Friday, December6, 2019
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Marine Weather and Tides
Shelter Cove, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:24AMSunset 4:50PM Friday December 6, 2019 2:22 AM PST (10:22 UTC) Moonrise 2:10PMMoonset 1:43AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 844 Pm Pst Thu Dec 5 2019
.small craft advisory in effect through Friday evening...
Tonight..SE winds 20 to 30 kt. Waves S 10 ft at 10 seconds... And nw 5 ft at 15 seconds. Slight chance of rain.
Fri..SE winds 20 to 30 kt with gusts to around 40 kt. Waves S 14 ft at 10 seconds...and W 7 ft at 18 seconds. Rain.
Fri night..S winds 20 to 30 kt. Waves S 15 ft at 11 seconds... And N 3 ft at 14 seconds. Showers and slight chance of tstms.
Sat..S winds 15 to 25 kt. Waves S 14 ft at 10 seconds...and nw 3 ft at 14 seconds. Showers and slight chance of tstms.
Sat night..S winds 10 to 15 kt. Waves sw 11 ft at 9 seconds... And nw 3 ft at 13 seconds.
Sun..NW winds 5 kt. Waves sw 7 ft at 10 seconds...and nw 3 ft at 16 seconds.
Mon..S winds 5 to 10 kt. Waves sw 3 ft at 8 seconds...and nw 5 ft at 15 seconds.
Tue..S winds 5 to 10 kt. Waves S 3 ft at 5 seconds...and nw 5 ft at 14 seconds.
PZZ400 844 Pm Pst Thu Dec 5 2019
Synopsis for northern california waters..An approaching storm system will bring southerly gales across the outer waters this evening through Friday. Conditions are expected to improve on Sunday as south winds and seas subside through early next week.


7 Day Forecast for Marine Location Near Shelter Cove, CA
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location: 40.03, -124.07     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 052301 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 301 PM PST Thu Dec 5 2019

SYNOPSIS. An approaching front will bring periods of rain and gusty winds to northwest California beginning late tonight into Friday. Numerous showers, some with heavy downpours and gusty winds, will persist through Saturday evening. Drier weather will return by late Sunday and continue through at least Monday.

DISCUSSION. Forecast thinking is largely unchanged for the approaching storm system as transient high pressure and pleasant conditions this afternoon give way to increasing winds and rain later tonight into Friday. Winds will begin to pick up on the coastal ridges later this evening ahead of an approaching front as south-southwest flow develops aloft in advance of a deep upper level trough over the eastern Pacific. Model trends have been slightly slower with the arrival of the front, therefore the gustiest conditions and the onset of precipitation may be delayed by a few hours compared to previous forecast packages. Nonetheless, gusty ridgetop winds can be expected overnight into Friday morning, with the worst conditions confined to areas above 1500 feet. Breezy conditions can also be expected at the coast, although peak wind gusts will be much lower as the southerly component and a neutral temperature advection regime will not be conducive to mixing the strongest winds down to the surface. A second round of winds later Friday into Saturday will likely bring stronger gusts to the coast as the arrival of the upper trough ushers in a more unstable and convective airmass.

In terms of precipitation, the forecast remains generally on track with upslope flow ahead of the front initially generating spotty shower activity over the higher terrain of Trinity and Mendocino Counties this evening. Stratiform rain will then spread over the area from the west on Friday morning with the arrival of the front. Downsloping still looks to limit precipitation amounts in the Humboldt Bay area through Friday evening before the transition to a more showery regime with the arrival of the upper low Friday night into Saturday. Storm total rainfall amounts still look to be in the 2-4 inch range for most of the area, with locally higher amounts on the SW facing slopes. A few thunderstorms cannot be ruled out on Saturday over the coastal waters and along the coast as mid level lapse rates increase with the arrival of the trough, but these should remain isolated in nature. Small hail does not look to pose a major threat with this system as temperatures will not be cold enough aloft and snow levels will remain high throughout the event, generally above 6000 feet for most of the area. Local effects could bring the snow level down to around 5000 feet in the vicinity of the Trinity Horn on Saturday, with some minor accumulations possible at Scott Mountain Summit on Hwy 3. Otherwise, rain will be the dominant precipitation type across northwest California through the weekend.

Showers should taper off somewhat quickly by Sunday afternoon as the upper low departs to the east, with dry conditions prevailing across the area through at least Tuesday morning as upper level ridging builds overhead. The next system will approach during the middle of the week, but does not look to pose much of a threat in terms of winds or heavy precipitation at this time. /CB

AVIATION. An approaching storm system will bring increasing south winds through tonight with wind shear hazards expected at KCEC and KACV. In addition to winds, mid and upper level clouds will spread over northwest California with rain impacting the region early Friday morning. Expect MVFR to IFR conditions to impact airfields with the arrival of the rain, along with lower ceilings and visibility. Rainfall will prolong deteriorated conditions through Friday night. /KMZ

MARINE. The approaching storm system will cause southerly gales to develop across the outer waters this evening and persist into Friday. The start of the gale warnings were postponed until tonight around 9 PM, as models were indicating a delay in the onset of gale force winds. Winds across the inner waters will be lighter, with fresh southerlies forecast to develop tonight. However, gale force wind gusts will be possible nearshore especially around Point Arena and Cape Mendocino through Friday afternoon. Steep, wind-driven seas will build overnight and peak Friday morning around 10 to 15 feet in the northern waters and 15 to 20 feet in the southern waters. The marine environment will improve on Saturday and Sunday as south winds ease and the seas subsequently lie down. Next week will start off with lower winds and seas as high pressure temporarily moves over the region. Then, a building west-southwesterly swell will bring nearly 10 foot seas by mid week. /KMZ

EKA WATCHES/WARNINGS/ADVISORIES. CA . Wind Advisory from 10 PM this evening to noon PST Friday for CAZ102-104>106.

NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory from 7 PM this evening to 9 PM PST Friday for PZZ450.

Small Craft Advisory until 9 PM PST this evening for PZZ470-475.

Gale Warning from 9 PM this evening to 9 PM PST Friday for PZZ470-475.

Small Craft Advisory until 9 PM PST Friday for PZZ455.



Visit us at https://www.weather.gov/eureka

Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka

For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46213 - Cape Mendocino, CA (094) 40 mi22 min 54°F10 ft
HBYC1 - 9418767 - North Spit, CA 52 mi46 min 51°F1011.7 hPa

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fortuna Rohnerville Airport, CA36 mi47 minSE 15 G 1910.00 miMostly Cloudy59°F44°F59%1011.8 hPa

Link to 5 minute data for KFOT

Wind History from FOT (wind in knots)
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Last 24hrSE5CalmCalmSE4SE5E11E13SE11SE10SE16
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1 day agoSE7SE7SE8SE7SE5CalmS3CalmNW3NW4NW7NW7NW7CalmNW3CalmS3SE4SE5SE5N3CalmSE3E5
2 days agoE9S4S5S6SE6SE6S7SE6CalmCalmW3W9W9W9W7W7CalmCalmSE5S6SE7CalmCalmS7

Tide / Current Tables for Shelter Cove, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Shelter Cove
Click for Map
Fri -- 12:17 AM PST     1.41 feet Low Tide
Fri -- 01:43 AM PST     Moonset
Fri -- 06:55 AM PST     5.59 feet High Tide
Fri -- 07:23 AM PST     Sunrise
Fri -- 01:43 PM PST     1.66 feet Low Tide
Fri -- 02:10 PM PST     Moonrise
Fri -- 04:50 PM PST     Sunset
Fri -- 07:14 PM PST     4.20 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.52.12.93.94.85.45.65.44.73.932.21.81.722.63.33.94.24.13.73.12.4

Tide / Current Tables for Punta Gorda, California Current
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Punta Gorda
Click for Map
Fri -- 01:23 AM PST     0.00 knots Slack
Fri -- 01:44 AM PST     Moonset
Fri -- 04:29 AM PST     0.81 knots Max Flood
Fri -- 07:25 AM PST     Sunrise
Fri -- 07:32 AM PST     -0.00 knots Slack
Fri -- 10:22 AM PST     -0.87 knots Max Ebb
Fri -- 02:11 PM PST     Moonrise
Fri -- 02:22 PM PST     0.00 knots Slack
Fri -- 04:51 PM PST     Sunset
Fri -- 05:09 PM PST     0.65 knots Max Flood
Fri -- 07:55 PM PST     -0.00 knots Slack
Fri -- 10:28 PM PST     -0.73 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.20.20.60.80.80.60.3-0.2-0.7-0.9-0.8-0.7-0.5-0.20.30.50.60.60.4-0-0.5-0.7-0.7

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    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 Eureka, CA (5,6,7,8)
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Ground Weather Radar Station Eureka, 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 numerious 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.