Tuesday, November20, 2018 L-36.com


Marine Weather and Tides
Mountain House, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:50AMSunset 4:52PM Tuesday November 20, 2018 11:35 AM PST (19:35 UTC) Moonrise 3:45PMMoonset 3:56AM Illumination 95% 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- 849 Am Pst Tue Nov 20 2018
.small craft advisory in effect from late tonight through Wednesday afternoon...
Today..NE winds up to 10 kt...becoming sw this afternoon. Hazy.
Tonight..S winds 5 to 15 kt. A chance of rain.
Wed..S winds 15 to 25 kt with gusts up to 30 kt. Rain.
Wed night..SW winds 5 to 15 kt with gusts up to 25 kt. Showers likely.
Thanksgiving day..SW winds 5 to 15 kt with gusts up to 25 kt. A chance of showers.
Thu night..S winds 15 to 25 kt with gusts up to 30 kt. Rain.
Fri..SW winds 5 to 15 kt. Rain.
Sat..W winds up to 10 kt.
PZZ500 849 Am Pst Tue Nov 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An approaching storm system has resulted in southerly winds across the waters early today. Southerly winds will steadily increase as the storm system nears, with a frontal passage expected across the water early Wednesday. Infrequent to occasional gale force gusts will be possible near the frontal boundary, with otherwise small craft advisory winds expected tonight and Wednesday. Winds ease Thursday but another system will bring strengthening winds by Thursday night. Light mixed swell today, with a longer period northwesterly swell train arriving tonight into Wednesday.


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 201800
afdmtr
area forecast discussion
national weather service san francisco bay area
1000 am pst Tue nov 20 2018

Synopsis Today will be the final day of hazy smoky conditions.

An approaching weather system will bring widespread rain and
gusty winds to the region late tonight and Wednesday, with
scattered showers continuing through Wednesday night. A second
system is expected to bring additional rainfall to the area from
Thursday afternoon through Friday. Dry weather will likely return
to most areas over the weekend.

Discussion As of 09:00 am pst Tuesday... Upper level pattern
this morning consists of a ridge now centered to our east with a
deep trough to our west, centered at about 140w. A weak offshore
pressure gradient is continuing to keep smoke across the bay area
and winds light. Visibilities have improved over the past 24 hours
with most locations throughout the bay reporting 3-6 miles.

Southeast winds in the higher terrain have already started to
increase in response to the approaching trough, with speeds of
10-20 mph observed at ridge tops. Patchy low clouds along the
coast will decrease into the afternoon, but high clouds will
increase during the day in advance of the trough.

Overnight temperatures were chilly one more time ahead of the
major pattern shift expected on Wednesday. Lows were in the 30s
across the inland valleys and the 40s elsewhere. Lows for the next
several nights will be milder as moisture and cloud cover prevent
strong overnight radiational cooling. Conditions today will be
similar to yesterday with highs in the 60s in most locations to
lower 70s in parts of inland monterey and san benito counties.

Smoke will continue to gradually decrease today but major
improvement is expected on Wednesday as increased winds and rain
act to remove the smoke. The return of rainfall will create slick
roads and could impact motorists traveling to holiday
destinations. No updates this morning.

Prev discussion As of 3:40 am pst Tuesday... Skies are mostly clear
early this morning except for patchy low clouds at the coast.

Visibilities in the san francisco bay area range from 3 to 6 miles
in haze and smoke. These visibilities represent a slight
improvement from the past several days and the hrrr smoke model
indicates that air quality will continue to slowly improve
through today. Much improved air quality will then occur by late
tonight and Wednesday thanks to rain and gusty winds that will
arrive with an approaching pacific weather system. In the
meantime, expect one more day of hazy skies, light winds, and mild
temperatures.

The models have come into relatively good agreement regarding two
weather systems due to impact our area this week. IR satellite
imagery currently shows the first incoming system offshore with a
frontal boundary along 135w and a large area of convective clouds
behind the front indicative of a cold and unstable airmass.

Precipitation is expected to begin spreading onshore late
tonight, but the bulk of the precipitation with this first system
is expected to fall on Wednesday as a frontal boundary sweeps
across our region. Rainfall intensity with this first system is
expected to be mostly light to moderate, but a brief period of
heavy rain is possible along the frontal boundary as it moves
through our area from late Wednesday morning through Wednesday
afternoon. In addition, isolated thunderstorms are possible
Wednesday afternoon and evening as the cold and unstable airmass
behind the front arrives. The models indicate that the most
unstable airmass will be offshore. So if thunderstorms do develop,
they will most likely be over our coastal waters. However, both
the NAM and GFS are forecasting some of this unstable air to make
its way inland by late Wednesday. Have therefore added slight
thunderstorm chances to coastal land areas on Wednesday evening.

Southerly winds are forecast to increase late tonight in advance
of the incoming system. Winds will be strongest on Wednesday just
ahead of the frontal boundary. Strongest winds are expected near
the ocean and in the hills where local gusts as high as 40 mph are
likely. Winds are not expected to be strong enough to warrant a
wind advisory.

Scattered showers will continue behind the front through late
Wednesday night and a few showers may linger until about sunrise
on thanksgiving morning. A brief period of dry weather is then
expected before the second system approaches from the northwest
and begins to generate warm advection rainfall across the north
bay on Thursday afternoon and evening. Rain is then expected to
spread gradually south across much of the rest of our forecast
area from late Thursday night through Friday.

The first system is forecast to generate rather uniform rainfall
amounts across our region, with rain totals of a half inch to an
inch expected in most areas from late Tuesday night through
Wednesday night. Some of the wetter locations in the coastal hills
may see up to 1.5 inches with the first system. The second system
will focus its heaviest rainfall across the north bay, with
rainfall amounts expected to taper off significantly farther to
the south. Rainfall totals from Thursday afternoon through late
Friday are forecast to range from 0.75-2.50 inches in the north
bay, from 0.25-0.75 inches across the remainder of the sf bay area
and santa cruz county, and only about a quarter inch or less
across monterey and san benito counties. Gusty winds are also
expected with the second system, mainly across the sf bay area
from late Thursday through midday Friday.

Showers are expected to taper off on Friday night and dry weather
is likely to return to most areas by Saturday. In fact, the models
are in rather good agreement in forecasting a shortwave ridge over
california through the upcoming weekend and into the early part
of next week, resulting in dry conditions and mild temperatures.

Longer range models, especially the gfs, indicate the potential
for significant rainfall later next week, in the Wednesday-
Thursday time frame, as a potential atmospheric river takes aim at
northern and central california.

Aviation As of 10:00 am pst Tuesday... For 18z tafs. Some
lingering smoke throughout the region today during the daylight
hours ahead of an approaching storm system will result in MVFR
with brief ifr visbys thru the sf bay area. The approach storm
system will results in predominately light to breezy southerly
winds ahead of the arrival of the main frontal band. The rain and
wind from the storm will help to clear the air of smoke, bringing
improved visibilities back toVFR range. Brief reductions in
visibility may be possible during the heaviest rains. Ceilings
generally on the MVFR-vfr range (2500-3500 ft agl) with
-shra -ra ra. Brief heavy rain and gusty winds may accompany any
convection showers that develop with the storm system. Wet
runways will be an impact for the first time in a long time.

Vicinity of ksfo... Light winds today with some reductions in
visibility from lingering smoke. However visibility will
gradually improve today through Wednesday with the arrival of a
storm system. Winds increase and turn more southwesterly with
arrival of storm system. Wet runways by Wednesday morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Winds generally 8kt or less today with
fair visibility around 5 to 8 miles. Winds become more SW and
increase, particular in the salinas valley, ahead of arrival of
next storm system. Winds at ksns become gusty by Wednesday
morning. Wet runways possible with main frontal band arriving late
wed morn.

Marine As of 09:40 am pst Tuesday... An approaching storm system
has resulted in southerly winds across the waters early today.

Southerly winds will steadily increase as the storm system nears,
with a frontal passage expected across the water early Wednesday.

Infrequent to occasional gale force gusts will be possible near
the frontal boundary, with otherwise small craft advisory winds
expected tonight and Wednesday. Winds ease Thursday but another
system will bring strengthening winds by Thursday night. Light
mixed swell today, with a longer period northwesterly swell train
arriving tonight into Wednesday.

Mtr watches warnings advisories
Tday None.

Public forecast: st
aviation: drp
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi36 min NNW 1.9 G 1.9 53°F 1017.2 hPa (+0.0)
PCOC1 - 9415144 - Port Chicago, CA 29 mi36 min N 1 G 1.9 53°F 56°F1017.5 hPa (+0.4)
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi36 min NNE 4.1 G 4.1 53°F 56°F1017.5 hPa (+0.4)36°F
SFXC1 - San Francisco Bay Reserve, CA 35 mi51 min WSW 2.9 56°F 1017 hPa39°F
LNDC1 38 mi96 min SW 2.9 G 4.1 54°F 1017.2 hPa (+1.5)
AAMC1 - 9414750 - Alameda, CA 39 mi36 min S 1.9 G 4.1 55°F 56°F1017.5 hPa (+0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi36 min NW 1.9 G 4.1 56°F 1017.1 hPa (+0.5)
OKXC1 - 9414776 - Oakland (Berth 34), CA 40 mi36 min NNW 1.9 G 1.9 53°F 1017.3 hPa (+0.7)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 40 mi36 min W 1.9 G 2.9
OBXC1 41 mi36 min 54°F 49°F
RTYC1 - 9414523 - Redwood City, CA 41 mi36 min NNW 2.9 G 4.1 56°F 57°F1017.4 hPa (+0.4)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi36 min Calm G 2.9 61°F 1017.5 hPa (+0.5)
PXSC1 44 mi36 min 54°F 48°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi36 min ENE 1.9 G 2.9 53°F 1016.3 hPa (+0.7)
RCMC1 - 9414863 - Richmond, CA 45 mi36 min Calm G 1.9 53°F 56°F1016.9 hPa (+0.6)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 47 mi31 min N 5.1 53°F 1017 hPa
FTPC1 - 9414290 - San Francisco, CA 48 mi36 min NE 2.9 G 2.9 54°F 55°F1017.3 hPa (+0.4)

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA16 mi43 minN 03.00 miHaze Smoke57°F30°F37%1016.9 hPa
Stockton, Stockton Metropolitan Airport, CA18 mi41 minN 01.75 miOvercast with Haze58°F37°F48%1017.1 hPa

Wind History from LVK (wind in knots)
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Last 24hrNE7NE10E9E8E5NE6NE3NE3CalmE6CalmNE3CalmCalmE3E5CalmCalmCalmE3CalmCalmCalmCalm
1 day agoE10E9NE8E3CalmNE3NE3CalmCalmNE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW4Calm
2 days agoCalm4CalmSW4SW4NW5CalmE3CalmCalmE3E3E4E3E4E3CalmCalmCalmNE3CalmCalmCalmCalm

Tide / Current Tables for Borden Highway Bridge, Old River, San Joaquin River, California
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Borden Highway Bridge
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Tue -- 03:56 AM PST     Moonset
Tue -- 04:24 AM PST     2.28 feet High Tide
Tue -- 06:52 AM PST     Sunrise
Tue -- 10:00 AM PST     0.47 feet Low Tide
Tue -- 03:44 PM PST     Moonrise
Tue -- 04:18 PM PST     3.02 feet High Tide
Tue -- 04:51 PM PST     Sunset
Tue -- 11:16 PM PST     0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.11.622.32.21.91.40.90.60.50.611.72.32.832.92.621.30.70.30.1

Tide / Current Tables for Vulcan Island .5 mi E, San Joaquin River, California Current
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Vulcan Island .5 mi E
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Tue -- 01:46 AM PST     0.50 knots Max Flood
Tue -- 03:55 AM PST     Moonset
Tue -- 04:41 AM PST     -0.00 knots Slack
Tue -- 06:51 AM PST     Sunrise
Tue -- 07:18 AM PST     -0.37 knots Max Ebb
Tue -- 10:21 AM PST     0.00 knots Slack
Tue -- 01:14 PM PST     0.72 knots Max Flood
Tue -- 03:44 PM PST     Moonrise
Tue -- 04:40 PM PST     -0.00 knots Slack
Tue -- 04:50 PM PST     Sunset
Tue -- 07:59 PM PST     -0.55 knots Max Ebb
Tue -- 11:50 PM PST     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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0.30.50.50.40.2-0.1-0.3-0.4-0.3-0.3-0.10.20.60.70.70.50.2-0.1-0.3-0.5-0.5-0.5-0.4-0.2

Weather Map and Satellite Images
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GOES 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 (14,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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Disclaimer:
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.