Wednesday, April1, 2020
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Marine Weather and Tides
San Luis Obispo, 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 6:48AMSunset 7:24PM Tuesday March 31, 2020 11:52 PM PDT (06:52 UTC) Moonrise 10:29AMMoonset 12:27AM Illumination 57% 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- 911 Pm Pdt Tue Mar 31 2020
.small craft advisory in effect through late Wednesday night...
Tonight..NW winds 15 to 25 kt with gusts to 30 kt in the evening, becoming 10 to 20 kt with gusts to 25 kt. Combined seas 8 to 11 ft dominant period 9 seconds.
Wed..NW winds 10 to 20 kt, becoming 15 to 25 kt with gusts to 30 kt by the afternoon. Combined seas 7 to 10 ft dominant period 9 seconds, building to 9 to 12 ft dominant period 9 seconds in the afternoon.
Wed night..NW winds 20 to 30 kt with gusts to 35 kt in the evening, becoming 15 to 25 kt with gusts to 30 kt. Combined seas 11 to 14 ft dominant period 10 seconds, subsiding to 9 to 11 ft dominant period 10 seconds after midnight.
Thu..N winds 10 to 15 kt with gusts to 20 kt, becoming nw 10 to 20 kt with gusts to 25 kt in the afternoon. Combined seas 7 to 10 ft dominant period 11 seconds.
Thu night..NW winds 15 to 20 kt with local gusts to 25 kt in the evening, becoming N 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 7 to 8 ft at 10 seconds.
Fri..N winds 10 to 15 kt with gusts to 20 kt, becoming nw 10 to 20 kt with local gusts to 25 kt in the afternoon. Wind waves 2 to 4 ft. NW swell 6 to 7 ft at 9 seconds.
Fri night..NW winds 15 to 25 kt with gusts to 30 kt in the evening, becoming 10 to 20 kt with gusts to 25 kt. Combined seas 6 to 8 ft dominant period 9 seconds.
Sat..NW winds 10 to 15 kt with gusts to 20 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft.
Sun..SW winds 10 to 15 kt. Wind waves 2 ft or less. W swell 4 to 6 ft. Chance of rain.
PZZ600 911 Pm Pdt Tue Mar 31 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 04z, or 9 pm pdt, a 1030 mb surface high remains around 900 nm west of point conception, while a 1007 mb thermal low was near the southern nevada-california border. Gale force winds are forecast through tomorrow over the outer waters with moderate west to northwest flow elsewhere.


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 010620 AFDLOX

Area Forecast Discussion . UPDATED National Weather Service Los Angeles/Oxnard CA 1120 PM PDT Tue Mar 31 2020

SYNOPSIS. 31/801 PM.

Conditions will be warm and dry through Saturday as high pressure resides in the region. By early next week, a pacific storm system will bring unsettled weather and a chance of rain. Temperatures will be cooler as the weak storm moves through, and any snow will be well above the major passes.

SHORT TERM (TUE-FRI). 31/944 PM.

Zonal flow continues over the region this evening as an upper- level high pressure system remains centered over the Pacific Ocean near 34N and 142W and a cold upper-level trough remains along the British Columbia coast. A weak disturbance moving up from the southwest, bringing high-level clouds today, will continue to move east tonight. A dying frontal boundary is producing gusty northwest to north winds across southern Santa Barbara County and through the Interstate 5 Corridor. Winds will continue to increase tonight and into Wednesday morning as a northerly surface pressure gradient continues to tighten.

With the northwest flow aloft, the pattern will remain open for troughiness to sneak in. Today was likely the warmest day of the week as 500 mb heights decline through the remainder of the week. A cooling trend will take shape on Wednesday.

PoPs will likely need to be boosted between Sunday and Monday by future shifts as the latest model solutions are trending more toward a wet weather pattern. The trough, currently located south of the Aleutian Islands, will lift out over the ridge in place, the dig southeast into the region.

***From Previous Discussion***

Winds will ease on Wednesday as a broad upper level trough sags southward over the state. Temperatures will cool a few degrees on Wednesday as well - roughly 3 to 5 degrees. Further cooling is expected on Thursday with lower 500 mb heights and cooler 850 mb temps as the upper trough sweeps through. The biggest drop in temperatures will be over the higher terrain.

LONG TERM (SAT-TUE). 31/901 PM.

No major change in the overall sensible weather on Friday as the upper trough exits to the east.

The upcoming weekend is still on the lower end of confidence as medium range models are still not in the best agreement. A weak area of low pressure swings through NorCal on Saturday bringing some rain to NorCal and the San Francisco Bay. The passing low to the north on Saturday may usher in some clouds and slightly cooler temperatures, but the forecast area will remain dry.

Quick on the heels of the passing low pressure system another stronger and more pronounced trough/low pressure will move through the state. This system will have a higher likelihood of rain early Sunday - first impacting SLO then spreading southward through the day. Rain chances will lingering into Monday. It should also be noted the system will be colder with snow levels in the 5-6k range.

Looking farther down the road CPC 6-10 outlook valid through April 10 keeps temperatures on the cooler side with additional rain chances.

AVIATION. 01/0619Z.

At 03Z at KLAX, there was no marine layer. There was a sfc based inversion with a top of 1500 feet with a temperature of about 19 C.

Good confidence in TAFs xcp KPRB, KSMX, KSBP, KSMO, KLAX and KLGB. There is a 20 percent chc of no cigs at KPRB and KLGB and if cigs do arrive the arrival time could be off by +/- 1 hour. There is a 30 percent chc of IFR cigs at KSMX, KSBP, KSMO, KLAX 11Z-16Z.

KLAX . Moderate confidence in TAF with a 30 percent chc of BKN007 11Z-16Z. There is a 30 percent chc of a 8 kt east wind component.

KBUR . High confidence in TAF. Lgt Turbc SFC-140 thru 15Z.

MARINE. 31/925 PM.

Moderate-to-high confidence in the current forecast overall. Small Craft Advisory (SCA) conditions are likely across much of the coastal waters through Thursday, except for portions of the southern California bight closest to shore.

For the waters northwest through southwest of the Channel Islands, moderate-to-high confidence in current forecast. Gale force winds will likely continue at times between Tuesday afternoon and late Wednesday night, especially for the waters out beyond 10 nm north of Point Sal. There is a 40-50 percent chance that Gales may linger into Thursday night.

Inside the southern California bight, moderate confidence in current forecast. For the western half of the Santa Barbara Channel, SCA level northwest winds will continue Tuesday through Saturday, mainly during the late afternoon and evening hours. Elsewhere, winds and seas are expected to remain below SCA levels through Friday, but there is a 40-50 percent chance of SCA level winds Wednesday afternoon and evening and Saturday afternoon and evening across western sections.

LOX WATCHES/WARNINGS/ADVISORIES. CA . Wind Advisory in effect until 3 AM PDT Wednesday for zones 39-52. (See LAXNPWLOX). Wind Advisory in effect until 11 AM PDT Wednesday for zones 53-54. (See LAXNPWLOX). PZ . Small Craft Advisory in effect until 3 AM PDT Thursday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 3 AM PDT Wednesday for zone 650. (See LAXMWWLOX). Gale Warning in effect until 3 AM PDT Thursday for zones 670-673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (FRI-TUE).

A storm system will likely bring wet roadways and gusty winds between Sunday and Monday.



PUBLIC . Hall/MM AVIATION . Rorke MARINE . Hall SYNOPSIS . Phillips/Sweet

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CPXC1 8 mi40 min N 7 G 9.9 66°F 1015.3 hPa48°F
PSLC1 - 9412110 - Port San Luis, CA 9 mi52 min NNW 6 G 8.9 67°F 57°F1015.3 hPa (-0.6)
46215 - Diablo Canyon, CA (076) 11 mi52 min 55°F4 ft
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 29 mi32 min NNW 21 G 27 57°F 57°F1015.3 hPa52°F
PTGC1 - Point Arguello, CA 48 mi52 min N 19 G 22 55°F 1014.3 hPa (-0.5)

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 mi56 minW 610.00 miFair54°F51°F90%1014.9 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hrSE3SE3NW4E43NW10W6E33W53NW11N13
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--NW16NW14NW14NW6NW6W6
1 day agoCalmCalmE5SE3CalmCalmNW5CalmCalmW7NW5NW6W6NW11NW18NW19NW20
G27
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NW11NW16NW12NW8NW6NW5
2 days agoNW5NW8W5W4W3NW3CalmCalmCalmCalm4NW7NW9NW8NW9NW12NW13NW14NW11NW9NW6W3SW4Calm

Tide / Current Tables for Avila, California
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Avila
Click for Map
Wed -- 02:24 AM PDT     Moonset
Wed -- 03:21 AM PDT     First Quarter
Wed -- 03:41 AM PDT     2.05 feet High Tide
Wed -- 06:48 AM PDT     Sunrise
Wed -- 11:46 AM PDT     -2.47 feet Low Tide
Wed -- 12:24 PM PDT     Moonrise
Wed -- 07:00 PM PDT     0.61 feet High Tide
Wed -- 07:24 PM PDT     Sunset
Wed -- 10:48 PM PDT     0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.21.7221.81.30.5-0.4-1.2-1.9-2.4-2.5-2.2-1.7-1-0.30.20.50.60.50.30.20.1

Tide / Current Tables for Port San Luis Wharf, California
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Port San Luis Wharf
Click for Map
Wed -- 02:24 AM PDT     Moonset
Wed -- 03:21 AM PDT     First Quarter
Wed -- 03:51 AM PDT     4.20 feet High Tide
Wed -- 06:48 AM PDT     Sunrise
Wed -- 12:22 PM PDT     0.37 feet Low Tide
Wed -- 12:24 PM PDT     Moonrise
Wed -- 07:25 PM PDT     Sunset
Wed -- 08:02 PM PDT     3.21 feet High Tide
Wed -- 11:36 PM PDT     2.90 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.43.63.94.14.24.13.73.22.51.81.10.60.40.40.71.21.82.42.83.13.23.232.9

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
Wind Forecast for Los Angeles/Oxnard, CA (2,6,7,8)
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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.