Tuesday, October24, 2017 L-36.com


Marine Weather and Tides
Santa Clara, 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 6:19PM Tuesday October 24, 2017 4:18 AM PDT (11:18 UTC) Moonrise 10:46AMMoonset 8:59PM Illumination 19% Phase: Waxing Crescent; Moon at 4 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 Pigeon Point To Point Pinos To 10 Nm- 253 Am Pdt Tue Oct 24 2017
Today..N winds 10 kt. Wind waves 2 ft or less. NW swell 7 to 8 ft at 16 seconds.
Tonight..N winds 10 kt. Wind waves 2 ft or less. NW swell 6 to 8 ft at 14 seconds.
Wed..NW winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft at 14 seconds.
Wed night..NW winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 5 ft at 14 seconds.
Thu..NW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft at 14 seconds.
Fri..NW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft.
Sat..NW winds 10 kt. Wind waves 2 ft or less. NW swell 6 to 8 ft.
PZZ500 253 Am Pdt Tue Oct 24 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the pacific northwest is bringing light offshore winds to the coastal waters. Another high will build off the northern california coast Wednesday resulting in increasing northwest winds over the northern outer waters. A large long period northwest swell will arrive by the weekend.

7 Day Forecast for Marine Location Near Santa Clara, CA
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location: 37.38, -121.9     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 241013
afdmtr
area forecast discussion
national weather service san francisco bay area
313 am pdt Tue oct 24 2017

Synopsis Clear and hot this afternoon with near record breaking
heat possible. Slight cooling by Wednesday but continued warm and
dry through the end of the work week and into the weekend.

Discussion As of 3:13 am pdt Tuesday... The sfo-wmc gradient is
currently around 15 mb offshore with some breezy east winds in
the hills. This has brought ideal downslope conditions to portion
of the east bay shoreline and even around half moon bay with
middle of the night temps hovering in the low 80s. Its an unusual
set up where the hill sites aren't necessarily the warmest given
no marine layer. There's wild variation in temperatures with some
of the cooler wind protected valleys currently in the 40s while
50s and 60s are most common with plenty of the 70s and even the
aforementioned 80s at 3 am! So the stage is set for a rapid warm
up once the Sun comes up with gusty easterly winds through about
17z. Record highs today range from the upper 80s to mid 90s most
areas so we may see some records fall today. Even though its late
october the afternoon heat can cause health related issues with
sensitive populations so please hydrate and seek shade as
necessary.

It does look like today will be the hottest day (record to near
record) with "cooling" Wednesday back into the mid and upper 80s
for many areas. Basically on weds the easterly flow will diminish
and we'll lose some of the adiabatic compression but the general
wind flow will remain offshore so there will be little or no
marine influence once again.

The ECMWF had trouble running last night and dont have that for
long range guidance. The GFS keeps the ridge in place over ca
through at least the end of the work week so high confidence for
continued above normal temperatures and dry weather with high
pressure overhead.

By Sunday or Monday winds may become more onshore with a modest
cooling trend back towards seasonable temperatures. The canadian,
gfs and old ECMWF continue to advertise dry weather through
halloween and into early november.

Aviation As of 10:40 pm pdt Monday...VFR through the entire
period for all tafs due to an offshore flow in place. No cigs
forecast. Winds will generally be under 12 kt. High confidence.

Vicinity of ksfo...VFR through the period with no CIGS forecast.

Winds forecast to be under 10 kt. Direction will be variable at
first then mostly 280 to 310 after 19z. High confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR through the period with skc
conditions. Stronger winds near ksns with speeds over 10 kt
possible starting after 12z. Winds at kmry generally under 6kt.

High confidence.

Fire weather As of 3:13 am pdt Tuesday... Noting some gusty
offshore winds across the north and east bay hills early this
morning with northeast gusts to 43 mph last hour at the oakland
north raws. North bay raws are hovering around 80 with rh 22% and
gusts to 36 mph at hawkeye raws in NRN sonoma last hour. The
strong 15 mb gradient from the deserts will keep favorable
easterly flow in place through mid-morning before winds begin to
ease. Near record heat today will keep probability of ignition
high with low rh values and continued offshore wind flow. Today
looks like the most extreme day for fire weather parameters but
overall pattern of above normal temps, offshore winds, drying
fuels and low humidity values stays in place for much of this
week with little relief in sight.

Marine As of 3:13 am pdt Tuesday... High pressure over the
pacific northwest is bringing light offshore winds to the coastal
waters. Another high will build off the northern california coast
Wednesday resulting in increasing northwest winds over the
northern outer waters. A large long period northwest swell will
arrive by the weekend.

Mtr watches warnings advisories
Tday None.

Public forecast: rww
aviation: W pi
marine: W pi
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 19 mi48 min SSE 4.1 G 4.1 66°F 65°F1020.1 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi48 min SSW 1.9 G 2.9 67°F 62°F1020.9 hPa
LNDC1 35 mi48 min WSW 1.9 G 6 69°F 1020.3 hPa
OBXC1 37 mi48 min 70°F 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi48 min Calm G 1.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi48 min W 2.9 G 5.1 67°F 1020.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 39 mi48 min W 4.1 G 6 73°F 1019.4 hPa
PXSC1 39 mi48 min 74°F 52°F
ELXC1 - Elkhorn Slough Reserve, CA 40 mi93 min SSE 1.9 68°F 1019 hPa47°F
FTPC1 - 9414290 - San Francisco, CA 42 mi48 min NNE 11 G 13 70°F 58°F1020.5 hPa
46092 - MBM1 44 mi56 min ENE 16 63°F 55°F1018.6 hPa (-0.6)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi48 min NE 11 G 18 81°F 1020.6 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi48 min N 4.1 G 8.9 73°F 60°F1020.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi61 min WNW 5.1 71°F 1021 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 46 mi48 min SE 7 G 8 61°F 1021.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 47 mi48 min NNE 2.9 G 5.1 61°F 62°F1021.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi48 min SW 1 G 1.9 61°F 63°F1021.6 hPa59°F
46237 - San Francisco Bar, CA (142) 48 mi48 min 55°F7 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi88 min ENE 7.8 G 9.7 61°F 57°F10 ft1018.7 hPa (-0.8)

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, CA2 mi25 minN 010.00 miFair62°F51°F67%1020.4 hPa
Mountain View, Moffett Field, CA9 mi82 minN 010.00 miFair63°F55°F76%1020.9 hPa
San Carlos Airport, CA21 mi23 minSW 410.00 miFair63°F51°F68%1021 hPa
Livermore, Livermore Municipal Airport, CA23 mi25 minN 010.00 miFair58°F51°F78%1020.8 hPa
Hayward, Hayward Air Terminal, CA23 mi24 minN 010.00 miFair62°F51°F67%1021.5 hPa

Wind History from SJC (wind in knots)
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Last 24hrCalm33E4CalmW8NW8W9W10W12W12W11W11W7W5SW6CalmNE4CalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmNW6N65NW9NW12W11W9NW9NW9NW5CalmCalmE4SE3CalmE4NE4Calm
2 days agoSE3E3S3CalmCalmCalmNW6W8W12W9W12NW13NW8NW10NW12NW10NW8NW6CalmNE3CalmCalmCalmCalm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Tue -- 05:00 AM PDT     7.38 feet High Tide
Tue -- 07:25 AM PDT     Sunrise
Tue -- 11:06 AM PDT     2.83 feet Low Tide
Tue -- 11:45 AM PDT     Moonrise
Tue -- 03:42 PM PDT     8.71 feet High Tide
Tue -- 06:18 PM PDT     Sunset
Tue -- 09:59 PM PDT     Moonset
Tue -- 11:47 PM PDT     0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.72.245.76.97.47.16.25.143.22.83.34.86.78.38.78.37.35.84.22.51.30.5

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Tue -- 01:45 AM PDT     1.20 knots Max Flood
Tue -- 05:16 AM PDT     -0.01 knots Slack
Tue -- 07:25 AM PDT     Sunrise
Tue -- 08:53 AM PDT     -0.62 knots Max Ebb
Tue -- 11:05 AM PDT     0.00 knots Slack
Tue -- 11:46 AM PDT     Moonrise
Tue -- 01:31 PM PDT     0.74 knots Max Flood
Tue -- 04:15 PM PDT     -0.00 knots Slack
Tue -- 06:18 PM PDT     Sunset
Tue -- 09:04 PM PDT     -1.13 knots Max Ebb
Tue -- 09:59 PM PDT     Moonset
Tue -- 11:51 PM PDT     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.61.11.210.70.2-0.2-0.4-0.6-0.6-0.4-00.40.70.70.50.1-0.2-0.5-0.8-1-1.1-0.9-0.4

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 (7,2,3,4)
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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.