Monday, January20, 2020
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Marine Weather and Tides
Cambrian Park, 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 7:17AMSunset 5:20PM Monday January 20, 2020 9:14 AM PST (17:14 UTC) Moonrise 3:35AMMoonset 1:50PM Illumination 21% Phase: Waning Crescent; Moon at 25 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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PZZ535 Monterey Bay- 828 Am Pst Mon Jan 20 2020
Today..SW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 16 seconds.
Tonight..S winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft at 19 seconds.
Tue..S winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 6 to 8 ft at 16 seconds. Rain likely.
Tue night..SE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft at 16 seconds. A chance of rain.
Wed..SW winds up to 10 kt. Wind waves 1 ft. W swell 7 to 9 ft at 15 seconds.
Wed night..NW winds around 5 kt. Wind waves 1 ft. W swell 6 to 8 ft at 13 seconds.
Thu..N winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft and W up to 2 ft.
Fri..N winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft and nw 2 to 4 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 828 Am Pst Mon Jan 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds become southerly today ahead of an approaching frontal system and will increase by this evening before the system moves through the waters on Tuesday. Moderate northwest swell will persist with a longer period northwest swell arriving this afternoon and wave heights build through midweek. This will generate hazardous seas conditions for smaller vessels. Another long period northwest swell will then arrive late week.


7 Day Forecast for Marine Location Near Cambrian Park, CA
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location: 37.22, -121.88     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 201649 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 849 AM PST Mon Jan 20 2020

SYNOPSIS. Mostly cloudy and seasonably cool conditions will persist over the region today. There is a slight chance of sprinkles or isolated light rain, but most areas should remain dry. Rain chances increase region-wide late tonight into Tuesday as a weak frontal system moves across northern California. Mostly dry conditions are then expected for the remainder of the week, with rain likely returning next weekend.

DISCUSSION. as of 08:49 AM PST Monday . Widespread mid-high level clouds blanket the Bay Area this morning. Enough moisture is present in these clouds to show up on KMUX radar imagery. In fact, the radar imagery looks pretty ominous with echoes showing up over the coastal waters and the North Bay. Further investigation indicates much of the radar echoes are not likely hitting the ground. Automated gauges have not shown any bucket tips as of late. Cazadero Profiler also indicated echoes have been mostly elevated. The widespread virga makes sense when one looks at the morning Oakland sounding - very dry in the middle levels. All of that being said, if enough saturation occurs then a few isolated sprinkles may happen. Otherwise, cool and generally cloudy today with highs in the 50s.

No updated is need this morning.

PREV DISCUSSION. As of 2:30 AM PST Monday . There are no significant weather concerns in the short term. Widespread high clouds continue to stream off the Pacific and across California. These clouds are helping to limit fog formation overnight, and only patchy light fog is currently being observed in the North and East Bay Valleys. Deeper moisture and a weak upper level disturbance well to our southwest are forecast to move inland to the south of our area today. Radar currently shows weak returns offshore, but only at elevations of 12000 feet and above. Thus, we may see some virga or a few sprinkles today, but measurable precipitation is highly unlikely. Cloud cover will keep temperatures on the cool side of normal today, especially across the North and East Bay. Temperatures in these areas have been cooler than the NBM and most other model guidance over the past few days and will likely be so again today. Therefore, North and East Bay temps were adjusted below NBM values today.

Satellite currently shows a weather system offshore from the Pacific Northwest and northern California, along 135W. This system is forecast to track east today and tonight and begin spreading light rain into the North Bay tonight as warm advection develops. Rain will increase in the North Bay, and also begin spreading south and east of the Golden Gate, on Tuesday morning as the cold front approaches. Because the upper trough is forecast to track almost due east with very little southward movement, rain rates and amounts are expected to decrease quite a bit as the surface front moves south and east of San Francisco on Tuesday afternoon and evening. Showers may linger over the southern portion of our area through Tuesday night, but dry weather should return to all areas by Wednesday. Rainfall totals with the Tuesday system are currently forecast to range from a quarter to a half inch in the North Bay, except locally up to an inch in northwest Sonoma County. Elsewhere, rain totals are expected to be a quarter inch or less, except perhaps up to a half inch in the Santa Cruz Mountains. This system will not be cold like recent systems that came in from the northwest and snow levels are forecast to remain mostly above 6000 feet when precipitation is falling. Winds are not expected to have a significant impact with this system, although southerly wind gusts up to 30 mph are possible near the coast and locally in the hills on Tuesday.

Generally dry conditions are forecast for the remainder of the work week as the storm track remains to our north, but the Northern fringes of our area may see light rain at times. A relatively mild airmass will persist over our area and temperatures are forecast to be slightly warmer than normal in most areas during the second half of the week.

The longer range models are coming into better agreement for next weekend, and it looks increasingly likely that widespread rain will occur, with highest rain chances late Saturday night into Sunday. Based on the latest deterministic models, as well as the ensemble means, the weekend system looks somewhat stronger and wetter than the Tuesday system, but probably not strong/wet enough to produce significant weather impacts.

AVIATION. as of 03:31 AM PST Monday . For 12z TAFs. Satellite imagery shows thick cloud cover over the region at between 15,000 and 20,000 ft AGL. Cloud cover obscuring any view of lower clouds or possible fog in the Central Valley, but obs still show reduced visibility over portions of the East Bay with KLVK currently at 4 miles visibility along with KSTS. VFR conditions to prevail for most sites with MVFR and possibly IFR conditions in the North and East Bay this morning due to reduced visibility. High clouds to continue before lowering overnight ahead of a cold front. MVFR/IFR cigs expected to develop in the North Bay at the end of the taf period along with showers before reaching the Bay Area mid morning. Light SE winds this morning for most sites with SW to W winds this afternoon. Southerly winds to then return by the evening.

Vicinity of KSFO . VFR with continued high clouds and light SE to SW winds. Cigs expected to lower overnight ahead of the cold front with southerly winds increasing tomorrow morning as showers arrive.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Light E/SE winds this morning with locally higher winds possible in the Salinas Valley. Winds to turn onshore this afternoon before southerly winds return this evening.

MARINE. As of 2:05 AM PST Monday . Winds will continue to shift southerly into this morning ahead of an approaching frontal system. Southerly winds will then increase across the waters by this evening before the system moves through the waters on Tuesday. Moderate northwest swell will persist most of today before a longer period northwest swell arrives this afternoon and wave heights build through mid week. This will generate hazardous seas conditions for smaller vessels. A second long period northwest swell will then arrive late week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm from 3 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm from 3 PM SCA . Pt Arena to Pigeon Pt 10-60 nm from 3 PM



PUBLIC FORECAST: MM/Dykema AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 27 mi56 min Calm G 1.9 52°F1017.6 hPa
MLSC1 - Moss Landing, South Harbor, CA 29 mi35 min E 1 G 4.1 47°F 1018.1 hPa42°F
ELXC1 - Elkhorn Slough Reserve, CA 29 mi89 min Calm 47°F 1021 hPa43°F
46092 - MBM1 33 mi57 min ESE 7.8 52°F 54°F1016.7 hPa (+1.3)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi34 min SSE 5.8 G 9.7 55°F 54°F1017.4 hPa52°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 41 mi44 min 54°F5 ft
46114 - West Monterey Bay, CA 42 mi44 min 55°F8 ft
MEYC1 42 mi98 min 55°F1017.2 hPa
AAMC1 - 9414750 - Alameda, CA 44 mi56 min 52°F
LNDC1 45 mi56 min NW 2.9 G 2.9 1016.7 hPa
OBXC1 47 mi62 min 50°F 47°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi56 min N 4.1 G 6 1016.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi62 min N 1.9 G 2.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 48 mi56 min W 4.1 G 6 49°F 1015.9 hPa
PXSC1 49 mi56 min 50°F 45°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose / Reid / Hillv, CA9 mi82 minN 010.00 miOvercast45°F42°F93%1017.6 hPa
San Jose, San Jose International Airport, CA11 mi21 minVar 39.00 miOvercast47°F42°F83%1018.1 hPa
Watsonville, Watsonville Municipal Airport, CA20 mi21 minN 010.00 miMostly Cloudy49°F42°F77%1018 hPa
Palo Alto Airport, CA22 mi27 minVar 310.00 miMostly Cloudy46°F42°F87%1018.3 hPa

Link to 5 minute data for KRHV

Wind History from RHV (wind in knots)
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Last 24hrCalmCalmCalmN4CalmCalmNW4W7CalmCalmCalmCalmCalm----------------W6CalmCalm
1 day agoCalmCalmCalmCalmCalmCalmW4W4W433CalmCalm----------------CalmCalmCalm
2 days agoCalm--CalmCalmCalmCalmCalm--CalmNW4CalmCalmCalm------------------CalmCalm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Mon -- 03:29 AM PST     2.66 feet Low Tide
Mon -- 03:35 AM PST     Moonrise
Mon -- 07:19 AM PST     Sunrise
Mon -- 08:43 AM PST     10.76 feet High Tide
Mon -- 01:50 PM PST     Moonset
Mon -- 05:03 PM PST     -0.28 feet Low Tide
Mon -- 05:18 PM PST     Sunset
Mon -- 10:50 PM PST     7.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.54.33.32.72.84.16.28.510.310.710.28.974.82.81.10.1-0.30.21.63.65.677.5

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Mon -- 01:18 AM PST     -0.60 knots Max Ebb
Mon -- 03:20 AM PST     0.00 knots Slack
Mon -- 03:35 AM PST     Moonrise
Mon -- 06:01 AM PST     1.10 knots Max Flood
Mon -- 07:19 AM PST     Sunrise
Mon -- 08:53 AM PST     -0.00 knots Slack
Mon -- 01:42 PM PST     -1.37 knots Max Ebb
Mon -- 01:50 PM PST     Moonset
Mon -- 04:33 PM PST     0.00 knots Slack
Mon -- 05:18 PM PST     Sunset
Mon -- 07:27 PM PST     1.42 knots Max Flood
Mon -- 10:35 PM PST     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-0.6-0.5-0.20.40.91.110.6-0-0.5-0.9-1.2-1.3-1.4-1.1-0.50.41.11.41.410.4-0.1

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 (12,3,4,5)
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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 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.