Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Walnut Creek, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:50AMSunset 5:53PM Wednesday February 20, 2019 1:11 PM PST (21:11 UTC) Moonrise 7:27PMMoonset 7:50AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 The San Francisco Bay North Of The Bay Bridge- 807 Am Pst Wed Feb 20 2019
.small craft advisory in effect through this evening...
Today..NW winds 10 to 20 kt with gusts up to 30 kt. A chance of showers.
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt.
Thu..N winds 10 to 20 kt with gusts up to 25 kt.
Thu night..N winds 5 to 15 kt with gusts up to 25 kt.
Fri..E winds up to 10 kt.
Fri night..W winds 5 to 15 kt.
Sat..W winds up to 10 kt.
Sun..SW winds 5 to 10 kt. A chance of showers.
PZZ500 807 Am Pst Wed Feb 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds are expected to increase today and remain gusty through the rest of the work week. Widespread gale force conditions are forecast across the outer waters starting late tonight and lasting through Thursday. Isolated gale force gusts will also be possible along the coast. Gusty winds will generate steep fresh swell causing hazardous conditions, especially for smaller vessels. Moderate northwest swell will continue through the end of the week.


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 201730
afdmtr
area forecast discussion
national weather service san francisco bay area
930 am pst Wed feb 20 2019

Synopsis After a few days of dry weather, isolated to
scattered mainly light rain snow showers are forecast to persist
into early Thursday morning. Snowfall will be likely limited to
the highest elevations, especially across the diablo range and the
santa lucia mountains. Dry conditions return on Thursday and
continue into at least Friday before rain chances return to
northern california during the late in the weekend and early next
week.

Discussion As of 08:53 am pst Wednesday... Isolated rain
showers continue to skirt the coastline this morning with
locations from coastal north bay, santa cruz mountains and down
along the central coast have reporting a few hundredths of an
inch. With snow levels estimated to be around 3,500 feet, the
highest peaks above the big sur coast are likely picking up some
snowfall with these showers. With this said, the bulk of
precipitation remains offshore this morning and is likely to
continue this way through the morning. The latest hrrr and other
short-range guidance suggest an increase in showers over the east
bay hills this afternoon that will then shift southward into santa
clara, monterey and san benito counties through the early
evening. Overall, rainfall amounts will be light with many
locations remaining dry throughout the day today. As the ongoing
forecast captures this thinking well, no updates are anticipated
at this time.

Prev discussion As of 3:02 am pst Wednesday... What a difference 24
hours makes... Increasing clouds, stronger winds and even some
showers are leading to much warmer temperatures. The latest 24
hour trend indicates many locations are currently running 6 to 12
degrees warmer than yesterday morning. Therefore, adjust morning
lows upward from previous forecast. Not expecting any frost black
ice concerns this morning. Monterey and salinas airports did
report a rab rae with a trace of precip. Kmux radar imagery did
pick up on this very scattered showers passing through the
monterey bay region. These showers are likely associated with
enhanced lifted from a passing vort max.

For the rest of today... Clouds will continue to increase as an
upstream upper level trough digs farther into norcal. Radar
imagery (kbhx) near eureka is already showing shower activity
associated with the upper trough. The upper trough will ultimately
dig more and become a cut off low over socal S nev on Thursday.

This trajectory is more like an inside slider with much of the bay
area being on the drier side. However, there will still be a
chance for some precip across the bay area over the next 24-36
hours. Latest hi-res model do show showers over the coastal
waters coast early Wednesday spreading inland Wednesday
afternoon early Thursday and then drying N to S Thursday. Not
expecting a real soaker given the lack of moisture, but a few
hundredths to a tenth seems most likely and up to a half inch in
the santa lucia range. It should also be noted the upper trough is
rather cold and snow levels will drop through the day to
2500-3500 feet with minor snow accumulations over the highest
peaks. Lastly, given the cold nature of these showers any stronger
cell with vertical development could have some hail associated
with it.

Clearing develops Thursday night and Friday with shortwave
ridging. Overnight lows will cool off again with some patchy
frost and daytime highs will warm slightly.

Dry weather kicks off the upcoming weekend, but rain chances
gradually increase over the north bay Saturday afternoon before
spreading southward on Sunday.

It will be interesting to watch the pattern beyond Sunday as some
of the models show additional atmospheric rivers impacting norcal.

Latest GFS fv3 models shows a weak to moderate ar moving into
norcal day 6 7 through day 10. A lot can change between now and
then, but it appears the storm door remains open.

Aviation As of 09:30 am pst Wednesday... For 18z tafs. Still
expecting CIGS to lower this morning, but generally remain above
4,000 ft. BorderlineVFR MVFR CIGS through the early afternoon
before CIGS begin to rise. Showers to remain in the vicinity
through the evening hours. Biggest forecast concern today will be
gusty winds. Expecting NW W winds generally 10 to 20 kt with
gusts 20 to 30 kt with the windiest conditions still forecast for
the bay area TAF sites. Winds should taper off tonight.

Vicinity of ksfo... BorderlineVFR MVFR CIGS generally at or above
4,000 ft into the afternoon before CIGS are expected to lift.

Passing showers into the evening with the best chances this
morning through the early afternoon. Windy conditions this
afternoon, gusts 30 to 35 kt with sustained winds 15 to 25 kt.

Winds will subside overnight.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... .Borderline MVFRVFR CIGS around
3,000-5,000 feet today with passing light showers. Showers to
remain in the vicinity into tonight. Increasing NW winds today
with gusts generally around 25 kt into this evening. Winds to ease
overnight.

Marine As of 08:53 am pst Wednesday... Northwest winds are
expected to increase today and remain gusty through the rest of
the work week. Widespread gale force conditions are forecast
across the outer waters starting late tonight and lasting through
Thursday. Isolated gale force gusts will also be possible along
the coast. Gusty winds will generate steep fresh swell causing
hazardous conditions, especially for smaller vessels. Moderate
northwest swell will continue through the end of the week.

Mtr watches warnings advisories
Tday 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... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Sf bay
sca... Mry bay
public forecast: rgass mm
aviation: as
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
UPBC1 10 mi54 min WNW 19 G 25
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi60 min WNW 19 G 22 51°F 49°F1012.4 hPa38°F
PCOC1 - 9415144 - Port Chicago, CA 11 mi60 min W 16 G 19 51°F 49°F1012.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi54 min NW 8.9 G 12 53°F 1012.2 hPa
LNDC1 14 mi54 min WNW 9.9 G 13 54°F 1013 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi54 min WNW 13 G 15 53°F 1012.5 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi54 min WNW 12 G 15 52°F 1013 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi60 min W 14 G 16
AAMC1 - 9414750 - Alameda, CA 16 mi60 min WNW 8.9 G 12 53°F 52°F1013.6 hPa
OBXC1 17 mi54 min 52°F 40°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi54 min WNW 11 G 19 56°F 1012.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi54 min W 8 G 12 54°F 1012.2 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi54 min 53°F
PXSC1 20 mi60 min 54°F 40°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi87 min WNW 8 55°F 1013 hPa37°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi61 min NNW 8.9 53°F 1013 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi60 min W 9.9 G 16 52°F 54°F1013.4 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi54 min W 15 G 21 52°F 53°F1014 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi52 min NW 21 G 27 51°F 55°F1014.3 hPa

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 mi79 minno data10.00 miFair56°F37°F51%1011.4 hPa
Oakland, Metro Oakland International Airport, CA16 mi79 minW 1010.00 miMostly Cloudy55°F41°F59%1013.8 hPa
Hayward, Hayward Air Terminal, CA17 mi78 minW 1510.00 miPartly Cloudy56°F39°F53%1014.5 hPa
Livermore, Livermore Municipal Airport, CA18 mi79 minNW 11 G 1810.00 miPartly Cloudy53°F35°F51%1012.7 hPa

Wind History from CCR (wind in knots)
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Last 24hrCalmCalmN6--SW7W5S5S4S7S5S9S7S9SW10W8W10NW11NW7W6--W8W12W13
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1 day agoN11N8NE10
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NE9CalmCalmS4SW3CalmSE3SE3SE3S3S3Calm3S3SE4SE4CalmCalm3E6
2 days agoNW7W7NW12
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N6SW7S5S4NE6SW4SE4CalmSE3SE3SE3SE3SE3SE3SE3SE6SW3CalmCalmN10
G17

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
Click for Map
Wed -- 02:28 AM PST     5.09 feet High Tide
Wed -- 06:52 AM PST     Sunrise
Wed -- 07:50 AM PST     Moonset
Wed -- 08:03 AM PST     1.31 feet Low Tide
Wed -- 01:51 PM PST     6.07 feet High Tide
Wed -- 05:52 PM PST     Sunset
Wed -- 07:27 PM PST     Moonrise
Wed -- 08:50 PM PST     -0.35 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.44.4554.43.42.41.61.31.62.53.855.96.15.64.63.21.80.7-0.1-0.30.11.2

Tide / Current Tables for Roe Island S, Suisun Bay, California Current
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Roe Island S
Click for Map
Wed -- 01:32 AM PST     0.89 knots Max Flood
Wed -- 04:44 AM PST     -0.00 knots Slack
Wed -- 06:52 AM PST     Sunrise
Wed -- 07:32 AM PST     -1.47 knots Max Ebb
Wed -- 07:49 AM PST     Moonset
Wed -- 10:26 AM PST     0.00 knots Slack
Wed -- 12:59 PM PST     1.02 knots Max Flood
Wed -- 04:00 PM PST     -0.00 knots Slack
Wed -- 05:52 PM PST     Sunset
Wed -- 07:26 PM PST     Moonrise
Wed -- 07:27 PM PST     -2.64 knots Max Ebb
Wed -- 11:25 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.90.90.70.3-0.2-1-1.4-1.4-1.1-0.40.30.810.90.50-1.2-2.1-2.6-2.6-2.2-1.5-0.5

Weather Map and Satellite Images
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GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (16,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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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.