Wednesday, December11, 2019
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Marine Weather and Tides
Davenport, 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 7:09AMSunset 4:53PM Wednesday December 11, 2019 8:43 AM PST (16:43 UTC) Moonrise 4:46PMMoonset 6:33AM Illumination 100% Phase: Full Moon; Moon at 15 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 846 Pm Pst Tue Dec 10 2019
Tonight..SE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 15 seconds and S around 2 ft at 15 seconds. A chance of rain this evening, then a chance of showers after midnight.
Wed..SE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 15 seconds and S around 2 ft at 15 seconds. A slight chance of showers.
Wed night..SE winds up to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft at 15 seconds.
Thu..SE winds up to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft at 20 seconds.
Thu night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft at 18 seconds. A slight chance of rain.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 12 to 14 ft at 17 seconds.
Fri night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft at 17 seconds.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 8 to 10 ft.
Sun..N winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 7 to 9 ft.
PZZ500 846 Pm Pst Tue Dec 10 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak frontal system will bring light to moderate rain to the northern waters tonight. Light to moderate southerly winds will then continue through much of the week as a series of frontal systems pass north of the area. Winds shifting to the northwest towards the weekend. A moderate northwest swell will persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Davenport, CA
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location: 37.01, -122.2     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 111633 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 833 AM PST Wed Dec 11 2019

SYNOPSIS. Periods of light rain will be possible over mainly the northern portion of the forecast area through Saturday with mild temperatures region-wide. Conditions will dry out and turn cooler Sunday into Monday. Unsettled conditions will potentially return by mid/late next week.

DISCUSSION. as of 08:33 AM PST Wednesday . A moist zonal flow has developed in the wake of yesterday's trough. Light showers and/or drizzle continue over the Bay Area this morning. Rainfall rates are very light with only around one or two hundredths per hour. The forecast for today calls for scattered showers to decrease this afternoon across the SF Bay Area but persist across the North Bay. Tonight, a weak system moving through the flow will be accompanied by warm advection and produce additional precipitation. Steadier rain will begin across the North Bay this evening and spread south of the Golden Gate overnight. Rainfall will once again be light with this system with no major impacts. Moisture will continue to stream into northern California on Thursday and Friday with additional chances of precipitation.

Highs today will be near to slightly above normal, generally in the low 60s. Highs on Thursday and Friday will be several degrees warmer across the southern portion of the forecast area, where precipitation is less likely and clouds not as thick. Overnight lows through the end of the week will remain mild. The current forecast remains on track and no updates planned this morning. For additional details on the extended forecast, see the previous discussion.

PREV DISCUSSION. as of 02:53 AM PST Wednesday . Light rain and/or sprinkles continue over portions of the region this morning as an upper level trough exits to the east. Rainfall amounts have generally only been a few hundredths of an inch during the past 3 hours or so with the most widespread rainfall occuring over the North Bay. As a moist zonal flow is forecast to persist through late week, periods of light rain will be possible over the northern half of the region while lesser chances are expected south of the Golden Gate. Mostly cloudy conditions will also continue through late week resulting in mild overnight temperatures in the upper 40s to lower 50s with temperatures generally only warming into the lower 60s each afternoon. Overall, rainfall through late week will be minimal with no major impacts likely.

A short-wave trough is then forecast to drop into northern California late Friday into Saturday. While precipitation with this system will also be minimal given the lack of stronger mid/upper level support, rain chances will shift southward into the Central Coast along a weak frontal boundary. Conditions will then dry out late Saturday into Sunday when the zonal flow and deeper moisture advection gets shunted to the south. Temperatures will also turn cooler, only warming into the 50s for most urban areas Saturday and into Monday. Overnight conditions will also turn cooler given clearing sky conditions and colder air mass aloft, generally dropping into the 30s and 40s for most.

While forecast confidence remains low at this time, the ensembles do indicate the potential for another system to bring rain to the region during the middle part of next week. Overall, widespread heavy rainfall does not appear likely at this time, yet unsettled weather conditions will be possible during the extended forecast period.

AVIATION. as of 3:30 AM PST Wednesday . Low level moisture will linger through the day as a series of shortwave disturbances move through northern California. MVFR cigs will be predominant through most of the day Wednesday through there may be some afternoon clearing. Winds will be light and generally out of the southeast. Light rain has pretty much ended but may pick up again tonight after 06Z associated with the next disturbance.

Vicinity of KSFO . MVFR cigs bases 2500-3500 ft. Light east to southeast winds under 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Low level moisture will keep the threat for MVFR cigs through this morning. Some afternoon clearing is expected after 20Z. Generally southeast winds under 10 kt.

MARINE. as of 02:09 AM PST Wednesday . Weak high pressure off the California coast extends across California into the Great Basin. Winds will be light southeast through Thursday night before switching to northwest. Large northwest swells with long periods will build on Thursday and continue through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. NONE.



PUBLIC FORECAST: ST/RGass AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46042 - MONTEREY - 27NM West of Monterey Bay, CA 19 mi43 min ESE 14 G 16 55°F 57°F1023.4 hPa54°F
46092 - MBM1 20 mi96 min E 7.8 55°F 56°F1023.1 hPa (-0.0)
46114 - West Monterey Bay, CA 21 mi43 min 57°F6 ft
MLSC1 - Moss Landing, South Harbor, CA 26 mi154 min Calm G 0 53°F 1024.4 hPa51°F
ELXC1 - Elkhorn Slough Reserve, CA 28 mi178 min Calm 52°F 1024 hPa52°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 31 mi43 min 57°F2 ft
MEYC1 32 mi67 min 58°F1024 hPa
RTYC1 - 9414523 - Redwood City, CA 34 mi55 min SSE 1 G 1.9 54°F 57°F1023.6 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi43 min SE 19 G 25 55°F 57°F1022.5 hPa54°F
46239 - Point Sur, CA (157) 46 mi43 min 57°F5 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA22 mi50 minN 310.00 miOvercast53°F50°F89%1024.2 hPa

Link to 5 minute data for KWVI

Wind History from WVI (wind in knots)
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Last 24hrCalmE4SE5E7Calm3SW4SW4CalmW5W4CalmCalmE3E4N3NW4NW3CalmNW4N3NW3CalmN3
1 day agoCalmNE3SW3CalmCalm3CalmW5W5CalmNW3CalmN3NW3CalmCalmCalmCalmNW4NW3CalmCalmCalmNW3
2 days agoCalmCalmS3W7SW7--W4SW4SW3SE4CalmCalmS3CalmCalmCalmN4NW3CalmN4CalmNW4N4Calm

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Santa Cruz
Click for Map
Wed -- 03:01 AM PST     2.62 feet Low Tide
Wed -- 06:33 AM PST     Moonset
Wed -- 07:10 AM PST     Sunrise
Wed -- 08:55 AM PST     5.72 feet High Tide
Wed -- 04:01 PM PST     -0.72 feet Low Tide
Wed -- 04:45 PM PST     Moonrise
Wed -- 04:51 PM PST     Sunset
Wed -- 09:14 PM PST     Full Moon
Wed -- 10:59 PM PST     4.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.63.12.82.62.83.44.14.95.55.75.44.53.21.80.4-0.4-0.7-0.50.21.22.23.23.84.1

Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Wed -- 02:55 AM PST     2.52 feet Low Tide
Wed -- 06:34 AM PST     Moonset
Wed -- 07:12 AM PST     Sunrise
Wed -- 08:46 AM PST     5.62 feet High Tide
Wed -- 03:55 PM PST     -0.82 feet Low Tide
Wed -- 04:46 PM PST     Moonrise
Wed -- 04:52 PM PST     Sunset
Wed -- 09:14 PM PST     Full Moon
Wed -- 10:50 PM PST     3.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.432.62.52.83.44.14.95.55.65.24.32.91.50.2-0.6-0.8-0.50.21.22.23.23.84

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 San Francisco/Monterey Bay Area, CA (11,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, 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.