Tuesday, July23, 2019 L-36.com


Marine Weather and Tides
Portola Valley, CA

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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 6:04AMSunset 8:25PM Tuesday July 23, 2019 6:33 AM PDT (13:33 UTC) Moonrise 11:23PMMoonset 11:18AM Illumination 61% Phase: Waning Gibbous; Moon at 21 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- 221 Am Pdt Tue Jul 23 2019
.small craft advisory in effect from 9 am pdt this morning through late tonight...
Today..NW winds 10 to 20 kt, increasing to 15 to 25 kt this afternoon. Wind waves 6 to 7 ft. Becoming S around 2 ft at 16 seconds this afternoon. Patchy fog this morning.
Tonight..NW winds 15 to 20 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. S swell around 2 ft at 16 seconds.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves around 6 ft. S swell around 2 ft at 15 seconds.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 6 to 7 ft. S swell around 2 ft at 15 seconds. Patchy fog.
Thu..NW winds 10 to 15 kt. Wind waves 5 to 6 ft. S swell 2 to 3 ft at 15 seconds.
Thu night..NW winds 5 to 10 kt. Wind waves 5 to 6 ft. S swell 2 to 3 ft at 15 seconds.
Fri..NW winds 10 to 15 kt. Wind waves 4 to 5 ft. S swell 2 to 3 ft.
Sat..NW winds 10 to 15 kt. Wind waves 6 to 7 ft. S swell around 2 ft.
PZZ500 221 Am Pdt Tue Jul 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy northwest winds will persist today across the coastal waters. Winds will increase becoming gusty tonight and Wednesday as high pressure builds into the pacific northwest and northern california. Light southerly swell coupled with short period wind waves will continue through 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 231144
afdmtr
area forecast discussion
national weather service san francisco bay area
444 am pdt Tue jul 23 2019

Synopsis Inland temperatures will warm to above seasonal
averages through the remainder of the week and into the upcoming
weekend as high pressure dominates the weather pattern. The
influence of a shallow marine layer and persistent onshore flow
will keep conditions seasonably mild near the coast.

Discussion As of 02:51 am pdt Tuesday... A shallow marine layer
at about 800 feet in depth has resulted in low clouds over much
of the monterey bay southward into the salinas valley. In
addition, patchy stratus can be see on goes-w satellite imagery
along the san francisco peninsula as well as offshore. These
clouds may fill in a bit through sunrise, yet will be less
widespread compared to previous mornings. In addition, mid- level
moisture rotating around the building mid upper level high
pressure over the desert southwest appears to have produced an
isolated high-based shower over far eastern portion of san benito
county, now moving across western fresno and merced counties.

Overall, expecting only a few sprinkles from this if any
precipitation is reaching the surface at all. Regardless, look for
mid high level clouds to continue to move over the interior
portion of the central coast through the morning.

The aforementioned mid upper level high pressure to our east will
continue to be the dominate weather feature across the southwestern
portion of the country through the remainder of the week. However,
the ridge is forecast to be suppressed slightly over northern
california today as an upper level trough just off of the british
columbia coast pushes into the pacific northwest. This will stall
the warming trend a bit today with some inland locations potentially
cooling by a few degrees. Regardless, look for widespread 80s and
90s across the interior while upper 60s to middle 70s will be common
near the coast.

The warming trend will continue on Wednesday as the ridge
strengthens over the region. Daytime temperatures will likely warm
to around 10 degrees above seasonal averages over the interior.

Meanwhile, a shallow marine layer and continued onshore flow will
maintain cooler conditions near the coast with periods of
night morning low clouds and patchy fog. Temperatures cool slightly
across inland areas Thursday and Friday, but will remain very warm.

Look for an increase in mid upper level clouds late in the week as
monsoon moisture advects across the region around the ridge over the
desert southwest. With this, will need to monitor for any potential
of high-based showers and or thunderstorms, mainly for Thursday
night.

Longer range guidance from both the ECMWF and gfs, as well as the
ensembles, indicate the ridge of high pressure will shift westward
and over southern california during the upcoming weekend. This will
likely result in additional warming with daytime temperatures
rebounding to above seasonal averages for much of the region. Thus,
will need to monitor for increased heat risks across the interior by
the weekend.

Aviation As of 4:44 am pdt Tuesday... The marine layer remains
compressed under large scale subsidence resulting in vlifr-ifr on
the coastline and into the salinas valley.VFR is still reported
at kmry, but tempo ifr remains in the forecast for a few hours
until 16z this morning. Inland it'sVFR. Similar to yesterday the
marine layer should scatter back to the coastline then return
locally inland tonight and Wednesday morning.

Vicinity of ksfo... Conditions remain favorable forVFR to prevail
through the forecast period. Onshore wind increases by early
afternoon with gusts up to 20 knots possibly a few higher gusts
up to 25 knots.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Vlifr-ifr then clearing is anticipated
around 17z this morning.VFR late morning into the afternoon then
vlifr-ifr returning this evening.

Marine As of 2:51 am pdt Tuesday... Breezy northwest winds will
persist today across the coastal waters. Winds will increase
becoming gusty tonight and Wednesday as high pressure builds into
the pacific northwest and northern california. Light southerly
swell coupled with short period wind waves will continue through
the week.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 9 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Mry bay from 9 am
sca... Sf bay from 3 pm
public forecast: rgass
aviation marine: canepa
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi46 min NNW 2.9 G 4.1 61°F 75°F1016.4 hPa
AAMC1 - 9414750 - Alameda, CA 29 mi52 min W 7 G 9.9 58°F 69°F1016.4 hPa
LNDC1 30 mi46 min WSW 6 G 8 58°F 1015.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi52 min SW 8.9 G 11
OBXC1 31 mi46 min 58°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi46 min WSW 7 G 12 56°F 1014.9 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi46 min WSW 6 G 7 58°F 1015.9 hPa
FTPC1 - 9414290 - San Francisco, CA 33 mi52 min SW 2.9 G 9.9 56°F 60°F1016.2 hPa
46237 - San Francisco Bar, CA (142) 36 mi34 min 59°F3 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi46 min S 12 G 15 58°F 1015.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi29 min Calm 57°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 40 mi46 min 64°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi44 min NNW 14 G 18 58°F 57°F4 ft1015.8 hPa (-0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi24 min NW 12 G 16 55°F 56°F1017 hPa
46092 - MBM1 43 mi81 min NNW 3.9 55°F 57°F1016.4 hPa (+0.3)
46114 - West Monterey Bay, CA 44 mi34 min 59°F4 ft
MLSC1 - Moss Landing, South Harbor, CA 45 mi23 min Calm G 2.9 54°F 1017 hPa54°F
ELXC1 - Elkhorn Slough Reserve, CA 46 mi49 min S 1.9 54°F 1016 hPa54°F
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi52 min WNW 14 G 17 61°F 69°F1014.4 hPa
UPBC1 47 mi46 min NW 11 G 13
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi46 min WSW 11 G 15 60°F 1014.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi46 min W 14 G 16 61°F 70°F1014.6 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA11 mi98 minN 010.00 miFair63°F55°F78%1015.9 hPa
San Jose, San Jose International Airport, CA16 mi41 minNW 310.00 miA Few Clouds61°F61°F100%1015.7 hPa
Half Moon Bay Airport, CA18 mi39 minNE 38.00 miOvercast55°F53°F94%1016.9 hPa
San Francisco, San Francisco International Airport, CA19 mi38 minWNW 1010.00 miA Few Clouds59°F53°F81%1015.7 hPa
Hayward, Hayward Air Terminal, CA22 mi40 minN 310.00 miFair59°F53°F81%1016.6 hPa
Oakland, Metro Oakland International Airport, CA23 mi41 minN 47.00 miA Few Clouds58°F53°F84%1015.9 hPa

Wind History from PAO (wind in knots)
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Last 24hr------------------W4NW4Calm4--4N9N10NW11N11NW13NW14N14N14N10
1 day ago------------------3----N4N4N7N9N10N13--NW10--N8N10NW8
2 days ago----------------------4N4N4N5N8N11N12N16N16NW13N13N10N10

Tide / Current Tables for Granite Rock, Redwood Creek, San Francisco Bay, California
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Granite Rock
Click for Map
Tue -- 12:05 AM PDT     2.64 feet Low Tide
Tue -- 05:00 AM PDT     6.18 feet High Tide
Tue -- 06:05 AM PDT     Sunrise
Tue -- 11:51 AM PDT     1.15 feet Low Tide
Tue -- 12:17 PM PDT     Moonset
Tue -- 06:18 PM PDT     7.42 feet High Tide
Tue -- 08:24 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.93.84.95.86.265.34.23.121.31.21.62.74.15.66.87.47.36.65.64.43.3

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
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Tue -- 12:29 AM PDT     0.00 knots Slack
Tue -- 03:17 AM PDT     0.88 knots Max Flood
Tue -- 05:56 AM PDT     -0.00 knots Slack
Tue -- 06:05 AM PDT     Sunrise
Tue -- 09:27 AM PDT     -0.87 knots Max Ebb
Tue -- 12:17 PM PDT     Moonset
Tue -- 12:26 PM PDT     0.00 knots Slack
Tue -- 03:46 PM PDT     1.24 knots Max Flood
Tue -- 06:56 PM PDT     -0.01 knots Slack
Tue -- 08:24 PM PDT     Sunset
Tue -- 10:06 PM PDT     -0.81 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.20.60.90.80.5-0-0.3-0.6-0.8-0.8-0.5-0.20.30.81.11.210.6-0-0.4-0.7-0.8-0.7

Weather Map and Satellite Images
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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (9,2,3,4)
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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.