Thursday, September24, 2020
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Marine Weather and Tides
San Luis Obispo, 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 6:51AMSunset 6:57PM Thursday September 24, 2020 4:04 PM PDT (23:04 UTC) Moonrise 1:57PMMoonset 11:49PM Illumination 52% Phase: First Quarter Moon; Moon at 8 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- 215 Pm Pdt Thu Sep 24 2020
.small craft advisory in effect through Saturday morning...
Tonight..NW winds 15 to 25 kt with local gusts to 35 kt in the evening, becoming 10 to 20 kt with gusts to 25 kt. Combined seas 9 to 10 ft dominant period 17 seconds, building to 10 to 12 ft dominant period 15 seconds after midnight.
Fri..NW winds 15 to 25 kt with gusts to 30 kt by the afternoon. Combined seas 10 to 12 ft dominant period 15 seconds.
Fri night..NW winds 15 to 25 kt with gusts to 30 kt in the evening, becoming 15 to 20 kt. Combined seas 11 to 12 ft dominant period 15 seconds, subsiding to 9 to 11 ft dominant period 15 seconds after midnight.
Sat..N winds 10 to 15 kt, becoming nw 15 to 20 kt with gusts to 25 kt in the afternoon. Combined seas 7 to 9 ft dominant period 12 seconds.
Sat night..NW winds 15 to 25 kt with gusts to 30 kt in the evening, becoming N 5 to 10 kt. Combined seas 6 to 8 ft dominant period 11 seconds.
Sun..N winds 5 to 10 kt in the morning, becoming variable 10 kt or less. Wind waves 2 ft or less. NW swell 5 to 6 ft at 11 seconds.
Sun night..Winds variable 10 kt or less. Wind waves 2 ft or less. NW swell 5 to 6 ft at 11 seconds.
Mon..Winds variable 10 kt or less. Wind waves 2 ft or less. NW swell 5 to 6 ft.
Tue..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft.
PZZ600 215 Pm Pdt Thu Sep 24 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 20z, or 1 pm pdt, a 1021 mb surface high was located 700 nm west southwest of point conception. A 1008 mb thermal low was centered just south of los vegas. The high will strengthen today, causing nw winds to increase across the outer and northern coastal waters. Patchy dense fog with visibility one nautical mile or less will affect the waters this morning.


7 Day Forecast for Marine Location Near San Luis Obispo, CA
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location: 35.27, -120.66     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 242056 AFDLOX

Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 156 PM PDT Thu Sep 24 2020

SYNOPSIS. 24/1230 PM.

Locally gusty north winds will occur along the central coast, Santa Barbara south coast and mountains through Friday with slightly cooler temperatures. Morning low clouds and fog will be confined near the coast for Ventura and Los Angeles County. A significant warming trend is on tap beginning this weekend and continuing through next week.

SHORT TERM (TDY-SUN). 24/140 PM.

High pressure over the region today will flatten to our south on Friday as a shortwave trough slides across southwest CA. We've already seen offshore flow along the central coast today where temperatures jumped up to the upper 80s and lower 90s in non- typical areas like Pismo Beach and Port San Luis. This area remains the trickiest part of the forecast as northeast winds to 35 mph are likely again tonight, which will keep temperatures from falling like they normally would. Have bumped up Friday's highs in the area as a result. We should see an increase in ridgetop winds and surface gradients as the shortwave trough passes through, therefore, gusty northwest to northeast winds will occur across the Santa Ynez Range and in the San Gabriel Mountains tonight into Friday morning. Wind advisories are in effect with gusts of 45-50 mph in a few favored locations, slowest to subside across the I-5 corridor on Friday morning. Overall, temperatures will be cooler away from the downslope areas and there will be a weak eddy circulation to kick up the marine layer several hundred feet along the Ventura and Los Angeles County coasts late tonight and early Friday.

Very little change for Friday night and Saturday as heights remain the same (592dm) and only a slight tilt to the northwest flow aloft. There will continue to be northerly pressure gradients with locally gusty north to northeast winds for the Santa Ynez Range and the south Santa Barbara County coast, but below advisory levels. It will remain breezy in the I-5 corridor again Friday night. Areas of low clouds and fog for the south coastal area looks good for Saturday morning.

By Sunday, a 595dm high pressure center builds northward off the Oregon coast with our heights increasing 10dm and 950mb temperatures bumping up 1-2 degrees C. Pressure gradients will be trending weakly offshore which will also add some downslope warming in the typical valleys and coasts of Ventura and Los Angeles Counties. This will be the first day for a few valley locations to reach 100 degrees or so. There will be some early morning low clouds and fog for the south coasts on Sunday, but this will be the start of rather long duration heat event which will persist through the majority of next week.

LONG TERM (MON-THU). 24/139 PM.

Hot and dry conditions are likely to kick in over the entire state on Monday as the high pressure center moves into Oregon and the ridge extends down into Mexico. GEFS and ECMWF ensembles have been consistent with indicating 700-500mb heights outside of climatology for this time of the year on Monday. Heights will approach 594dm which is not what we experienced in mid-August, but rather unusual for late September. Pressure gradients will remain weakly offshore and humidities will be low. The marine layer should be about gone by Monday, so not expecting much coastal stratus by then. High temperatures will be in the 95-105 degree range for hotter valleys and the desert. Unfortunately the high pressure ridge stalls out over the entire West Coast allowing the heat to build through the week. For now, forecasts reflect the hottest days on Tuesday and Wednesday with only minor relief later in the week. Our local temperature forecasts are higher than the majority of deterministic model data, but that is the correct trend in this situation. There will be a few record-breaking temperatures possible during this event, even though it's not expected to be as hot as the early Sept heat wave. No heat watches are needed at this time, however, it's very likely that heat advisory levels will be reached in the valleys and possibly the mountains on the hotter days. The other weather factor next week will be the potential for large plume growth and rapid fire spread with any new or existing fires due to the weak instability and mixing heights above 10,000 ft each day.

AVIATION. 24/1829Z.

At 1720Z, the marine layer was around 800 ft deep at KLAX. The top of the inversion was around 1900 ft with a temperature of 23 C.

Expect low clouds to be confined to coastal sections of L.A. County and the Central Coast tonight. Conds should be IFR to LIFR across L.A. County and LIFR to VLIFR on the Central Coast.

KLAX . Moderate confidence in the 18Z TAF. There is a 30% chance that skies will remain clear tonight. There is a 30 percent chance of MVFR conditions by Friday morning.

KBUR . High confidence in the 18Z TAF with VFR conditions expected through the period.

MARINE. 24/141 PM.

Across the outer waters, Gale Force winds are expected across much of the area this afternoon, then continue into tonight. The Gale Force winds will continue Friday into Friday evening, and the Gale Warnings have been extended through Friday evening. Large seas will affect the outer waters later today through Saturday.

Across the inner waters north of Point Sal, SCA level winds are expected this afternoon and evening, and again Friday afternoon and evening. Seas will likely rise to near or above 10 feet tonight and remain above that level through Sat morning, so even when winds drop off, seas will be above SCA levels. Therefore, A SCA is in effect from this afternoon through Sat morning.

Across the inner waters south of Pt Conception, SCA level winds are expected across western portions of the Santa Barbara Channel late this afternoon through late tonight. Otherwise, SCA conds are not expected through Mon.

Patchy dense fog may affect the coastal waters tonight.

LOX WATCHES/WARNINGS/ADVISORIES. CA . High Surf Advisory in effect from 9 PM this evening to 9 AM PDT Saturday for zones 34-35. (See LAXCFWLOX). Wind Advisory in effect until 3 AM PDT Friday for zones 39-52. (See LAXNPWLOX). Wind Advisory in effect from 7 PM this evening to 11 AM PDT Friday for zones 53-54. (See LAXNPWLOX). PZ . Small Craft Advisory in effect until 9 AM PDT Saturday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 3 AM PDT Friday for zone 650. (See LAXMWWLOX). Gale Warning in effect until 9 PM PDT Friday for zones 670-673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (SUN-THU).

Dangerously hot weather and near critical fire weather conditions are possible all of next week as strong high pressure builds across southwest California.



PUBLIC . EB AVIATION . Sweet/DB MARINE . Sweet SYNOPSIS . EB

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CPXC1 8 mi28 min W 16 G 18 1012.4 hPa
PSLC1 - 9412110 - Port San Luis, CA 9 mi46 min W 17 G 20 84°F 61°F1012.5 hPa
46215 - Diablo Canyon, CA (076) 11 mi38 min 64°F5 ft
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 29 mi24 min NW 21 G 25 60°F1013.2 hPa
PTGC1 - Point Arguello, CA 48 mi64 min N 20 G 22 62°F 1013.2 hPa (-0.6)

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, CA2 mi3.1 hrsNW 1910.00 miClear and Breezy84°F53°F35%1013.5 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hrNW18--NW13NW11--------------------CalmN11
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--NW13NW11NW13NW19--NW20
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1 day agoNW13W10W9NW7Calm------------------SE5--CalmCalmCalmCalm3W6W8NW13
2 days agoNW6NW6NW9NW5NW4------------------S5Calm--Calm--SE4NW11W104NW7

Tide / Current Tables for Avila, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Avila
Click for Map
Thu -- 05:22 AM PDT     0.88 feet High Tide
Thu -- 06:52 AM PDT     Sunrise
Thu -- 09:59 AM PDT     -0.18 feet Low Tide
Thu -- 02:57 PM PDT     Moonrise
Thu -- 04:02 PM PDT     2.20 feet High Tide
Thu -- 06:55 PM PDT     Sunset
Thu -- 11:38 PM PDT     -2.84 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.2-1.5-0.60.10.60.90.80.60.2-0.1-0.2-00.30.91.622.221.50.6-0.4-1.4-2.3-2.7

Tide / Current Tables for Port San Luis Wharf, California
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Port San Luis Wharf
Click for Map
Thu -- 06:49 AM PDT     3.66 feet High Tide
Thu -- 06:52 AM PDT     Sunrise
Thu -- 10:51 AM PDT     3.12 feet Low Tide
Thu -- 02:57 PM PDT     Moonrise
Thu -- 05:00 PM PDT     5.09 feet High Tide
Thu -- 06:55 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.81.42.12.83.33.63.73.53.43.23.13.23.644.54.95.14.94.43.62.71.70.9

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
Ground Weather Radar Station Vandenberg AFB, CA
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