Saturday, July4, 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 5:51AMSunset 8:33PM Saturday July 4, 2020 4:15 AM PDT (11:15 UTC) Moonrise 7:30PMMoonset 4:15AM 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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PZZ535 Monterey Bay- 206 Am Pdt Sat Jul 4 2020
.small craft advisory in effect from this afternoon through this evening...
.small craft advisory in effect from Sunday morning through Sunday evening...
Today..W winds up to 10 kt, increasing to 10 to 20 kt with gusts up to 25 kt this afternoon. Wind waves 1 ft, increasing to 2 to 3 ft this afternoon. W swell 3 to 5 ft at 9 seconds and sw 2 to 3 ft at 18 seconds.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 9 seconds and sw 2 to 3 ft at 17 seconds.
Sun..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 9 seconds and sw 2 to 3 ft at 16 seconds.
Sun night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 9 seconds and sw 2 to 3 ft at 16 seconds.
Mon..W winds 20 to 30 kt with gusts up to 35 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 9 seconds and sw 2 to 3 ft at 15 seconds.
Mon night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 8 seconds and sw around 2 ft at 15 seconds.
Tue..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 3 to 5 ft and S around 2 ft.
Wed..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft and S around 2 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 206 Am Pdt Sat Jul 4 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase across the coastal waters today and tonight as surface high pressure builds over the eastern pacific. Moderate to strong winds will then persist over the waters through the holiday weekend. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. A long-period southerly swell train will persist through the weekend. This will cause occasional breaking waves over nearshore shoals and strong currents along the coast, especially near points and headlands.


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 040947 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 247 AM PDT Sat Jul 4 2020

SYNOPSIS. High pressure builds Saturday and Sunday with a warming trend for inland areas as the marine layer mixes out. The ridge breaks down early next week as a dry trough passes through bringing a return of onshore winds and the marine layer.

DISCUSSION. as of 3:00 AM PDT Saturday . Happy fourth of July! Visible satellite imagery shows mostly clear skies under the bright Buck moon early this morning with little indication of a marine layer. A few patches of stratus exist directly over Half Moon Bay and throughout the Monterey Bay area early this morning with no additional stratus evident until Point Conception well to the south in Santa Barbara county. The marine layer was at roughly 1800 feet 24 hours ago but is now being suppressed both by subsidence aloft under a building ridge from the southeast and by the entrainment of dry air from turbulent mixing from brisk winds developing from the north. These northwest winds will be fairly breezy to occasionally gusty through the afternoon and evening periods along the immediate coast and through coastal gaps.

A 590dm 500mb high pressure ridge will continue to backbuild into California today and bring a general warming and drying trend to the area, particularly across the interior where temperatures will rebound to become slightly to somewhat above normal (+6-10) with afternoon highs in the mid 80s to mid 90s. Warm, dry air associated with this high pressure system has already advected into the region above the nocturnal inversion early this morning. As of 2am, weather stations at or above 1250 feet reported temperature generally 5 to 20 degrees higher than and humidity values 30-60% lower from the same time last night. This warmer, drier air will mix down to the surface during the day today and result in today being the warmest and driest of the next few days. Given that this is the fourth of July, these warm, dry conditions will elevated fire weather concerns due to an increase in outdoor activities, particularly from fireworks and cookouts. Please be mindful of these warm, dry conditions and dry fuels when planning your holiday weekend. In addition, the marine layer will be nonexistent today and tonight as it continues to be compressed and scoured out, resulting in mostly clear conditions for tonight.

Sunday will be similar to Saturday except slightly cooler with moderately stronger onshore winds. The same 564dm 500mb low pressure trough that was draped over the region this last Thursday will once again dig southward and take over the regional weather pattern through the day Monday as a series of vorticity pulses round the base of the trough and intensify the feature. As a result, the marine layer will rebound while a cooling, moistening trend will occur under an enhanced onshore flow regime. This pattern lingers through mid week with mostly seasonable conditions regionwide. By late next week, the Bay Area is once again positioned between low pressure to the north and a backbuilding ridge to the southeast. Medium to long term range models disagree slightly on the exact positioning of these features and that actually plays a significant role as a few few hundred mile difference would place the majority of the region under troughing or ridging. For now, the Euro favors the backbuilding ridge and 590dm heights while the GFS members favor a weaker ridge and 582dm heights.

AVIATION. As of 10:01 PM PDT Friday . For 06Z TAFs. The marine layer varies from 1,000 to 1,200 feet deep. Increasing lower to mid level ridging will compress the marine layer through the period keeping VFR going except for patchy VLIFR-IFR along the immediate coastline. Drier air transporting in from the northwest during the day Saturday will likely keep VFR going into the 4th of July evening.

Vicinity of KSFO . VFR, west wind near 10 knots tonight and Saturday morning. West wind increasing again to 25 knots Saturday afternoon and evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR except patchy IFR along the coast this evening, increasing VLIFR-IFR tonight and Saturday morning. VFR returning by late Saturday morning and afternoon. West winds 5 knots occasionally up to 10 knots tonight and Saturday morning. West to northwest winds 10 to 15 knots Saturday afternoon. Early to mid Saturday evening likely a similar scenario to this evening with VFR and patchy IFR.

MARINE. as of 2:06 AM PDT Saturday . Northwest winds will increase across the coastal waters today and tonight as surface high pressure builds over the eastern Pacific. Moderate to strong winds will then persist over the waters through the holiday weekend. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. A long-period southerly swell train will persist through the weekend. This will cause occasional breaking waves over nearshore shoals and strong currents along the coast, especially near points and headlands.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 9 AM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . SF Bay from 3 PM SCA . Mry Bay from 3 PM



PUBLIC FORECAST: DRP AVIATION: Canepa 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 mi45 min SW 1 G 2.9 59°F 75°F1016.9 hPa
MLSC1 - Moss Landing, South Harbor, CA 29 mi100 min SE 1.9 G 4.1 55°F 1017 hPa53°F
ELXC1 - Elkhorn Slough Reserve, CA 29 mi90 min Calm 51°F 51°F
46092 - MBM1 33 mi106 min NE 7.8 55°F 58°F1016.4 hPa (-0.6)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi35 min NNW 12 G 16 56°F 56°F1017 hPa53°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 41 mi49 min 58°F2 ft
MEYC1 42 mi39 min Calm G 4.1 54°F 61°F1016.8 hPa
46114 - West Monterey Bay, CA 44 mi49 min 56°F7 ft
AAMC1 - 9414750 - Alameda, CA 44 mi45 min Calm G 2.9 58°F 69°F1016.4 hPa
LNDC1 45 mi45 min W 2.9 G 4.1 57°F 1016.3 hPa
OBXC1 47 mi45 min 57°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi45 min WSW 5.1 G 7 57°F 1016.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi45 min SW 8 G 9.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 48 mi45 min SSW 1.9 G 2.9 56°F 1015.3 hPa
PXSC1 49 mi45 min 57°F 54°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA11 mi22 minS 410.00 miFair59°F52°F78%1016.3 hPa
Mountain View, Moffett Field, CA17 mi20 minN 010.00 mi59°F51°F77%1016.3 hPa
Watsonville, Watsonville Municipal Airport, CA20 mi22 minN 310.00 miFair49°F48°F97%1016.8 hPa

Link to 5 minute data for KRHV

Wind History from RHV (wind in knots)
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Last 24hr------------------Calm5Calm----NW4NW8NW10NW8NW11NW10W11NW7NW7NW7
1 day ago--------------------S16
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2 days ago----------------CalmCalmS10S9S11S8NW5SW45NW10NW10NW126S8S7SE8

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Sat -- 05:14 AM PDT     Moonset
Sat -- 05:52 AM PDT     Sunrise
Sat -- 08:09 AM PDT     -1.42 feet Low Tide
Sat -- 02:08 PM PDT     7.99 feet High Tide
Sat -- 07:48 PM PDT     2.95 feet Low Tide
Sat -- 08:30 PM PDT     Moonrise
Sat -- 08:32 PM PDT     Sunset
Sat -- 09:44 PM PDT     Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.310.89.57.552.50.4-0.9-1.4-0.90.62.85.27.187.76.75.34.13.234.16.38.8

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
Sat -- 12:14 AM PDT     -0.00 knots Slack
Sat -- 05:04 AM PDT     -1.66 knots Max Ebb
Sat -- 05:15 AM PDT     Moonset
Sat -- 05:52 AM PDT     Sunrise
Sat -- 07:51 AM PDT     0.00 knots Slack
Sat -- 10:44 AM PDT     1.76 knots Max Flood
Sat -- 02:04 PM PDT     -0.01 knots Slack
Sat -- 05:47 PM PDT     -0.70 knots Max Ebb
Sat -- 07:39 PM PDT     0.00 knots Slack
Sat -- 08:31 PM PDT     Moonrise
Sat -- 08:32 PM PDT     Sunset
Sat -- 09:44 PM PDT     Full Moon
Sat -- 10:12 PM PDT     1.21 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.4-0.9-1.3-1.6-1.7-1.4-0.80.11.11.61.71.50.90-0.3-0.6-0.7-0.7-0.40.20.91.21.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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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 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.