Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
Piedmont, CA

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:53AMSunset 7:10PM Wednesday September 19, 2018 1:26 PM PDT (20:26 UTC) Moonrise 3:27PMMoonset 12:44AM Illumination 74% Phase: Waxing Gibbous; Moon at 10 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 San Francisco Bay North Of The Bay Bridge- 834 Am Pdt Wed Sep 19 2018
Today..SW winds 5 to 15 kt.
Tonight..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 10 to 20 kt.
Sat..W winds 5 to 15 kt.
Sun..W winds 5 to 15 kt.
PZZ500 834 Am Pdt Wed Sep 19 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally strong northerly winds will prevail over the coastal waters today as high pressure remains over the eastern pacific. Gusty winds will generate steep wind waves creating hazardous sea conditions, especially for smaller vessels. Winds will then diminish late this week as the high pressure weakens and the thermal trough shifts towards the coast.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 191741
afdmtr
area forecast discussion
national weather service san francisco bay area
1041 am pdt Wed sep 19 2018

Synopsis A warming and drying trend will begin over the area
today and continue into Thursday as onshore flow weakens. Gusty
northerly winds in higher elevations will result in enhanced fire
weather concerns from tonight into Thursday morning, mainly in
the hills of eastern napa county. Temperatures moderate slightly
over the upcoming weekend but will remain near to slightly above
seasonal averages.

Discussion As of 9:16 am pdt Wednesday... The marine layer has
deepened overnight to around 2000 feet, and satellite imagery
shows coastal stratus has pushed well inland through the monterey
bay area filling the salinas valley, and also extending northward
into southern santa clara county. Stratus coverage is much more
patchy over the san francisco bays with oak being the only bay
area airport affected by low ceilings at this time. Surface
pressure gradients are still predominately onshore with 1.1 mb
from sfo to sac, but the northerly gradient from acv-sfo is much
tighter versus 24 hours ago with 5.3 mb compared to 1.9 mb
yesterday at this time. This tight northerly gradient will
produced gusty winds across the north bay mountains, where a fire
weather watch remains in effect through tonight for gusty winds
and poor rh recoveries. Gusty winds are also possible tonight over
the east bay hills as well as the santa cruz mountains.

The upper level trough currently over california will continue to
move to the east as high pressure aloft builds in from the eastern
pacific. This will produce a warming trend over the next few days,
peaking on Thursday when high temperatures are forecast to edge
into the 90s across the warmest inland areas, with 60s and 70s
along the coast.

Latest medium range model runs bring a weak trough across the
pacnw over the weekend with high pressure rebuilding over the
eastern pacific early next week. Thus, temperatures should remain
around normal or slightly above.

Aviation As of 10:35 am pdt Wednesday... For 18z tafs.

TrendingVFR at all terminals as low clouds continue to erode.

ExpectVFR this afternoon tonight. Offshore flow is forecast to
develop overnight leading to dry of the low levels. This should
keep the sf bay are clear. Monterey bay area on the other hand
could have some low clouds early in the night before clearing
early tomorrow morning. Decided to include llws for koak for
tomorrow morning. Light and vrb at the surface with gusty NE winds
over the east bay hills.

Vicinity of ksfo...VFR. Gusty onshore this afternoon.VFR tonight
with gusty offshore flow.

Sfo bridge approach... .Similar to sfo.

Monterey bay terminals... .Vfr this afternoon. Some CIGS poss early
tonight then clearing early tomorrow.

Marine As of 8:34 am pdt Wednesday... Moderate to locally
strong northerly winds will prevail over the coastal waters today
as high pressure remains over the eastern pacific. Gusty winds
will generate steep wind waves creating hazardous sea conditions,
especially for smaller vessels. Winds will then diminish late this
week as the high pressure weakens and the thermal trough shifts
towards the coast.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 11 am
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Mry bay from 2 pm
public forecast: sims
aviation: mm
marine: mm
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi38 min WNW 5.1 G 8 65°F 1012.6 hPa
OBXC1 7 mi38 min 62°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi38 min WNW 8 G 8.9 61°F 1012.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi44 min NW 6 G 7
AAMC1 - 9414750 - Alameda, CA 7 mi44 min WSW 5.1 G 6 62°F 66°F1012.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi38 min SW 5.1 G 7 64°F 1013 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi38 min NW 5.1 G 8 66°F 1011.7 hPa
PXSC1 10 mi44 min 67°F 55°F
RCMC1 - 9414863 - Richmond, CA 11 mi38 min 63°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi39 min SSE 4.1 66°F 1013 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi44 min WSW 8 G 14 59°F 60°F1013.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi38 min 66°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi38 min W 4.1 G 5.1 65°F 1012.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 17 mi38 min W 2.9 G 4.1 71°F 66°F1012.1 hPa
46237 - San Francisco Bar, CA (142) 22 mi56 min 58°F4 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi38 min NW 6 G 7 71°F 1011.8 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi38 min NNW 8.9 G 12 65°F 68°F1013 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi101 min W 4.1 72°F 1013 hPa51°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi26 min NW 12 G 16 54°F 54°F1013.9 hPa (-0.3)
PRYC1 - 9415020 - Point Reyes, CA 41 mi38 min WNW 15 G 18 53°F1013.1 hPa

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi33 minW 710.00 miFair67°F52°F59%1012.7 hPa
Concord, Buchanan Field, CA13 mi33 minVar 510.00 miFair79°F50°F36%1010.6 hPa
Hayward, Hayward Air Terminal, CA14 mi32 minW 610.00 miFair70°F53°F55%1013.2 hPa
San Francisco, San Francisco International Airport, CA18 mi90 minNE 510.00 miA Few Clouds64°F53°F68%1012.9 hPa
Livermore, Livermore Municipal Airport, CA24 mi33 minVar 410.00 miFair76°F48°F39%1011.3 hPa

Wind History from OAK (wind in knots)
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Last 24hrNW12W15W14W12W11W12NW6W7NE4NE3S9SW12SW8SW8S9SW8SW7CalmS5S5CalmSW6W6W7
1 day agoW9W11W14W15W12W12W14W14W12W13SW7SW9SW6SW6SW8SW6S74SW8S10W93W6NW5
2 days agoW10W12W14W16W17W17
G25
W15W13W8NW4CalmS9SW8SW9SW11SW7SW7W7SW8S7SW7W5W6W9

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (16,3,4,5)
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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.