Friday, March24, 2017 L-36.com


Marine Weather and Tides
Discovery Bay, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:01AMSunset 7:22PM Thursday March 23, 2017 11:08 PM PDT (06:08 UTC) Moonrise 3:22AMMoonset 1:57PM Illumination 12% Phase: Waning Crescent; Moon at 26 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 San Francisco Bay North Of The Bay Bridge- 849 Pm Pdt Thu Mar 23 2017
.small craft advisory in effect from 5 am pdt Friday through Friday afternoon...
Tonight..S winds 10 to 20 kt. Slight chance of rain late in the evening, then chance of rain after midnight.
Fri..S winds 15 to 25 kt. Rain.
Fri night..SW winds 10 to 20 kt...becoming west 10 kt after midnight. Rain likely in the evening, then slight chance of showers after midnight.
Sat..NW winds 10 kt.
Sat night..W winds 5 to 15 kt.
Sun..S winds 5 to 15 kt. Chance of showers, then showers likely.
Mon..W winds 10 to 20 kt. Slight chance of showers.
Tue..W winds 5 to 15 kt.
PZZ500 849 Pm Pdt Thu Mar 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Occasional gale force gusts are possible late tonight and into tomorrow as a storm system impacts the region with strong southerly winds. Rough seas possible just ahead of and behind the frontal passage, but should begin to decrease by Saturday. Expect northwest winds to return by Saturday as well before briefly becoming southerly on Sunday as another weak system moves over the waters.

7 Day Forecast for Marine Location Near Discovery Bay, CA
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location: 37.89, -121.49     debug


Area Discussion for - Sacramento, CA
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Fxus66 ksto 240541
afdsto
area forecast discussion
national weather service sacramento ca
1040 pm pdt Thu mar 23 2017

Synopsis
Rain and mountain snow returns tonight and Friday. Sierra snow
impacts likely late tonight into Saturday. Another system possible
Sunday and Monday with mountain travel impacts. Brief break in
precip mid weekend but more precipitation early next week.

Discussion
Ir imagery shows a fully occluded system off the wa coast. The
vertically stacked system indicates the surface low is off the wa
coast as well. This means the low is likely too far N of our area
for the strongest of pressure gradients and the strongest of 925 mbs
winds. These winds are forecast to be in the low 40s kts Fri morning
with the NAM forecast bufkit soundings forecasting very limited
downward momentum transfer of these winds. There is a vast
difference (one with wad criteria, the other without) in the mos
guidance from the models this evening. The strongest gradients and
thickness solenoids occur during the 18z Fri time frame, so late
morning into early afternoon looks to be the period of strongest
valley winds. Jhm

Previous discussion
Pacific storm system now approaching the coast will move into norcal
late tonight bringing a return to precipitation. The heaviest
amounts will fall during the day Friday. Valley rainfall amounts
will range from 1-2 inches redding area to 0.25-0.50 stockton/
modesto. Mountain precip amounts will be 1-2 inches liquid. Snowfall
amounts 8-14 inches above 4500 feet with up to two feet highest
elevations. Expect significant travel delays over the sierra.

Activity will turn more showery Friday afternoon with mesoscale
models showing thunderstorms over the northern sacramento valley.

Tightening pressure gradient will bring a few 40 mph south wind
gusts up the sacramento valley... Stockton to redding... Strongest
central valley around red bluff.

Models continue the trend of drier weather Saturday with weak
ridge northwest flow. Next system will drop through norcal Sunday
afternoon through Monday and looks to be slightly drier but colder
than Friday system. Snow levels look to be 4000 feet or lower.

.Extended discussion (Monday through Thursday)
showers will linger on Monday as upper level wave moves through.

Have boosted snow amounts a bit during the day with snow levels
around 5000 feet. Modest additional accumulations likely but will
probably be enough to cause a few travel delays. Have also
introduced the possibility of thunderstorms during the
afternoon/evening hours. This will hinge on the amount of clearing
in the morning but models are indicating some decent instability.

Ridging then builds in for Tuesday and Wednesday with warming
temperatures. Models continue to show another system dropping into
the area from the gulf of alaska on Thursday but disagree on the
details. At this time, best chances for precipitation looks to lie
across northern and eastern portions of the area.

Ceo

Aviation
Next system moves into norcal tonight into Friday.VFR conditions
through this evening then local MVFR/ifr conditions after 12z
Friday with precipitation. Winds will increase on Friday with
gusts to around 25 kts at TAF sites.

Sto watches/warnings/advisories
Winter storm warning from 11 pm this evening to 5 am pdt
Saturday for west slope northern sierra nevada-western plumas
county/lassen park.

Wind advisory from 9 am to 7 pm pdt Friday for carquinez strait
and delta-central sacramento valley-motherlode-northeast
foothills/sacramento valley-northern sacramento valley-northern
san joaquin valley-southern sacramento valley.

Winter storm warning from 11 pm this evening to 5 am pdt
Saturday for shasta lake area / northern shasta county.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 23 mi51 min W 1.9 G 5.1 55°F 1023 hPa
PCOC1 - 9415144 - Port Chicago, CA 31 mi51 min SSW 2.9 G 6 53°F 58°F1023.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi51 min SW 2.9 G 4.1 54°F 58°F1023.7 hPa47°F
UPBC1 35 mi51 min WSW 4.1 G 5.1
SFXC1 - San Francisco Bay Reserve, CA 36 mi84 min WNW 4.1 51°F 1023 hPa47°F
LNDC1 42 mi51 min S 2.9 G 4.1 55°F 1023.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi51 min SW 4.1 G 6 55°F 1023.1 hPa
AAMC1 - 9414750 - Alameda, CA 44 mi51 min S 4.1 G 5.1 55°F 61°F1023.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 45 mi51 min S 2.9 G 5.1
OBXC1 45 mi51 min 55°F 45°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 45 mi51 min S 4.1 G 6 55°F 1023.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 46 mi51 min S 5.1 G 6 56°F 1023.5 hPa
RTYC1 - 9414523 - Redwood City, CA 47 mi51 min SSE 2.9 G 4.1 54°F 60°F1023.1 hPa
PXSC1 48 mi51 min 55°F 45°F
RCMC1 - 9414863 - Richmond, CA 49 mi57 min S 5.1 G 7 55°F 57°F1023.1 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Stockton, Stockton Metropolitan Airport, CA13 mi14 minNE 310.00 miOvercast54°F46°F75%1023 hPa
Livermore, Livermore Municipal Airport, CA22 mi16 minSSE 310.00 miMostly Cloudy52°F43°F72%1023.4 hPa

Wind History from SCK (wind in knots)
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Last 24hrW8W8W7W9W9W8NW4W6W6NW6NW8NW5NW6W4Calm35W4NW7W5NW8W9NW5NE3
1 day agoSE6SE9SE6S3S6W7SE4E4CalmSE6SE7SE54E5SE4SE6E7SW4W13
G19
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2 days agoSE11SE11SE11S10S8SE14SE15
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Tide / Current Tables for Borden Highway Bridge, Middle River, San Joaquin River, California
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Borden Highway Bridge
Click for Map
Fri -- 05:02 AM PDT     Moonrise
Fri -- 05:44 AM PDT     2.82 feet High Tide
Fri -- 07:02 AM PDT     Sunrise
Fri -- 11:18 AM PDT     1.00 feet Low Tide
Fri -- 03:57 PM PDT     Moonset
Fri -- 04:49 PM PDT     3.04 feet High Tide
Fri -- 07:22 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.51.11.72.32.72.82.62.11.61.211.11.52.12.6332.92.41.81.20.70.3

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Fri -- 01:35 AM PDT     0.00 knots Slack
Fri -- 04:45 AM PDT     0.62 knots Max Flood
Fri -- 05:01 AM PDT     Moonrise
Fri -- 07:02 AM PDT     Sunrise
Fri -- 07:11 AM PDT     -0.00 knots Slack
Fri -- 10:27 AM PDT     -0.66 knots Max Ebb
Fri -- 01:18 PM PDT     0.00 knots Slack
Fri -- 03:48 PM PDT     0.57 knots Max Flood
Fri -- 03:56 PM PDT     Moonset
Fri -- 06:14 PM PDT     -0.00 knots Slack
Fri -- 07:21 PM PDT     Sunset
Fri -- 10:12 PM PDT     -1.06 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-0.30.10.40.60.60.40.1-0.3-0.5-0.6-0.6-0.5-0.10.30.50.60.40.1-0.3-0.7-1-1.1-1

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 (2,6,7,8)
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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.