Thursday, April18, 2019 L-36.com


Marine Weather and Tides
Belvedere, 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 6:28AMSunset 7:49PM Thursday April 18, 2019 11:59 AM PDT (18:59 UTC) Moonrise 6:12PMMoonset 5:25AM 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- 850 Am Pdt Thu Apr 18 2019
Today..SW winds up to 10 kt...becoming W this afternoon.
Tonight..SW winds up to 10 kt.
Fri..SW winds 5 to 15 kt with gusts up to 25 kt.
Fri night..SW winds 10 to 20 kt with gusts up to 25 kt.
Sat..W winds 10 to 20 kt with gusts up to 30 kt.
Sat night..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..W winds up to 10 kt.
Mon..W winds 5 to 10 kt.
PZZ500 850 Am Pdt Thu Apr 18 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Weakening high pressure over the offshore waters will keep light to moderate northwest winds through Thursday night. High pressure will rebuild over the eastern pacific on Friday resulting in increasing northwest winds over the coastal waters that will last through the weekend.


7 Day Forecast for Marine Location Near Belvedere, CA
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location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 181747
afdmtr
area forecast discussion
national weather service san francisco bay area
1047 am pdt Thu apr 18 2019

Synopsis Warmer temperatures are forecast for today,
especially inland areas where widespread highs in the lower to mid
80s are expected. A cooling trend is then expected to begin
Friday and continue into the weekend as onshore flow redevelops
and strengthens. This will be followed by renewed warming for the
first part of next week. No precipitation is expected through the
forecast period.

Discussion As of 09:23 am pdt Thursday... High pressure over the
bay area started out a little stronger this morning than expected.

As such cloud cover over most land locations has been non-
existent. A few clouds are lingering in some isolated pockets of
coastal location, but should dissipate for a while late morning
into early afternoon.

Most sites have been running about 3 to 6 degrees over yesterday,
so far this morning. We continue to expect a rise of the mercury
into the 70s (coastal) and 80s (inland) for nearly all locations.

The main change to the forecast this morning was to bump up the
temps away from the coast by a degree or two. Just a touch warmer
than the early morning forecast. Enjoy the day as we will cool a
bit going into the weekend and increase cloud cover a bit as a
system clips our area.

Prev discussion As of 02:42 am pdt Thursday... GOES satellite fog
product reveals mostly clear skies around the bay area overnight
with a few exceptions: developing stratus over the coastal
waters, patchy low clouds developing along portions of the
immediate coastline and patchy fog low clouds north bay valleys.

Current forecast will have some patchy low clouds fog possible
early this morning, but impacts will be minimal.

The bigger weather story for the day will be the noticeable warm
up. Synoptically speaking, a large upper level ridge currently
along the west coast will strengthen as it moves eastward. The
building ridge can be seen by looking at increasing 500 mb heights
and warming temperatures at 850 mb. Observed highs on Wednesday
were upper 50s to upper 60s near the coast and 70s to near 80
inland. Generally speaking a modest 5 to 10 degrees of warming
will be seen today with a few spots approaching 15 degrees of
warming compare to Wednesday. In other words, highs in the 60s to
mid 70s along the coast and widespread 80s inland. It's possible
that a few interior locations in monterey san benito counties may
eclipse 90 degrees. Temperatures this warm are about 5 to 10
degrees above normal for mid april. One limiting factor for really
warm weather is the lack of offshore flow and continued onshore
flow, especially near the coast. From a heat risk standpoint,
there is enough cooling (relief) Thursday night and Friday that
impacts will be minimal. However, today could be the warmest day
so far this year for some locations so some precaution should be
used - stay hydrated, monitor activities during peak heating of
the day, take breaks, etc.

The warm up will be short-lived as the ridge moves east, an upper
level low undercuts the ridge across socal and low level onshore
flow ramps on Friday. A general cooldown of 3 to 5 degrees is
expected on Friday with a slight increase of early morning
clouds patchy fog. Not a full force summer stratus push just yet,
but more of a preview.

An even bigger cooldown is expected on Saturday as an upper level
low swings through norcal bringing increasing clouds, cooler 850
mb temps and possible precipitation to ca. 00z model suite
continues to show mixed results on potential precip impacting the
bay area on Saturday. Current forecast will remain dry at this
point as best chance still remains N and E of the forecast area.

Will keep a close eye on this and precip may added to the forecast
later. High temperatures will be cool and mostly in the 60s an
lower 70s. Interesting to see the temp swing from above normal on
Thursday to below normal for Saturday.

Similarly to the initial warm up, the cooldown will be short-
lived as well. High pressure is forecast to re-build over the
region Sunday into Monday. The warming trend is forecast to
continue well into next week. If some of the medium range models
and ensembles are correct the second round of warming may be even
warmer than the Thursday warm up. Interior locations may hit the
upper 80s to lower 90s next Wednesday and Thursday.

Longer range forecast indicate that the wet season may be ending
and the dry season is beginning. The latest 8 to 14 day cpc
outlook has much of norcal drier than normal through may 1.

Aviation As of 10:47 am pdt Thursday... For 18z tafs.VFR
conditions are forecast to prevail through the day as an upper
level ridge remains in control over the region. Light variable
winds this morning will gradually shift and become onshore this
afternoon, generally at or below 12 kt. TheVFR conditions should
continue overnight and into tomorrow morning, though can't rule
out the potential for some patchy fog in the north bay valleys.

Vicinity of ksfo...VFR conditions are forecast to prevail through
the period with passing high clouds. Light northeast winds this
morning will become west to northwest in the afternoon up to
around 10-12 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions are forecast to prevail
through the period. Light to moderate offshore winds this morning
will become onshore by the afternoon between 7-11 kt.

Marine As of 8:50 am pdt Thursday... Weakening high pressure
over the offshore waters will keep light to moderate northwest
winds through Thursday night. High pressure will rebuild over the
eastern pacific on Friday resulting in increasing northwest winds
over the coastal waters that will last through the weekend.

Mtr watches warnings advisories
Tday None.

Public forecast: bfg mm
aviation: rowe st
marine: st
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi47 min E 4.1 G 4.1 58°F 54°F1021.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi41 min NNW 4.1 G 5.1 58°F 1019.8 hPa
PXSC1 3 mi41 min 59°F 56°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi48 min NNW 7 59°F 1021 hPa
OBXC1 6 mi47 min 59°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi41 min NNW 2.9 G 4.1 59°F 1020.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi47 min W 4.1 G 4.1
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi41 min 66°F 1021 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi47 min WNW 5.1 G 6 60°F 58°F1020.6 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi47 min W 5.1 G 6 60°F 60°F1021.1 hPa
LNDC1 9 mi41 min N 5.1 G 6 64°F 1020.5 hPa
46237 - San Francisco Bar, CA (142) 11 mi149 min 56°F6 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi41 min WNW 5.1 G 5.1 63°F 1020.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi39 min WNW 7.8 G 9.7 51°F 54°F1021.3 hPa
UPBC1 22 mi41 min ENE 7 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi41 min NNE 4.1 G 5.1 63°F 60°F1021 hPa57°F
RTYC1 - 9414523 - Redwood City, CA 25 mi41 min N 4.1 G 5.1 64°F 64°F1021.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi41 min ENE 7 G 7 64°F 60°F1021 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi41 min 51°F1020.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi41 min NE 5.1 G 5.1 64°F 1020.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi74 min ESE 1.9 69°F 1021 hPa55°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA15 mi66 minWSW 510.00 miA Few Clouds63°F52°F68%1020.9 hPa
San Francisco, San Francisco International Airport, CA15 mi63 minNE 310.00 miPartly Cloudy61°F53°F75%1020.4 hPa
Hayward, Hayward Air Terminal, CA21 mi65 minW 310.00 miFair65°F54°F68%1021.5 hPa
Half Moon Bay Airport, CA22 mi64 minW 65.00 miFog/Mist55°F53°F94%1020.7 hPa
Concord, Buchanan Field, CA23 mi66 minN 610.00 miFair71°F52°F51%1019.4 hPa
San Carlos Airport, CA23 mi65 minVar 310.00 miA Few Clouds64°F55°F73%1020.7 hPa
Novato / Gnoss Field, CA23 mi64 minSSE 310.00 miFair68°F51°F56%1021 hPa

Wind History from SFO (wind in knots)
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Last 24hrNE7NW9NW9NW14NW15NW14W19W18W16W18NW12W10W10W10W9W6W5W4CalmCalmCalmCalmNE4NE3
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W17W14W16W10W9W8W7W4W7S3CalmW7W4NW9N4
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Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
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Thu -- 05:38 AM PDT     0.10 feet Low Tide
Thu -- 06:24 AM PDT     Moonset
Thu -- 06:30 AM PDT     Sunrise
Thu -- 12:01 PM PDT     5.48 feet High Tide
Thu -- 05:44 PM PDT     0.40 feet Low Tide
Thu -- 07:12 PM PDT     Moonrise
Thu -- 07:48 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.342.41.10.20.10.71.734.25.15.55.14.12.71.40.60.40.91.93.24.55.5

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Thu -- 12:56 AM PDT     -0.00 knots Slack
Thu -- 03:44 AM PDT     -2.82 knots Max Ebb
Thu -- 06:24 AM PDT     Moonset
Thu -- 06:30 AM PDT     Sunrise
Thu -- 07:01 AM PDT     0.00 knots Slack
Thu -- 10:03 AM PDT     3.44 knots Max Flood
Thu -- 01:25 PM PDT     -0.00 knots Slack
Thu -- 04:06 PM PDT     -2.61 knots Max Ebb
Thu -- 07:12 PM PDT     Moonrise
Thu -- 07:17 PM PDT     0.01 knots Slack
Thu -- 07:48 PM PDT     Sunset
Thu -- 10:16 PM PDT     3.29 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.6-0.1-1.6-2.6-2.8-2.3-1.4-01.733.43.22.20.7-0.9-2.1-2.6-2.3-1.6-0.41.22.63.33.1

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, 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.