Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Los Altos Hills, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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 6:25AMSunset 7:59PM Saturday August 17, 2019 11:15 AM PDT (18:15 UTC) Moonrise 8:30PMMoonset 7:18AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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- 834 Am Pdt Sat Aug 17 2019
Today..W winds around 5 kt, increasing to 5 to 10 kt this afternoon. Wind waves 1 ft. NW swell 6 to 8 ft at 10 seconds.
Tonight..W winds 5 to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft at 10 seconds.
Sun..S winds 5 to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft at 10 seconds.
Sun night..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft at 9 seconds.
Mon..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 5 ft at 9 seconds.
Mon night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 4 to 5 ft at 9 seconds.
Tue..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft.
Wed..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 4 to 6 ft.
PZZ500 834 Am Pdt Sat Aug 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to gusty northwesterly winds will continue over the northern and outer waters into Sunday as high pressure remains over the eastern pacific. This high pressure will begin to weaken into Sunday before a strong low pressure center develops and approaches british columbia early next week. The persistent fetch produced by these systems will generate fresh short period swell that will propagate into the california coastal waters. This short period swell in combination with gusty winds will generate hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Los Altos Hills, CA
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location: 37.35, -122.18     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 171748
afdmtr
area forecast discussion
national weather service san francisco bay area
1048 am pdt Sat aug 17 2019

Synopsis Cooler temperatures today and tomorrow are driven by
a deeper marine layer and continued onshore flow. Conditions
remain dry and seasonal to start the work week. A warming trend
looks to begin midweek as high pressure starts to build in the
desert southwest again.

Discussion As of 08:30 am pdt Saturday... A deepening trough
extending southwestward from its central low over saskatchewan
continues to be the driving factor for the deepening marine layer
over the bay area and the persistent onshore flow. The fort ord
profiler currently lists a growing marine layer of over 2000 feet.

The onshore flow will keep the cooling trend lingering today and
tomorrow, providing relief even for inland locations from the heat
experienced earlier this week. The trough's orientation also
provides a very small chance at some light patchy drizzle overnight
Saturday and into Sunday morning for areas along the santa cruz and
big sur coasts.

Sunday into Monday, the trough shifts from a positive tilt to a
negative tilt, as lower pressure builds over the north pacific
ocean. Despite the change in trough orientation, dam heights over
the bay area will only increase slightly, giving confidence of
consistent dry and seasonal conditions. However, high pressure looks
to build again over texas, and deepening toward new mexico and arizona
by midweek. A ridge associated with this high pressure midweek
will likely provide the next warming trend for the bay area.

Prev discussion As of 3:08 am pdt Saturday... A solid 2000 foot
marine layer has returned to the coast with low clouds filling the
valleys of the central coast. Onshore breezes induced by a 2.5 mb
sfo to sac onshore gradient will continue to allow for more low
cloud formation through sunrise inside sf bay and up into the
north bay valleys. Upper low level pressure with a closed
circulation at 700 mb will drop to just west of the golden gate
later this afternoon. That should mean a slow burn off of the
stratus back to the coast through midday. A general cooling trend
continues, especially inland where locations that were around 100
could cool towards the low to mid 80s this afternoon. Closer to
the bay trends should be 4-8 degrees cooler with highs generally
in the 70s.

The upper trough axis stays positioned right over san francisco
tonight into Sunday. This should allow the marine layer to deepen
to at least 2500 feet and possibly deeper. Not surprisingly the
models portend a big push of stratus tonight into Sunday morning
with low clouds likely pushing out into the delta and possibly
bumping into the foothills. Given the deep marine layer, onshore
gradients and cool air aloft expect a slow burn off of stratus
inside sf bay Sunday with cool temperatures regionwide as the
inland valleys struggle to reach the low 80s.

Sunday should be the coolest day followed by a modest warming
trend early next week as high pressure slowly builds. However, the
pattern looks stagnant early next week. The main player will then
be another ridge building from the desert southwest that should
induce another warming trend by the middle of next week. Models
continue to augur some tropical activity west of baja by next
weekend that allows a broad 595 dm ridge to build over the west
coast and out into the pacific which suggests above normal temps
in the extended.

Aviation As of 10:45 am pdt Saturday...VFR conditions have
returned across much of the bay area with lingering MVFR ifr
ceilings holding on around the monterey bay terminals. Should see
improving conditions region-wide as low clouds dissipate and
scatter through the remainder of the morning. Onshore winds will
increase a bit and become locally gusty this afternoon and
evening. Latest thinking is that low clouds will make an early
return late this evening as the marine layer continues to deepen.

Timing of clearing on Sunday remains a bit more tricky as cold air
advection arriving from the north should help to mix out the
marine inversion. However, look for MVFR ifr ceilings to impact
most terminals overnight tonight through early Sunday morning.

Vicinity of ksfo...VFR. Onshore winds will increase and become
locally gusty through the afternoon. Low clouds potentially make
an early return late this evening and will likely linger into
Sunday morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr conditions linger this morning
given a decent onshore and a moist boundary layer. Should see
these clouds scatter out by early afternoon giving way toVFR
conditions. Modest onshore winds will also persist this afternoon
and into the early evening hours. MVFR ifr conditions return late
this evening and will likely persist into Sunday morning.

Marine As of 4:41 am pdt Saturday... Moderate to gusty
northwesterly winds will continue over the northern and outer
waters into Sunday as high pressure remains over the eastern
pacific. This high pressure will begin to weaken into Sunday
before a strong low pressure center develops and approaches
british columbia early next week. The persistent fetch produced by
these systems will generate fresh short period swell that will
propagate into the california coastal waters. This short period
swell in combination with gusty winds will generate hazardous seas
conditions, particularly for smaller vessels.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 pm
sca... Sf bay from 3 pm
public forecast: dk rww
aviation: rgass
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 11 mi46 min N 6 G 8 67°F 76°F1011.7 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi52 min S 2.9 G 4.1 65°F 70°F1011.7 hPa
LNDC1 31 mi46 min S 2.9 G 5.1 66°F 1011.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi46 min WSW 1.9 G 2.9
OBXC1 33 mi46 min 65°F 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi46 min NW 5.1 G 5.1 64°F 1011.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi46 min N 5.1 G 6 64°F 1010.1 hPa
FTPC1 - 9414290 - San Francisco, CA 35 mi52 min WSW 8.9 G 14 64°F 64°F1011.4 hPa
46237 - San Francisco Bar, CA (142) 39 mi46 min 59°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi35 min SW 7 62°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi46 min WSW 12 G 19 63°F 1011.4 hPa
RCMC1 - 9414863 - Richmond, CA 41 mi46 min 66°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi26 min W 5.8 G 5.8 60°F 61°F7 ft1012.8 hPa (+1.5)
46092 - MBM1 42 mi66 min S 12 57°F 58°F1013.4 hPa (+1.9)
MLSC1 - Moss Landing, South Harbor, CA 43 mi47 min WSW 9.9 G 27 58°F 1013.7 hPa57°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi91 min NW 8 61°F 1012 hPa58°F
46114 - West Monterey Bay, CA 44 mi16 min 61°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi26 min S 7.8 G 9.7 56°F 58°F6 ft1012.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi46 min W 12 G 16 68°F 72°F1010.3 hPa
UPBC1 48 mi46 min W 15 G 18
PCOC1 - 9415144 - Port Chicago, CA 49 mi46 min W 19 G 21 67°F 72°F1010.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 49 mi46 min W 12 G 18 63°F 1010.5 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA9 mi80 minWSW 410.00 miFair70°F55°F59%1011.2 hPa
Palo Alto Airport, CA10 mi89 minN 010.00 miClear66°F57°F73%1010.8 hPa
San Jose, San Jose International Airport, CA13 mi23 minSSE 1010.00 miA Few Clouds73°F55°F55%1011 hPa
San Carlos Airport, CA13 mi29 minVar 410.00 miClear70°F59°F69%1011.2 hPa
Half Moon Bay Airport, CA20 mi21 minS 16 G 216.00 miOvercast with Haze63°F57°F83%1012.5 hPa
San Francisco, San Francisco International Airport, CA21 mi80 minENE 610.00 miA Few Clouds70°F55°F61%1010.7 hPa
Hayward, Hayward Air Terminal, CA22 mi22 minWSW 810.00 miFair69°F55°F63%1012.1 hPa
Oakland, Metro Oakland International Airport, CA24 mi23 minSSW 610.00 miA Few Clouds70°F55°F61%1011.3 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Last 24hrE4N7NW9NW9N12NW11N11N10N11--NW5----CalmSE3--SE5S3SE4--SE5SE9SE11SW4
1 day agoN4N5N7NW10N9--N13NW8--NW5NW4W3--N3--CalmCalmW3--W3Calm--Calm3
2 days agoN6N7N8N8N9NW10N12N9N10N7W3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN5N6N4

Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
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Sat -- 02:15 AM PDT     8.17 feet High Tide
Sat -- 06:26 AM PDT     Sunrise
Sat -- 08:18 AM PDT     Moonset
Sat -- 09:31 AM PDT     0.18 feet Low Tide
Sat -- 03:13 PM PDT     7.22 feet High Tide
Sat -- 07:58 PM PDT     Sunset
Sat -- 09:30 PM PDT     Moonrise
Sat -- 09:54 PM PDT     2.42 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.77.38.17.96.85.33.72.31.10.30.31.2356.57.276.35.34.43.42.72.42.9

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
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Sat -- 02:30 AM PDT     -0.00 knots Slack
Sat -- 06:25 AM PDT     Sunrise
Sat -- 07:01 AM PDT     -1.30 knots Max Ebb
Sat -- 08:18 AM PDT     Moonset
Sat -- 09:40 AM PDT     0.01 knots Slack
Sat -- 12:18 PM PDT     1.37 knots Max Flood
Sat -- 03:35 PM PDT     -0.00 knots Slack
Sat -- 07:28 PM PDT     -0.87 knots Max Ebb
Sat -- 07:58 PM PDT     Sunset
Sat -- 09:30 PM PDT     Moonrise
Sat -- 09:41 PM PDT     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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1.10.80.3-0.2-0.6-1-1.2-1.3-1-0.50.311.31.310.4-0.1-0.5-0.7-0.9-0.8-0.40.20.8

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 (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.