Sunday, August19, 2018 L-36.com


Marine Weather and Tides
Foster City, CA

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What's New / NOTES
7/21/2018 Trying to make page Mobile Friendly

Sunrise 6:28AMSunset 7:56PM Sunday August 19, 2018 7:08 AM PDT (14:08 UTC) Moonrise 2:14PMMoonset 12:00AM Illumination 56% Phase: First Quarter Moon; Moon at 8 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 242 Am Pdt Sun Aug 19 2018
Today..NW winds 5 to 10 kt...increasing to 10 to 20 kt in the afternoon. Haze.
Tonight..W winds 10 to 20 kt...becoming nw 5 to 10 kt after midnight. Haze through the night.
Mon..W winds 10 to 20 kt. Haze in the morning.
Mon night..W winds 10 to 20 kt. Patchy fog after midnight.
Tue..W winds 5 to 15 kt.
Wed..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
PZZ500 242 Am Pdt Sun Aug 19 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A relatively weak pressure gradient will continue to produce light to moderate northwest winds through the remainder of the weekend and into early next week. Winds will also continue to be strongest over the northern outer waters through at least Monday afternoon. In addition, onshore westerly winds will be breezy through the golden gate gap and around angel island each afternoon through this time period as well. Light to moderate mixed northwest and southerly swell will persist through the rest of the weekend.


7 Day Forecast for Marine Location Near Foster City, CA
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location: 37.55, -122.24     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 191157
afdmtr
area forecast discussion
national weather service san francisco bay area
457 am pdt Sun aug 19 2018

Synopsis Warm conditions will persist inland today, although
temperatures are expected to be slightly cooler than yesterday. An
upper level trough will move into northern california by tonight
and bring cooler temperatures to our entire region during the
first half of the work week. Slight warming is then expected late
in the week.

Discussion As of 3:25 am pdt Sunday... Low clouds and fog
completely blanket coastal areas early this morning and have
also developed into many of the coastal valleys and around san
francisco bay. Coverage of marine layer clouds is somewhat more
extensive compared to the past few mornings due to a slight
increase in the depth of the marine layer (nearly 1200 feet deep
at fort ord) as well as slightly stronger onshore flow.

Water vapor satellite imagery shows a weak upper trough beginning
to push onshore along the coast of the pacific northwest. This
trough is forecast to sag southeast and into northern california
by late today which will likely further increase both onshore
flow and the depth of the marine layer. Thus, most of our area
should see slightly cooler temperatures today, with most cooling
expected in the coastal valleys. The inland valleys and hills
should remain mostly isolated from marine air influence today and
so those areas will continue to be very warm. Air quality in the
bay area is expected to be rather poor once again today given that
the hrrr smoke model indicates slightly greater near surface
smoke concentrations compared to yesterday.

The upper trough is forecast to deepen further across northern
california during the early part of the work week and the models
agree that temperatures will continue to cool through Tuesday. The
most significant cooling during the first half of this week is
projected to occur across the interior as marine air advances
farther inland each day. Inland highs by Tuesday are forecast to
be as much 10 degrees cooler than today. The GFS and ECMWF both
forecast daytime temperatures to cool to near normal or slightly
below normal across most of our region by Tuesday. The models have
been trending cooler and so daytime temperatures have been
adjusted downward in our forecast for the week ahead. Night and
morning low clouds are expected to become more widespread over the
next few mornings and areas near the ocean won't likely see much
afternoon Sun by Tuesday and Wednesday. Patchy night and morning
coastal drizzle is also likely starting tonight.

The upper trough is forecast to lift to the northeast by midweek
which should allow for modest warming late in the week. However,
longer range models agree that a longwave trough will develop near
the west coast by next weekend and then persist well into next
week. The 8-14 day outlook from the climate prediction center
indicates cooler than normal temperatures across much of the west
during the last week of august.

Aviation As of 4:57 am pdt Sunday... For 12z tafs. Fog product
shows stratus has once again infiltrated coastal and adjacent
valley locations early this morning, with ifr lifr (and even vlifr
at kmry) at these terminals, currently. The biggest concern
today, other than the morning stratus, will be slant range vsbys
and possibly minor reduced vsbys at the surface at some terminals.

Didn't make many changes to 06z TAF package, with respect to vsby
and cigs. Latest hrrr-smoke experimental forecast model still
shows smoke from the mendocino complex fire spreading southward
over the bay area today, into this afternoon. Nevertheless,
confidence is still not high how much mixing will occur and how
surface vsbys will be affected by the smoke, if at all. Ifr lifr
conditions are expected to return again this evening overnight at
coastal terminals. Light to moderate onshore winds anticipated
this afternoon and evening.

Vicinity of ksfo... Borderline ifr lifr conditions currently as
stratus has rolled in over the past hour. Clearing (vfr) expected
over the terminal by 16-17z. Hazy conditions likely through the
day, though not confident on just how much surface vsby will be
impacted. Moderate onshore winds this afternoon, with cigs
returning overnight tonight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Lifr vlifr through about 17-18z this
morning. Will monitor and amend tafs if necessary. Coastal
stratus and fog likely moving back in this evening. Generally
light to moderate onshore winds this afternoon.

Marine As of 2:42 am pdt Sunday... A relatively weak pressure
gradient will continue to produce light to moderate northwest
winds through the remainder of the weekend and into early next
week. Winds will also continue to be strongest over the northern
outer waters through at least Monday afternoon. In addition,
onshore westerly winds will be breezy through the golden gate gap
and around angel island each afternoon through this time period as
well. Light to moderate mixed northwest and southerly swell will
persist through the rest of the weekend.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm from 2 pm
public forecast: dykema
aviation: bam
marine: bam
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi39 min ENE 1 G 1.9 56°F 72°F1016 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi45 min W 5.1 G 8 56°F 68°F1015.6 hPa
LNDC1 17 mi39 min WNW 1 G 2.9 56°F 1015.4 hPa
OBXC1 18 mi39 min 56°F 56°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi39 min WNW 1 G 1.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi39 min WSW 6 G 9.9 55°F 1014.4 hPa
PXSC1 19 mi45 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi39 min WNW 4.1 G 5.1 56°F 1015.5 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi45 min SW 4.1 G 7 55°F 61°F1015.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi39 min SSW 8 G 11 57°F 1015.5 hPa
46237 - San Francisco Bar, CA (142) 26 mi69 min 58°F4 ft
RCMC1 - 9414863 - Richmond, CA 27 mi39 min 64°F
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi39 min WNW 16 G 18 69°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi29 min W 7.8 G 12 54°F 58°F1016.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi39 min WSW 9.9 G 14 57°F 1014.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 37 mi39 min W 21 G 25 58°F 69°F1014.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi79 min NW 9.7 G 12 57°F 60°F5 ft1015.7 hPa (-0.0)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi39 min WNW 16 G 21 60°F 1013 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi84 min W 8.9 56°F 1013 hPa52°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi69 minNW 410.00 miOvercast57°F53°F88%1015.2 hPa
San Francisco, San Francisco International Airport, CA8 mi73 minW 410.00 miOvercast54°F53°F97%1015.1 hPa
Oakland, Metro Oakland International Airport, CA10 mi76 minWNW 56.00 miFog/Mist56°F55°F97%1015.3 hPa
Hayward, Hayward Air Terminal, CA10 mi75 minN 46.00 miFog/Mist57°F53°F87%1016.1 hPa
Mountain View, Moffett Field, CA13 mi73 minN 08.00 miOvercast59°F57°F93%1015.5 hPa
Half Moon Bay Airport, CA14 mi69 minENE 51.25 miFog/Mist52°F51°F100%1015.9 hPa
San Jose, San Jose International Airport, CA21 mi76 minN 47.00 miOvercast59°F57°F93%1014.9 hPa

Wind History from SQL (wind in knots)
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Last 24hrCalm3N6N6N6N9N9NW9N8NE8W7N7N5N3N3NW3NE3CalmNW3NW5CalmNW4NW4NE3
1 day ago------------------N8N7N7N4N4CalmCalmCalmCalmNW3CalmNW4NW3CalmCalm
2 days agoW6N33N12N10
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NW8W13W14--W13NW9NW10NW8NW6NW6NW5NW4CalmS4S4

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
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Sun -- 12:49 AM PDT     Moonset
Sun -- 02:41 AM PDT     0.90 feet Low Tide
Sun -- 06:28 AM PDT     Sunrise
Sun -- 08:58 AM PDT     5.60 feet High Tide
Sun -- 02:21 PM PDT     2.66 feet Low Tide
Sun -- 03:13 PM PDT     Moonrise
Sun -- 07:56 PM PDT     Sunset
Sun -- 08:01 PM PDT     7.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.71.610.91.42.33.54.55.35.65.34.73.93.12.72.83.64.86.27.37.77.56.75.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Sun -- 12:49 AM PDT     Moonset
Sun -- 03:16 AM PDT     0.00 knots Slack
Sun -- 06:15 AM PDT     1.21 knots Max Flood
Sun -- 06:28 AM PDT     Sunrise
Sun -- 09:28 AM PDT     -0.00 knots Slack
Sun -- 12:01 PM PDT     -0.61 knots Max Ebb
Sun -- 03:10 PM PDT     0.00 knots Slack
Sun -- 03:13 PM PDT     Moonrise
Sun -- 05:52 PM PDT     0.96 knots Max Flood
Sun -- 07:56 PM PDT     Sunset
Sun -- 08:58 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.3-1.1-0.7-0.20.511.21.20.80.3-0.2-0.5-0.6-0.6-0.4-0.10.50.910.90.5-0-0.6-1.1

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 (10,2,3,4)
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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.