Sunday, April22, 2018 L-36.com


Marine Weather and Tides
Sunnyvale, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:20AMSunset 7:51PM Sunday April 22, 2018 11:10 AM PDT (18:10 UTC) Moonrise 11:17AMMoonset 12:57AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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- 812 Am Pdt Sun Apr 22 2018
Today..SW winds 5 to 15 kt.
Tonight..SW winds 5 to 15 kt.
Mon..SW winds 5 kt...increasing to 5 to 15 kt in the afternoon.
Mon night..SW winds 5 to 15 kt.
Tue..SW winds 5 to 15 kt.
Wed..SW winds 10 kt.
Thu..W winds 10 kt.
PZZ500 812 Am Pdt Sun Apr 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally gusty northwest winds will continue today across the waters as high pressure sits over the eastern pacific. Brisk winds will likely continue to generate steep wind waves and fresh swell resulting in choppy seas through the rest of today. Winds will gradually diminish tonight into tomorrow.

7 Day Forecast for Marine Location Near Sunnyvale, CA
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location: 37.42, -121.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221732
afdmtr
area forecast discussion
national weather service san francisco bay area
1032 am pdt Sun apr 22 2018

Synopsis High pressure over california will maintain dry
conditions, and warm temperatures inland, through Monday. Cooler
temperatures are expected by the middle of the week as a low
pressure system develops over the eastern pacific. This low may
bring showers to the region next weekend.

Discussion As of 9:10 am pdt Sunday... Quiet Sunday on tap for
the bay area with just some high clouds over the north bay and a
few areas of coastal fog stratus around monterey bay and san mateo
coastline. Did a minor grid update to account for fog burning off
with currently only half moon bay and monterey reporting any cloud
ceilings or reduction to vsbys.

Strong northerly gradient down the coast should keep skies mostly
clear north of the golden gate in terms of coastal cloudiness
while an inverted trough from pigeon point southward will allow
for lighter winds and more stratus production especially with sst
around 51-52 degrees. There are some 10 foot wave sets so use
caution if visiting area beaches today.

Start of the work week looks quiet weather wise with quasi-zonal
flow suggesting temps near or slightly below normal for late
april. Incoming but disorganized upper trough will increase
onshore flow by midweek with overall trend towards cooling to a
few degrees below normal with no hot weather in-site.

Upper low trajectory will then be main forecast question for late
week time frame and any shower chances. Will wait for 12z suite of
euro, GFS and gem before making any long range forecast
adjustments.

Prev discussion As of 3:00 am pdt Sunday... Early morning satellite
imagery indicates patchy low clouds have developed in coastal
areas overnight. Expect low clouds and fog to become somewhat
more widespread along the coast and into the salinas valley by
daybreak. Low clouds are expected to clear by late morning,
leaving mostly sunny skies for the balance of the day. A shortwave
trough currently moving into the pacific northwest and far
northern california is not expected to have a significant impact
on our weather today. However, the shortwave will weaken the
ridge over california and likely result in slightly cooler
temperatures today compared to Saturday. In any case, temperatures
today are expected to be 5 to 10 degrees warmer than normal.

By Monday, the upper ridge is forecast to rebuild over california
and offshore flow at 925 mb is expected to develop and bring
drier air into the boundary layer. These developments indicate the
potential for at least slight warming on Monday.

An upper trough currently in the gulf of alaska is forecast to dig
south over the next few days and form a cutoff low west of
california along 135w by Tuesday. The models agree that this low
will then move very slowly eastward towards the california coast
through the remainder of the week. The result will be a cooling
trend starting on Tuesday, with temperatures expected to cool
back down to near normal, or slightly below normal, by midweek.

The models agree that precipitation associated with the upper low
will remain offshore through at least Friday. But the models
diverge by next weekend. The ECMWF forecasts the low to track
inland near the ca or border on Saturday and then continue to move
steadily to the ene. Under the ECMWF solution, only the far
northern portion of our forecast area would have any potential for
rain. Initially, the GFS also tracks the low towards the ca or
border, but then forecasts the low to change direction and drop
southeast and into central california. The GFS solution would
result in widespread shower activity in our area on Friday night
and Saturday, with showers potentially continuing into next
Sunday. The canadian is similar to the gfs. Have introduced shower
chances to the for forecast Friday night and Saturday. But this
portion of the extended forecast is low confidence, as one would
expect with a cutoff low scenario during the spring months.

Aviation As of 10:32 am pdt Sunday... For 18z tafs. Satellite
imagery showing patchy coastal stratus beginning to dissipate.VFR
conditions expected before the redevelopment of low clouds and
possibly patchy fog in the north bay monterey bay tonight into
tomorrow morning. Generally light winds this morning turning
onshore this afternoon at 10-20 kt.

Vicinity of ksfo...VFR conditions to prevail through the period
with mainly high clouds. Light winds will continue this morning
before increasing to 10-20 kt this afternoon, with higher gusts
possible.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr lifr conditions remain at kmry this
morning. Stratus along the coast is finally beginning to show
signs of dissipating on visible satellite imagery. For now
expectingVFR conditions to develop over the next couple of hours,
taf may be amended as needed. Possible redevelopment of stratus
overnight tonight although timing is uncertain. Onshore winds this
afternoon 10-15 kt.

Marine As of 08:12 am pdt Sunday... Moderate to locally gusty
northwest winds will continue today across the waters as high
pressure sits over the eastern pacific. Brisk winds will likely
continue to generate steep wind waves and fresh swell resulting in
choppy seas through the rest of today. Winds will gradually
diminish tonight into tomorrow.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 3 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rww
aviation: as
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi40 min N 1.9 G 5.1 60°F 63°F1016.4 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi40 min W 4.1 G 5.1 61°F 63°F1016 hPa
LNDC1 30 mi40 min W 1.9 G 2.9 61°F 1015.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi40 min W 1.9 G 1.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi40 min NW 1.9 G 2.9 56°F 1015.9 hPa
OBXC1 33 mi40 min 57°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi40 min NNW 4.1 G 4.1 55°F 1015 hPa
PXSC1 34 mi40 min 56°F 53°F
FTPC1 - 9414290 - San Francisco, CA 37 mi40 min NW 1.9 G 1.9 55°F 54°F1016.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi46 min W 5.1 G 6 58°F 1016.2 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi40 min WNW 4.1 G 4.1 56°F 58°F1015.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi40 min Calm G 2.9 66°F 1015.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi40 min W 2.9 G 4.1 61°F 60°F1016 hPa58°F
46237 - San Francisco Bar, CA (142) 43 mi40 min 53°F7 ft
ELXC1 - Elkhorn Slough Reserve, CA 44 mi85 min W 5.1 54°F 1016 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 44 mi40 min WNW 5.1 G 7 64°F 60°F1015.8 hPa
46092 - MBM1 46 mi65 min NW 7.8 50°F 52°F1016.9 hPa (+1.1)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi40 min NNW 1.9 G 1.9 61°F 1015.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi80 min NNW 14 G 16 52°F 53°F11 ft1015.9 hPa (+0.0)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi80 min NNW 14 G 16 52°F 53°F10 ft1015.8 hPa (+0.0)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA4 mi14 minN 410.00 miFair65°F53°F66%1016.2 hPa
San Jose, San Jose International Airport, CA4 mi17 minVar 310.00 miPartly Cloudy67°F54°F63%1015.6 hPa
Palo Alto Airport, CA8 mi2.3 hrsNW 78.00 miClear0°F0°F%1016.3 hPa
San Jose / Reid / Hillv, CA10 mi83 minNNW 610.00 miA Few Clouds64°F53°F68%1015.2 hPa
San Carlos Airport, CA16 mi80 minNE 310.00 miClear61°F51°F72%1016.3 hPa
Hayward, Hayward Air Terminal, CA18 mi16 minW 310.00 miFair67°F51°F57%1016.3 hPa
Livermore, Livermore Municipal Airport, CA21 mi17 minN 010.00 miFair70°F53°F55%1015.3 hPa
Oakland, Metro Oakland International Airport, CA23 mi17 minW 78.00 miMostly Cloudy62°F53°F73%1015.8 hPa
San Francisco, San Francisco International Airport, CA24 mi14 minNE 410.00 miPartly Cloudy62°F52°F70%1015.7 hPa

Wind History from SJC (wind in knots)
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Last 24hrNW3CalmNW5NW8W5NW13W12W11NW9W5SW4SW3NW6W4W3NW5NW4CalmW4SE6SE4NW3NW53
1 day agoW7W10W10NW11NW12NW13NW14NW10W8NW8W3W5NW7NW3CalmCalmCalmCalmCalmCalmSE43CalmCalm
2 days agoNW4NW9NW13NW15NW14NW14NW15NW13NW10N5NW4CalmS3CalmCalmSE3SE3S3S4SE6SE4CalmCalmNW3

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Sun -- 01:19 AM PDT     2.66 feet Low Tide
Sun -- 01:56 AM PDT     Moonset
Sun -- 05:54 AM PDT     8.91 feet High Tide
Sun -- 06:23 AM PDT     Sunrise
Sun -- 12:17 PM PDT     Moonrise
Sun -- 02:08 PM PDT     -0.42 feet Low Tide
Sun -- 02:46 PM PDT     First Quarter
Sun -- 07:49 PM PDT     Sunset
Sun -- 08:29 PM PDT     7.77 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.22.734.46.48.28.98.67.66.14.32.51-0-0.4-01.234.96.67.67.775.8

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
Sun -- 01:14 AM PDT     0.00 knots Slack
Sun -- 01:56 AM PDT     Moonset
Sun -- 03:37 AM PDT     0.72 knots Max Flood
Sun -- 06:20 AM PDT     -0.00 knots Slack
Sun -- 06:23 AM PDT     Sunrise
Sun -- 11:14 AM PDT     -1.21 knots Max Ebb
Sun -- 12:17 PM PDT     Moonrise
Sun -- 02:09 PM PDT     0.01 knots Slack
Sun -- 02:46 PM PDT     First Quarter
Sun -- 05:04 PM PDT     1.28 knots Max Flood
Sun -- 07:50 PM PDT     Sunset
Sun -- 08:33 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.10.30.70.70.50.2-0.2-0.5-0.8-1.1-1.2-1.1-0.7-0.10.61.11.31.20.90.3-0.1-0.4-0.5

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 (14,3,4,5)
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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.