Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Coloma, 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 7:12AMSunset 4:44PM Thursday December 13, 2018 12:13 PM PST (20:13 UTC) Moonrise 11:44AMMoonset 10:41PM Illumination 37% Phase: Waxing Crescent; Moon at 6 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 818 Am Pst Thu Dec 13 2018
Today..N winds up to 10 kt.
Tonight..SE winds up to 10 kt.
Fri..S winds 10 to 20 kt with gusts up to 30 kt. Rain likely.
Fri night..S winds 5 to 15 kt with gusts up to 25 kt. Rain likely.
Sat..SE winds 5 to 10 kt. A chance of showers.
Sat night..E winds around 5 kt.
Sun..S winds 10 to 15 kt. Rain.
Mon..W winds around 5 kt. A chance of showers.
PZZ500 818 Am Pst Thu Dec 13 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest swell will increase across the waters through Friday night creating hazardous conditions particularly for smaller vessels. A significant long period northwest swell is then expected to arrive late Sunday into Monday through Tuesday, with very long period forerunners arriving Sunday morning.


7 Day Forecast for Marine Location Near Coloma, CA
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location: 38.81, -120.92     debug


Area Discussion for - Sacramento, CA
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Fxus66 ksto 131207
afdsto
area forecast discussion
national weather service sacramento ca
407 am pst Thu dec 13 2018

Synopsis
Dry weather today and tonight with areas of valley fog. Light rain
spreading over the north state Friday with breezy south winds and
light snow over the mountains. A moderate storm system moves
through norcal late Sunday into Monday with mountain travel
impacts likely. Minimal weather impacts the remainder of the week.

Discussion
Upper ridging over the west coast for dry conditions this morning
with just some high cloudiness spilling through the ridge. Light
winds in the central and northern sacramento valley precluding
morning fog there but lighter winds from about sacramento
southward allowing for some areas of morning fog in the southern
sacramento and northern san joaquin valleys. Upper ridge will keep
precipitation out of the region through tonight but increasing
cloud cover should keep fog to a minimum Friday morning. Models
fairly consistent on timing of next pacific frontal passage
through norcal on late Friday and Friday night. The precipitable
water plume associated with this system is not particularly
moisture with PV values of about 3 4 inch predicted. Therefore,
qpf values and snow amounts with this system are not very high and
impacts associated with the system are minimal. Most areas will
see breezy south winds ahead of this system Friday afternoon with
the highest winds over the mountains where gusts in the 30 and 40
mph are predicted.

Both ECMWF and GFS keep lingering showers over the CWA on Saturday
as a upper shortwave and lingering moisture combine to produce
isolated showers over at least the northern portions of the
forecast area. Next, moister pacific frontal system currently
forecast to start pushing into norcal mid day Sunday. Precipitable
water values feeding this system forecast at well over an inch so
this should be a much better precipitation producer.

Models still handling this system differently as it moves inland
with GFS still splitting the system taking bulk of precipitation
south of the forecast area while ECMWF keeps a more consolidated
solution taking heaviest precip through the central part of the
state. This difference makes precipitation quantity forecasting
and even timing very tricky. For this morning, weighed heavily on
wpc solution which seemed to use a middle ground approach. Snow
levels below 7000 feet translate to at least several inches of
snow over the passes Sunday through Monday so mountain impacts
are likely. Which ever model scenario works out best, most
precipitation should be moving into the sierra by Monday morning.

.Extended discussion (Monday through Thursday)
a low pressure system will be passing over northern california
early Monday morning bringing rain and mountain snow to the
region. The bulk of the precipitation is forecast to fall between
midnight and 9am with showers expected for the afternoon. There is
some uncertainty as to what will happen for the rest of the week
as the ECMWF and the GFS vastly differ. The ECMWF tries to push
another system into northwest california, which would clip our
most northern counties; however, the GFS supports ridging over the
area. If the GFS pans out, we'd likely see drier and warmer
weather with the potential for some valley fog. Models then try to
come back into agreement for Thursday Friday with both having a
weak system advance towards the region. The GFS seems to be faster
and lighter while the ECMWF is slower and brings the precip in on
Friday.

Aviation
High clouds are streaming over northern california this morning
withVFR conditions prevailing at most of the TAF sites. MVFR to
ifr conditions will remain possible for areas south of ksac, but
the high cloud may limit fog development. Once the morning clouds
exit the region, any fog that developed will dissipate.

Sto watches warnings advisories
None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 72 mi89 min ENE 12 52°F 1026 hPa39°F
PCOC1 - 9415144 - Port Chicago, CA 79 mi44 min ENE 8 G 9.9 50°F 53°F1025.8 hPa
RCMC1 - 9414863 - Richmond, CA 100 mi44 min 56°F

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Auburn Municipal Airport, CA13 mi19 minN 08.00 miFair55°F39°F55%1024.7 hPa
Lincoln Regional Karl Harder Field, CA24 mi19 minWNW 57.00 miFair54°F42°F67%1025.7 hPa

Wind History from AUN (wind in knots)
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Last 24hrNW76NW74NW5CalmCalmCalmCalmE4E6SE4SE6E6E8CalmCalmCalmE4CalmE4CalmSW4NW4
1 day agoSE6CalmSW6CalmCalmSE4CalmCalmCalmSE4SE5E3SE8E3E4E4CalmCalmCalmCalmCalmCalmNW3Calm
2 days agoW6CalmW64W5CalmCalmCalmCalmCalmCalmSE3CalmE5E4CalmCalmCalmCalmCalmCalmS4S5SE3

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Thu -- 06:34 AM PST     -0.02 feet Low Tide
Thu -- 07:15 AM PST     Sunrise
Thu -- 11:45 AM PST     Moonrise
Thu -- 12:13 PM PST     2.34 feet High Tide
Thu -- 04:45 PM PST     Sunset
Thu -- 06:51 PM PST     0.79 feet Low Tide
Thu -- 10:20 PM PST     2.30 feet High Tide
Thu -- 10:44 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.11.71.20.80.40.1000.311.62.12.32.321.71.310.80.81.11.82.32.3

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Thu -- 05:04 AM PST     -0.02 feet Low Tide
Thu -- 07:14 AM PST     Sunrise
Thu -- 11:04 AM PST     2.34 feet High Tide
Thu -- 11:45 AM PST     Moonrise
Thu -- 04:45 PM PST     Sunset
Thu -- 05:21 PM PST     0.79 feet Low Tide
Thu -- 09:11 PM PST     2.30 feet High Tide
Thu -- 10:44 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.10.60.30.1-00.10.61.21.82.22.32.221.61.20.90.80.91.422.32.32.1

Weather Map and Satellite Images
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wmap_P
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (15,3,4,5)
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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.