Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
San Rafael, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:18AMSunset 7:57PM Wednesday April 25, 2018 10:50 AM PDT (17:50 UTC) Moonrise 2:36PMMoonset 3:13AM Illumination 79% 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- 845 Am Pdt Wed Apr 25 2018
Today..SW winds 10 to 20 kt.
Tonight..SW winds 10 to 20 kt.
Thu..SW winds 10 to 20 kt.
Thu night..W winds 10 to 20 kt.
Fri..W winds 5 to 15 kt.
Sat..W winds 5 to 15 kt.
Sun..W winds 5 to 15 kt.
PZZ500 845 Am Pdt Wed Apr 25 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate west to northwest winds will continue through the week. Light to moderate seas will also persist through the forecast period with a mixed south and northwest swell developing late in the week.

7 Day Forecast for Marine Location Near San Rafael, CA
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location: 37.98, -122.47     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 251737
afdmtr
area forecast discussion
national weather service san francisco bay area
1037 am pdt Wed apr 25 2018

Synopsis A cooling trend is forecast to persist through late
week and into the upcoming weekend as an upper level trough
approaches from the pacific. This system may produce a few showers
over the north bay late Friday into Saturday as it pushes inland
north of our region, yet widespread rainfall is unlikely.

Discussion As of 3:00 am pdt Wednesday... Onshore flow is
directly east-west as the sfo-sac gradient is 2 mb and the sfo-acv
gradient is neutral. This gives the marine air the maximum effect
over the district. With the marine layer holding around 1500 feet
night and morning low clouds can be expected around much of the
mry and sfo bay area while temperatures will remain as cool as
yesterday.

An upper low centered 750 miles west of point arena will drift
slowly ene. As it gets closer the marine layer will deepen even
more Thursday through Saturday bringing cool marine air into the
interior valleys. Models showing night and morning low clouds
spreading into places like livermore and concord Thursday night.

Eventually the marine layer will mix out but the airmass will be
colder so temperatures will continue below normal. By Saturday
highs around the entire CWA will range from the upper 50s at the
coast to the lower 70s in the far interior. Models continue to
show the upper low moving into northern california on Saturday.

Precipitation chances appear to be very slim and confined to
widely scattered showers in the north bay.

Medium range models now show a slow warming trend for the
beginning and middle of next week as the low moves further inland.

Temperatures should return to near their normal values by about
Wednesday.

Aviation As of 10:37 am pdt Wednesday for 18z tafs. Low
ceilings impacted all TAF terminals this morning with widespread
lifr ifr MVFR conditions. Visible satellite shows the gradual
eroding mixing-out of the stratus as of the 18z TAF publication
and think most terminals will transition toVFR conditions in the
next hour or so. The fort ord profiler indicates the marine layer
as gradually increased over the past 12 hours from about 1,500 ft
to 2,000 ft deep, likely in response to the approaching upper
level low. More of the same is expected this tonight with low
clouds again for Thursday morning.

Vicinity of ksfo... Transitioning from MVFR toVFR conditions at
the TAF publication time as this morning's stratus mixes out.

West to northwest winds are expected this afternoon around 15 kt.

The main concern turns to what is going to happen this
evening overnight with the stratus return. At this point think
we'll see bkn conditions return sometime after 6-7z Thursday, or
several hours earlier than this morning. Will continue to monitor
and update the TAF accordingly.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr conditions at kmry until late
morning as stratus lingers over the terminal. There is a non-zero
chance we could see the low clouds persist into the afternoon, but
confidence is too low to adjust the TAF as so. Expect low clouds
to return sometime in the late afternoon evening hours with
overcast conditions again for tomorrow morning.

Marine As of 10:21 am pdt Wednesday... Generally light to
locally moderate west to northwest winds will continue through
the week. Light to moderate seas will also persist through the
forecast period with a mixed south and northwest swell developing
late in the week.

Mtr watches warnings advisories
Tday None.

Public forecast: W pi
aviation: rowe
marine: rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 5 mi50 min S 5.1 G 8.9 53°F 57°F1018.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi57 min ESE 2.9 53°F 1019 hPa (+1.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi50 min SW 7 G 9.9 53°F 1019.1 hPa
FTPC1 - 9414290 - San Francisco, CA 12 mi50 min WSW 6 G 11 52°F 54°F1019.3 hPa (+1.2)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 12 mi50 min W 7 G 8.9 55°F 1018.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 13 mi50 min N 1 G 5.1 56°F 1017.9 hPa (+1.0)
PXSC1 13 mi50 min 55°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi50 min SSW 1 G 2.9
OBXC1 14 mi56 min 53°F 47°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi50 min WSW 2.9 G 6 55°F 1019 hPa (+1.0)
46237 - San Francisco Bar, CA (142) 16 mi50 min 53°F5 ft
LNDC1 16 mi50 min W 1.9 G 6 53°F 1018.9 hPa (+1.0)
AAMC1 - 9414750 - Alameda, CA 17 mi50 min W 4.1 G 6 53°F 60°F1019 hPa (+0.9)
MZXC1 - 9415102 - Martinez-Amorco CA 19 mi50 min W 12 G 14 54°F 62°F1018.2 hPa (+0.7)54°F
PCOC1 - 9415144 - Port Chicago, CA 23 mi50 min W 16 G 19 54°F 62°F1017.8 hPa (+0.8)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 25 mi60 min SW 1.9 G 5.8 50°F 54°F5 ft1019.1 hPa (+1.5)
PRYC1 - 9415020 - Point Reyes, CA 27 mi50 min S 2.9 G 4.1 55°F1018.9 hPa (+1.5)
SFXC1 - San Francisco Bay Reserve, CA 28 mi65 min WNW 11 56°F 1017 hPa48°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 31 mi56 min WNW 13 G 18 59°F 1017 hPa
RTYC1 - 9414523 - Redwood City, CA 35 mi50 min NNE 4.1 G 5.1 55°F 66°F1019 hPa (+0.7)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 48 mi40 min WNW 3.9 G 5.8 51°F 1019.3 hPa46°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi60 min S 1.9 G 5.8 52°F 56°F8 ft1018.7 hPa (+1.3)

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA12 mi75 minN 010.00 miMostly Cloudy55°F48°F77%1018.6 hPa
Napa, Napa County Airport, CA19 mi56 minWSW 610.00 miOvercast52°F46°F83%1017.8 hPa
Petaluma Municipal Airport, CA20 mi55 minVar 58.00 miOvercast52°F48°F88%1019 hPa
Concord, Buchanan Field, CA22 mi57 minN 010.00 miFair61°F48°F65%1016.6 hPa
Oakland, Metro Oakland International Airport, CA23 mi57 minNW 410.00 miOvercast54°F48°F80%1018.8 hPa

Wind History from DVO (wind in knots)
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Last 24hrCalm5CalmN6N13N13N12NW11N12N13N10NW7CalmNW3N3CalmCalmCalmCalmCalmCalmCalmNE43
1 day agoCalm5E6
G12
5SE7SE7N10N13N12
G18
N8E5----N7CalmCalmCalmCalmCalmSW3SW3NW7N3Calm
2 days agoE4CalmCalmCalmCalmN9N6N11N5N3SE4N4CalmN4CalmCalmCalmCalmCalmCalmSE3CalmCalmCalm

Tide / Current Tables for Point San Quentin, San Francisco Bay, California
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Point San Quentin
Click for Map
Wed -- 03:34 AM PDT     1.62 feet Low Tide
Wed -- 04:12 AM PDT     Moonset
Wed -- 06:21 AM PDT     Sunrise
Wed -- 09:18 AM PDT     4.93 feet High Tide
Wed -- 03:36 PM PDT     Moonrise
Wed -- 03:44 PM PDT     -0.01 feet Low Tide
Wed -- 07:55 PM PDT     Sunset
Wed -- 10:35 PM PDT     5.47 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
43.12.21.71.72.12.83.74.54.94.84.23.11.90.80.100.41.32.43.64.75.35.4

Tide / Current Tables for Point San Pablo Midchannel, San Pablo Bay, California Current
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Point San Pablo Midchannel
Click for Map
Wed -- 02:41 AM PDT     -2.14 knots Max Ebb
Wed -- 04:12 AM PDT     Moonset
Wed -- 05:28 AM PDT     0.00 knots Slack
Wed -- 06:20 AM PDT     Sunrise
Wed -- 08:24 AM PDT     1.67 knots Max Flood
Wed -- 11:11 AM PDT     -0.00 knots Slack
Wed -- 02:37 PM PDT     -2.67 knots Max Ebb
Wed -- 03:36 PM PDT     Moonrise
Wed -- 06:01 PM PDT     0.00 knots Slack
Wed -- 07:55 PM PDT     Sunset
Wed -- 09:35 PM PDT     2.21 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-1.2-2-2.1-1.6-0.60.51.31.61.61.10.2-1-2-2.6-2.6-2.2-1.3-011.72.12.21.7

Weather Map and Satellite Images
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wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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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.