Thursday, April27, 2017 L-36.com


Marine Weather and Tides
Stanford, 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 6:15AMSunset 7:57PM Thursday April 27, 2017 9:53 AM PDT (16:53 UTC) Moonrise 6:31AMMoonset 8:35PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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
    EDIT      (on/off)   Help
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 839 Am Pdt Thu Apr 27 2017
Today..W winds 5 to 15 kt. Wind waves 1 to 3 ft.
Tonight..W winds 10 to 20 kt. Wind waves 2 to 4 ft.
Fri..NW winds 10 to 20 kt. Wind waves 2 to 4 ft.
Fri night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft.
Sat..W winds 10 kt. Wind waves 2 ft or less.
Sun..W winds 10 kt. Wind waves 2 ft or less.
Mon..W winds 10 kt. Wind waves 2 ft or less.
PZZ500 839 Am Pdt Thu Apr 27 2017
Synopsis for the central california coast and bays including Monterey bay national marine sanctuaries.. Increasing northwesterly winds will impact the coastal waters today and Friday as building high pressure tightens the pressure gradient. Some isolated gale force gusts will be possible offshore and near coastal points. Steep seas will develop in response to the winds and a fresh northwest swell will continue to impact the coastal waters through the weekend.

7 Day Forecast for Marine Location Near Stanford, CA
   Hourly   EDIT   Help
location: 37.45, -122.17     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 271610
afdmtr
area forecast discussion
national weather service san francisco bay area
issued by national weather service eureka ca
910 am pdt Thu apr 27 2017

Synopsis A mostly sunny but breezy but still seasonably cool
day is expected today. Continued breezy at times Friday, near the
coast and in the hills with a gradual warming trend. Winds will
ease by Saturday morning then clear and warm weather is forecast
over the weekend and into early next with no rain in the extended
forecast.

Discussion As of 9:00 am pdt Thursday... The previous discussion
below remains on track as an upper level ridge begins to build
over the western pacific leaving central california in northwest
flow aloft. Low level stratus and fog is gradually mixing out this
morning and should dissipate completely in the next hour or so.

Surface high pressure will strengthen under the building ridge
allowing for northerly winds to increase through the day today.

Wouldn't be surprised to see some gusts to 35 mph on the north and
east bay hills Friday morning as an offshore tight pressure
gradient develops. See the previous discussion below for more
details.

Prev discussion As of 3:39 am pdt Thursday... Still getting a
few tips of the rain bucket in the santa cruz mountains and hills
of monterey county with northwest post frontal onshore flow in
place. Low cloud product shows the north bay is nearly clear of
clouds now which is supported by a 5 mb arcata to sfo gradient,
which is the usual rule of thumb for scouring clouds out of the
north bay. Areas of clouds south of the golden gate should clear
by late morning with any morning coastal drizzle ending around 15z
or so.

Synoptic pattern today features cyclonic flow aloft with strong
onshore surface pressure gradients that will kick up strong
afternoon northwest winds along the coast and coastal hills,
keeping a chill in the air this afternoon.

Overnight as the main longwave trough digs over the great basin
the response along the california coast will be a developing
thermal trough at the surface which will push the winds to a more
north or northeast direction by Friday morning. This will bring
some 35 mph winds to the north and east bay hills Friday morning
and allow for some favorable downslope winds. So under clear
skies expect temperatures to warm well into the 70s to wind out
the work week.

Winds will ease for a time Friday afternoon, except right at the
beaches where north winds will continue. Then again Friday night
into Saturday another round of offshore winds will develop in the
hills. This time with a drier and warmer airmass in place. This
will set the stage for a magnificent Saturday morning to start out
the bay area weekend. If you get out early enough you'll almost
be able to smell the warmth as the offshore winds usher in a drier
airmass with no marine layer to speak of. Saturday should be the
warmest day so far this year for many locations with highs
climbing into the 80s for may of the inland valleys, especially in
the north and east bay where favorable downslope wind flow will
continue.

By Sunday the offshore winds will have eased but the stage will be
set for several days of ideal spring time weather with clear skies
and daytime highs generally in the 70s and 80s for much of the bay
area and likely even some near 90 degree readings for southern
monterey county.

The earliest it looks like the ridge will break down would be
around next Thursday. Will see if we get any stratus intrusions
before that but it looks like a real nice period of warm and dry
weather coming up for the region.

Aviation As of 04:30 am pdt Thursday... For 12z tafs. Currently
vfr to MVFR across all sites. Expecting remaining MVFR CIGS to
lift toVFR by late this morning. Increasing NW winds are expected
by this afternoon with gusts approaching 30 kt possible at sfo by
22z. Spotty drizzle possible at the more southern TAF sites early
this morning.

Vicinity of ksfo... Low CIGS overnight have begun to scatter.

Expecting conditions to remainVFR through the period. W-nw winds
are expected to increase by this afternoon with gusts up to 30 kt
possible. Winds should begin to decrease late tonight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr conditions overnight are beginning to
improve. Currently MVFR at mry and sns. Expecting CIGS to continue
to lift as the morning progresses.VFR conditions are expected to
prevail by about 19z. Slight possibility of light drizzle early
this morning.

Marine As of 09:00 am pdt Thursday... The forecast remains on
track this morning with high pressure taking over the weather
pattern. The pressure gradient will tighten across the waters in
response to building high pressure causing northerly winds to
increase over the next couple of days. Wind gusts as high as 25 to
30 kt will become more frequent today and Friday. Some isolated
gale force gusts will even be possible offshore and near coastal
points. Then fresh north winds will persist into the weekend. Seas
will become quite steep due to the winds and a mid period
westerly swell will continue to impact the waters through the
weekend. The existing small craft advisories will remain in
effect.

Mtr watches/warnings/advisories
Ca... None.

Pz... Small craft advisory until 9 pm pdt Friday for pzz540-545-560-
565-570-575.

Small craft advisory until 3 am pdt Friday for pzz535.

Short term... 99
long term... .99


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 5 mi53 min WNW 1 G 1 58°F 63°F1017.7 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi53 min NNW 4.1 G 8 57°F 61°F1018.3 hPa
LNDC1 25 mi53 min N 5.1 G 8 57°F 1017.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 26 mi53 min NNW 5.1 G 5.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 26 mi53 min N 2.9 G 4.1 56°F 1018 hPa
OBXC1 26 mi53 min 58°F 48°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 27 mi53 min N 1.9 G 2.9 56°F 1017 hPa
PXSC1 27 mi53 min 57°F 49°F
FTPC1 - 9414290 - San Francisco, CA 29 mi53 min Calm G 1 58°F 57°F1018.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 33 mi53 min N 8.9 G 11 59°F 1018.2 hPa
46237 - San Francisco Bar, CA (142) 34 mi53 min 56°F7 ft
RCMC1 - 9414863 - Richmond, CA 35 mi53 min NNW 1.9 G 2.9 56°F 58°F1017.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 38 mi63 min NW 21 G 27 55°F 53°F11 ft1017.9 hPa (+1.8)
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi53 min NW 7 G 8.9 55°F 59°F1017.9 hPa53°F
UPBC1 41 mi53 min WNW 7 G 8
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 41 mi63 min NNW 23 G 27 53°F 53°F8 ft1017.9 hPa (+1.1)
PCOC1 - 9415144 - Port Chicago, CA 42 mi53 min WSW 7 G 8.9 56°F 59°F1017.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi53 min WNW 4.1 G 5.1 57°F 1017.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi53 min WNW 8.9 G 11 60°F 1017.1 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi63 min 21 G 25 55°F 56°F10 ft1017.6 hPa (+0.4)
46092 - MBM1 49 mi106 min W 14 53°F 1016.5 hPa (+0.4)

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
Last
24hr
W8
W8
G11
W9
W13
W13
W13
W9
W10
G13
NW10
G15
W9
G12
W9
G16
W10
G15
W17
W15
G23
W14
G18
W12
W11
G16
W10
G14
W8
G11
W11
G14
W12
W7
W5
W1
1 day
ago
NW12
G16
W10
NW11
G15
NW11
G16
W16
NW14
G19
SW15
W13
G17
NW13
G17
W14
G20
W8
G12
NW4
G7
W4
G7
SW3
W6
W4
SW4
S3
SE3
SE4
W5
S1
NW1
W9
2 days
ago
W9
G12
W12
W11
G14
W13
G17
W12
G15
W13
G16
W14
G18
W11
W14
G17
W17
W15
W11
G15
W9
G14
W11
W8
G12
SW4
G9
W8
G11
SW6
G10
SW5
G8
W5
G10
W5
W5
G8
NW9
NW11
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA3 mi66 minVar 510.00 miMostly Cloudy57°F51°F82%1018.3 hPa
San Carlos Airport, CA7 mi63 minNNE 510.00 miMostly Cloudy57°F50°F77%1018.6 hPa
Mountain View, Moffett Field, CA7 mi57 minNNW 410.00 miFair57°F50°F78%1018.8 hPa
San Jose, San Jose International Airport, CA14 mi60 minN 010.00 miMostly Cloudy58°F48°F72%1018 hPa
San Francisco, San Francisco International Airport, CA15 mi57 minN 310.00 miMostly Cloudy59°F48°F69%1018.1 hPa
Hayward, Hayward Air Terminal, CA15 mi59 minNNW 310.00 miPartly Cloudy61°F48°F65%1018.9 hPa
Oakland, Metro Oakland International Airport, CA17 mi60 minNNE 510.00 miMostly Cloudy60°F51°F72%1018.2 hPa
Half Moon Bay Airport, CA18 mi58 minN 11 G 175.00 miFair with Haze55°F48°F77%1018.6 hPa
San Jose / Reid / Hillv, CA20 mi3.1 hrsN 010.00 miMostly Cloudy55°F51°F88%1018.3 hPa

Wind History from PAO (wind in knots)
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
Last 24hr--NE5554W15NW10NW15NW15NW12NW12W15------------------335
1 day agoNW14--NW14--NW13
G20
--NW10W15W17W17W10W6------------------CalmCalmCalm
2 days ago--W10W9W9NW10W10W10W12--NW15NW11NW12------------------CalmNW10NW10

Tide / Current Tables for Palo Alto Yacht Harbor, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Palo Alto Yacht Harbor
Click for Map
Thu -- 01:24 AM PDT     8.47 feet High Tide
Thu -- 06:17 AM PDT     Sunrise
Thu -- 07:30 AM PDT     Moonrise
Thu -- 09:00 AM PDT     -0.73 feet Low Tide
Thu -- 02:41 PM PDT     6.85 feet High Tide
Thu -- 07:55 PM PDT     Sunset
Thu -- 09:00 PM PDT     0.98 feet Low Tide
Thu -- 09:34 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.18.38.37.66.24.32.40.7-0.4-0.7-0.11.53.45.36.66.86.25.13.72.31.311.73.5

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Hwy Bridge
Click for Map
Thu -- 02:00 AM PDT     -0.01 knots Slack
Thu -- 05:37 AM PDT     -1.68 knots Max Ebb
Thu -- 06:17 AM PDT     Sunrise
Thu -- 07:30 AM PDT     Moonrise
Thu -- 08:49 AM PDT     0.00 knots Slack
Thu -- 12:01 PM PDT     2.28 knots Max Flood
Thu -- 03:13 PM PDT     -0.00 knots Slack
Thu -- 06:08 PM PDT     -1.09 knots Max Ebb
Thu -- 07:55 PM PDT     Sunset
Thu -- 08:52 PM PDT     0.00 knots Slack
Thu -- 09:34 PM PDT     Moonset
Thu -- 11:58 PM PDT     1.77 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.710-0.6-1.2-1.6-1.6-1.2-0.60.21.222.321.30.3-0.4-0.9-1.1-0.9-0.50.10.91.5

Weather Map and Satellite Images
       (on/off)   Help
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)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.