Saturday, July4, 2020
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Marine Weather and Tides
Santa Venetia, 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 8:37PM Saturday July 4, 2020 5:34 AM PDT (12:34 UTC) Moonrise 7:35PMMoonset 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 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..SW winds 5 to 10 kt, increasing to 10 to 20 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun night..W winds 15 to 25 kt with gusts up to 30 kt.
Mon..SW winds 10 to 20 kt with gusts up to 25 kt.
Mon night..W winds 10 to 20 kt with gusts up to 30 kt.
Tue..W winds 10 to 20 kt with gusts up to 25 kt.
Wed..SW winds 5 to 15 kt.
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 Santa Venetia, CA
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location: 38.02, -122.5     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 041127 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 427 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 04:27 AM PDT Saturday . For 12Z TAFs. A compressed marine layer remains in place at around 1,000 ft AGL per the Fort Ord Profiler. Satellite imagery shows mainly clear skies aside from some low clouds around the Monterey Bay. VFR conditions through the period for most sites as drier air moves in from the northwest. IFR/LIFR conditions around the Monterey Bay with patchy fog before clearing mid to late morning. Light winds this morning increasing and turning onshore this afternoon around 10-15 kt with locally higher gusts.

Vicinity of KSFO . VFR conditions through the period with patches of low clouds possible this morning around the SF Bays. W/NW winds this morning around 10 kt increasing this afternoon to 15 to 20 kt with gusts to 25 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Satellite shows low clouds around the Monterey Bay and part way down the Salinas Valley. LIFR/IFR conditions with patchy fog this morning before VFR conditions prevail mid to late morning through the rest of the day. Low clouds may return tonight, though confidence is low.

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: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 8 mi46 min 64°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 9 mi36 min S 6 55°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi46 min SSW 8.9 G 12 58°F 1016.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 13 mi46 min WSW 8 G 12 59°F 1015.5 hPa
FTPC1 - 9414290 - San Francisco, CA 15 mi46 min 62°F
PXSC1 16 mi46 min 57°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 16 mi46 min WSW 1.9 G 2.9 56°F 1015.3 hPa
OBXC1 17 mi46 min 57°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 17 mi46 min WSW 5.1 G 6 57°F 1016.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi46 min WSW 8 G 8.9
46237 - San Francisco Bar, CA (142) 18 mi34 min 60°F5 ft
LNDC1 19 mi46 min WNW 1.9 G 2.9 58°F 1016.2 hPa
UPBC1 20 mi46 min NW 8.9 G 13
AAMC1 - 9414750 - Alameda, CA 20 mi46 min 69°F
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi46 min NW 9.9 G 12 59°F 68°F1015.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 25 mi46 min W 15 G 18 60°F 69°F1015 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi24 min WNW 7.8 G 9.7 55°F 55°F1017 hPa53°F
SFXC1 - San Francisco Bay Reserve, CA 28 mi49 min W 6
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi46 min NW 9.9 G 14 64°F 1014.5 hPa
RTYC1 - 9414523 - Redwood City, CA 39 mi46 min S 1.9 G 2.9 57°F 74°F1016.8 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi24 min NW 18 G 21 53°F 53°F1016.3 hPa51°F

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA9 mi59 minN 010.00 miFair48°F46°F94%1016.3 hPa
Petaluma Municipal Airport, CA17 mi39 minN 05.00 miFog/Mist46°F46°F100%1016.6 hPa
Napa, Napa County Airport, CA18 mi40 minN 02.50 miFog/Mist52°F48°F89%1015.2 hPa
Concord, Buchanan Field, CA24 mi41 minNW 510.00 miFair57°F51°F81%1014.2 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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1 day agoS4S4N45N5NE56NE8
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2 days agoCalmCalm4E43E5SE8E7E66CalmSW9SW8N7NE8NE5CalmCalmCalmCalmCalmCalmS3Calm

Tide / Current Tables for Gallinas Creek, San Pablo Bay, California
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Gallinas Creek
Click for Map
Sat -- 05:15 AM PDT     Moonset
Sat -- 05:52 AM PDT     Sunrise
Sat -- 07:12 AM PDT     -1.18 feet Low Tide
Sat -- 02:11 PM PDT     4.86 feet High Tide
Sat -- 06:51 PM PDT     2.45 feet Low Tide
Sat -- 08:35 PM PDT     Moonrise
Sat -- 08:36 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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6.96.55.53.92.10.4-0.7-1.2-1-0.20.92.23.44.44.94.743.22.62.52.83.74.85.8

Tide / Current Tables for Point San Pablo Midchannel, San Pablo Bay, California Current
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Point San Pablo Midchannel
Click for Map
Sat -- 01:14 AM PDT     -0.01 knots Slack
Sat -- 05:14 AM PDT     -3.27 knots Max Ebb
Sat -- 05:15 AM PDT     Moonset
Sat -- 05:52 AM PDT     Sunrise
Sat -- 09:16 AM PDT     0.01 knots Slack
Sat -- 12:30 PM PDT     1.81 knots Max Flood
Sat -- 03:36 PM PDT     -0.00 knots Slack
Sat -- 05:36 PM PDT     -1.04 knots Max Ebb
Sat -- 07:44 PM PDT     0.00 knots Slack
Sat -- 08:34 PM PDT     Moonrise
Sat -- 08:35 PM PDT     Sunset
Sat -- 09:44 PM PDT     Full Moon
Sat -- 10:45 PM PDT     2.15 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.3-1.1-2.3-3-3.3-3.2-2.6-1.6-0.30.71.41.81.81.30.5-0.3-0.9-1-0.60.21.222.1

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 (8,2,3,4)
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Ground Weather Radar Station Sacramento, 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.