Wednesday, January23, 2019 L-36.com


Marine Weather and Tides
Portola Valley, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:16AMSunset 5:24PM Wednesday January 23, 2019 10:04 AM PST (18:04 UTC) Moonrise 8:42PMMoonset 9:20AM Illumination 92% Phase: Waning Gibbous; Moon at 18 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- 828 Am Pst Wed Jan 23 2019
Today..N winds 5 to 15 kt...becoming nw 15 to 20 kt with gusts up to 25 kt this afternoon. Wind waves 2 ft or less...becoming 3 to 4 ft this afternoon. W swell 3 to 7 ft at 16 seconds.
Tonight..N winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 ft or less. W swell 6 to 8 ft at 15 seconds.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 7 to 8 ft at 16 seconds.
Thu night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 4 to 7 ft at 18 seconds.
Fri..N winds 5 to 15 kt. Wind waves 2 ft or less. W swell 5 to 7 ft at 17 seconds.
Fri night..N winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 6 to 7 ft at 16 seconds.
Sat..E winds up to 10 kt. Wind waves 2 ft or less. W swell 4 to 6 ft.
Sun..N winds 5 to 10 kt. Wind waves 2 ft or less. W swell 5 to 6 ft.
PZZ500 828 Am Pst Wed Jan 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will generate moderate to locally gusty northerly winds across the coastal waters through much of the week. A series of small to moderate northwest swells are forecast throughout the week.


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 231717
afdmtr
area forecast discussion
national weather service san francisco bay area
917 am pst Wed jan 23 2019

Synopsis Building high pressure along the west coast will
result in a gradual warming trend through Saturday, along with
mainly clear skies. The dry weather pattern will likely last
through the end of the month, with a continuation of seasonably
mild days and cool nights.

Discussion As of 09:06 am pst Wednesday... The ongoing forecast
in the short-term remains on track and no updates are anticipated
at this time. Please see the previous forecast discussion for
additional details.

Prev discussion As of 2:42 am pst Wednesday... Upper level high
pressure continues to build off the west coast. Latest overnight
satellite imagery shows a few high clouds spilling over the
periphery of the ridge. Despite a few high clouds spilling into
far norcal, much of the bay area is mostly clear. Clear skies and
relatively light winds will lead to a chilly morning. For what
it's worth the latest 24 hour trend does indicate many locations
are currently running cooler than 24 hours ago - mid 30s to 40s.

Given the clear skies and light winds temperatures are likely to
drop a few more degrees through shortly after sunrise patchy frost
is possible.

The upper level ridge is forecast to remain over the region and
ultimately strengthen moving inland this weekend. There is a
brief ripple late in the week with a weak inside slider, but the
next result locally is offshore flow. Therefore, the rest of the
work week and next weekend will be rather quiet weather wise.

Clear skies and dry conditions will prevail. Temperatures will
gradually warm through the period and peak Friday-Sunday with
periods offshore flow. Temperatures will warmer to above seasonal
levels with highs in the 60s and 70s. Overnight lows on the other
hand will remain cool to chilly with clear skies and light winds.

The question is, when will it rain next? The 00z operational runs
of both the ECMWF and GFS keep the bay area dry through 240 hours
(feb 1). However, some of the ensemble guidance gives a 25% chance
of 0.01" at ksfo around feb 1 or 2. Needless to say the extended
forecast will need some watching, but confidence does seem pretty
high that the region will remain dry through then end of january.

Aviation As of 9:18 am pst Wednesday... For 18z tafs. High
pressure will maintain mainly clear skies across area terminals
with the exception of a few high clouds. Generally light winds
will prevail through the forecast period.

Vicinity of ksfo...VFR conditions will prevail through the period
with only a few high clouds expected. Light to locally variable winds
will persist.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR conditions and light winds will
prevail through the period.

Marine As of 8:28 am pst Wednesday... High pressure over the
eastern pacific will generate moderate to locally gusty northerly
winds across the coastal waters through much of the week. A series
of small to moderate northwest swells are forecast throughout the
week.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm from 3 pm
sca... Pt arena to pt reyes 0-10 nm from 1 pm
sca... Pt pinos to pt piedras blancas 0-10 nm from 1 pm
public forecast: rgass
aviation: sims
marine: sims
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi34 min ESE 2.9 G 4.1 47°F 54°F1031.5 hPa
AAMC1 - 9414750 - Alameda, CA 29 mi34 min Calm G 1.9 51°F 54°F1031.3 hPa
LNDC1 30 mi34 min Calm G 1 49°F 1030.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi34 min WNW 5.1 G 6
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi34 min NNW 5.1 G 6 47°F 1030.2 hPa
OBXC1 31 mi34 min 48°F 43°F
PXSC1 32 mi82 min 48°F 45°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi34 min NW 4.1 G 5.1 47°F 1031.1 hPa
FTPC1 - 9414290 - San Francisco, CA 33 mi34 min NNE 7 G 8.9 48°F 54°F1031.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi34 min N 2.9 G 6 50°F 1031.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi47 min NNW 7 46°F 1031 hPa
RCMC1 - 9414863 - Richmond, CA 40 mi34 min NNW 6 G 8.9 47°F 54°F1030.9 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi74 min E 7.8 G 9.7 53°F 56°F5 ft1029.7 hPa (+0.5)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi34 min E 1.9 G 3.9 54°F 55°F1031.7 hPa
46092 - MBM1 43 mi52 min NE 12 49°F 56°F1030 hPa (+0.8)
46114 - West Monterey Bay, CA 44 mi34 min 56°F5 ft
MLSC1 - Moss Landing, South Harbor, CA 45 mi30 min SE 7 G 20 47°F 1031.4 hPa35°F
ELXC1 - Elkhorn Slough Reserve, CA 46 mi79 min Calm 44°F 1030 hPa36°F
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi34 min E 1.9 G 4.1 47°F 51°F1031.7 hPa47°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi34 min E 8.9 G 11 48°F 1031 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi34 min ENE 5.1 G 6 44°F 51°F1031.6 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA10 mi77 minN 010.00 miClear46°F39°F76%1032.5 hPa
Mountain View, Moffett Field, CA11 mi68 minN 010.00 miFair47°F37°F71%1031.5 hPa
San Carlos Airport, CA12 mi74 minN 010.00 miA Few Clouds45°F39°F81%1031.2 hPa
San Jose, San Jose International Airport, CA16 mi71 minN 010.00 miA Few Clouds46°F34°F63%1030.9 hPa
Half Moon Bay Airport, CA18 mi64 minN 05.00 miFair with Haze50°F41°F71%1030.5 hPa
San Francisco, San Francisco International Airport, CA19 mi68 minN 010.00 miA Few Clouds49°F43°F80%1030.8 hPa
Hayward, Hayward Air Terminal, CA22 mi70 minENE 310.00 miA Few Clouds48°F34°F58%1032.1 hPa
San Jose / Reid / Hillv, CA22 mi77 minN 010.00 miClear43°F35°F76%1030.5 hPa
Oakland, Metro Oakland International Airport, CA23 mi71 minENE 310.00 miA Few Clouds48°F39°F71%1031.4 hPa

Wind History from PAO (wind in knots)
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Last 24hrNW5NW8N6N6N5N5CalmCalmCalmCalmCalm------------------CalmCalmCalmCalm
1 day ago--N10--N9NW12NW10NW8W9W9--W5------------------445Calm
2 days ago----------W16NW8W18
G26
W10W105------------------CalmSW7W7NW12

Tide / Current Tables for Granite Rock, Redwood Creek, San Francisco Bay, California
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Granite Rock
Click for Map
Wed -- 02:34 AM PST     7.97 feet High Tide
Wed -- 07:18 AM PST     Sunrise
Wed -- 08:06 AM PST     2.33 feet Low Tide
Wed -- 09:19 AM PST     Moonset
Wed -- 01:36 PM PST     9.48 feet High Tide
Wed -- 05:22 PM PST     Sunset
Wed -- 08:41 PM PST     Moonrise
Wed -- 08:46 PM PST     -1.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.76.67.87.975.642.82.32.84.26.17.99.29.48.674.72.40.4-0.7-1-0.21.4

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
Click for Map
Wed -- 03:08 AM PST     -0.01 knots Slack
Wed -- 05:55 AM PST     -0.93 knots Max Ebb
Wed -- 07:18 AM PST     Sunrise
Wed -- 08:39 AM PST     0.00 knots Slack
Wed -- 09:19 AM PST     Moonset
Wed -- 11:43 AM PST     1.63 knots Max Flood
Wed -- 02:25 PM PST     -0.00 knots Slack
Wed -- 05:22 PM PST     Sunset
Wed -- 06:08 PM PST     -1.60 knots Max Ebb
Wed -- 08:41 PM PST     Moonrise
Wed -- 09:28 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.21.91.20.1-0.5-0.8-0.9-0.7-0.30.211.51.61.20.4-0.3-0.9-1.4-1.6-1.4-1-0.30.51.5

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 (13,3,4,5)
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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.