Monday, March27, 2017 L-36.com


Marine Weather and Tides
Portola Valley, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:57AMSunset 7:28PM Monday March 27, 2017 9:27 AM PDT (16:27 UTC) Moonrise 5:59AMMoonset 6:17PM Illumination 0% Phase: New Moon; Moon at 0 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- 820 Am Pdt Mon Mar 27 2017
.small craft advisory in effect from noon pdt today through Tuesday afternoon...
Today..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 6 to 8 ft at 11 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 9 to 11 ft at 11 seconds.
Tue..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft at 11 seconds.
Tue night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 9 to 11 ft at 13 seconds.
Wed..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft at 15 seconds.
Thu..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 8 to 9 ft.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 9 to 11 ft.
PZZ500 820 Am Pdt Mon Mar 27 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase this afternoon and persist through midweek as a strong surface pressure gradient builds over the region. In addition, a building northwest swell will move through the coastal waters through midweek. Moderate to gusty northwest winds will then likely continue through late 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 271450
afdmtr
area forecast discussion
national weather service san francisco bay area
750 am pdt Mon mar 27 2017

Synopsis Partly cloudy skies are forecast today along with
brisk northwest winds during the afternoon and evening. High
pressure will build over california through midweek, resulting in
dry weather and a warming trend through Wednesday. Slightly cooler
conditions are expected on Thursday as a weather system moves
into eastern california. That weather system will bring only a
slight chance of showers to the northern and eastern portions of
our area, and also result in blustery conditions near the coast
and in the hills by late Thursday. High pressure will redevelop
late in the week and result in warmer weather once again by the
weekend.

Discussion As of 7:45 am pdt Monday... Kmux shows that the last
few showers this morning have finally dissipated. Overall looks
very quiet for our weather today outside of breezy northwesterly
winds especially along the coast. Highs will mostly be in the 50s
to mid 60s. 12z NAM now in through Thursday continues to downplay
precipitation chances from the mid-week inside slider.

No major updates planned.

Previous discussion The weak frontal system that brought
light rain to much of our region Sunday afternoon and evening has
moved off to our east and south early this morning. Radar still
shows isolated light showers over our area, but all shower
activity is expected to end by daybreak as drier air continues to
move in from the northwest. That drier airmass is already
resulting in clearing in the north bay and this clearing trend is
expected to continue from north to south through this morning. By
afternoon, expect mostly sunny to partly cloudy skies in all
areas.

Surface high pressure will begin to build off the northern
california coast today and the resulting tightening pressure
gradients will generate brisk northwest winds along the coast
this afternoon. Local gusts up to 35 mph are possible in the
windier coastal locations from late afternoon through early
evening.

An upper level ridge is forecast to build over california during
the next few days, resulting in dry weather and a warming trend
through Wednesday. By Wednesday, high temperatures will be mostly
in the upper 60s and 70s, with a few lower 80s possible in
monterey and san benito counties.

Daytime temperatures on Thursday will cool by 5 to 10 degrees as
an inside slider type system drops inland to our east. The gfs
keeps all precipitation with this system to our north and east,
but the ECMWF tracks the system a bit farther to the west and
clips the northern and eastern fringes of our area with light
shower activity late Wednesday night and Thursday morning. Either
solution will result in blustery conditions in the hills and near
the coast by Thursday afternoon when locally strong northwest
winds develop. Northerly winds will ease near the coast by Friday,
but remain locally strong and gusty in the hills into Friday
night.

Upper level ridging is forecast to redevelop over california just
in time for the weekend, and current model projections indicate
dry and seasonably warm weather on both Saturday and Sunday.

Aviation As of 4:55 am pdt Monday for 12z tafs. Winds have
switched to the northwest overnight with a weak frontal passage.

ExpectVFR conditions to prevail after 16z. There are a few low
clouds around ksfo and kmry as of 11z, but not expecting there to
be significant impacts as the boundary layer continues to dry
through the day. West to northwest winds can be expected this
afternoon with possible gusts exceeding 25 kts in the afternoon.

Vicinity of ksfo... MVFR conditions early this morning with a few
low cloud decks. Expect ceilings to improve by 16z as drier air
continues to move in. West to northwest winds will become gusty
this afternoon in excess of 20 to 25 kts.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... A few low clouds continue to impact kmry
this morning with ceilings around 3000 ft. ExpectVFR conditions
by mid-morning with gusty west to northwest winds this afternoon,
notably at ksns.

Marine As of 04:47 am pdt Monday... Northwest winds will
increase this afternoon through at least Tuesday as a strong
surface pressure gradient builds across the region. At the same
time, a building northwest swell will pass through the waters.

Typical gusty spring time northwest winds will continue at least
through midweek and likely through Friday as the next weather
system will likely increase the surface pressure gradient once
again.

Mtr watches/warnings/advisories
Tday Sca... Pt arena to pt reyes 0-10 nm from 12 pm
sca... Pt reyes to pigeon pt 0-10 nm from 12 pm
sca... Pigeon pt to pt pinos 0-10 nm from 12 pm
sca... Pt arena to pigeon pt 10-60 nm from 12 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 12 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Mry bay from 12 pm
sca... Sf bay from 12 pm
public forecast: bell/dykema
aviation: rowe
marine: rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi40 min WNW 8 G 9.9 54°F 59°F1022.8 hPa
AAMC1 - 9414750 - Alameda, CA 29 mi40 min WNW 7 G 8.9 54°F 58°F1023.7 hPa
LNDC1 30 mi40 min NNW 7 G 9.9 53°F 1023.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi40 min NW 8 G 9.9
OBXC1 31 mi40 min 54°F 45°F
PXSC1 32 mi40 min 55°F 43°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi40 min NNW 8.9 G 13 54°F 1023.5 hPa
FTPC1 - 9414290 - San Francisco, CA 33 mi46 min W 8 G 11 55°F 56°F1023.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 35 mi38 min NW 16 G 19 55°F 55°F6 ft1023.1 hPa (+1.9)
46237 - San Francisco Bar, CA (142) 36 mi58 min 56°F6 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi40 min WNW 6 G 8 55°F 1023.5 hPa
RCMC1 - 9414863 - Richmond, CA 40 mi46 min NW 8 G 9.9 53°F 57°F1023 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi38 min 18 G 21 55°F 56°F6 ft1023.2 hPa (+2.1)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi38 min NNW 14 G 18 54°F 55°F7 ft1023.5 hPa (+2.0)
46092 - MBM1 43 mi79 min WNW 9.7 54°F 56°F1021.7 hPa (+1.5)
46114 - West Monterey Bay, CA 44 mi28 min 56°F7 ft
UPBC1 47 mi40 min WNW 11 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi40 min WNW 14 G 16 52°F 56°F1023 hPa47°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi40 min WNW 8 G 12 53°F 1022.7 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi40 min W 12 G 14 52°F 55°F1022.8 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA10 mi41 minW 1010.00 miA Few Clouds55°F48°F77%1023.4 hPa
Mountain View, Moffett Field, CA11 mi32 minW 610.00 miFair54°F46°F75%1023.7 hPa
San Carlos Airport, CA12 mi38 minWNW 810.00 miA Few Clouds55°F46°F72%1023.7 hPa
San Jose, San Jose International Airport, CA16 mi35 minWNW 79.00 miA Few Clouds54°F46°F75%1023.2 hPa
Half Moon Bay Airport, CA18 mi33 minNW 137.00 miFair54°F48°F82%1023.7 hPa
San Francisco, San Francisco International Airport, CA19 mi32 minWNW 1010.00 miA Few Clouds55°F45°F69%1023.5 hPa
San Jose / Reid / Hillv, CA22 mi41 minNNW 510.00 miMostly Cloudy54°F48°F82%1024 hPa
Hayward, Hayward Air Terminal, CA22 mi34 minWNW 1110.00 miA Few Clouds55°F44°F67%1023.9 hPa
Oakland, Metro Oakland International Airport, CA23 mi35 minNW 910.00 miA Few Clouds56°F46°F72%1023.4 hPa

Wind History from PAO (wind in knots)
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Last 24hr6SE9E8E8E9E85S10--SE6SE94------------------W7W8W10
1 day agoW8--NW10NW13N12NW12
G20
NW15N12NW12NW12W11NW10------------------CalmCalm5
2 days ago--SE15
G22
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--SE18SE12SE12E5E5SE5SE5E7------------------NW9NW9NW6

Tide / Current Tables for Granite Rock, Redwood Creek, San Francisco Bay, California
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Granite Rock
Click for Map
Mon -- 12:52 AM PDT     7.84 feet High Tide
Mon -- 06:58 AM PDT     Moonrise
Mon -- 07:01 AM PDT     Sunrise
Mon -- 07:06 AM PDT     0.90 feet Low Tide
Mon -- 12:53 PM PDT     8.16 feet High Tide
Mon -- 07:17 PM PDT     Moonset
Mon -- 07:23 PM PDT     0.18 feet Low Tide
Mon -- 07:27 PM PDT     Sunset
Mon -- 07:59 PM PDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.47.87.364.32.61.40.91.32.74.56.37.78.27.66.34.52.510.20.41.63.45.4

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
Click for Map
Mon -- 01:28 AM PDT     -0.00 knots Slack
Mon -- 04:37 AM PDT     -1.24 knots Max Ebb
Mon -- 06:58 AM PDT     Moonrise
Mon -- 07:00 AM PDT     Sunrise
Mon -- 07:37 AM PDT     0.01 knots Slack
Mon -- 10:42 AM PDT     1.91 knots Max Flood
Mon -- 01:37 PM PDT     -0.00 knots Slack
Mon -- 04:56 PM PDT     -1.38 knots Max Ebb
Mon -- 07:16 PM PDT     Moonset
Mon -- 07:27 PM PDT     Sunset
Mon -- 07:59 PM PDT     New Moon
Mon -- 07:59 PM PDT     0.00 knots Slack
Mon -- 11:05 PM PDT     1.99 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.40.5-0.3-0.8-1.2-1.2-0.9-0.40.31.21.81.91.50.7-0.2-0.8-1.2-1.4-1.1-0.600.91.72

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 (12,3,4,5)
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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.