Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Geyserville, 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 6:57AMSunset 7:09PM Thursday September 21, 2017 2:23 PM PDT (21:23 UTC) Moonrise 7:23AMMoonset 7:21PM 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 850 Am Pdt Thu Sep 21 2017
.small craft advisory in effect through this evening...
Today..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 5 to 7 ft at 11 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft at 10 seconds.
Fri..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds.
Fri night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft at 10 seconds.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft at 10 seconds.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft.
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 Geyserville, CA
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location: 38.71, -123     debug


Area Discussion for - Sacramento, CA
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Fxus66 ksto 211150
afdsto
area forecast discussion
national weather service sacramento ca
450 am pdt Thu sep 21 2017

Synopsis
Unseasonably cool weather system will bring mountain rain and
snow showers into early tonight. Several inches of snow are
possible at high elevations. Turning warmer and drier this
weekend.

Discussion
A winter like trough will continue dropping south into northern
california today. Disturbance currently over southern oregon will
swing through the sierra during mid-morning and exit early
tonight. Steepening lapse rates will contribute to increasing
instability over the sierra... Especially locations above 5000
feet. Short term meso-scale models(hrrr) support scattered
convection this afternoon at higher elevations and have introduced
thunderstorms to the forecast.

Snow levels presently around 7000 feet along the I 80 and highway
50 corridors will fall to around 6000 feet during the day as cold
air advection works south. Moisture is a bit limited... However
cold early nature and sufficient instability will act efficiently
with available moisture. Hrrr nbm give liquid precip amounts from
0.25-0.75 inches over the sierra. Snow amounts from 3 to 6 inches
with higher amounts over peaks seems likely in this scenario.

Since late september is an unusually early time for this amount
of snow have decided to issue a winter weather advisory above 7000
feet with main concern near donner pass. Convective nature of
showers will mean potentially large variability in amounts from
place to place.

Trough will shift east into northern nevada with cut-off low
developing. Second disturbance will drop south along the sierra
late Friday with another quick shot of snow above 6500 feet with
the focus more south of highway 50. 2 to 4 inches looks possible
at this time.

.Extended discussion (Monday through Thursday)
high pressure ridging spreads in from the west as the deep upper
trough shifts eastward into the rocky mountain region by early
next week. Confidence is high for a warm and dry pattern over
norcal at least through the first half of next week. Temperatures
will be above normal starting on Monday, and trending upward a few
degrees more on Tuesday. Valley highs generally in the lower 90s
are forecast for Tuesday through Thursday.

Breezy north winds are expected to continue through mid week next
week. These winds will act to warm and dry the area, creating an
elevated fire risk for the area. Ek

Aviation
Vfr conditions expected for valley TAF sites for the next 24
hours. Scattered mountain foothill rain showers and isolated
thunderstorms expected through tonight, along with snow showers
above 6000 feet. Northerly winds expected with gusts up to 14-18
kts at TAF locations this afternoon. Ek

Sto watches warnings advisories
Winter weather advisory in effect from 8 am this morning to
11 pm pdt this evening above 7000 feet...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 36 mi44 min NW 19 G 25 58°F 59°F1012.9 hPa54°F
ANVC1 - 9416841 - Arena Cove, CA 40 mi54 min WNW 8 G 15 60°F 54°F1014.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 49 mi54 min WNW 23 G 28 63°F 55°F1012.5 hPa

Wind History for Arena Cove, CA
(wind in knots)    EDIT      (on/off)   Help
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W9
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W8
G14
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA17 mi31 minN 810.00 miA Few Clouds74°F37°F27%1009.5 hPa

Wind History from STS (wind in knots)
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Last 24hrW12
G21
W16
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W10W8W6NW6NW7CalmNW6W8CalmCalmCalmE3NW4CalmCalmNW3N11NW10
G19
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1 day agoNW12
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NW9NW12
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NW13NW8NW103N6N13N8NW9W4SW3CalmCalmCalmCalmS43SW8SW7W45W9
2 days agoW17
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SW10SW8N17NW16
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NW13NW9NW9N6N6W3N3W4SE3CalmCalmCalmCalmN4NW9N12
G18
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G20
NW12
G22

Tide / Current Tables for Fort Ross, California
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Fort Ross
Click for Map
Thu -- 06:07 AM PDT     0.68 feet Low Tide
Thu -- 07:00 AM PDT     Sunrise
Thu -- 08:24 AM PDT     Moonrise
Thu -- 12:23 PM PDT     5.59 feet High Tide
Thu -- 06:33 PM PDT     0.75 feet Low Tide
Thu -- 07:10 PM PDT     Sunset
Thu -- 08:22 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.65.24.33.11.910.70.91.72.83.955.55.54.83.72.51.40.80.81.42.33.44.4

Tide / Current Tables for Salt Point, California Current
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Salt Point
Click for Map
Thu -- 01:18 AM PDT     -0.00 knots Slack
Thu -- 04:05 AM PDT     -1.23 knots Max Ebb
Thu -- 07:00 AM PDT     Sunrise
Thu -- 07:44 AM PDT     0.00 knots Slack
Thu -- 08:24 AM PDT     Moonrise
Thu -- 10:36 AM PDT     1.09 knots Max Flood
Thu -- 01:37 PM PDT     -0.00 knots Slack
Thu -- 04:25 PM PDT     -1.23 knots Max Ebb
Thu -- 07:11 PM PDT     Sunset
Thu -- 08:05 PM PDT     0.00 knots Slack
Thu -- 08:22 PM PDT     Moonset
Thu -- 10:59 PM PDT     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.2-0.5-1-1.2-1.1-0.8-0.40.20.711.10.90.4-0.3-0.9-1.2-1.2-0.9-0.6-0.10.511.1

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 Sacramento, CA (17,4,5,8)
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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.