Monday, June17, 2019 L-36.com


Marine Weather and Tides
Belvedere, CA

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6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 5:45AMSunset 8:35PM Monday June 17, 2019 4:40 AM PDT (11:40 UTC) Moonrise 8:07PMMoonset 5:08AM Illumination 100% Phase: Full Moon; Moon at 15 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- 319 Am Pdt Mon Jun 17 2019
Today..SW winds 10 to 20 kt.
Tonight..SW winds 10 to 15 kt.
Tue..SW winds 10 to 20 kt.
Tue night..SW winds 15 to 20 kt with a few gusts up to 25 kt.
Wed..SW winds 10 to 20 kt with gusts up to 30 kt.
Wed night..SW winds 15 to 20 kt with gusts up to 25 kt.
Thu..SW winds 10 to 15 kt.
Fri..SW winds 10 to 15 kt.
PZZ500 319 Am Pdt Mon Jun 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the pacific northwest will result in gusty northwest winds mainly over the northern outer waters through this week.


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 171003
afdmtr
area forecast discussion
national weather service san francisco bay area
303 am pdt Mon jun 17 2019

Synopsis Warmer temperatures are forecast for today and Tuesday
as high pressure strengthens over california, and onshore flow
weakens. However, warming at coastal areas will be limited due to
persistent onshore winds. Seasonable temperatures, along with
areas of night and morning low clouds, are forecast through the
end of the week and into next weekend.

Discussion As of 3:00 am pdt Monday... Low clouds have developed
well inland, and into most valleys, once again this morning as
the marine layer remains relatively deep (2000 feet currently at
fort ord). Patchy drizzle is occurring in coastal areas, but
drizzle is not as widespread, or generating as much measurable
precipitation, compared to early yesterday morning.

The marine layer is expected to compress today as an upper ridge
over the eastern pacific starts to build inland across northern
california. Also, surface onshore pressure gradients are trending
weaker. These developments are expected to result in earlier
inland clearing of low clouds today as well as warmer
temperatures. Today's high temperatures are forecast to be 5 to
10 degrees warmer than yesterday in most areas, which would bring
our temps back to about seasonal averages. Persistent onshore flow
and only partial afternoon clearing near the ocean will mean
warming near the coast today will only be about 5 degrees, or
less. The most robust warming will occur in the hills and inland
valleys. The national blend of models (nbm) has been too warm over
the past few days, and this warm bias by the nbm appears to be
continuing. Therefore, maximum temperatures for today, and through
much of the week ahead, have been adjusted downward from the nbm
by an average of about five degrees.

Another area where the nbm appears to be deficient is in how it's
handling marine layer clouds. Specifically, low clouds are more
widespread at present than indicated by the nbm, and the nbm is
indicating a significant reduction in night and morning low
clouds as the week progresses, something that doesn't appear to be
rooted in reality given the persistent onshore flow depicted by
the models. Therefore, cloud cover has been increased,
particularly in coastal areas, over what is forecast by the nbm.

Warmer temperatures are expected to persist into Tuesday. In
fact, we will likely see a few additional degrees of warming on
Tuesday as h5 heights increase to 588 dm and 850 mb temps warm to
25 deg c. However, temperatures at the surface are not expected to
warm anywhere near the record-breaking heat of a weak ago when
offshore flow developed. By contrast, onshore flow is expected to
persist this week which will keep surface temperatures in check,
particularly in coastal areas.

An upper trough currently in the gulf of alaska is forecast to
slide to the southeast and into the pacific northwest by midweek.

This will likely result in slight cooling on Wednesday, and a few
additional degrees of cooling on Thursday as the trough digs into
the northern great basin, forcing the ridge to retreat offshore.

Temperatures are then forecast to warm slightly at the end of the
week and into the early part of the weekend. But beyond that, both
the GFS and ECMWF ensemble means indicate that an upper trough
will be centered along the west coast, which will likely mean
cooler than normal temperatures late in the weekend and into the
first part of next week.

Aviation As of 10:45 pm pdt Sunday... The strong north-south
component of the onshore gradient has kept stratus out of sfo so
far this evening but satellite image shows it is expanding inside
the bay. Therefore look for low clouds to spread over sfo bay
overnight. Ft ord profiler shows the marine layer is trending
lower so the cloud bases will be in the ifr range. The clouds
should also burn off earlier on Monday. As an upper level ridge
builds into the pacific northwest Monday night the flow above the
inversion will become more offshore. This will bring drier air
down to the surface resulting in less clouds for Monday night.

Vicinity of ksfo... Ifr CIGS after 06z with bases 800-1000 feet.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS clearing after 18z at sns and
19z at mry.

Marine As of 10:40 pm pdt Sunday... High pressure off the
pacific northwest will keep the strongest winds over the northern
outer waters through next week.

Mtr watches warnings advisories
Tday Sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 pm
public forecast: dykema
aviation: W pi
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi54 min S 8.9 54°F 1010 hPa
46237 - San Francisco Bar, CA (142) 11 mi71 min 56°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi31 min NNW 9.7 G 14 54°F 56°F1010.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi116 min WNW 6 56°F 1009 hPa52°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 mi48 minSW 410.00 miOvercast59°F52°F78%1009.9 hPa
San Francisco, San Francisco International Airport, CA15 mi45 minS 510.00 miA Few Clouds56°F48°F77%1009.8 hPa
Hayward, Hayward Air Terminal, CA21 mi47 minN 010.00 miOvercast58°F53°F84%1010.7 hPa
Half Moon Bay Airport, CA22 mi46 minSSE 84.00 miFog/Mist54°F50°F88%1010.8 hPa
Concord, Buchanan Field, CA23 mi48 minno data10.00 miFair58°F50°F75%1007.4 hPa
Novato / Gnoss Field, CA23 mi46 minN 010.00 miFair52°F51°F100%1009.8 hPa

Wind History from SFO (wind in knots)
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Last 24hrW7SW8W9SW8SW8W9W11W12W13W14W19W16W20W19W15W12W12W105W8W4S5SW5S5
1 day agoSW10W8W7SW7SW9SW11W14W12W11W15W15SW15W16SW15W15W11SW14SW11W9SW10SW8W8SW9W7
2 days agoW7W12W11SW11W8W11W12W12W15W14W15W17W22W17W16W15W12W13
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Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Mon -- 01:31 AM PDT     Full Moon
Mon -- 05:47 AM PDT     Sunrise
Mon -- 06:08 AM PDT     Moonset
Mon -- 06:40 AM PDT     -1.15 feet Low Tide
Mon -- 01:54 PM PDT     4.68 feet High Tide
Mon -- 06:23 PM PDT     2.71 feet Low Tide
Mon -- 08:34 PM PDT     Sunset
Mon -- 09:07 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.35.84.731.2-0.2-1-1.1-0.60.31.42.63.74.44.74.43.83.12.72.83.344.95.7

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Mon -- 01:14 AM PDT     -0.01 knots Slack
Mon -- 01:31 AM PDT     Full Moon
Mon -- 04:28 AM PDT     -3.15 knots Max Ebb
Mon -- 05:47 AM PDT     Sunrise
Mon -- 06:08 AM PDT     Moonset
Mon -- 08:08 AM PDT     0.00 knots Slack
Mon -- 11:21 AM PDT     3.33 knots Max Flood
Mon -- 02:55 PM PDT     -0.00 knots Slack
Mon -- 05:05 PM PDT     -1.41 knots Max Ebb
Mon -- 07:59 PM PDT     0.01 knots Slack
Mon -- 08:34 PM PDT     Sunset
Mon -- 09:07 PM PDT     Moonrise
Mon -- 10:50 PM PDT     2.24 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.50.3-1.1-2.4-3.1-3.1-2.5-1.6-0.21.52.73.33.22.61.4-0.1-1.1-1.4-1.2-0.801.122.2

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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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.