Thursday, October1, 2020
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Marine Weather and Tides
Cayucos, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:56AMSunset 6:47PM Thursday October 1, 2020 9:14 AM PDT (16:14 UTC) Moonrise 6:09PMMoonset 5:41AM Illumination 100% Phase: Full Moon; Moon at 14 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- 321 Am Pdt Thu Oct 1 2020
Today..N winds 5 to 10 kt, becoming nw 10 to 15 kt with gusts to 20 kt in the afternoon. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 11 seconds.
Tonight..NW winds 10 to 20 kt in the evening, becoming 5 to 10 kt late. Wind waves 1 to 3 ft. W swell 4 to 6 ft at 12 seconds, becoming nw and building to 6 to 7 ft at 13 seconds after midnight.
Fri..N winds 5 to 10 kt, becoming nw 15 to 25 kt in the afternoon. Combined seas 6 to 8 ft dominant period 15 seconds.
Fri night..NW winds 15 to 25 kt in the evening, becoming 10 to 15 kt. Combined seas 6 to 7 ft dominant period 14 seconds.
Sat..NW winds 10 to 15 kt, becoming nw 10 to 20 kt in the afternoon. Wind waves 2 to 3 ft. NW swell 5 to 7 ft at 12 seconds.
Sat night..NW winds 10 to 20 kt, becoming 5 to 10 kt. Wind waves 2 to 3 ft. NW swell 5 to 7 ft at 12 seconds. Patchy fog after midnight.
Sun..NW winds 10 to 15 kt with gusts to 20 kt. Wind waves 1 to 3 ft. NW swell 6 to 8 ft. Patchy fog.
Mon..NW winds 10 to 15 kt. Wind waves 2 ft. NW swell 5 to 6 ft. Patchy fog.
PZZ600 321 Am Pdt Thu Oct 1 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 10z, or 3 am pdt, a 1025 mb high was centered in utah with a ridge extending to a 1022 mb high about 200 nm west of seattle. A 1008 mb thermal low was centered in arizona. The high off seattle with move southward and strengthen through Friday.


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 011541 AFDLOX

Area Forecast Discussion . UPDATED National Weather Service Los Angeles/Oxnard CA 841 AM PDT Thu Oct 1 2020

SYNOPSIS. 01/237 AM.

Strong high pressure along with light offshore flow will result in very hot temperatures in most areas through the end of the week. Temperatures will begin to cool slightly by Friday but will remain well above normal through the weekend.

SHORT TERM (TDY-SAT). 01/840 AM.

***UPDATE***

Almost a carbon copy of yesterday to start out with temperatures of 80 degrees to around 90 in the foothill communities and even many coastal locations (83 at Morro Bay, 84 Pismo Beach, 85 Ventura, etc.). Offshore pressure gradients is very much the same as on Wednesday morning, however, winds have backed off a little quicker in the typical windy corridors and ridges. Still have a few northeast gusts to 25 mph at Porter Ranch, Whitaker Peak, and Wiley Ridge. There is a high layer of smoke making a bigger presence across southwest CA this morning mainly from fires in the Sierra. It will be much hazier and unpleasant today due to the smoke, but really have no impact to the high temperatures. This remains a dangerous heat wave with an excessive heat warning in place through 8pm for the inland valleys where highs will reach 105-110 degrees, especially Woodland Hills and Ojai. All other areas will remain in a heat advisory through Friday with highs today well into the 90s to lower 100s. Many new record highs are anticipated today which is why it is important to take this late season heat very seriously. Reduce outdoor exercise or strenuous work during the hottest part of the day between 10am- 7pm, drink more water, and find cooling centers or an air conditioned building. Onshore pressure gradient trends will be 1 mb stronger this afternoon, so hopefully coastal areas will start to cool earlier in the evening.

There will be offshore breezes returning to most areas late tonight which will keep the foothills and ridges warm again for Friday morning. Overall, tomorrow will be a cooler day near the ocean, but remain well above normal and hot again for inland valleys.

***From Previous Discussion***

Onshore trends and slight hgt falls will bring 5 to 7 degrees of cooling to the coasts and lower vlys with 2 to 4 degrees of cooling elsewhere. Enough cooling to eliminate the excessive heat warnings but not enough to eliminate the need for heat advisories.

The ridge settles southward on Saturday and weakens some. Hgts fall to about 588 DaM. More importantly the onshore flow increases a little more. (Still not enough to bring any marine layer to the coasts) There will be 4 to 5 degrees cooling everywhere except the Central Coast which will see 5 to 10 degrees of cooling. The beaches and near coastal areas will fall to 3 to 5 degrees above normal but areas further inland will still be 10 to 15 degrees above normal.

LONG TERM (SUN-WED). 01/256 AM.

The EC no longer agrees with the GFS and now develops an oddly persistent dry upper low off of Pt Conception. This soln does not not agree with the preponderance of the ensemble forecast members and its soln was discounted.

The GFS seems much more reasonable GFS soln which calls for the west coast ridge to weaken each day Tuesday and then to move eastward Wed and Thu as an east Pac trof moves in from the west.

More importantly moderate onshore flow returns which will bring back the marine layer and the night through morning marine layer clouds. Look for another round of 4 to 8 degrees of cooling. On Monday there will be an additional 2 to 3 degrees of cooling. Temps will then not change much Tue and Wed. Even with all the cooling max temps on Monday will remain 5 to 10 degrees above normal.

If the GFS is correct in its day 7 to 10 forecast there will be substantial cooling at the end of next week as a larger trof swings through west coast bringing possible rain as far south as Monterey county.

AVIATION. 01/1149Z.

At 12Z at KLAX, there was no marine layer. There was a sfc based inversion with a top near 23500 ft with a temp of 35 C.

Clear skies with VFR conditions expected across the entire region through the period.

KLAX . High confidence in the 12Z CAVU TAF. Good confidence that there will be no east wind component greater than 5 kt.

KBUR . High confidence in the 12Z CAVU TAF.

MARINE. 01/500 AM.

For the outer waters, conds have dropped below Small Craft Advisory (SCA) levels and are expected to remain so thru early to mid afternoon. Then, SCA conds are likely this afternoon thru late into the weekend. There is a 30% chance for occasional Gale force wind gusts late Fri or Friday evening into Sat evening.

For the inner waters N of Pt. Sal, there is a 40% chance of SCA level during the afternoon and evening hours today and Sat. SCA level winds are likely during the afternoon and evening hours Fri.

For the inner waters S of Pt. Conception, there is a 30-40% chance of SCA level NW to W winds across western portion of the Santa Barbara Channel this afternoon/evening and again Fri afternoon and evening. Otherwise, SCA conds are not expected thru Mon.

LOX WATCHES/WARNINGS/ADVISORIES. CA . Heat Advisory in effect until 8 PM PDT Friday for zones 34>41-51>54-88. (See LAXNPWLOX). Excessive Heat Warning in effect until 8 PM PDT this evening for zones 44>46-547. (See LAXNPWLOX). Heat Advisory in effect from 8 PM this evening to 8 PM PDT Friday for zones 44>46-547. (See LAXNPWLOX). Red Flag Warning in effect until 9 AM PDT this morning for zones 239-252. (See LAXRFWLOX). PZ . Small Craft Advisory in effect from 3 PM this afternoon to 3 AM PDT Monday for zone 670. (See LAXMWWLOX). Small Craft Advisory in effect until 3 AM PDT Monday for zones 673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (SAT-WED).

No significant hazards expected.



PUBLIC . EB/Rorke AVIATION . DB MARINE . DB SYNOPSIS . EB/Smith

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSLC1 - 9412110 - Port San Luis, CA 19 mi74 min 68°F 62°F1014.6 hPa (+0.5)
CPXC1 19 mi62 min NNE 1 G 1.9 68°F 1014.8 hPa51°F
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 34 mi54 min NNE 1.9 G 3.9 62°F1014.3 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, CA18 mi78 minE 310.00 miClear68°F48°F49%1014.9 hPa
Paso Robles Municipal Airport, CA22 mi21 minN 010.00 miFair65°F44°F47%1016.8 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hrCalmW4NW7NE9
G19
--NW13NW14--NW6W5--------------------CalmSE4E3SE3
1 day agoCalm--4W10--NW10NW13--NW10NW7NW6------------------------Calm
2 days agoCalm------W5------NW8--NW3------------------SW3--Calm--

Tide / Current Tables for Morro Beach, Estero Bay, California
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Morro Beach
Click for Map
Thu -- 04:32 AM PDT     0.46 feet Low Tide
Thu -- 06:41 AM PDT     Moonset
Thu -- 06:58 AM PDT     Sunrise
Thu -- 10:44 AM PDT     4.94 feet High Tide
Thu -- 02:06 PM PDT     Full Moon
Thu -- 04:45 PM PDT     0.91 feet Low Tide
Thu -- 06:46 PM PDT     Sunset
Thu -- 07:08 PM PDT     Moonrise
Thu -- 10:47 PM PDT     4.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.33.32.11.10.50.5123.14.14.84.94.53.72.71.71.10.91.32.13.14.14.74.9

Tide / Current Tables for Port San Luis, California
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Port San Luis
Click for Map
Thu -- 04:21 AM PDT     0.69 feet Low Tide
Thu -- 06:40 AM PDT     Moonset
Thu -- 06:58 AM PDT     Sunrise
Thu -- 10:35 AM PDT     4.97 feet High Tide
Thu -- 02:06 PM PDT     Full Moon
Thu -- 04:38 PM PDT     1.22 feet Low Tide
Thu -- 06:45 PM PDT     Sunset
Thu -- 07:07 PM PDT     Moonrise
Thu -- 10:39 PM PDT     4.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.23.12.11.20.70.81.42.33.44.34.94.94.53.72.71.81.31.31.72.43.44.24.74.8

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
Ground Weather Radar Station Vandenberg AFB, CA
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