Sunday, September20, 2020
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Marine Weather and Tides
Pismo Beach, 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 6:48AMSunset 7:02PM Sunday September 20, 2020 3:08 AM PDT (10:08 UTC) Moonrise 9:32AMMoonset 8:33PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 218 Am Pdt Sun Sep 20 2020
Today..Winds variable 10 kt or less, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 4 to 5 ft at 8 seconds. Patchy dense fog with vsby 1 nm or less in the morning.
Tonight..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 8 seconds. Patchy fog after midnight.
Mon..Winds variable 10 kt or less, becoming nw 10 kt in the afternoon. Wind waves 2 ft or less. NW swell 3 to 5 ft at 8 seconds. Patchy fog in the morning.
Mon night..NW 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 8 seconds. Patchy fog after midnight.
Tue..Winds variable 10 kt or less, becoming nw 10 kt in the afternoon. Wind waves 2 ft or less. NW swell 3 to 4 ft at 8 seconds. Patchy fog in the morning.
Tue night..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 4 to 5 ft at 10 seconds. Patchy fog after midnight.
Wed..NW winds 15 to 20 kt with gusts to 25 kt. Combined seas 4 to 6 ft.
Thu..NW winds 15 to 20 kt with gusts to 25 kt. Combined seas 7 to 10 ft.
PZZ600 218 Am Pdt Sun Sep 20 2020
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 1023 mb high pressure center was located 1200 nm west of point conception and a 1006 mb thermal low was over the gulf of california. Little change in this weather pattern can be expected through Tuesday. Patchy dense fog will likely affect the coastal waters during the night through morning hours into at least Tuesday.


7 Day Forecast for Marine Location Near Pismo Beach, CA
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location: 35.03, -120.79     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 200621 AFDLOX

Area Forecast Discussion . UPDATED National Weather Service Los Angeles/Oxnard CA 1121 PM PDT Sat Sep 19 2020

SYNOPSIS. 19/714 PM.

Temperatures will cool through Monday then warm again late next week. There will be gusty northerly winds across southern Santa Barbara County tonight along with gusty onshore winds this weekend across the LA county mountains and Antelope Valley. Night through morning low clouds and fog will expand into most coastal and lower valley areas by Monday.

SHORT TERM (SAT-TUE). 19/740 PM.

***UPDATE***

The marine inversion early this evening was around 900 ft deep at LAX and near 1000 ft deep at VBG. Low clouds were expanding along the Central Coast this evening and will continue there overnight. Low clouds should also develop over the SoCal Bight later tonight and move into the L.A. and possibly VTU County coast late tonight. With the shallow marine inversion, there should also be patchy dense fog with the low clouds overnight, especially along the Central Coast. Otherwise, mostly clear skies can be expected across the region thru the night.

Some northerly pressure gradients this evening across SBA County (NAM fcst SBA-SMX -2.3 mb at 06Z) will help to continue gusty NW to N canyon winds across the SBA County S coast and Santa Ynez Mtns mainly west of Goleta. Gusts up to 44 mph have been observed at the Gaviota RAWS, and up to 41 mph at the Refugio RAWS. These wind gusts will likely persist thru late tonight, and a Wind Advisory is in effect for this area thru 3 AM. Please see the latest Non-Precipitation Weather Message (LAXNPWLOX) for further details.

***From Previous Discussion***

The main weather impact through the weekend will be the the gusty south to southwest winds across the San Gabriel mountains and Antelope Vally impacting the Bobcat Fire. Wind gusts of 25 to 35 mph will be common in these areas, with isolated gusts up to 40 mph each afternoon in the foothills of the Antelope Valley. Also of note is the upper level winds shifting to a south to southeast trajectory overnight into Sunday morning which could bring increased smoke into Palmdale and Lancaster. The gusty onshore winds combined with low humidities will continue to bring elevated to brief critical fire weather concerns to the Bobcat fire area through the weekend.

Neither the eddy or the onshore push will be strong enough to preclude total clearing and Sunday will be totally sunny by late morning. The deeper marine layer and stronger onshore flow will bring 2 to 4 degrees of cooling to the coasts and vlys, with little change in temperatures across the interior.

On Monday . a weak 584 DaM trof ripples over the area. It will lift the marine layer across most of the coast and the lower vlys. Aside from the morning stratus (which will linger a little longer than Sunday) it will be a sunny day. The lower hgts and deeper marine layer will knock another 2 to 4 degrees off of the max temps. The coasts and vlys will end 1 to 3 degrees below normal while the interior will come in 1 to 3 degrees above normal. Little change in marine layer coverage and temperatures expected on Tuesday.

LONG TERM (WED-SAT). 19/213 PM.

The EC and GFS continue to agree that an upper level high pressure system will move into SW California from the SW on Wednesday and Thursday and then subside on Fri. This ridge of high pressure combined with weak offshore flow near the surface will likely generate a warming trend Wednesday into Thursday. The marine layer clouds will be greatly diminished on Wednesday and non existent on Thursday and Friday. Thursday will be the warmest day of the next 7 with max temps 4 to 8 degrees above normal. A cooling trend is then expected Friday into Saturday as the upper level ridge shifts eastward.

AVIATION. 20/0619Z.

At 0515Z at KLAX, the marine layer was 900 ft deep. The top of the inversion was at 2300 feet and a temperature of 27 C.

Moderate confidence in coastal TAFs and good confidence in inland TAFs.

Cstl TAFs KSBA and south flight cat transitions could be off by +/- 90 minutes. There is a 20 percent chc of LIFR cig/vis 11Z- 15Z.

KSMX and KSBP flight cat change timing could be off by +/- 90 minutes. KSMX and KSBP have a 30 percent chc of 1/4SM VV001 11Z- 15Z.

KLAX . High confidence in TAF through 11Z, then moderate confidence. Flight cat transitions could be off by +/- 90 minutes. There is a 20% chance of 2SM OVC004 11Z-15Z. High confidence that there will be no east wind component greater than 4 kt.

KBUR . High confidence in TAF.

MARINE. 19/728 PM.

Across the outer waters . Small Craft Advisory (SCA) level winds will continue through late tonight. There is a 20%-30% chance of SCA conditions continuing through Sunday evening. SCA level winds are likely again Tuesday through Wednesday across much of the outer waters, possibly beginning as early as Mon night.

Across the nearshore waters of the Central Coast, local SCA level winds are expected this evening. Otherwise, good confidence that conditions will remain below SCA levels through Wed morning. SCA conds are likely during the afternoon and evening hours Wed and Thu.

Across the inner waters south of Point Conception, there is a 30% chance of SCA conds across the western portions of the SBA Channel late Wed afternoon into Wed night. Otherwise and elsewhere, good confidence that conditions will remain below SCA levels through Thu.

Patchy dense fog will affect the coastal waters during the night through morning hours into at least Tue.

LOX WATCHES/WARNINGS/ADVISORIES. CA . Wind Advisory in effect until 3 AM PDT Sunday for zones 39-52. (See LAXNPWLOX). PZ . Small Craft Advisory in effect until 3 AM PDT Sunday for zones 670-673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (TUE-SAT).

No significant hazards expected.



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

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSLC1 - 9412110 - Port San Luis, CA 10 mi51 min E 1.9 G 1.9 56°F 59°F1012.3 hPa
CPXC1 10 mi33 min NE 1.9 G 2.9 1012.4 hPa
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 13 mi29 min NW 16 G 19 61°F1011.6 hPa
46215 - Diablo Canyon, CA (076) 13 mi43 min 55°F5 ft
PTGC1 - Point Arguello, CA 32 mi69 min N 18 G 20 55°F 1010.7 hPa (-0.5)
HRVC1 39 mi51 min 56°F 1011.6 hPa
46218 - Harvest, CA (071) 40 mi43 min 57°F7 ft
46259 42 mi43 min 62°F7 ft

Wind History for Port San Luis, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Maria Public Airport/Capt G Allan Hancock Field, CA20 mi18 minN 00.75 miFog/Mist55°F53°F93%1011.9 hPa
Lompoc, Vandenberg Air Force Base, CA23 mi11 minENE 30.63 miFog/Mist54°F53°F98%1012 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hr--------------------Calm----NW16
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--NW9NW12NW18NW19
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1 day ago--------------------CalmCalmCalmCalm3NW7NW14NW16--NW21
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2 days ago--------------------E4CalmCalmSE3CalmNW4CalmCalmW9NW7CalmNW9W4W3

Tide / Current Tables for Avila, California
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Avila
Click for Map
Sun -- 12:12 AM PDT     1.98 feet High Tide
Sun -- 06:14 AM PDT     -1.94 feet Low Tide
Sun -- 06:49 AM PDT     Sunrise
Sun -- 10:32 AM PDT     Moonrise
Sun -- 12:27 PM PDT     2.45 feet High Tide
Sun -- 07:01 PM PDT     Sunset
Sun -- 07:01 PM PDT     -2.43 feet Low Tide
Sun -- 09:32 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.81.20.3-0.8-1.6-1.9-1.8-1.2-0.211.92.42.41.80.9-0.3-1.4-2.1-2.4-2.2-1.5-0.50.5

Tide / Current Tables for Port San Luis Wharf, California
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Port San Luis Wharf
Click for Map
Sun -- 12:29 AM PDT     5.07 feet High Tide
Sun -- 06:24 AM PDT     0.96 feet Low Tide
Sun -- 06:49 AM PDT     Sunrise
Sun -- 10:32 AM PDT     Moonrise
Sun -- 12:38 PM PDT     5.88 feet High Tide
Sun -- 07:01 PM PDT     Sunset
Sun -- 07:21 PM PDT     0.25 feet Low Tide
Sun -- 09:32 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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554.43.52.41.511.11.72.845.15.75.85.34.331.80.80.30.411.93

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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