Monday, October14, 2019 L-36.com


Marine Weather and Tides
Portola Valley, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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 7:14AMSunset 6:34PM Monday October 14, 2019 3:21 AM PDT (10:21 UTC) Moonrise 6:26PMMoonset 6:53AM 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 235 Am Pdt Mon Oct 14 2019
Today..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft at 10 seconds and sw around 2 ft at 15 seconds.
Tonight..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft at 10 seconds and sw around 2 ft at 17 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. Mixed swell nw 3 to 4 ft at 10 seconds and sw around 2 ft at 17 seconds.
Tue night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 17 seconds.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 17 seconds.
Wed night..NW winds 5 to 15 kt. Wind waves 4 to 5 ft. NW swell 5 to 7 ft at 14 seconds and sw around 2 ft at 16 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. NW swell 9 to 11 ft and sw around 2 ft.
Fri..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 5 to 6 ft. NW swell 10 to 12 ft and sw around 2 ft.
PZZ500 235 Am Pdt Mon Oct 14 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light northwest winds will prevail over the coastal waters through columbus day. Mixed seas will continue over the next few days with a light shorter period northwest swell and a light southerly swell. A larger northwest swell is forecast to arrive later this week with forerunners expected in the next couple days.


7 Day Forecast for Marine Location Near Portola Valley, CA
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location: 37.36, -122.23     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 140535
afdmtr
area forecast discussion
national weather service san francisco bay area
1035 pm pdt Sun oct 13 2019

Synopsis Little change is expected through Monday. Slight
warming is forecast for Tuesday prior to the arrival of a weak
system that may produce light rain in the north bay late Wednesday
and Wednesday night. Breezy conditions are expected after frontal
passage from late Wednesday through Thursday. Slightly warmer and
drier conditions are forecast from Friday on into next weekend,
along with moderate breezes at times.

Discussion As of 8:35 pm pdt Sunday... Evening water vapor
satellite imagery shows a weak upper trough currently aligned
along the west coast. This trough brought a slightly cooler
airmass into our area today, and also enhanced onshore flow. The
result was cooler temperatures across nearly our entire region.

Downtown san francisco's high of 62 today was 15 degrees cooler
than Saturday's high.

Little change is forecast as we move into columbus day. Patchy
night and morning low clouds will primarily be limited to coastal
areas and temperatures will remain close to seasonal averages.

A shortwave ridge will briefly build over california late tomorrow
and Tuesday, resulting in a slight warm-up on Tuesday.

A pacific weather system projected to move into the pacific
northwest around midweek is forecast to produce widespread
rainfall across western washington and oregon, as well as
northwest california. The southern end of a cold frontal rain
band may clip the north bay late Wednesday and Wednesday night,
although the likelihood of measurable rain south of northern
sonoma county is very low. The midweek system will cool our
temperatures slightly on Wednesday and Thursday.

Locally gusty post-frontal northwest winds are expected from late
Wednesday through Thursday, primarily in coastal areas where
gusts to 35 mph are possible along the north bay coast on
Thursday. These winds will coincide with higher relative humidity
which will lessen fire concerns. Northwest winds will then veer a
bit more to the north by the weekend, resulting in slight warming
and drying. However, winds are not currently expected to be
strong enough to raise significant fire weather concerns through
next weekend.

Aviation As of 10:35 pm pdt Sunday... For 06z tafs. Patchy low
clouds continue to develop along the coast with some inland
intrusion visible on satellite. Gradual deepening of the marine
layer and expansion of coastal stratus will bring patchy low
clouds to coastal terminals overnight. However, it may be one of
those night where the stratus moves in and out bringing tempo cigs
to the some terminals. Light and locally variable winds will
prevail overnight.

Vicinity of ksfo...VFR conditions will prevail through the
forecast period with patchy low clouds likely peeking through
coastal gaps early Monday morning. Light and locally variable
winds will prevail overnight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions will prevail through late
tonight. Patchy low clouds may bring temporary CIGS to area
terminals between 07z and 14z early Monday morning. Light
offshore or locally variable winds expected overnight.

Marine As of 8:59 pm pdt Sunday... Light to locally moderate
northwest winds will persist across the coastal waters with
locally breezy winds over the northern outer waters. Mixed seas
will continue through early this week with a light shorter period
northwest swell and a light southerly swell. Fresh wind generate
short period waves in combination with swells will produce locally
hazardous seas over portions of the outer waters beginning this
evening. A larger northwest swell will then arrive later this week
with forerunners expected in the next couple days.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
public forecast: dykema
aviation: cw
marine: as cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi51 min Calm G 1.9 51°F 67°F1013.5 hPa
AAMC1 - 9414750 - Alameda, CA 29 mi51 min W 2.9 G 4.1 55°F 63°F1013.3 hPa
LNDC1 30 mi51 min ESE 2.9 G 4.1 55°F 1012.8 hPa
OBXC1 31 mi51 min 55°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi51 min NW 1 G 4.1 54°F 1011.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi51 min W 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi51 min SSW 1 G 1.9 54°F 1012.8 hPa
PXSC1 32 mi51 min 55°F 54°F
FTPC1 - 9414290 - San Francisco, CA 33 mi51 min SW 2.9 G 6 54°F 57°F1013 hPa
46237 - San Francisco Bar, CA (142) 36 mi81 min 55°F4 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi51 min S 8.9 G 11 56°F 1013 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi58 min Calm 51°F 1012 hPa
RCMC1 - 9414863 - Richmond, CA 40 mi51 min SSE 1.9 G 4.1 54°F 60°F1012.7 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi91 min 7.8 G 9.7 55°F 59°F4 ft1012.6 hPa (+0.6)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi41 min W 3.9 G 5.8 55°F 55°F1012.9 hPa
46092 - MBM1 43 mi70 min WNW 5.8 54°F 58°F1012.7 hPa (+0.8)
46114 - West Monterey Bay, CA 44 mi51 min 58°F4 ft
MLSC1 - Moss Landing, South Harbor, CA 45 mi48 min ESE 2.9 G 8.9 54°F 1013.5 hPa50°F
ELXC1 - Elkhorn Slough Reserve, CA 46 mi96 min ESE 1.9 54°F 1011 hPa51°F
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi51 min W 5.1 G 7 55°F 64°F1012.5 hPa55°F
UPBC1 47 mi51 min WNW 7 G 8.9
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi51 min WSW 2.9 G 4.1 53°F 1012.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi51 min SSW 2.9 G 5.1 50°F 65°F1012.5 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA16 mi28 minSE 410.00 miFair48°F39°F74%1012.9 hPa
Half Moon Bay Airport, CA18 mi26 minENE 310.00 miOvercast50°F46°F88%1013.2 hPa
San Francisco, San Francisco International Airport, CA19 mi25 minN 010.00 miA Few Clouds54°F44°F69%1012.8 hPa
Hayward, Hayward Air Terminal, CA22 mi27 minNE 410.00 miFair49°F39°F71%1013.8 hPa
Oakland, Metro Oakland International Airport, CA23 mi28 minENE 310.00 miPartly Cloudy48°F45°F89%1013.1 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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Last 24hr------------------Calm------N6N7N10N8N7N11N11N11N10NW6W4
1 day ago------------------CalmCalm--------N6N7--NW7N7----NW4--
2 days ago------------------Calm--CalmCalm--N3CalmCalmN3----N6NW5CalmCalm

Tide / Current Tables for Granite Rock, Redwood Creek, San Francisco Bay, California
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Granite Rock
Click for Map
Mon -- 01:30 AM PDT     7.22 feet High Tide
Mon -- 07:15 AM PDT     Sunrise
Mon -- 07:37 AM PDT     1.52 feet Low Tide
Mon -- 07:53 AM PDT     Moonset
Mon -- 01:24 PM PDT     8.03 feet High Tide
Mon -- 06:33 PM PDT     Sunset
Mon -- 07:25 PM PDT     Moonrise
Mon -- 08:10 PM PDT     0.61 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.27.17.16.45.23.72.41.71.62.43.95.67.17.97.97.15.73.92.31.10.60.923.5

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
Click for Map
Mon -- 02:19 AM PDT     -0.00 knots Slack
Mon -- 05:21 AM PDT     -0.97 knots Max Ebb
Mon -- 07:15 AM PDT     Sunrise
Mon -- 07:52 AM PDT     Moonset
Mon -- 08:24 AM PDT     0.00 knots Slack
Mon -- 11:24 AM PDT     1.46 knots Max Flood
Mon -- 02:13 PM PDT     -0.00 knots Slack
Mon -- 05:37 PM PDT     -1.21 knots Max Ebb
Mon -- 06:32 PM PDT     Sunset
Mon -- 07:25 PM PDT     Moonrise
Mon -- 08:51 PM PDT     0.00 knots Slack
Mon -- 11:56 PM PDT     1.64 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.10.3-0.3-0.7-1-0.9-0.6-0.20.41.11.41.40.90.2-0.4-0.9-1.2-1.2-0.9-0.50.10.91.5

Weather Map
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wmap_P
GEOS 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 (6,6,7,8)
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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.