Thursday, May24, 2018 L-36.com


Marine Weather and Tides
Penn Valley, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:43AMSunset 8:22PM Thursday May 24, 2018 6:33 PM PDT (01:33 UTC) Moonrise 2:32PMMoonset 2:19AM Illumination 77% Phase: Waxing Gibbous; Moon at 10 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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7 Day Forecast for Marine Location Near Penn Valley, CA
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location: 39.21, -121.2     debug


Area Discussion for - Sacramento, CA
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Fxus66 ksto 242125
afdsto
area forecast discussion
national weather service sacramento ca
225 pm pdt Thu may 24 2018

Synopsis
Afternoon and evening thunderstorms possible mainly over higher
terrain this week. These are expected to extend across the valley
Friday. Slightly cooler than normal temperatures continue across
most of the region through Saturday, warming to well above normal
early next week.

Discussion
Main forecast concerns for the short term period are continued
chances for mountain thunderstorms, rain and isolated thunder for
the valley Friday, snow accumulations for high elevations of the
sierra south of highway 50 Friday through Saturday.

Latest water vapor and model analysis shows the cut off upper
level low has now moved well outside the region of weather
influence as another disturbance approaches northern california
from the west. Upper flow has returned to the northwest, which
will continue to allow for thunderstorm development, but storms
should move to the east of the crest this afternoon and tonight
instead of to the west. Brief heavy downpours and some small hail
can be expected in the stronger storms.

Friday will be the coolest day of the week as the upper low passes
directly overhead. Temperatures across the area will range between
10 and 20 degrees below normal with chances for valley rain and
isolated thunder, mainly in the morning. Latest model runs have
the majority of the instability over the mountains Friday, so
valley thunder is expected to be minimal. However, scattered rain
showers in the morning for the valley commute is possible.

With the cold system moving overhead, chances for snow showers are
possible for the high sierra (8000 feet and above) for locations
south of highway 50. Model forecasts have swayed a bit on the
actual accumulation amounts, but wpc 50th percentiles have
somewhere between 1 and 3 inches of snow expected by Saturday. Due
to memorial day weekend outdoor recreation, went with a winter
advisory for locations near the area.

Heading into the weekend, and upper level ridge builds and
temperatures will begin to warm back to and slightly above normal.

Temperatures across northern california are expected to increase
by 15 to 30 degrees from Friday to Sunday.

.Extended discussion (Monday through Thursday)
we will see a ridge to start the extended period and that will
bring a big warm up for norcal. We will see some of the warmest
highs so far this year and they will run 30-40 degrees warmer than
Friday's expected highs. If you have outdoor plans for the
holiday weekend you will want to be prepared for the heat. With
the ridge overhead we will see dry conditions. As we head into the
mid part of the week we will see a trough push the ridge
eastward. This will cool are daytime highs back to near normal.

This trough will also bring back the chance for mountain showers
and thunderstorms mainly during the afternoon and evenings.

Looking at soundings and CAPE values it does look rather weak and
that should keep the activity isolated.

-cjm

Aviation
Vfr conditions are expected at the TAF sites through 9z. We will
see increasing clouds this evening with overcast skies between
3500 and 5000 feet developing in the late overnight. Light
scattered showers are expected at the TAF sites after 9z and will
taper off around the southern terminals by 18z. Showers will
linger up north into the evening. MVFR ifr will be possible in the
vicinity of any showers. Overall we will see 5-11 knots winds but
10-18 knots during the evening.

-cjm

Sto watches warnings advisories
Winter weather advisory from 5 am Friday to 5 am pdt Saturday
for west slope northern sierra nevada.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 82 mi109 min W 16 62°F 1016 hPa52°F
PCOC1 - 9415144 - Port Chicago, CA 91 mi52 min WSW 16 G 22 59°F 64°F1016.3 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nevada County Air Park, CA10 mi59 minWSW 510.00 miFair68°F48°F49%1015.9 hPa
Marysville, Beale Air Force Base, CA14 mi96 minS 910.00 miFair79°F55°F44%1012.4 hPa
Auburn Municipal Airport, CA19 mi39 minSSW 710.00 miFair72°F51°F50%1014.9 hPa
Marysville, Yuba County Airport, CA21 mi41 minSSE 1010.00 miFair77°F51°F40%1013 hPa
Lincoln Regional Karl Harder Field, CA22 mi59 minS 910.00 miFair77°F42°F30%1012.9 hPa

Wind History from GOO (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmE5CalmE4E5CalmCalmCalmCalmCalmW3W5NW7W6W6W8W6W6SW4SW5
1 day agoS3CalmS4CalmE4E4CalmCalmSE3E5CalmCalmCalmCalmCalmCalmS5S3S5S6SE6S4S5S4
2 days agoS3S3SE4SE4SE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW3SW5SW5W5SW6W7N4CalmSE3

Tide / Current Tables for Sacramento, Sacramento River, California
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Sacramento
Click for MapNote: These data apply only during low river stages.

Thu -- 03:20 AM PDT     Moonset
Thu -- 04:13 AM PDT     2.78 feet High Tide
Thu -- 05:47 AM PDT     Sunrise
Thu -- 11:56 AM PDT     0.23 feet Low Tide
Thu -- 03:33 PM PDT     Moonrise
Thu -- 04:12 PM PDT     2.19 feet High Tide
Thu -- 08:18 PM PDT     Sunset
Thu -- 11:57 PM PDT     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.81.62.42.82.72.421.510.60.30.20.61.21.82.22.11.91.51.10.70.40.1

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Thu -- 03:20 AM PDT     Moonset
Thu -- 04:13 AM PDT     2.77 feet High Tide
Thu -- 05:47 AM PDT     Sunrise
Thu -- 11:56 AM PDT     0.23 feet Low Tide
Thu -- 03:33 PM PDT     Moonrise
Thu -- 04:12 PM PDT     2.18 feet High Tide
Thu -- 08:18 PM PDT     Sunset
Thu -- 11:56 PM PDT     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.81.62.42.82.72.421.510.60.30.20.61.21.82.22.11.91.51.10.70.40.1

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sacramento, CA (21,6,7,8)
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Ground Weather Radar Station Beal AFB, 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.