Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Santa Venetia, 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 7:22AMSunset 5:19PM Wednesday January 17, 2018 9:53 PM PST (05:53 UTC) Moonrise 7:46AMMoonset 6:06PM Illumination 2% 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 837 Pm Pst Wed Jan 17 2018
Tonight..S winds 10 kt. Slight chance of rain after midnight.
Thu..S winds 10 to 20 kt. Chance of rain.
Thu night..SW winds 10 to 20 kt...becoming W 10 kt after midnight. Chance of rain in the evening, then chance of showers after midnight.
Fri..W winds 10 kt. Chance of showers.
Fri night..W winds 5 to 15 kt. Slight chance of showers.
Sat..W winds 10 kt.
Sun..SE winds 5 kt...becoming S 5 to 15 kt. Chance of rain, then rain likely.
Mon..SW winds 10 kt...becoming north. Chance of showers.
PZZ500 837 Pm Pst Wed Jan 17 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A large long period westerly swell generated by a strong low pressure system currently off the pacific northwest coast will impact the coastal waters beginning tonight and continuing through the end of the week. This swell will bring hazardous seas to the region as well as large breaking waves to the coastline through Friday.

7 Day Forecast for Marine Location Near Santa Venetia, CA
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location: 38.02, -122.5     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 180515
afdmtr
area forecast discussion
national weather service san francisco bay area
915 pm pst Wed jan 17 2018

Synopsis A weather system approaching form the northwest will
spread rain across the north bay late tonight and Thursday morning
and then southward across the remainder of the forecast area by
Thursday evening. Showers are forecast for Thursday night and Friday
as much colder air settles over the region. A few showers may
linger into Saturday morning, but for the most part Saturday
should be a dry day. The next front will bring rain chances late
Sunday into Monday.

Discussion As of 9:15 pm pst Wednesday... IR satellite imagery
shows a cold frontal boundary approaching the northern california
coast this evening. Latest hrrr and NAM models both forecast light
rain to begin spreading into northwest sonoma county shortly after
midnight tonight, and then develop across much of the north bay
by the morning commute. Rain is then forecast to develop in san
francisco by late morning, across the rest of the sf bay area by
mid-afternoon, and then into the monterey bay area by late
afternoon. Rain is expected to change to scattered showers by
Thursday evening. Both the 00z NAM and 00z GFS then forecast
little additional rainfall from late Thursday evening through
about sunrise Friday. Rainfall amounts through Thursday night are
expected to be light in most areas, generally less than a quarter
of and inch. The exception is northern sonoma county which is
forecast to pick up between a half inch and an inch of rain,
according to the latest nam.

Scattered showers are expected to redevelop on Friday morning as
the cold upper trough approaches from the northwest. Showers will
then taper off Friday afternoon and evening. The incoming system
will usher a much colder airmass into our area from late tomorrow
through Friday. 850 mb temperatures are forecast to drop from
about 13 deg c at the present time to -2 deg c by Friday morning.

Snow levels will drop as low as 3000 on Friday, but precipitation
will be light and scattered by then, so no more than a dusting of
snow is expected on higher peaks. Isolated thunder is possible
late Thursday night and Friday, mainly over our northern coastal
waters.

Isolated showers may linger into Saturday morning, but for the
most part Saturday should be a dry and cool day as the upper
trough moves off to our southeast and weak shortwave ridging
develops along the california coast. Based on latest model data,
most of Sunday should be dry as well.

The next system arriving from the northwest is expected to spread
rain across our region from late Sunday through early Monday. This
system will move through quickly and is also expected to generate
only light rainfall amounts, except locally moderate in the north
bay.

Yet another fast-moving system is forecast to arrive from the
northwest around the middle of next week.

Aviation (issued by WFO eureka) as of 2:00 pm pst Wednesday... All bay
area terminals showing subtle improvement from this mornings fog and stratus
induced reduction of vsbys and cigs. However the north bay and sfo still
plagued by mfvr conditions with no immediate relief expected but still an
improvement from what was observed earlier this morning. Some challenging
changes expected later this evening and overnight as a weak cold front slowly
migrates across the bay area. Have slowed the timing of rainfall from earlier
forecasts to early Thursday morning for the north bay to late Thursday morning
for oak and sfo. While terminals farther south should not see any significant
rain till thurs afternoon. Challenge is whether low stratus and fog will
redevelop tonight since mid to high cloud cover should be a mitigating factor.

Also, some pre-frontal mixing should aid in maintaining somewhat higher CIGS than
what was observed last night and early this morning. Thus have hedged the next
taf cycle in a more MVFR direction for all sites and only a slight reduction
of vsbys associated with the rainfall. Winds look to remain quite light.

Vicinity of ksfo... MVFR through 22z with vsbys down to 4-6 miles in haze.

At times.

Sfo bridge approach... Similar to ksfo.

Marine As of 8:37 pm pst Wednesday... A large long period
westerly swell generated by a strong low pressure system currently
off the pacific northwest coast will impact the coastal waters
beginning tonight and continuing through the end of the week. This
swell will bring hazardous seas to the region as well as large
breaking waves to the coastline through Friday.

Mtr watches warnings advisories
Tngt High surf warning... Entire coast
sca... Mry bay from 3 am
sca... Pigeon pt to pt pinos 0-10 nm from 3 am
sca... Pt arena to pigeon pt 10-60 nm from 10 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
sca... Pt arena to pt reyes 0-10 nm from 12 am
sca... Rough bar advisory for sf bar
sca... Pt reyes to pigeon pt 0-10 nm from 3 am
public forecast: dykema
aviation: W pi
marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 8 mi54 min NNW 6 G 7 53°F 54°F1021.4 hPa (-0.6)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 9 mi45 min NW 5.1 52°F 1022 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi54 min N 5.1 G 7 55°F 1021.8 hPa (-0.7)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 13 mi54 min E 6 G 7 52°F 1021.3 hPa (-0.9)
FTPC1 - 9414290 - San Francisco, CA 15 mi54 min N 5.1 G 8 52°F 54°F1021.8 hPa (-0.6)
PXSC1 16 mi54 min 54°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 16 mi54 min NW 6 G 8.9 52°F 1020.6 hPa (-0.7)
OBXC1 17 mi54 min 53°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 17 mi54 min NNW 6 G 7 53°F 1021.4 hPa (-0.8)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi54 min NNW 7 G 8.9
46237 - San Francisco Bar, CA (142) 18 mi54 min 54°F8 ft
LNDC1 19 mi72 min N 5.1 G 8 54°F 1021.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi54 min Calm G 4.1 52°F 52°F1021.9 hPa (-0.9)52°F
AAMC1 - 9414750 - Alameda, CA 20 mi54 min N 6 G 8 53°F 55°F1021.5 hPa (-0.8)
PRYC1 - 9415020 - Point Reyes, CA 25 mi54 min S 4.1 G 6 55°F1020.9 hPa (-0.8)
PCOC1 - 9415144 - Port Chicago, CA 25 mi54 min NNW 6 G 7 52°F 52°F1021.8 hPa (-0.7)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi64 min ESE 5.8 G 9.7 51°F 55°F7 ft1021.1 hPa (-1.2)
SFXC1 - San Francisco Bay Reserve, CA 28 mi69 min NW 4.1 51°F 1022 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi60 min S 2.9 G 5.1 54°F 1021.7 hPa
RTYC1 - 9414523 - Redwood City, CA 39 mi54 min NW 1 G 1.9 53°F 56°F1022 hPa (-0.4)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 45 mi44 min ESE 5.8 G 9.7 54°F 56°F1021.6 hPa54°F

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA9 mi59 minN 02.50 miFog/Mist52°F51°F100%1022 hPa
Petaluma Municipal Airport, CA17 mi59 minSSE 32.00 miFog/Mist52°F51°F100%1021.7 hPa
Napa, Napa County Airport, CA18 mi60 minN 04.00 miFog/Mist53°F51°F93%1020.8 hPa
Concord, Buchanan Field, CA24 mi61 minNW 62.50 miFog/Mist54°F53°F97%1020.6 hPa

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmS3CalmCalmCalmS3SE3S4S3S4Calm4CalmCalm3SE5SE5S4S4CalmS3CalmCalm
1 day agoSW3S4CalmCalmCalmCalmCalmS5SE7S4SW3SW6CalmSW3CalmS3SE4S5SW5S4CalmSW4CalmCalm
2 days agoS6SE4S7S5S6S7S8S4S4E4S8SE5CalmS6CalmSE6CalmSE4CalmCalmCalmCalm--Calm

Tide / Current Tables for Gallinas, Gallinas Creek, San Pablo Bay, California
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Gallinas
Click for Map
Thu -- 02:25 AM PST     4.95 feet High Tide
Thu -- 07:13 AM PST     2.58 feet Low Tide
Thu -- 07:23 AM PST     Sunrise
Thu -- 08:24 AM PST     Moonrise
Thu -- 01:02 PM PST     6.07 feet High Tide
Thu -- 05:17 PM PST     Sunset
Thu -- 07:02 PM PST     Moonset
Thu -- 07:50 PM PST     -0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.64.44.94.94.33.62.92.62.73.34.155.76.15.84.93.62.10.7-0.1-0.30.10.92

Tide / Current Tables for Petaluma River Approach #3/#4, San Pablo Bay, California Current
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Petaluma River Approach #3/#4
Click for Map
Thu -- 03:28 AM PST     -0.00 knots Slack
Thu -- 05:43 AM PST     -0.33 knots Max Ebb
Thu -- 07:23 AM PST     Sunrise
Thu -- 07:40 AM PST     0.00 knots Slack
Thu -- 08:23 AM PST     Moonrise
Thu -- 09:49 AM PST     0.58 knots Max Flood
Thu -- 01:37 PM PST     -0.00 knots Slack
Thu -- 05:05 PM PST     -0.91 knots Max Ebb
Thu -- 05:17 PM PST     Sunset
Thu -- 07:02 PM PST     Moonset
Thu -- 08:53 PM PST     0.01 knots Slack
Thu -- 11:28 PM PST     0.61 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.50.30.1-0.1-0.3-0.3-0.20.10.50.60.50.40.1-0.1-0.5-0.8-0.9-0.9-0.7-0.40.10.40.6

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 San Francisco/Monterey Bay Area, CA (0,6,7,8)
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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.