Friday, April3, 2020
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Marine Weather and Tides
Pismo Beach, 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 6:43AMSunset 7:27PM Friday April 3, 2020 3:30 PM PDT (22:30 UTC) Moonrise 1:33PMMoonset 3:07AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 214 Pm Pdt Fri Apr 3 2020
.small craft advisory in effect through late tonight...
Tonight..NW winds 15 to 25 kt with gusts to 30 kt in the evening, becoming N 5 to 15 kt. Combined seas 8 to 9 ft dominant period 8 seconds, subsiding to 7 to 8 ft after midnight.
Sat..N winds 5 to 15 kt, becoming nw 15 to 20 kt in the afternoon. Combined seas 6 to 7 ft dominant period 8 seconds.
Sat night..NW winds 10 to 20 kt in the evening, becoming sw 5 to 10 kt. Combined seas 5 to 6 ft dominant period 7 seconds, subsiding to 4 to 5 ft after midnight. Chance of rain after midnight.
Sun..S winds 10 to 20 kt, becoming 20 to 30 kt in the afternoon. Combined seas 4 to 6 ft dominant period 7 seconds. Rain likely in the morning, then rain.
Sun night..SW winds 20 to 30 kt in the evening, becoming W 10 to 15 kt. Combined seas 6 to 7 ft dominant period 10 seconds. Rain and slight chance of tstms in the evening, then rain likely.
Mon..W winds 5 to 10 kt. Wind waves 2 ft or less. W swell 5 to 6 ft at 9 seconds. Chance of rain. Slight chance of tstms in the afternoon.
Mon night..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell 5 to 6 ft. Chance of rain and slight chance of tstms.
Tue..W winds 10 to 15 kt. Wind waves 2 ft or less. W swell 5 to 6 ft. Chance of rain and slight chance of tstms.
Wed..NW winds 10 to 15 kt. Wind waves 2 ft or less. W swell 6 to 7 ft. Chance of rain.
PZZ600 214 Pm Pdt Fri Apr 3 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 21z, or 2 pm pdt, a 1030 mb surface high was 900 nm W of point conception. This high will persist through tonight, then push further off the coast over the weekend as a 1006 mb low pressure system pushes into northern california. Gale force winds off the coast, and widespread short period seas will continue into Saturday. Thunderstorms will be possible Sunday through Thursday.


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 032050 AFDLOX

Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 150 PM PDT Fri Apr 3 2020

SYNOPSIS. 03/1204 PM.

Onshore flow increases tonight as a Catalina Eddy brings low clouds back over most of the south coasts and valleys. Saturday will see increasing high clouds as a storm system approaches southern California. Moderate to heavy rain will overspread the area Sunday night through Monday with lingering rain and mountain snow showers Monday night through Thursday.

SHORT TERM (TDY-MON). 03/147 PM.

Quiet before the storm as the saying goes. Nice sunny conditions today with mild temperatures and very little to complain about. A few clouds have lingered over the LA Basin today following the weak marine inversion from last night. Winds are a little gusty through the highway 14 corridor into the Antelope Valley and along the central coast . gusts to 40 mph near Poppy Park and 35 mph near Gaviota. Expect an offshore pressure gradient to help winds remain gusty west of Goleta on the south SBA coast this evening, diminishing after midnight.

Saturday morning will be mostly cloudy with patchy fog across most beaches and valleys from LA to Ventura County and will likely push into Santa Barbara by sunrise. A rather strong eddy circulation near Catalina Eddy will be responsible to this return of low clouds. Morning clouds will knock a few degrees off the afternoon highs from what we are experiencing today. Northern areas will see increasing high clouds Saturday afternoon as a low pressure trough develops north of California.

Sunday is our transition day as low pressure near the Oregon coast merges with a much colder trough dropping down the British Columbia coast. Also, a storm system over the central Pacific is very active with thunderstorms today and this is where much of our moisture will originate from for Sunday night and Monday. A rather organized cold front will push southward from the Bay Area Saturday night with light rain developing across San Luis Obispo County early Sunday. As colder air aloft builds into the region, the cold front will become a little steeper as lapse rates increase and southerly flow increases. This will result in a significant rain band with moderate orographic flow into our mountain ranges by Sunday evening. Between 6pm-midnight the SBA County foothills/mountains will be seeing moderate to heavy rain which will spread southward across Ventura County overnight and into LA County by Monday morning. Embedded isolated thunderstorms will be possible along and near the front during this time period.

To complicate matters, both the NAM and GFS models are showing another disturbance rotating into the base of the low pressure on Monday. This slows the front down as the trough axis pivots more north-south and temporarily aligns with the surface features. The slower southward movement favors steady moderate to heavy rain over the eastern LA County for a longer duration, therefore, higher rain amounts in the foothills/mountains. In total it may take a solid 24-hours to see the steady rain and front traverse from our northern counties to the eastern LA County line.

There will be a break in the steady rain to the more convective showery-type rainfall by afternoon (north) and evening (south) on Monday. Models do indicate strong diffluent flow and another potential round of showers and isolated thunderstorms increasing Monday night into Tuesday morning as the upper low moves closer to southwest CA.

Rainfall totals look good overall with 0.75-1.5" for coasts and valleys, especially Ventura and LA, and 1.5-3.0" for foothills and mountains through Monday night. This amount of rain could meet or exceed our normal amount during a typical month of April, in just one-day. Rain rates will mostly be in the 0.25-0.50"/hour range with local rates over 0.75"/hr in heavier cells. This should not be a significant threat for recent burn scars, but minor debris will be possible. Snow levels will begin above 5500 feet Sunday night-Monday, then fall closer to 4500 feet by Tuesday morning. Think the main accumulations will remain above 6k feet, but some local amounts will be possible near Tejon Pass at some point on Tuesday. A winter storm watch may be needed in the day or so.

LONG TERM (TUE-FRI). 03/139 PM.

Both Tuesday and Wednesday will remain cold and unstable with a fairly good chance of showers developing each day after a little heating, and some of those showers could be heavy and contain small hail or ice pellets. Temperatures aloft range from -28 to -31 degrees C so it doesn't take much to get towering cumulus with ice and a lightning flash or two. The main impact will likely be low snow levels between 4-4.5k feet for the duration and travel problems over mountain passes, including the Grapevine at times. Confidence in the forecast goes down on Thursday due to the timing issues with the low pressure system. If it hangs around there could be additional showers, but the trend looks to be a decreasing threat of showers by Thursday afternoon/evening.

Friday would appear to be a drier day with high pressure building into the west coast and the low finally shifting to the east. Warmer and dry conditions expected into next weekend.

AVIATION. 03/1839Z.

At 17Z at KLAX, the marine layer was 4000 feet. The top of the weak inversion was at 5000 feet and 8 degrees C.

Moderate to high confidence of VFR conditions everywhere through 03Z, with SKC-SCT020. Low-moderate confidence in timing, categories, and coverage of stratus tonight into Saturday. Clouds could be solid in coverage, or spotty with many breaks due to possibilty weak inversion.

KLAX . High confidence in VFR prevailing through 04Z. Moderate confidence in presence of CIGS, low confidence in timing with a projected start time between 03Z and 09Z. Moderate confidence in CIGS at MVFR. East winds are likely, with a 40 percent chance of exceed 8 KT, best chance 10-16Z.

KBUR . High confidence in VFR prevailing through 06Z. Moderate confidence in presence of CIGS, low confidence in timing with a projected start time between 06Z and 12Z. Moderate confidence in CIGS at MVFR. Southeast winds will be prevalent through the night into Saturday.

MARINE. 03/914 AM.

High confidence in Gale Force winds through tonight off the Central Coast down to San Nicolas Island, with Small Craft Advisory (SCA) winds bleeding into the nearshore waters of the Central Coast and the western half of the Santa Barbara Channel. The rest of the waters may need a SCA for short period seas, but more probable the seas will stay just under those thresholds. High confidence NW winds will decrease quickly on Saturday, allowing for enhanced SE winds from Orange to Santa Barbara Counties, including the San Pedro Channel and Anacapa Passage.

A storm system is still on target to impact the area Sunday through Wednesday. Thunderstorms will be possible any time, but especially Tuesday and Wednesday. South wind gusts between 25 and 35 kt are also possible Sunday into early Monday anywhere as the system moves down the coast.

LOX WATCHES/WARNINGS/ADVISORIES. CA . NONE. PZ . Small Craft Advisory in effect until 3 AM PDT Saturday for zones 645-650. (See LAXMWWLOX). Small Craft Advisory in effect until 3 PM PDT this afternoon for zones 670-673-676. (See LAXMWWLOX). Gale Warning in effect until 11 PM PDT this evening for zone 670. (See LAXMWWLOX). Gale Warning in effect until 4 AM PDT Saturday for zones 673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (MON-FRI).

Rain, possibly heavy at times, and mountain snow above 5000 feet are expected Monday. Numerous rain and mountain snow showers are expected with possible thunderstorms Tuesday to Wednesday. Showers will decrease on Thursday. Impacts will include minor urban flooding and difficult mountain travel.



PUBLIC . EB AVIATION . Kittell MARINE . Kittell SYNOPSIS . EB

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 mi43 min WNW 18 G 23 59°F 55°F1015.3 hPa
CPXC1 10 mi33 min WNW 18 G 21 60°F 1015.5 hPa43°F
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 13 mi31 min NW 23 G 27 54°F 55°F1016.3 hPa46°F
46215 - Diablo Canyon, CA (076) 13 mi61 min 55°F6 ft
PTGC1 - Point Arguello, CA 32 mi31 min NNW 26 G 29 52°F 1015.2 hPa (-1.7)
HRVC1 39 mi43 min 53°F 1016.4 hPa
46218 - Harvest, CA (071) 40 mi31 min 56°F10 ft
46259 42 mi31 min 57°F11 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
San Luis Obispo, San Luis Obispo County-Mc Chesney Field, CA17 mi35 minWNW 1910.00 miFair and Breezy60°F45°F58%1015.1 hPa
Santa Maria Public Airport/Capt G Allan Hancock Field, CA20 mi40 minWNW 18 G 267.00 miBlowing Dust and Breezy60°F46°F60%1015.1 hPa
Lompoc, Vandenberg Air Force Base, CA23 mi93 minN 22 G 278.00 miFair and Breezy57°F46°F68%1016.6 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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NW7W6NW8NW12NW11NW9NW11W9W12NW18NW18NW19
1 day agoNW18NW19
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NW17NW14NW11NW7CalmCalmCalmW3W6CalmN14
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2 days agoNW17
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Tide / Current Tables for Avila, California
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Avila
Click for Map
Fri -- 12:14 AM PDT     -0.15 feet Low Tide
Fri -- 04:06 AM PDT     Moonset
Fri -- 06:07 AM PDT     2.15 feet High Tide
Fri -- 06:46 AM PDT     Sunrise
Fri -- 01:28 PM PDT     -2.78 feet Low Tide
Fri -- 02:32 PM PDT     Moonrise
Fri -- 07:26 PM PDT     Sunset
Fri -- 08:11 PM PDT     1.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.10.30.81.41.92.121.50.6-0.4-1.5-2.3-2.7-2.7-2.2-1.4-0.50.411.21.10.70.2

Tide / Current Tables for Port San Luis Wharf, California
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Port San Luis Wharf
Click for Map
Fri -- 01:01 AM PDT     2.44 feet Low Tide
Fri -- 04:06 AM PDT     Moonset
Fri -- 06:46 AM PDT     Sunrise
Fri -- 06:48 AM PDT     4.75 feet High Tide
Fri -- 02:03 PM PDT     -0.44 feet Low Tide
Fri -- 02:32 PM PDT     Moonrise
Fri -- 07:26 PM PDT     Sunset
Fri -- 08:41 PM PDT     4.01 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.42.633.64.24.64.74.53.82.81.60.6-0.2-0.4-0.20.51.42.53.43.943.73.1

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 (18,4,5,8)
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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.