Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Walnut Creek, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 6:55AMSunset 7:06PM Thursday September 21, 2017 12:39 PM PDT (19:39 UTC) Moonrise 7:19AMMoonset 7:18PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 850 Am Pdt Thu Sep 21 2017
.small craft advisory in effect from 1 pm pdt this afternoon through this evening...
Today..NW winds 5 to 15 kt...becoming W 15 to 25 kt in the afternoon.
Tonight..W winds 15 to 25 kt...decreasing to 5 to 15 kt after midnight.
Fri..W winds 5 to 15 kt.
Fri night..W winds 10 to 20 kt.
Sat..W winds 5 to 15 kt.
Sun..N winds 10 kt...becoming w.
Mon..NE winds 5 to 15 kt...becoming w.
PZZ500 850 Am Pdt Thu Sep 21 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Increasing northwest winds today as a trough moves through the region. Winds subside slightly late tonight through the weekend. Northwest swell will continue to decrease through the coming days while steep wind waves continue through Friday.

7 Day Forecast for Marine Location Near Walnut Creek, CA
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location: 37.9, -122.05     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211800
afdmtr
area forecast discussion
national weather service san francisco bay area
1100 am pdt Thu sep 21 2017

Synopsis A cool, upper level trough will dominate the western
portion of the country through the workweek maintaining cooler
than average temperatures and breezy conditions. Aside from the
potential for isolated showers offshore or near the coast Thursday,
dry weather conditions will prevail. A gradual warming trend is
then expected to begin this weekend and persist into early next
week.

Discussion As of 8:41 am pdt Thursday... Water vapor satellite
imagery shows a cold front passing through central california and
continuing into nevada and idaho. In its wake, temperatures across
the san francisco bay area and central california coast are
generally in the 50s with a few readings in the middle 40s for
parts of the north bay, such as santa rosa and napa. The 24 hour
temperature change varies depending on location. For the monterey
bay area temperatures are generally running at or slightly warmer
than this time yesterday, whereas the san francisco bay area
temperatures are running about 5 to 10 degrees cooler. Go farther
north and temperatures are running even cooler with a 15 degree
change at napa. Expect mostly clear, dry, and cool conditions
across the region with afternoon highs in the 60s along the coast
and 70s for interior areas. The exception to the dry weather would
be the higher elevations of monterey county where locally patchy
drizzle is possible through mid morning. The cool weather won't
last much longer as temperatures will begin to rebound tomorrow
with the warming trending continuing through the weekend and into
early next week. The short-term grids remains on track and don't
anticipate any major changes to the forecast. For additional
details beyond today, please refer to the previous discussion
section.

Prev discussion As of 2:45 am pdt Thursday... A cold front passed
through the bay area on Wednesday bringing some light showers,
breezy conditions and cooler temperatures. The cold front is now
south of the forecast area, but continues to produce precipitation
across the sierra. Behind the front and rather robust upper level
trough is currently swinging through norcal. Latest satellite
imagery and radar both indicate showers over the coastal waters.

These showers are tracking mostly north to south. Model guidance
has not changed too much from previous runs regarding the shower
activity. Showers will continue early today, but remain offshore
with no impact to the land areas of the bay area region.

Do expect some clearing of clouds today, but temperatures will
remain cool as the upper trough moves through. Latest model runs
still show a cool airmass with 850mb temps in the 4-5 deg c range.

As a result, daytime highs will be in the 60s and 70s or about 5
to 10 deg below normal for late september. Overnight lows will be
chilly as well with the hills dropping into the upper 30s.

Additionally, hi-res models show some breezy winds today and
Friday. Gusts 30 to 40 mph along the coast and higher terrain
seems plausible.

Another pattern shift is forecast to develop this weekend and then
persisting into next week. In the wake of the upper trough high
pressure will build over the region this weekend. A noticeable
warming trend is forecast to develop this weekend and peak next
week. Widespread 80s to possibly mid 90s will be possible by early
next week. Pattern recognition and climatology also suggest
periods of north to offshore winds will possible this weekend and
next week. The offshore flow will further enhance any warming and
drying. Fire weather concerns may increase due to offshore flow
with hot and dry conditions.

Aviation As of 010:55 am pdt Thursday for 18z tafs...

postfrontal environment bringing well mixed marine layer and
widespreadVFR CIGS this morning. Unstable postfrontal airmass is
firing some shallow convection over the higher terrain over the
south bay, east bay, santa lucia mountains and santa cruz
mountains. A few sprinkles possible today in these areas if
convection deepens, however this is unlikely. Otherwise, breezy
onshore winds forecast today, with sust winds 10-20 kt, with peak
gusts 20 to 30 kt. Some high clouds will arrive late today. Dirty
feed of sct-bkn AOA 2000-4000 ft agl will bring intermittent MVFR
cigs in a window from 10-18z fri, depending on location. High
confidence for today, low confidence on exact details for tomorrow
mornings dirty feed.

Vicinity of ksfo...VFR. Sustained onshore winds 15 to 20 kt, gusts
25 to 30 kt. MVFR CIGS possible Fri morning from 12-17z with dirty
onshore feed as trough shifts through.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Shallow convection distant south
and east with few-sct at 3000 to 5000 ft agl. Breezy onshore winds
10 to 15 kt with gusts up to 20kt possible, locally stronger along
the immediate coastline. Intermittent MVFR CIGS posbl 12 to 18z
fri W sct-bkn from 2000-4000 ft.

Marine As of 10:48 am pdt Thursday... Increasing northwest winds
today as a trough moves through the region. Winds subside slightly
late tonight through the weekend. Northwest swell will continue to
decrease through the coming days while steep wind waves continue
through Friday.

Mtr watches warnings advisories
Tday Sca... Mry bay
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay from 1 pm
public forecast: rowe mm
aviation: drp
marine: drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi51 min WNW 8 G 9.9 61°F 67°F1012.7 hPa45°F
PCOC1 - 9415144 - Port Chicago, CA 11 mi51 min W 6 G 8.9 62°F 68°F1012.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi51 min WNW 8 G 11 64°F 1011.9 hPa
LNDC1 14 mi51 min WNW 6 G 8 63°F 1012.6 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi51 min WNW 2.9 G 4.1 62°F 1012.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi51 min NW 5.1 G 6
AAMC1 - 9414750 - Alameda, CA 16 mi51 min WNW 4.1 G 8 64°F 67°F1013 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi51 min WSW 4.1 G 7 63°F 1012.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi51 min NW 5.1 G 8.9 67°F 1012.8 hPa
OBXC1 17 mi51 min 62°F 45°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi51 min N 4.1 G 5.1 61°F 1011.5 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi51 min NNW 5.1 G 7 63°F 65°F1012.3 hPa
PXSC1 20 mi51 min 62°F 46°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi114 min W 7 64°F 1012 hPa47°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi72 min NNE 7 63°F 1013 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi57 min WSW 8.9 G 14 61°F 63°F1012.8 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi51 min W 13 G 17 62°F 69°F1012.5 hPa
46237 - San Francisco Bar, CA (142) 32 mi69 min 60°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi49 min NW 18 G 21 57°F 56°F7 ft1013.1 hPa (+0.6)

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA6 mi46 minWNW 710.00 miPartly Cloudy66°F43°F43%1011 hPa
Oakland, Metro Oakland International Airport, CA16 mi46 minW 710.00 miPartly Cloudy65°F44°F47%1012.5 hPa
Hayward, Hayward Air Terminal, CA17 mi45 minW 1210.00 miA Few Clouds65°F43°F45%1013.5 hPa
Livermore, Livermore Municipal Airport, CA18 mi46 minW 910.00 miFair68°F43°F40%1011.9 hPa

Wind History from CCR (wind in knots)
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Last 24hrW8W18W12W14
G23
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SW14W13W11W9W5W8W3W6W5SW4W6SW4SW5W9W11SW6NW7
1 day agoCalmW7NE8W10
G15
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W7W10SW6SW7SW3S3W7S3SW6S3W11SW8W8S6S6SW8SW9SW12W8
G18
2 days agoSW13W11SW10SW9
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SW13SW7SW11SW6SW7W7W9SW4S3SW3S5SW5S5SW6W66Calm

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
Click for Map
Thu -- 02:51 AM PDT     5.04 feet High Tide
Thu -- 06:55 AM PDT     Sunrise
Thu -- 08:19 AM PDT     Moonrise
Thu -- 09:12 AM PDT     0.47 feet Low Tide
Thu -- 03:23 PM PDT     5.16 feet High Tide
Thu -- 07:06 PM PDT     Sunset
Thu -- 08:18 PM PDT     Moonset
Thu -- 09:46 PM PDT     0.64 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.14.24.854.63.72.61.60.90.50.71.42.63.84.75.154.43.42.31.40.80.71.1

Tide / Current Tables for Stake Point .9 Mi NNW, Suisun Bay, California Current
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Stake Point .9 Mi NNW
Click for Map
Thu -- 02:29 AM PDT     0.88 knots Max Flood
Thu -- 05:16 AM PDT     -0.00 knots Slack
Thu -- 06:55 AM PDT     Sunrise
Thu -- 08:18 AM PDT     Moonrise
Thu -- 08:23 AM PDT     -0.75 knots Max Ebb
Thu -- 11:14 AM PDT     0.00 knots Slack
Thu -- 02:43 PM PDT     0.87 knots Max Flood
Thu -- 05:48 PM PDT     -0.00 knots Slack
Thu -- 07:05 PM PDT     Sunset
Thu -- 08:17 PM PDT     Moonset
Thu -- 09:06 PM PDT     -0.70 knots Max Ebb
Thu -- 11:48 PM PDT     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.70.90.80.60.1-0.3-0.6-0.7-0.7-0.5-0.10.30.70.80.90.70.4-0.1-0.4-0.6-0.7-0.6-0.3

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 (15,3,4,5)
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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.