Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Geyserville, 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 7:19AMSunset 4:52PM Thursday December 13, 2018 1:16 AM PST (09:16 UTC) Moonrise 11:52AMMoonset 10:50PM Illumination 32% 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
    EDIT      (on/off)   Help
PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 810 Pm Pst Wed Dec 12 2018
.small craft advisory in effect through late Friday night...
Tonight..N winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 10 to 13 ft at 15 seconds.
Thu..SE winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 10 to 13 ft at 16 seconds.
Thu night..SE winds 15 to 25 kt with gusts up to 35 kt. Wind waves 3 to 5 ft. NW swell 9 to 11 ft at 16 seconds.
Fri..S winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. NW swell 8 to 12 ft at 16 seconds. Rain.
Fri night..N winds 5 to 15 kt. Wind waves 2 ft or less. W swell 12 to 15 ft at 16 seconds. A chance of showers.
Sat..SE winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 9 to 13 ft.
Sat night..SE winds 10 to 20 kt. Wind waves 2 ft or less. W swell 6 to 9 ft. A chance of showers.
Sun..S winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 13 to 18 ft. Rain.
Mon..S winds up to 10 kt. Wind waves 2 ft or less. W swell 14 to 19 ft. A chance of showers.
PZZ500 810 Pm Pst Wed Dec 12 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northerly winds will gradually diminish across the waters tonight before turning southerly late Thursday night ahead of the next storm system set to arrive on Friday. Northwest swell will increase across the waters into tomorrow creating hazardous conditions, particularly for smaller vessels. A more significant long period northwest swell is then expected to arrive late Sunday into Monday. SWells across open water could reach or even exceed 20 feet.


7 Day Forecast for Marine Location Near Geyserville, CA
   Hourly   EDIT   Help
location: 38.71, -123     debug


Area Discussion for - Sacramento, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 ksto 122305
afdsto
area forecast discussion
national weather service sacramento ca
305 pm pst Wed dec 12 2018

Synopsis
Dry weather until the end of the week when a more active storm
pattern returns.

Discussion
Northerly winds increased behind the departing short-wave trof and
the building ridge behind it this afternoon resulting in local
adiabatic warming effects over norcal. Some early "spring-like"
temps occurred for mid dec with maxes in the low to mid 60s in the
vly, some 5-10 degrees above normal. Although the nly winds should
diminish overnight, the winds and drying air mass will preclude
widespread fog development, limiting it to the NRN san joaquin vly.

Some high cloudiness will once again spill over the building ridge
but can't rule out some fog developing in the wind-sheltered,
colder mtn valleys basins later tonight.

Dry weather pattern continues on Thursday with lighter nly winds.

Most areas will be cooler not as warm in the vly due to less
adiabatic warming, but it will continue to run a few degrees above
normal.

A pacific frontal band is forecast to move into through norcal
fri Fri nite, weakening as it moves inland and into the sierra, as
noted by the GEFS gfs ivt loop. Reasonable confidence in qpfs with
generally around 0.50" in the shasta mtns and coastal range, and
from 0.50" to 1.0" over the SRN cascade sierra north of the 80 50
corridor with amounts tapering south of hwy 50. Snow levels aoa
5000-5500 ft will have some minor travel impacts over the mtn
passes Fri nite.

Sat expected to be a mostly dry day, except for some light waa
precip possible over the sierra. Generally, norcal should be between
wx systems on Sat ahead of the long wave trof for Sun mon. Jhm
.Extended discussion (Sunday through Wednesday)
the amplitude of long wave trof bodes well for precip Sun mon, but
confidence is lower in amounts and timing as longer waves usually
progress slower than progged. Compared to yesterday, today's
models seem to continue the trend of being about 6-12 hrs slower,
especially the GFS which is trending slower than the ecmwf. It now
appears that the bulk of the precip over our CWA will occur sun
nite into early mon. This slower movement has prompted some
modifications to snow levels from previous forecasts as norcal
will be in the warm sector of the system on sun.

The us W coast ar landfall tool shows a weak ar (probability of ivt
>250 kg m s) over the pacific and forecast to reach the coast early
sun (12 16). (this ar is preceded by 2 others, mainly impacting
the pac nw.) this ar has greater amplitude, a la the long wave
trof, extending from 55n to 35n, and there is actually a little
moderate ivt value (>500 kg m s) embedded within the plume between
37n-43n, which is line with at least most of norcal and our cwa.

The plume is forecast to become parallel to the coastline and
erode weaken as it moves inland which doesn't bode well for
significant precip E of sierra, but will at least result in a
wetter storm for norcal than its predecessor on fri. The lack of
duration over our CWA and lack of an orthogonal trajectory to the
sierra will keep precip amounts lower than a more favorable
trajectory and orientation. Also, the GFS shows the precip
splitting over the sierra as it forecasts the formation of a
closed low over socal on mon. This results in stronger ridging
over norcal than what is forecast by the ECMWF which shows flatter
ridging and a trend for WAA precip into tue, yielding to higher
uncertainty in pop QPF after this system moves through. Towards
the end of the efp, the models trend dry and warm as high pressure
amplifies over the WRN states. This should return the chance of
vly stratus fog Tue Wed in the forecasts as strong subsidence
returns.

Very early, preliminary estimates of liquid precip for the
sun-mon storm suggests 2-3 inches over shasta county, and 1-2 inches
over coastal range and the sierra especially north of the 80 50
corridor, and over an inch in the NRN sac vly tapering to two-thirds
to three-quarters of an inch over the dts, and a half inch inch over
the NRN san joaquin vly. This system should cause greater snow
impacts over the sierra passes than the Fri system with snow
levels 5000-6000 ft, lowering to around 5000-5500 kft mon. Jhm

Aviation
Gusty northwest winds will decrease this evening with winds
becoming light overnight. MVFR and ifr conditions will be possible
due to fog at sites south of ksac. Otherwise,VFR conditions are
expected through the period. &&

Sto watches warnings advisories
None.



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
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 36 mi37 min NE 5.8 G 7.8 57°F1025.1 hPa
ANVC1 - 9416841 - Arena Cove, CA 40 mi47 min E 2.9 G 8 47°F 55°F1025.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 49 mi47 min 56°F1025.3 hPa

Wind History for Arena Cove, CA
(wind in knots)    EDIT      (on/off)   Help
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
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
Last
24hr
NW3
G9
NW3
G6
W4
G8
SW2
G6
W4
S2
E3
NE2
NW2
G6
W2
G5
NW5
G10
W8
G11
NW5
G9
W3
G6
W4
NW4
E3
E3
E4
E4
G7
E4
E2
G6
NE4
G8
E4
G8
1 day
ago
NE2
SW1
G4
W2
G7
SW3
G7
S2
NE3
G7
E2
G5
NW3
W3
G7
NW4
G10
W6
G10
NW5
G8
W7
G11
NW3
G9
NW3
G7
NW3
E1
G4
E1
E3
--
E2
SW1
N1
G5
W4
G8
2 days
ago
W1
G7
E1
E1
E2
E1
W3
G7
W8
G14
W9
G15
NW7
G11
NW8
G13
W8
G12
W5
G10
W4
G7
N1
E3
G6
E2
E4
E3
NE4
G7
NE1
G5
E2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA17 mi24 minN 09.00 miFair40°F39°F97%1024.5 hPa

Wind History from STS (wind in knots)
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
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
Last 24hrCalmCalmW3CalmCalmCalmSW4CalmNW4NW6NW4NW6NW5W9W6SW5CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmW3W3CalmCalmCalmCalm3NW5CalmS4S4S5SE5CalmCalmW3NW5CalmCalmCalmCalm
2 days agoCalmNW3CalmCalmCalmCalmCalmCalmCalmCalm3W34S4S4S4CalmNW3NW3CalmCalmCalmCalmCalm

Tide / Current Tables for Fort Ross, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Fort Ross
Click for Map
Thu -- 03:40 AM PST     4.58 feet High Tide
Thu -- 07:21 AM PST     Sunrise
Thu -- 09:19 AM PST     3.06 feet Low Tide
Thu -- 11:52 AM PST     Moonrise
Thu -- 02:04 PM PST     4.39 feet High Tide
Thu -- 04:52 PM PST     Sunset
Thu -- 09:11 PM PST     0.53 feet Low Tide
Thu -- 10:51 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
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
2.53.34.14.54.64.443.63.23.13.13.43.84.24.44.33.83.12.21.40.80.50.71.2

Tide / Current Tables for Salt Point, California Current
   EDIT      (on/off)   Help   One Week of Data
Salt Point
Click for Map
Thu -- 01:15 AM PST     0.86 knots Max Flood
Thu -- 04:47 AM PST     -0.00 knots Slack
Thu -- 06:58 AM PST     -0.58 knots Max Ebb
Thu -- 07:22 AM PST     Sunrise
Thu -- 10:44 AM PST     0.00 knots Slack
Thu -- 11:53 AM PST     Moonrise
Thu -- 01:07 PM PST     0.44 knots Max Flood
Thu -- 03:44 PM PST     -0.00 knots Slack
Thu -- 04:52 PM PST     Sunset
Thu -- 07:01 PM PST     -0.99 knots Max Ebb
Thu -- 10:51 PM PST     Moonset
Thu -- 10:56 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
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
0.70.90.80.60.3-0.1-0.5-0.6-0.5-0.3-0.20.10.30.40.40.2-0.1-0.5-0.8-1-0.9-0.6-0.30

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (4,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Sacramento, 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.