Friday, June23, 2017 L-36.com


Marine Weather and Tides
Portola Valley, CA

Version 3.4
What's New / NOTES
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 5:47AMSunset 8:34PM Friday June 23, 2017 6:51 AM PDT (13:51 UTC) Moonrise 4:36AMMoonset 7:14PM Illumination 0% Phase: New Moon; Moon at 29 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- 308 Am Pdt Fri Jun 23 2017
Today..S winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 4 to 5 ft at 10 seconds and S 3 ft at 14 seconds. Patchy fog in the morning.
Tonight..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds. Patchy fog after midnight.
Sat..W winds 10 kt...becoming nw 10 to 20 kt in the afternoon. Wind waves 2 ft or less...becoming 3 to 4 ft in the afternoon. NW swell 3 ft at 9 seconds. Patchy fog in the morning.
Sat night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 ft at 9 seconds.
Sun..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 ft at 8 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 ft.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 ft.
PZZ500 308 Am Pdt Fri Jun 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light southerly winds over the coastal waters today. Onshore winds increase later today and tonight through coastal gaps such as the golden gate gap and across the northern san francisco bay. Northwest winds return this weekend. Generally decreasing seas through the coming days.

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 231151
afdmtr
area forecast discussion
national weather service san francisco bay area
451 am pdt Fri jun 23 2017

Synopsis Cooling trend starts today for most areas as onshore
flow returns. The far interior valleys will remain seasonably
warm through this evening. The overall trend this weekend and into
next week will be a return to more seasonable temperatures along
with more extensive night and morning low clouds followed by sunny
afternoons.

Discussion As of 3:34 am pdt Friday... All signs point to a
significant cooling trend today and for the coastal valleys these
transitions are rarely gradual. The marine layer has deepened to
around 1200 feet around monterey bay and trending deeper with a
southerly surface wind component as the southerly wind reversal is
now approaching CAPE mendocino. 24 hour trends for the hills show
as much as 10-20 degrees of cooling at this hour due to a
deepening marine layer and onshore winds. The gradients from
arcata to sfo have gone flat while the sfo to sac is 3.3 mb
onshore at this early hour. Wind out in the delta are already
gusting to 25 kt as cooler marine air oozes inland. Given all
this will maintain the current heat advisories for some of the far
interior zones and hills. This is mainly being done for
consistency of message and lingering heat impacts for heat
sensitive populations. Its expected that any remaining heat
headlines for our office will be allowed to expire by 9 pm this
evening if not earlier.

Looking at the 06z NAM graphical and MOS output numbers confidence
is growing that the overall trend this weekend will be continued
cooling back to or even slightly below normal by Sunday afternoon.

In general it looks like a more normal summer time weather
pattern this weekend across the bay area with night and morning
low clouds pulling back to the coast and followed by clear and
warm afternoons.

Latest ECMWF keeps a zonal or slightly cyclonic flow aloft off the
coast for next week implying near normal temperatures with dry
weather forecast. Longer range solutions later next week or
towards the end of the month show more pronounced ridging with
potential for another round of weak offshore flow and associated
warming.

Aviation As of 4:55 am pdt Friday... For 12z tafs. Compressed
but relatively deeper marine layer offshore pushing further
inland this morning bringing vlifr-ifr CIGS to low lying areas
along the coast this morning. Expect to see further expansion of
marine stratus low clouds through the early morning hours before
retreating in the 17z hour. Winds generally light today, except
breezy onshore winds through coastal gaps, including near ksfo, by
this afternoon and evening.

Vicinity of ksfo... Stratus in the bay area will need to wrap
clockwise around the bay before reaching ksfo. More likely to see
low clouds near the bridge ksmb rather than the tower ksfo this
morning. Low confidence this morning with forecast counting on
vfr conditions at ksfo but possible impacts near bridge.

Sfo bridge approach... Similar to ksfo with higher chance of lifr-
ifr CIGS at bridge versus tower.

Monterey bay terminals... Vlifr to ifr CIGS through 17z hour. Early
return of low clouds stratus tonight. Generally light winds.

Marine As of 04:43 am pdt Friday... Generally light southerly
winds over the coastal waters today. Onshore winds increase later
today and tonight through coastal gaps such as the golden gate
gap and across the northern san francisco bay. Northwest winds
return this weekend. Generally decreasing seas through the coming
days.

Mtr watches warnings advisories
Tday Heat advisory... Caz510-511-517-518 til 9 pm
sca... Sf bay from 2 pm
public forecast: rww
aviation: drp
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi51 min WNW 4.1 G 5.1 62°F 75°F1010.8 hPa (+1.1)
AAMC1 - 9414750 - Alameda, CA 29 mi51 min N 4.1 G 6 58°F 66°F1012 hPa (+1.2)
LNDC1 30 mi51 min NNW 4.1 G 5.1 57°F 1011.5 hPa (+1.2)
OBXC1 31 mi51 min 56°F 56°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi51 min W 8.9 G 12
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi51 min WSW 8.9 G 13 55°F 1010.4 hPa (+1.2)
PXSC1 32 mi51 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi51 min WNW 8.9 G 11 56°F 1011.5 hPa (+1.1)
FTPC1 - 9414290 - San Francisco, CA 33 mi51 min SW 6 G 11 55°F 56°F1011.9 hPa (+1.2)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 35 mi61 min S 12 G 14 55°F 55°F7 ft1011 hPa (+1.1)
46237 - San Francisco Bar, CA (142) 36 mi51 min 55°F5 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi51 min SW 9.9 G 13 58°F 1011.6 hPa (+1.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi59 min NNW 1.9 56°F 1011 hPa (+1.0)
RCMC1 - 9414863 - Richmond, CA 40 mi51 min W 5.1 G 7 57°F 62°F1011.2 hPa (+1.1)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi61 min 56°F 55°F7 ft1011.8 hPa (+1.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi61 min S 9.7 G 9.7 55°F 55°F5 ft1011.8 hPa (+1.1)
46092 - MBM1 43 mi104 min ESE 5.8 54°F 55°F1011.1 hPa (+0.5)
46114 - West Monterey Bay, CA 44 mi51 min 55°F6 ft
ELXC1 - Elkhorn Slough Reserve, CA 46 mi66 min N 5.1 54°F 1011 hPa54°F
UPBC1 47 mi51 min WNW 13 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi51 min W 13 G 14 61°F 69°F1010.8 hPa (+1.3)59°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi51 min SW 13 G 16 58°F 1010.8 hPa (+1.3)
PCOC1 - 9415144 - Port Chicago, CA 49 mi51 min W 19 G 22 61°F 70°F1010.1 hPa (+1.3)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA11 mi55 minN 010.00 miMostly Cloudy63°F60°F90%1011.7 hPa
San Carlos Airport, CA12 mi56 minN 310.00 miOvercast61°F57°F88%1011.5 hPa
San Jose, San Jose International Airport, CA16 mi58 minSE 610.00 miA Few Clouds63°F55°F78%1011.1 hPa
San Francisco, San Francisco International Airport, CA19 mi55 minWNW 49.00 miOvercast59°F55°F87%1011.2 hPa
Hayward, Hayward Air Terminal, CA22 mi57 minNNW 510.00 miFair59°F53°F81%1012.1 hPa
Oakland, Metro Oakland International Airport, CA23 mi58 minN 610.00 miOvercast59°F57°F93%1011.4 hPa

Wind History from PAO (wind in knots)
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Last 24hr------------------CalmNW6--N7N8N8NW9NW10NW15N16--NW18--NW10NW15
1 day ago------------------N6N6NE6N5--N5N8NW8NW15NW13--N10N8NW8NW8
2 days ago------------------NW5NW8N8NE66NW8N9--NW12N16N17N15N18--NW13

Tide / Current Tables for Granite Rock, Redwood Creek, San Francisco Bay, California
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Granite Rock
Click for Map
Fri -- 05:36 AM PDT     Moonrise
Fri -- 05:48 AM PDT     Sunrise
Fri -- 07:03 AM PDT     -1.59 feet Low Tide
Fri -- 01:37 PM PDT     7.03 feet High Tide
Fri -- 06:47 PM PDT     2.27 feet Low Tide
Fri -- 07:32 PM PDT     New Moon
Fri -- 08:14 PM PDT     Moonset
Fri -- 08:33 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.89.17.45.12.60.4-1.1-1.6-1.10.2245.76.876.24.93.52.52.33.14.86.88.7

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
Click for Map
Fri -- 12:27 AM PDT     -0.00 knots Slack
Fri -- 04:13 AM PDT     -1.79 knots Max Ebb
Fri -- 05:35 AM PDT     Moonrise
Fri -- 05:48 AM PDT     Sunrise
Fri -- 07:38 AM PDT     0.01 knots Slack
Fri -- 10:52 AM PDT     2.36 knots Max Flood
Fri -- 02:05 PM PDT     -0.00 knots Slack
Fri -- 04:49 PM PDT     -0.91 knots Max Ebb
Fri -- 07:29 PM PDT     0.00 knots Slack
Fri -- 07:32 PM PDT     New Moon
Fri -- 08:13 PM PDT     Moonset
Fri -- 08:33 PM PDT     Sunset
Fri -- 10:34 PM PDT     1.78 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.5-0.3-1-1.5-1.8-1.6-1.2-0.50.41.52.22.421.30.1-0.5-0.8-0.9-0.7-0.30.41.21.71.7

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 (9,2,3,4)
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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.