Tuesday, December10, 2019
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Marine Weather and Tides
Mountain Gate, 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 7:20AMSunset 4:44PM Tuesday December 10, 2019 4:42 PM PST (00:42 UTC) Moonrise 3:57PMMoonset 5:39AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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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PZZ415 Expires:201909161915;;886895 Fzus76 Keka 161819 Mwseka Marine Weather Statement National Weather Service Eureka Ca 1119 Am Pdt Mon Sep 16 2019 Pzz410-415-450-470-161915- 1119 Am Pdt Mon Sep 16 2019
.isolated strong Thunderstorms over the coastal waters... The areas affected include... Coastal waters from point saint george to cape mendocino ca out 60 nm... At 1114 am, doppler radar indicated a few strong Thunderstorms, capable of producing wind gusts to around 30 knots, from 5 nm northwest of orick to 45 nm west of patrick's point. These storms are moving southeast at 10 knots. Precautionary/preparedness actions... Mariners can expect gusty winds to around 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms passes. && lat...lon 4174 12416 4145 12406 4123 12411 4114 12416 4105 12415 4106 12414 4102 12411 4070 12426 4071 12426 4058 12435 4083 12572 4096 12565 4178 12460 4178 12426
PZZ400 219 Pm Pst Tue Dec 10 2019
Synopsis for northern california waters..A frontal boundary brings moderate south winds and building seas today. A large, long period west-northwesterly swell is forecast to impact the waters on Thursday and Friday.


7 Day Forecast for Marine Location Near Mountain Gate, CA
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location: 40.77, -122.34     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 102302 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 302 PM PST Tue Dec 10 2019

SYNOPSIS. Rain returns to the region tonight tapering to a few light showers on Wednesday. Widespread precipitation expected later in the week and into the weekend. Drier weather Sunday and early next week.

DISCUSSION. After the morning fog in the Valley, much of the low cloud deck was slow to erode. Now the clouds associated and ahead of the frontal band along the coast are moving into our area and will spread over the Sierra early this evening. It has been a sunny, seasonably pleasant day in the Sierra as the higher elevations were above the fog and well to the east of the advancing cloud deck from the west for most of the day. But that will change this evening.

The frontal system will move into the region, spreading light rain over much of our CWA beginning late this afternoon and continuing into the evening. Radar echoes along the Nrn CA coast this morning are now moving onshore at press time, and the timing of the upper trof suggests the frontal precip should end by Wed morning as the trof moves through our region. Satellite trends suggest a brief period of clearing early Wed morning as the trof passes, followed by an increase in cloud cover during the day. Behind the trof, heights rebuild on Wed as a ridge axis slides across the region. Some light sprinkles or showers are still possible mainly in the Nrn part of our CWA on Wed, where WAA (about 7 deg C/12hr in the 850-700 mbs layer) could result in some light precip.

An increase in precip is forecast over Norcal Wed nite and Thu as a strong 150kt Pac jet south of the GOA (Gulf of AK) low reaches the coast and focuses a +3 PW anomaly into our CWA. The U.S. West Coast AR Tool shows that a "weak" AR (TPW/moisture plume) along 140W will make "landfall" during this time (late on 12/11 and into 12/12). Rising 5H heights will steer the storm track and main dynamics a little farther N and into the Pac NW. But the strong WAA Wed nite and Thu (over 5 deg C/12 hr in the 850-700 mbs layer) will interact with the moisture plume resulting in steady precip over Norcal, mainly over the Nrn mtns and areas N of I-80. An inch or so of precip is forecast over Shasta Co during this time, with amounts tapering off rapidly Swd to the I-80 corridor. South of I-80, only a few hundredths are expected as the storm track shifts Nwd.

Looks as if it will be a little wetter in our CWA on Fri from earlier forecasts as 5H heights begin to fall slowly as the GOA trof emerges from its source region. This will keep the TPW plume over our CWA through the day. Comparing our QPF with the ECMWF ensembles we are generally a little low/light on the QPF and we made a last minute upward adjustment this afternoon . but still we may be a little too light. The bulk of the precip is still forecast over the Sierra.

Snow levels will be rising Wed nite and Thu to 8Kft or so limiting winter travel impacts, until they lower below the passes Fri nite. JHM

EXTENDED DISCUSSION (Saturday THROUGH Tuesday).

By Saturday morning expect ongoing precipitation mainly over the mountains and foothills, although a few lingering showers may be possible in the Valley. Snow levels will range from 4-5kft Saturday, although snowfall accumulations themselves will only be a few inches. Some minor mountain travel impacts are anticipated Saturday due to this lingering precipitation. Models have trended a bit later to bring dry weather back to the area, as a few light lingering snow showers will be possible through Sunday morning.

Upper level ridging builds into the area Sunday and Monday. Mostly clear skies and average temperatures are expected early next week. Ensemble guidance shows the potential for another system to impact NorCal Tuesday, although confidence with this system remains low at this time.

AVIATION.

Deteriorating conditions expected as a system moves across northern California tonight. Light rain is expected at RDD/RBL between 04-06Z, spreading south towards Sacramento terminals shortly after. MVFR/IFR conditions likely overnight at these sites, with possible LIFR conditions returning to southernmost terminals.

STO WATCHES/WARNINGS/ADVISORIES. None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HBYC1 - 9418767 - North Spit, CA 99 mi67 min 53°F1019.5 hPa

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Redding Municipal Airport, CA18 mi50 minN 010.00 miMostly Cloudy52°F43°F72%1023.1 hPa

Link to 5 minute data for KRDD

Wind History from RDD (wind in knots)
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Last 24hrCalmCalmN4W3N4CalmNW3CalmCalmCalmW3E4W6CalmE5CalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmN3CalmNW5NW3CalmN3NE3NW5NW53CalmNE3NE3N3SE3CalmCalmCalmE4SE5SE7SE5
2 days ago6S18
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S18S9SW8S8SW6SW5SW4W4W3W4CalmSE4E3N3CalmCalmSW3

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Tue -- 04:45 AM PST     2.71 feet Low Tide
Tue -- 05:46 AM PST     Moonset
Tue -- 07:29 AM PST     Sunrise
Tue -- 10:47 AM PST     7.39 feet High Tide
Tue -- 04:04 PM PST     Moonrise
Tue -- 04:48 PM PST     Sunset
Tue -- 05:54 PM PST     -0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.34.94.23.42.92.73.24.15.36.47.27.46.95.84.32.51-0-0.30.11.22.53.94.9

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
Click for Map
Tue -- 04:03 AM PST     2.66 feet Low Tide
Tue -- 05:46 AM PST     Moonset
Tue -- 07:29 AM PST     Sunrise
Tue -- 10:31 AM PST     7.94 feet High Tide
Tue -- 04:04 PM PST     Moonrise
Tue -- 04:48 PM PST     Sunset
Tue -- 05:12 PM PST     -0.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.64.943.12.72.93.74.96.27.27.97.97.15.63.61.70.2-0.4-0.20.723.44.65.5

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 Sacramento, CA (19,4,5,8)
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Ground Weather Radar Station Beal 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 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.