north of Pt. Sal, there is a 20-30% chance of SCA level winds during the afternoon/evening hours today and Sun. SCA level winds are likely Mon thru Tue, then there is a 50% chance of SCA level winds Wed.

Across the inner waters south of Pt Conception, there is a 30% chance of SCA level winds across western portions of the SBA Channel this afternoon/evening. SCA level winds are likely across much of the area Sun afternoon/evening, then there is a 40% chance of SCA level winds Mon afternoon/evening.

Overall, there will be an extended period of hazardous short period seas under 9 seconds through at least early next week.

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

.HAZARD POTENTIAL OUTLOOK (MON-FRI).

No significant hazards expected.



PUBLIC . Gomberg/Rorke AVIATION . Sirard MARINE . DB/Sirard SYNOPSIS . Kj

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46215 - Diablo Canyon, CA (076) 16 mi45 min 62°F3 ft
CPXC1 19 mi27 min W 15 G 18 58°F 1022.4 hPa45°F
PSLC1 - 9412110 - Port San Luis, CA 19 mi45 min W 14 G 19 58°F 58°F1022.6 hPa (-1.6)
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 34 mi25 min NW 12 G 14 56°F 58°F1022.8 hPa48°F

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, CA18 mi49 minWNW 510.00 miFair63°F44°F50%1021.8 hPa
Paso Robles Municipal Airport, CA22 mi52 minN 010.00 miFair58°F39°F51%1022.2 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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W12NW14NW11NW11N7N6N4SE8N10
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NW7CalmCalmCalm3CalmE3CalmNW3W3W5NW5
1 day agoNW16NW15
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NW14W9NE5N4N4W3W7S4NW3CalmCalmCalmCalmCalmCalmCalmN4W7NW9NW9
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NW14W14W8NW7NW13N3CalmSE4S3SE3E3CalmCalm3CalmCalmSE3W3W9SW12NW12

Tide / Current Tables for Morro Beach, Estero Bay, California
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Morro Beach
Click for Map
Sat -- 12:31 AM PDT     4.49 feet High Tide
Sat -- 06:54 AM PDT     Sunrise
Sat -- 07:20 AM PDT     0.60 feet Low Tide
Sat -- 09:25 AM PDT     Moonrise
Sat -- 01:27 PM PDT     3.12 feet High Tide
Sat -- 06:33 PM PDT     1.69 feet Low Tide
Sat -- 07:22 PM PDT     Sunset
Sat -- 11:32 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.44.44.13.32.41.60.90.60.71.11.72.32.83.13.12.82.421.71.722.53.23.8

Tide / Current Tables for Port San Luis, California
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Port San Luis
Click for Map
Sat -- 12:27 AM PDT     4.71 feet High Tide
Sat -- 06:54 AM PDT     Sunrise
Sat -- 07:21 AM PDT     0.60 feet Low Tide
Sat -- 09:25 AM PDT     Moonrise
Sat -- 01:40 PM PDT     3.30 feet High Tide
Sat -- 06:37 PM PDT     2.00 feet Low Tide
Sat -- 07:21 PM PDT     Sunset
Sat -- 11:31 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.74.74.23.52.51.610.60.71.11.72.32.93.23.33.12.72.32.122.32.83.44

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Los Angeles/Oxnard, CA (16,3,4,5)
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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.