Sunday, January17, 2021
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Marine Weather and Tides
Casmalia, 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 7:06AMSunset 5:17PM Sunday January 17, 2021 4:32 PM PST (00:32 UTC) Moonrise 10:21AMMoonset 10:05PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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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PZZ673 Waters From Pt. Sal To Santa Cruz Island Ca And Westward 60 Nm Including San Miguel And Santa Rosa Islands- 235 Pm Pst Sun Jan 17 2021
.small craft advisory in effect through late Monday night...
Tonight..NW winds 10 to 15 kt, becoming 15 to 20 kt after midnight. Wind waves 2 to 3 ft. NW swell 8 to 10 ft at 17 seconds.
Mon..NW winds 15 to 25 kt with local gusts to 30 kt. Strongest northwestern portion. Combined seas 11 to 14 ft dominant period 20 seconds.
Mon night..NW winds 15 to 25 kt with gusts to 30 kt after midnight. Strongest northwestern portion. Combined seas 10 to 12 ft dominant period 18 seconds.
Tue..Northwestern portion, N winds 20 to 30 kt becoming 15 to 25 kt in the afternoon. Elsewhere, N winds 15 to 20 kt. Combined seas 10 to 11 ft dominant period 16 seconds.
Tue night..N winds 15 to 20 kt with gusts to 25 kt, becoming ne 10 to 15 kt with gusts to 20 kt after midnight. Wind waves 2 to 4 ft. NW swell 8 to 9 ft at 15 seconds, subsiding to 7 ft at 14 seconds after midnight.
Wed..N winds 15 to 20 kt, becoming 10 to 15 kt in the afternoon. Wind waves 2 to 3 ft. NW swell 5 to 6 ft at 14 seconds.
Wed night..NW winds 10 to 15 kt. Wind waves 2 ft or less. NW swell 4 to 5 ft at 14 seconds.
Thu..NW winds 15 to 20 kt with gusts to 25 kt. Combined seas 6 to 7 ft.
Fri..NW winds 15 to 20 kt with gusts to 25 kt. Combined seas 8 to 11 ft. Slight chance of rain.
PZZ600 235 Pm Pst Sun Jan 17 2021
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 22z, or 2 pm pst, a 1035 mb high pressure center was located 550 nm northwest of eureka ca and a 1016 mb low pressure center was located 300 nm south of san diego. Large northwest swells will keep wave heights near or above 10 ft for the outer waters into Tuesday. Gale force northeast winds will likely affect the waters inside the southern california bight Monday night through Wednesday morning.


7 Day Forecast for Marine Location Near Casmalia, CA
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location: 34.7, -121.3     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 180028 AFDLOX

Area Forecast Discussion . UPDATED National Weather Service Los Angeles/Oxnard CA 428 PM PST Sun Jan 17 2021

SYNOPSIS. 17/1021 AM.

Gusty offshore winds and above normal temperatures continue today. Much cooler weather begins on Monday with a slight chance of rain and snow showers across the Los Angeles County mountains Monday night and Tuesday. Very strong winds return late Monday night into Wednesday, especially across Los Angeles and Ventura Counties.

SHORT TERM (TDY-WED). 17/156 PM.

Overall, 12Z models in surprisingly good synoptic agreement in the short term for a rather complex pattern. At upper levels, weak cutoff low will develop off the Central CA coast tonight and shift due south through Monday before being devoured by a low developing over the Great Basin Monday night/Tuesday then this low will continue to drift southwest, moving off the Baja coast Tuesday night and Wednesday. Near the surface, moderate to strong offshore flow will develop as a low develops southwest of the area.

Forecast-wise, main issue continues to be the potential for a widespread and DAMAGING wind event. Currently, Santa Ana winds are beginning to diminish this afternoon. This trend is expected to continue through this evening, so will let all WIND ADVISORIES expire with the afternoon forecast. After a relative lull tonight and Monday morning, the next significant Santa Ana wind event will begin to develop Monday afternoon/evening. During this time period, expect northeast winds to increase to advisory levels across the usual spots of Ventura/LA counties. By Monday night and continuing through Wednesday morning, the Santa Ana winds will continue to increase dramatically. 12Z models indicate LAX-DAG gradients peaking between -7.0 and -7.5 mb Tuesday morning with slight weakening through Wednesday. The most concerning part with the Monday night through Wednesday time frame is the amount of upper level wind/thermal support. Models forecast 850/950 mb winds between 45 and 55 knots with excellent cold air advection. So, widespread and DAMAGING northeast winds are likely Monday night through Wednesday morning (gusts anywhere between 50 and 80 MPH) across Ventura/LA counties as well as the mountains of San Luis Obispo and Santa Barbara counties. Will continue with HIGH WIND WATCHES for all of Ventura county and most of LA county. Additionally, will have a HIGH WIND WATCH for the mountains of San Luis Obispo and Santa Barbara counties. Given this pattern, advisory level northeasterly winds will be possible across the Central Coast.

Otherwise, second, much more minor issue, will be the potential for some wrap-around precipitation Tuesday and Tuesday night as the upper low drops southwest. At this time, precipitation chances look very slim, with likely any light showers confined to the San Gabriel Mountains and maybe the far southern coastal waters. Any shower activity that develops over the San Gabriel Mountains will likely fall as snow.

As for temperatures, will expect some slight cooling all areas on Monday. On Tuesday, there will be significant cooling due to cold air advection effects of the Santa Ana winds. On Wednesday, temperatures will rebound with less cold air advection and continued offshore winds.

LONG TERM (THU-SUN). 17/156 PM.

Overall, 12Z models continue to exhibit decent synoptic agreement through the extended period. At upper levels, weak ridge will develop over the area on Thursday with a low dropping across the area Friday through the weekend. Near the surface, weak offshore flow will continue on Thursday with weak onshore flow Friday through the weekend.

Forecast-wise, Thursday looks to be rather benign with some weak northeasterly winds and slightly cooler temperatures. For Friday through Sunday, look for noticeable cooling with all areas a few degrees below seasonal normals. With the upper low dropping across the area, skies will be partly to mostly cloudy with even the potential return of some coastal stratus. As for precipitation chances, there is the potential for some precipitation Friday and Saturday. At this time, do not anticipate any significant precipitation with most areas likely to receive less than 0.10 inches, if any precipitation at all. The only exception to this could be the San Gabriel Mountains where some local amounts around 0.25 would not be out of the question. Additionally, snow levels should be rather low, resulting in some potential light snow accumulations.

AVIATION. 18/0025Z.

At 2300Z at KLAX . There was no marine layer nor an inversion.

High confidence in CAVU TAFs.

KLAX . High confidence in CAVU TAF. There is a 10 percent chance of a 9 kt east wind component 13Z-19Z.

KBUR . High confidence in CAVU TAF. There is a 20 percent chance of 15KT easterly winds 15Z-21Z.

MARINE. 17/256 PM.

Across the Outer Waters . Small Craft Advisory (SCA) level hazardous seas will move through the waters through Tuesday and mariners should use extra caution crossing the Morro Bay Harbor entrance. The wind will increase to SCA level tonight and will remain elevated through Friday across much of the outer waters. There is a sixty percent chance of gale winds on Tuesday.

For the Inner Waters North of Point Sal . SCA level hazardous seas will move through the waters through Tuesday. The wind will increase to SCA level on Tuesday. Conditions will remain below SCA level Wednesday and Thursday then winds increase to SCA level again on Friday.

For the Inner Waters South of Point Conception . Northeast wind gusts to SCA level will occur across all of the waters Monday night through Wednesday and again on Friday. These conditions will bring strong winds and steep seas to east-facing harbor entrances across the Channel Islands including Avalon Harbor on Catalina Island. Hazardous seas may reach 10 feet across the western portion of the inner Santa Barbara Channel on Monday.

BEACHES. 17/216 PM.

A long period west to northwest swell will move through the coastal waters through Tuesday, resulting in high surf and dangerous rip currents on all west and northwest facing beaches.

For the Central Coast . Large breaking waves of 12 to 16 feet will continue through midday today, diminish somewhat overnight, then a larger swell will bring a secondary peak on Monday. Breaking waves of 15 to 20 feet are likely on Monday with local sets potentially greater than 20 feet.

For the Los Angeles and Ventura County beaches and exposed west facing beaches across the Santa Barbara South Coast . Large breaking waves of 4 to 8 feet will continue today with local sets to 10 feet across Ventura County beaches. Another large swell on Monday and Tuesday will bring surf of 5 to 10 feet with local sets to 12 feet across Ventura County beaches.

FIRE WEATHER. 17/405 PM.

Lingering offshore winds gusting between 25 and 40 mph combined with very warm temperatures and low humidities between 8 and 15 percent will continue to bring elevated to brief critical fire weather conditions to portions of Los Angeles and Ventura counties today. Offshore winds are expected to diminish tonight into Monday morning, then increase again across Los Angeles and Ventura counties by Monday afternoon, with humidities generally in the 15 to 25 percent range.

A very strong and damaging north to northeast wind event is likely between late Monday night and Wednesday morning. The strongest and most widespread winds are expected to be Tuesday mid morning through Tuesday night when widespread damaging wind gusts of 60 to 80 mph will be likely in the mountains, foothills, and some valley locations in Los Angeles and Ventura counties. Even coastal areas (including portions of the LA Basin) will likely see locally damaging wind gusts of 50 to 60 mph. Portions of San Luis Obispo and Santa Barbara counties (especially the mountains and Central Coast) could see strong northeast to east winds with this event Tuesday into Tuesday night, with wind gusts of 30 to 50 mph, except locally 60 mph across the higher terrain. Due to the uncertainty with the track of the upper low and the possibility of some moisture entrainment on Tuesday, confidence remains low with the humidity forecast. However there is the potential for humidity levels between 15 and 30 percent for a portion of this strong wind event, with the driest air focused across coastal and valley areas where downslope drying will be maximized. Due to the strength of this upcoming wind event and current state of the very dry fuels, a Fire Weather Watch will be considered for Tuesday with the afternoon forecast. Significant wind impacts will be likely with this event, including the threat of widespread downed trees and powerlines, as well as power outages. Winds are then expected to diminish Thursday through next weekend, with a chance of precipitation Friday through Sunday.

LOX WATCHES/WARNINGS/ADVISORIES. CA . High Surf Advisory in effect until 10 PM PST Tuesday for zones 34-35-39>41-87. (See LAXCFWLOX). High Wind Watch in effect from Monday evening through late Tuesday night for zones 40-41-44>46-53-54-88-547. (See LAXNPWLOX). High Wind Watch in effect from late Monday night through late Tuesday night for zones 51-52. (See LAXNPWLOX). Fire Weather Watch in effect from Monday evening through Wednesday morning for zones 234>236-251-252. (See LAXRFWLOX). Fire Weather Watch in effect from late Monday night through Tuesday evening for zones 240-241-244>246-253-254-288-547-548. (See LAXRFWLOX). PZ . Small Craft Advisory in effect until 3 AM PST Tuesday for zones 645-670-673-676. (See LAXMWWLOX). Gale Watch in effect from late Monday night through Wednesday morning for zones 650-655-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (WED-SUN).

Strong to potentially damaging Santa Ana winds are possible into early Wednesday.



PUBLIC . Thompson AVIATION . ASR MARINE . Kj BEACHES . Kj FIRE . Gomberg SYNOPSIS . Kj

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46259 11 mi37 min 56°F8 ft
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 23 mi23 min NW 3.9 G 7.8 57°F1014.5 hPa
46218 - Harvest, CA (071) 32 mi37 min 58°F9 ft
HRVC1 36 mi45 min 65°F 1014.4 hPa
PTGC1 - Point Arguello, CA 36 mi33 min N 8.9 G 8.9 62°F 1014.5 hPa (-1.2)
46215 - Diablo Canyon, CA (076) 42 mi37 min 56°F7 ft
PSLC1 - 9412110 - Port San Luis, CA 43 mi45 min Calm G 1.9 71°F 55°F1014.9 hPa
CPXC1 44 mi25 min 2.9 G 4.1

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
Lompoc, Vandenberg Air Force Base, CA39 mi35 minNW 410.00 miFair76°F37°F25%1014.7 hPa

Link to 5 minute data for KVBG

Wind History from VBG (wind in knots)
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Last 24hrN10N9NE4N8NE7NE12CalmCalmS3SE7SE8E4SE6SE5--SE6E4CalmCalmW4W5NW6NW6NW4
1 day agoN3SE5CalmSE5CalmNE10NE16NE11NE13NE9NE15NE14NE12NE13NE15NE15NE19NE18NE21NE22N16NE19
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2 days agoN10CalmSE5CalmSE5SE7SE9SE9SE11SE9SE10SE8SE12SE8SE11E7SE4NE4SE3NE5NW6N9N11N12

Tide / Current Tables for Avila, California
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Avila
Click for Map
Sun -- 01:25 AM PST     1.26 feet High Tide
Sun -- 06:08 AM PST     -0.02 feet Low Tide
Sun -- 07:10 AM PST     Sunrise
Sun -- 10:18 AM PST     Moonrise
Sun -- 11:40 AM PST     1.99 feet High Tide
Sun -- 05:16 PM PST     Sunset
Sun -- 07:05 PM PST     -2.71 feet Low Tide
Sun -- 10:03 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.21.20.90.50.1-00.10.411.51.921.710.1-0.9-1.8-2.5-2.7-2.5-2-1.1-0.2

Tide / Current Tables for Port San Luis Wharf, California
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Port San Luis Wharf
Click for Map
Sun -- 01:22 AM PST     4.03 feet High Tide
Sun -- 06:29 AM PST     2.27 feet Low Tide
Sun -- 07:10 AM PST     Sunrise
Sun -- 10:18 AM PST     Moonrise
Sun -- 12:14 PM PST     4.75 feet High Tide
Sun -- 05:16 PM PST     Sunset
Sun -- 07:19 PM PST     0.23 feet Low Tide
Sun -- 10:03 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.6443.63.12.62.32.32.63.23.94.54.74.64.13.32.31.30.60.30.30.81.62.5

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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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.