Monday, October23, 2017 L-36.com


Marine Weather and Tides
Foster City, CA

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:24AMSunset 6:22PM Sunday October 22, 2017 11:09 PM PDT (06:09 UTC) Moonrise 9:01AMMoonset 7:35PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 920 Pm Pdt Sun Oct 22 2017
Tonight..SW winds 10 kt.
Mon..NE winds 10 kt.
Mon night..N winds 10 kt.
Tue..NE winds 5 to 15 kt.
Tue night..W winds 10 kt.
Wed..N winds 5 to 15 kt...becoming w.
Thu..NW winds 5 to 10 kt.
Fri..N winds 5 to 10 kt...becoming w.
PZZ500 920 Pm Pdt Sun Oct 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong surface high pressure over the eastern pacific will build into the great basin early to mid week. Gusty northwesterly winds over the coastal waters will dissipate once the northerly pressure gradient relaxes which right now appears to be late Monday at the earliest. A strengthening offshore wind flow pattern will tend to push the california interior surface based thermal trough westward to the coastline, easing surface winds over most of the coastal waters to lighter speeds.

7 Day Forecast for Marine Location Near Foster City 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 230438
afdmtr
area forecast discussion
national weather service san francisco bay area
938 pm pdt Sun oct 22 2017

Synopsis Warm to hot temperatures are likely on Monday and
Tuesday afternoons. Along with the heat, dry conditions will
persist through the first half of the week as a result of weak
offshore winds. A gradual cooling trend is then forecast during
the second half of the week, yet temperatures will remain above
seasonal averages.

Discussion As of 8:53 pm pdt Sunday... No forecast updates this
evening. Skies are clear as dry offshore winds develop over the
region. Northerly gradient down the coast is 6.4 mb and building
while the sfo-wmc is currently only 5 mb and forecast to
strengthen significantly the next 24 hours. Ft ord profiler shows
persistent northeast wind flow through the boundary layer already.

Some of our sensors up in the hills still hovering around 70
degrees at this hour with mt diablo now picking up 35 mph
northerly wind gusts. Stage is set for a sunny and warm Monday and
likely even warmer on Tuesday. Records could be set or tied both
days across the region. Offshore flow may weaken some by Wednesday
but any cooling looks minor at best. Saving grace will be the dry
airmass and long autumn nights that should allow for natural air
conditioning and night time relief to cool down buildings.

West coast ridge looks to stay in place through the week and into
next weekend. Things looking dry through at least halloween.

Updated fire weather section below as well.

Prev discussion As of 01:47 pm pdt Sunday... High pressure continues
to build in over the region from the south and will strengthen
through midweek. As the air mass aloft warms, surface temperatures
will also increase with afternoon highs reaching 15 to 20 deg f
above seasonal averages on Monday and Tuesday. This combined with
weak offshore flow will result in temperatures reaching into the
80s at the coast with lower middle 90s inland. With this event,
the warmest temperatures are forecast to occur on Tuesday across
the central coast where the warmest and driest air mass will be in
place. Cannot rule out a few of the warmest inland areas such as
pinnacles national park reaching into the upper 90s.

Overall, winds are forecast to remain light for most urban locations
but may become breezy and locally gusty at times in the peaks and
ridges beginning tonight before gradually tapering off Monday night
into Tuesday. These conditions will raise fire weather concerns to
some extent, but rainfall late last week is providing some temporary
relief, at least initially. By the time conditions dry out late
Monday and Tuesday, wind speeds are forecast to be weaker.

Heat risks will also increase into the moderate category both Monday
and Tuesday afternoon, mainly from the santa cruz mountains southward
through the central coast. However, longer nights and modest
overnight cooling under clear skies will limit the overall heat
risks region-wide through this heat event. Thus, folks are urged to
remain vigilant and use extra caution during the peak heating of the
day through early this week.

The mid upper level ridge is then forecast to weaken and shift back
offshore by midweek in response to an upper level trough digging
southward across the great basin and central plains. This will allow
for a cooling trend from Wednesday through at least Friday, yet
temperatures are forecast to remain above seasonal averages. In
addition, medium to longer range models maintain dry weather
conditions and near to slightly above average temperatures heading
through the end of october.

Aviation As of 9:38 pm pdt Sunday... High confidenceVFR in
offshore flow through Monday night. Increasing air mass stability
under an amplifying mid to upper level thermal and height ridge
will result in surface winds tending to decouple from increasingly
gusty NE winds aloft in the bay area hills and mountains tonight
into Monday morning; low level wind shear is possible due to 925
mb NE winds reaching 25-35 knots based on NAM wrf output. Warming
due to large scale air mass compression is seen on the profiler
data from bodega bay to fort ord with shallow inversions based at
sea level to 500 feet.

Vicinity of ksfo...VFR. W-nw winds this evening shifting to light
ne tonight. Low level wind shear 06z-17z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Light e-se winds this evening into
Monday except SE winds becoming increasingly gusty in the salinas
valley very late tonight through Monday morning.

Fire weather As of 8:53 pm pdt Sunday... Watching for
developing northerly winds overnight. 00z koak sounding showed
inversion height around 3000 feet and currently think it will be
hard to get strong winds to mix below that. Mt diablo is currently
running sustained at around 33 mph at 3849 feet. Looked at
updated fuels and the 10 hour fine fuels are around 8-10% but
expected to climb overnight. Latest live dead large fuel analysis
shows fuel dryness took a pretty good plunge after the Thursday
night frontal rain event. Upshot is will be watching winds in the
hills closely tonight. Warm and dry weather Monday will be of
concern for possible new starts or continued mop-up operations of
incidents that are wrapping up. Little or no humidity recovery
Monday night into Tuesday morning with continued light to moderate
offshore winds, followed by near record breaking heat Tuesday
afternoon. Temps to stay above normal for much of this week with
dry conditions and continued periods of offshore winds. Long range
models remain dry through halloween and beyond.

Marine As of 9:26 pm pdt Sunday... Strong surface high pressure
over the eastern pacific will build into the great basin early to
mid week. Gusty northwesterly winds over the coastal waters will
dissipate once the northerly pressure gradient relaxes which right
now appears to be late Monday at the earliest. A strengthening
offshore wind flow pattern will tend to push the california
interior surface based thermal trough westward to the coastline,
easing surface winds over most of the coastal waters to lighter
speeds.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: rww
aviation marine: canepa
fire weather: rww
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi52 min SW 1.9 G 2.9 61°F 65°F1024.7 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi52 min NE 1 G 1.9 63°F 62°F1025.5 hPa
LNDC1 17 mi52 min NE 1 G 1 64°F 1025.1 hPa
OBXC1 18 mi52 min 63°F 56°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi52 min E 1 G 1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi52 min W 1.9 G 2.9 65°F 1024 hPa
PXSC1 19 mi52 min 64°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi52 min Calm G 1.9 61°F 1025.1 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi52 min S 1.9 G 2.9 59°F 58°F1025.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi52 min N 5.1 G 6 65°F 1025.3 hPa
46237 - San Francisco Bar, CA (142) 26 mi70 min 56°F7 ft
RCMC1 - 9414863 - Richmond, CA 27 mi58 min NW 1 G 1.9 62°F 60°F1025 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi52 min SW 2.9 G 2.9 60°F 62°F1025.4 hPa55°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi80 min NW 12 G 16 58°F 55°F9 ft1025 hPa (+0.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi52 min SSE 2.9 G 4.1 62°F 1024.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi80 min NNW 18 G 21 60°F 60°F10 ft1024.3 hPa (+0.0)
PCOC1 - 9415144 - Port Chicago, CA 37 mi52 min SW 5.1 G 6 63°F 62°F1025 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi52 min WSW 1 G 2.9 64°F 1024.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi85 min Calm 55°F 1025 hPa53°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi75 minN 010.00 miFair61°F53°F77%1025.4 hPa
Palo Alto Airport, CA8 mi2.4 hrsVar 510.00 miClear59°F53°F82%1024.7 hPa
San Francisco, San Francisco International Airport, CA8 mi74 minN 010.00 miFair63°F51°F65%1025 hPa
Oakland, Metro Oakland International Airport, CA10 mi77 minN 010.00 miFair56°F53°F90%1025.1 hPa
Hayward, Hayward Air Terminal, CA10 mi76 minN 010.00 miFair61°F48°F63%1025.9 hPa
Mountain View, Moffett Field, CA13 mi74 minN 010.00 miFair62°F52°F70%1025.4 hPa
Half Moon Bay Airport, CA14 mi75 minNW 75.00 miFog/Mist55°F51°F88%1024 hPa
San Jose, San Jose International Airport, CA21 mi77 minN 010.00 miFair63°F55°F76%1024.9 hPa

Wind History from SQL (wind in knots)
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Last 24hrSW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN7NW6NW6NW5NW10NW7NW7NW8NW5CalmCalmS3Calm
1 day agoSW3W5NW5W4W3NW5W3CalmCalmCalmCalmNE4--NE6--NW6NW7--NW10W7W6W9NW8Calm
2 days agoS3NW12NW13
G17
W4NW4W6W4E3S3S3W4------NW12NW13W12W10
G17
W11--SW5W5W7W7

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
Click for Map
Mon -- 03:52 AM PDT     6.20 feet High Tide
Mon -- 07:25 AM PDT     Sunrise
Mon -- 09:27 AM PDT     2.65 feet Low Tide
Mon -- 10:54 AM PDT     Moonrise
Mon -- 02:49 PM PDT     7.35 feet High Tide
Mon -- 06:20 PM PDT     Sunset
Mon -- 09:15 PM PDT     Moonset
Mon -- 10:08 PM PDT     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.43.85.15.96.25.854.13.22.72.83.54.7677.3764.631.60.60.20.5

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Mon -- 01:09 AM PDT     1.63 knots Max Flood
Mon -- 04:51 AM PDT     -0.00 knots Slack
Mon -- 07:25 AM PDT     Sunrise
Mon -- 07:27 AM PDT     -0.95 knots Max Ebb
Mon -- 10:24 AM PDT     0.00 knots Slack
Mon -- 10:54 AM PDT     Moonrise
Mon -- 12:56 PM PDT     1.09 knots Max Flood
Mon -- 04:01 PM PDT     -0.00 knots Slack
Mon -- 06:20 PM PDT     Sunset
Mon -- 07:38 PM PDT     -1.61 knots Max Ebb
Mon -- 09:15 PM PDT     Moonset
Mon -- 11:05 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.61.51.20.6-0.1-0.6-0.9-0.9-0.6-0.20.30.91.10.90.60-0.5-1.1-1.5-1.6-1.2-0.7-0.1

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (2,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.