Friday, July3, 2020
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Marine Weather and Tides
Mountain House, 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 5:47AMSunset 8:32PM Friday July 3, 2020 7:46 PM PDT (02:46 UTC) Moonrise 6:29PMMoonset 3:20AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 848 Am Pdt Fri Jul 3 2020
.small craft advisory in effect from 2 pm pdt this afternoon through this evening...
Today..SW winds 5 to 15 kt, increasing to 15 to 25 kt with gusts up to 30 kt this afternoon.
Tonight..SW winds 15 to 25 kt with gusts up to 30 kt.
Independence day..SW winds 5 to 15 kt.
Sat night..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..SW winds 5 to 15 kt.
Sun night..W winds 5 to 15 kt.
Mon..W winds 10 to 20 kt with gusts up to 25 kt.
Tue..W winds 10 to 20 kt with gusts up to 25 kt.
PZZ500 848 Am Pdt Fri Jul 3 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds are forecast to prevail over the coastal waters today. Winds will increase this evening and tomorrow as surface high pressure builds over the eastern pacific. Moderate to strong winds are expected over the weekend. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. A long-period southerly swell train will arrive today and 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 Mountain House, CA
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location: 37.83, -121.57     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 040008 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 508 PM PDT Fri Jul 3 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. Long range showing a strong ridge over much of the West heading into next weekend.

DISCUSSION. as of 1:00 PM PDT Friday . California is currently positioned between a weak 560dm 500mb trough centered over SW Canada to the north and a 591dm 500mb high pressure ridge over the four corners to the southeast. West to southwest flow is prevailing aloft between these features while seasonable, fair weather conditions are prevailing at the surface early this afternoon. Visible satellite imagery depicts the marine layer draped along the coast from Fort Ross in northern Sonoma southward through Point Conception in Santa Barbara. Coastal profilers indicate the marine layer depth is thinning as warm, dry air advects in aloft from the southeast and subsides into the marine layer from above. This is compressing the marine layer gradually from the south while dry northerly winds are scouring out the moisture from the north, and as such, both the high pressure and low pressure systems flanking California this afternoon are acting against the marine layer. Consequently, the marine layer is forecast to contract and compress tonight and tomorrow night. For tonight, there will likely be enough remnant of the marine layer to bring low clouds along the immediate coast from the Peninsula southward through So Cal. The compression of the marine layer will push stratus ceilings closer to the surface producing patchy coastal fog while the compression of the moisture in the lower level may squeeze out a few areas of drizzle in the cooler spots. For tomorrow night, the marine layer will contract/compress much further and mix out in many areas. This should leave most inland areas mostly clear to completely clear for July 4th festivities. One thing worth watching is the presence of Siberian wildfire smoke crossing over the arctic and dropping into the western CONUS over the last day.

The high pressure to the southeast will continue to strengthen and backbuild into all but extreme Northern California through the weekend as the low pressure to the north is shunted northward by the expanding high pressure. As a result, minor to locally moderate warming and drying is forecast to occur between today and the weekend. Tomorrow (Independence day) is forecast to be the warmest and driest day. Inland areas will see the biggest day over day changes given their remoteness to marine influences. These areas will warm to become 6 to 10 degrees above normal tomorrow with afternoon highs in the mid 80s to mid 90s. Meanwhile, daytime humidities will drop into the upper teens to low 20s in the driest spots across the inland higher terrain on Saturday and again on Sunday. These dry conditions through the holiday weekend will lead to elevated fire weather concerns primarily due to human related activities. Please be mindful of these conditions and avoid activities which may ignite wildfires.

By early next week, the same low pressure system over us now remains locked in place over Alberta and will have an opportunity to regain control of our weather pattern Monday night into Tuesday as a series of progressively stronger vorticity waves moves through the base of the trough and rebukes the ridge. This will lead to a slight cooling trend and a rebounding of the marine layer along the coast. Similar conditions will persist through mid week before high pressure attempts to backbuild into the state from the desert southwest late in the week to next weekend.

AVIATION. As of 5:08 PM PDT Friday . For 00Z TAFs. The marine layer varies from 1,300 to 1,500 feet deep. Increasing lower to mid level ridging will compress the marine layer through the period keeping VFR going except for 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 gusting to 25 knots until 04z then easing back to 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 10 to 15 knots early evening diminishing to near 5 knots tonight and Saturday morning. West to northwest winds 10 to 15 knots Saturday afternoon.

MARINE. as of 4:39 PM PDT Friday . Northwest winds are forecast to prevail over the coastal waters today. Winds will increase this evening and tomorrow as surface high pressure builds over the eastern Pacific. Moderate to strong winds are expected over the weekend. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. A long-period southerly swell train will arrive today and 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. Tngt. SCA . SF Bay until 9 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 PM 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



PUBLIC FORECAST: DRP AVIATION: Canepa MARINE: Rowe

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi53 min WNW 11 G 13 78°F 1014 hPa
PCOC1 - 9415144 - Port Chicago, CA 29 mi53 min WSW 11 G 15 75°F 70°F1014.4 hPa
UPBC1 33 mi53 min W 12 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi53 min W 9.9 G 13 74°F 69°F1014.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi62 min W 11
LNDC1 38 mi53 min WSW 6 G 8.9 61°F 1016.5 hPa
AAMC1 - 9414750 - Alameda, CA 39 mi53 min W 8 G 9.9 60°F 69°F1016.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 40 mi53 min SSW 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 40 mi53 min S 4.1 G 6 62°F 1016.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi53 min SW 8.9 G 11 70°F 1014.9 hPa
OBXC1 41 mi53 min 61°F 54°F
RTYC1 - 9414523 - Redwood City, CA 41 mi53 min W 9.9 G 12 70°F 75°F1016.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi53 min SSW 9.9 G 15 61°F 1016.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi53 min WSW 8.9 G 15 59°F 1015.6 hPa
PXSC1 44 mi53 min 60°F 54°F
RCMC1 - 9414863 - Richmond, CA 45 mi53 min SSE 7 G 9.9 62°F 64°F1015.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 47 mi127 min SSW 6 62°F 1016 hPa
FTPC1 - 9414290 - San Francisco, CA 48 mi53 min WSW 11 G 17 58°F 63°F1016.7 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA16 mi54 minNW 1010.00 miFair76°F46°F35%1014.8 hPa
Stockton, Stockton Metropolitan Airport, CA18 mi52 minNW 1010.00 miFair88°F52°F29%1013.6 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrW13W11W8NW7NW4W5W6NW6W4NW5NW4W3W4SW4W5NW53NW5NW9NW13NW16NW12NW13NW10
1 day agoW9NW11NW8NW6NW6NW6NW5NW6NW4CalmCalmNE3Calm44W4CalmSW7NW9
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2 days agoW9NW5NW8W8NW5NW5NW4NW3NW3NW3CalmCalmCalmCalmSW444--NW10NW11W13
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Tide / Current Tables for Borden Highway Bridge, Old River, San Joaquin River, California
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Borden Highway Bridge
Click for Map
Fri -- 04:20 AM PDT     Moonset
Fri -- 05:05 AM PDT     3.65 feet High Tide
Fri -- 05:49 AM PDT     Sunrise
Fri -- 12:49 PM PDT     -0.37 feet Low Tide
Fri -- 07:01 PM PDT     2.54 feet High Tide
Fri -- 07:29 PM PDT     Moonrise
Fri -- 08:32 PM PDT     Sunset
Fri -- 11:49 PM PDT     1.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.62.333.53.73.532.31.60.80.2-0.2-0.4-0.10.51.21.92.42.52.421.61.3

Tide / Current Tables for Vulcan Island .5 mi E, San Joaquin River, California Current
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Vulcan Island .5 mi E
Click for Map
Fri -- 02:06 AM PDT     0.78 knots Max Flood
Fri -- 04:19 AM PDT     Moonset
Fri -- 05:34 AM PDT     -0.00 knots Slack
Fri -- 05:48 AM PDT     Sunrise
Fri -- 09:31 AM PDT     -0.65 knots Max Ebb
Fri -- 01:29 PM PDT     0.00 knots Slack
Fri -- 04:25 PM PDT     0.59 knots Max Flood
Fri -- 07:29 PM PDT     Moonrise
Fri -- 07:33 PM PDT     -0.00 knots Slack
Fri -- 08:31 PM PDT     Sunset
Fri -- 09:40 PM PDT     -0.23 knots Max Ebb
Fri -- 11:57 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.80.70.50.2-0.1-0.4-0.6-0.6-0.6-0.6-0.4-0.10.20.40.60.60.40.1-0.1-0.2-0.2-0.2

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 (22,6,7,8)
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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.