Sunday, September23, 2018 L-36.com


Marine Weather and Tides
Menlo Park, CA

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:56AMSunset 7:04PM Sunday September 23, 2018 6:57 PM PDT (01:57 UTC) Moonrise 5:47PMMoonset 4:26AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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 The San Francisco Bay North Of The Bay Bridge- 146 Pm Pdt Sun Sep 23 2018
.small craft advisory in effect until 9 pm pdt this evening...
Rest of today..SW winds 10 to 20 kt with gusts up to 35 kt.
Tonight..SW winds 5 to 15 kt.
Mon..SW winds 5 to 15 kt with gusts up to 25 kt.
Mon night..SW winds 5 to 15 kt.
Tue..SW winds 5 to 15 kt with gusts up to 25 kt.
Tue night..SW winds 5 to 15 kt with gusts up to 25 kt.
Wed..SW winds 5 to 15 kt with gusts up to 25 kt.
Thu..W winds 5 to 15 kt.
PZZ500 146 Pm Pdt Sun Sep 23 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate, locally gusty northwest winds across the coastal waters through the remainder of the day, especially north of point reyes and south of point sur as wellas in the outer waters. Locally steep fresh swell will be generated by these gusty winds. Winds subside by tomorrow morning through the coming days.


7 Day Forecast for Marine Location Near Menlo Park, CA
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location: 37.52, -122.16     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 232327
afdmtr
area forecast discussion
national weather service san francisco bay area
427 pm pdt Sun sep 23 2018

Synopsis High pressure will begin to build over the region
through the first part of the week and result in a warming, drying
trend. This will will bring dry offshore winds at times and
increased fire weather concerns, especially for the north bay
hills tonight into Tuesday. Temperatures are forecast to cool late
in the week with the potential for unsettled weather conditions
during the upcoming weekend.

Discussion As of 01:50 pm pdt Sunday... Breezy onshore flow
early this afternoon has allowed for cool conditions to prevail at
the coast despite the lack of cloud cover. Only low clouds patchy
fog being reported is along highway 1 from monterey up to the
aptos area and along the southern big sur coastline. With
temperatures in the 50s and 60s at the coast, inland areas have
already warmed into the 70s and 80s for the most part. Looking the
rest of today to feel very autumn like with a few degrees of
additional warming under a mainly clear sky.

As the passing mid upper level short-wave trough shifts inland
tonight, upper level ridging will begin to build off of the pacific
northwest coast and over northern california. This will allow for
weak offshore flow to develop over the interior and in the higher
elevations across the region ushering in a warmer, drier air mass.

Meanwhile, a weak marine layer is likely to persist along the coast
and allow for some stratus to return along coastal areas. The
warming and drying conditions will be most noted in the next 12 to
48 hours in the hills higher elevations of the north and east bay
regions which will result in near critical fire weather conditions.

Additional information can be found in the fire weather discussion
below.

The ridge of high pressure will continue to build through late week
with weak offshore flow at times. This will allow for the interior
to see afternoon temperatures back into the 80s and 90s by Wednesday
with coastal locations in the 70s to lower 80s (locations such as
santa cruz). By midweek, the marine layer may also become well mixed
enough to prevent widespread stratus develop during the overnight
and early morning hours. While daytime temperatures will warm to
above seasonal averages, overnight lows will be allowed to cool
decently given the long autumn nights. Thus, heat risks will remain
low to moderate for just about all major urban areas.

A rex block mid upper level pattern is forecast to develop well off
of the west coast late in the week as an upper level low begins to
undercut the ridge of high pressure. As this occurs, the air mass
aloft will begin to cool and allow for a cooling trend across the
region Thursday into Friday with an increase in onshore winds. The
marine layer may also rebound and allow for low level clouds to
return to the coast late in the week. Both the GFS and ecmwf
generate some precipitation at least across northern california and
as far south as the north bay. Confidence remains low at this time
for any measurable precipitation, at least for any widespread
rainfall. However, the models do hint at a continued cool, unsettled
pattern over the region heading into the first of october. Something
we will need to keep an eye on in the coming days.

Aviation As of 04:27 pm pdt Sunday... For 00z tafs. Satellite
imagery showing mainly clear skies across the region with some
passing high clouds.VFR through the evening with patchy ifr cigs
around the sf and monterey bay area TAF sites tonight. Patchy
dense fog will possible in the early morning in the north bay and
around the monterey bay. Onshore winds will diminish in the
overnight hours before picking up again tomorrow afternoon.

Low confidence on timing and extent of stratus redevelopment.

Vicinity of ksfo...VFR. Gusty winds will continue into the early
evening. May see some brief low CIGS in the early morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR through the early evening. Early
return of low CIGS tonight, with patchy dense fog developing late
tonight into early tomorrow morning.

Fire weather As of 10:00 am pdt Sunday... The fire weather
watch has been cancelled for the north bay mountains which was
previously in effect from 11 pm tonight through Tuesday afternoon.

However, dry northerly winds remain forecast to develop over this
region, especially over napa county, during this timeframe. This
will drive humidity levels lower through Tuesday afternoon with
overnight recoveries only in the 20-25% range. Afternoon humidity
values may fall into the single digits to lower teens Monday and
Tuesday, yet wind speeds are forecast to remain below red flag
criteria.

Precautions should still be taken as fuels remain critically dry
and any localized gusty winds in the ridges peaks could result
in an elevated fire weather risk.

Marine As of 01:46 pm pdt Sunday... Moderate, locally gusty
northwest winds across the coastal waters through the remainder of
the day, especially north of point reyes and south of point sur
as well as in the outer waters. Locally steep fresh swell will be
generated by these gusty winds. Winds subside by tomorrow morning
through the coming days.

Mtr watches warnings advisories
Tday Sca... Sf bay
sca... Mry bay
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rgass
aviation: as
marine: drp
fire weather: rgass dykema
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi39 min 66°F 70°F1010.8 hPa
AAMC1 - 9414750 - Alameda, CA 19 mi45 min 61°F 66°F1011.1 hPa
LNDC1 20 mi39 min 63°F 1010.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi69 min WSW 11 G 12
OKXC1 - 9414776 - Oakland (Berth 34), CA 22 mi39 min 62°F 1010.8 hPa
OBXC1 22 mi39 min 62°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi39 min 60°F 1009.8 hPa
PXSC1 23 mi45 min 61°F 53°F
FTPC1 - 9414290 - San Francisco, CA 26 mi45 min 58°F 60°F1010.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi39 min 60°F 1010.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi46 min Calm 64°F 1010 hPa
RCMC1 - 9414863 - Richmond, CA 31 mi45 min 62°F 63°F1010.2 hPa
46237 - San Francisco Bar, CA (142) 31 mi57 min 59°F5 ft
MZXC1 - 9415102 - Martinez-Amorco CA 36 mi39 min 74°F 67°F1009.4 hPa52°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi39 min 68°F 1009.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi39 min 75°F 68°F1009.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 39 mi37 min WNW 12 G 16 56°F 1011.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi39 min 76°F 1008.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi72 min W 8 78°F 1009 hPa48°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA3 mi70 minNNW 1510.00 miClear0°F0°F%1010.8 hPa
San Carlos Airport, CA5 mi67 minW 910.00 miClear73°F41°F31%1010.5 hPa
Mountain View, Moffett Field, CA9 mi2 hrsNNW 1110.00 miFair71°F52°F51%1011.1 hPa
Hayward, Hayward Air Terminal, CA10 mi63 minW 1010.00 miFair67°F53°F61%1011.6 hPa
San Francisco, San Francisco International Airport, CA13 mi61 minWNW 1510.00 miA Few Clouds62°F50°F65%1010.4 hPa
Oakland, Metro Oakland International Airport, CA13 mi64 minWNW 1210.00 miA Few Clouds64°F53°F68%1011.1 hPa
San Jose, San Jose International Airport, CA16 mi64 minNNW 810.00 miA Few Clouds74°F48°F40%1010.4 hPa
Half Moon Bay Airport, CA18 mi62 minWNW 65.00 miFair with Haze57°F53°F88%1012.2 hPa
San Jose / Reid / Hillv, CA22 mi2.2 hrsNNW 910.00 miPartly Cloudy81°F51°F37%1009.8 hPa
Livermore, Livermore Municipal Airport, CA22 mi64 minW 1010.00 miFair79°F28°F16%1009.4 hPa

Wind History from PAO (wind in knots)
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Last 24hrNW8Calm--------------------CalmCalmN6N5N8------N17N17N15NW12
1 day ago--NW9--------------------CalmCalm----N7N10N10--NW12NW10NW10NW13
2 days ago--NW5------------------Calm----4--N8----NW15NW15
G22
NW13NW14--

Tide / Current Tables for Redwood Creek, C.M. No.8, San Francisco Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (21,6,7,8)
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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.