Monday, March27, 2017 L-36.com


Marine Weather and Tides
Piedmont, 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 6:58AMSunset 7:29PM Monday March 27, 2017 5:48 AM PDT (12:48 UTC) Moonrise 5:59AMMoonset 6:17PM 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 254 Am Pdt Mon Mar 27 2017
.small craft advisory in effect from noon pdt today through this evening...
Today..NW winds 5 to 15 kt increasing to 15 to 25 kt this afternoon.
Tonight..NW winds 15 to 25 kt in the evening decreasing to 5 to 15 kt after midnight.
Tue..W winds 5 to 15 kt.
Tue night..NW winds 5 to 15 kt.
Wed..W winds 5 to 15 kt.
Thu..NW winds 10 to 20 kt.
Fri..N winds 10 to 20 kt.
PZZ500 254 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 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.

7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 270948
afdmtr
area forecast discussion
national weather service san francisco bay area
248 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 2:45 am pdt Monday... 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 10:31 pm pdt Sunday... For 06z tafs. Weak front
is now moving east of the area with -shra activity quickly winding
down. Winds are switching NW and drier air is filtering in.

Question is what will be left in terms of low clouds for the early
morning hours. Best guidance currently suggests any morning cigs
should quickly mix out with strong boundary layer winds and drying
airmass.

Vicinity of ksfo... Northwest winds have arrive and rain should now
be done for the night. MVFR CIGS forecast to mix out by 16z.

Medium confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Showers quickly moving eastward.

Lingering boundary layer moisture and MVFR CIGS should mix out by
15-16z Monday.

Marine As of 9:00 pm pdt Sunday... Winds will continue to
switch to the northwest overnight as a weak cold front passes
through the waters. Northwest winds will increase Monday afternoon
through Tuesday as a strong surface pressure gradient sets up
across the region. At the same time a building northwest swell
will pass through the waters but become messy in the near shore
waters due to the strong winds. 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 from 6 am
sca... Mry bay from 12 pm
sca... Sf bay from 12 pm
public forecast: dykema
aviation: rww
marine: rww
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi48 min NW 6 G 12 54°F 1021.1 hPa (+1.2)
OBXC1 7 mi48 min 55°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi48 min NW 8 G 13
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi48 min NW 12 G 14 54°F 1021.1 hPa (+1.0)
AAMC1 - 9414750 - Alameda, CA 7 mi48 min NW 5.1 G 8 54°F 59°F1021.5 hPa (+1.2)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi48 min WNW 6 G 8 54°F 1021.3 hPa (+1.0)
PXSC1 10 mi48 min 53°F 46°F
RCMC1 - 9414863 - Richmond, CA 11 mi48 min NW 8.9 G 13 53°F 57°F1020.8 hPa (+1.3)
FTPC1 - 9414290 - San Francisco, CA 13 mi48 min W 6 G 8 52°F 56°F1021.5 hPa (+1.1)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi48 min NW 8.9 G 14 53°F 1020.9 hPa (+1.2)
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi48 min W 13 G 16 53°F 57°F1021 hPa (+1.2)49°F
UPBC1 14 mi48 min WNW 12 G 16
PCOC1 - 9415144 - Port Chicago, CA 17 mi48 min W 16 G 18 53°F 56°F1020.6 hPa (+1.1)
46237 - San Francisco Bar, CA (142) 22 mi48 min 55°F6 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi48 min WNW 8 G 12 52°F 1020.5 hPa (+1.1)
RTYC1 - 9414523 - Redwood City, CA 24 mi48 min W 7 G 8 53°F 60°F1020.8 hPa (+0.9)
SFXC1 - San Francisco Bay Reserve, CA 26 mi63 min NW 8 48°F 1020 hPa47°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi58 min NNW 16 G 19 54°F 55°F6 ft1021.2 hPa (+1.3)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi58 min NW 16 G 19 55°F 55°F6 ft1020.9 hPa (+0.7)

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi55 minWNW 1010.00 miA Few Clouds54°F48°F80%1021.1 hPa
Concord, Buchanan Field, CA13 mi55 minWSW 510.00 miA Few Clouds49°F46°F90%1019.5 hPa
Hayward, Hayward Air Terminal, CA14 mi54 minNW 510.00 miFair53°F43°F69%1022 hPa
San Francisco, San Francisco International Airport, CA18 mi52 minNW 710.00 miMostly Cloudy53°F46°F80%1021.2 hPa
San Carlos Airport, CA22 mi53 minW 510.00 miA Few Clouds50°F46°F88%1021.3 hPa
Livermore, Livermore Municipal Airport, CA24 mi55 minWSW 710.00 miA Few Clouds47°F44°F90%1020.4 hPa

Wind History from OAK (wind in knots)
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Last 24hrSW5W5SW4SW4SE6SE8S9SE8S7S6S4S3SW16SW12SW14SW17W15W13W11W14W14W11NW9W10
1 day agoN4NW5N3CalmNW7W10NW7W7W11W13W10W13W14W14W16W14W12W11W8W8W6W7SW6SW4
2 days agoE10SE11SE15
G23
SE18S19S18SE19SE22
G29
SE14SE14SE13SE10S6SE5N4CalmCalmE3SE5CalmN3NW7NW4NW4

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Berkeley
Click for Map
Mon -- 12:18 AM PDT     5.58 feet High Tide
Mon -- 06:13 AM PDT     0.86 feet Low Tide
Mon -- 06:59 AM PDT     Moonrise
Mon -- 07:01 AM PDT     Sunrise
Mon -- 12:19 PM PDT     5.81 feet High Tide
Mon -- 06:30 PM PDT     0.17 feet Low Tide
Mon -- 07:17 PM PDT     Moonset
Mon -- 07:28 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
5.55.44.73.52.31.30.91.11.834.25.25.85.74.93.62.10.90.30.312.13.44.7

Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Mon -- 12:13 AM PDT     -0.01 knots Slack
Mon -- 02:49 AM PDT     -1.24 knots Max Ebb
Mon -- 06:14 AM PDT     0.01 knots Slack
Mon -- 06:59 AM PDT     Moonrise
Mon -- 07:01 AM PDT     Sunrise
Mon -- 09:22 AM PDT     1.15 knots Max Flood
Mon -- 12:22 PM PDT     -0.00 knots Slack
Mon -- 03:08 PM PDT     -1.38 knots Max Ebb
Mon -- 06:36 PM PDT     0.00 knots Slack
Mon -- 07:17 PM PDT     Moonset
Mon -- 07:27 PM PDT     Sunset
Mon -- 07:59 PM PDT     New Moon
Mon -- 09:45 PM PDT     1.19 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.1-0.5-1.1-1.2-1-0.6-0.10.40.91.11.10.80.2-0.5-1.1-1.4-1.2-0.9-0.40.20.71.11.21

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 (8,2,3,4)
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Ground Weather Radar Station Sacramento, 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.