Wednesday, January17, 2018 L-36.com


Marine Weather and Tides
Tomales, 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 7:23AMSunset 5:18PM Wednesday January 17, 2018 5:39 PM PST (01:39 UTC) Moonrise 7:48AMMoonset 6:08PM 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 1253 Pm Pst Wed Jan 17 2018
Tonight..SE winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 8 to 10 ft at 14 seconds. Chance of rain through the night.
Thu..SW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 18 to 21 ft at 18 seconds. Rain likely in the morning, then chance of rain in the afternoon.
Thu night..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 17 to 20 ft at 16 seconds. Rain likely in the evening, then showers likely and slight chance of Thunderstorms after midnight.
Fri..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 15 to 18 ft at 15 seconds. Showers likely in the morning. Slight chance of Thunderstorms through the day. Chance of showers in the afternoon.
Fri night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 16 to 19 ft. Chance of showers in the evening, then slight chance of showers after midnight.
Sat..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 14 to 17 ft. Slight chance of rain.
Sun..S winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 10 to 13 ft. Rain, then rain likely.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 12 to 15 ft...decreasing to 9 to 10 ft. Chance of showers, then slight chance of showers.
PZZ500 230 Pm Pst Wed Jan 17 2018 Corrected
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure to the southwest will continue to shift south as a low pressure system approaches the pacific northwest. A frontal system associated with the low will move through the area on Thursday. Gusty southerly will form through tonight, then shift quickly to westerly on Thursday, before becoming northwesterly by Friday. A large long-period swell will bring dangerous breaking waves to the coastline tonight through at least Friday. Dense fog with low visibility will impact some areas today. The combination of gusty southerly winds ahead of the cold front followed by building seas will continue to bring small craft advisory (sca) conditions for the outer waters north of point reyes through at least Thursday night. The rest of the outer waters will likely experience sca conditions due to building seas Thursday.

7 Day Forecast for Marine Location Near Tomales, CA
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location: 38.19, -122.92     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 172230 cca
afdmtr
area forecast discussion... Corrected
national weather service san francisco bay area
issued by national weather service los angeles oxnard ca
230 pm pst Wed jan 17 2018
corrected marine discussion

Synopsis High clouds will continue to increase ahead of an
approaching cold front tonight. Light rain will start in the
north bay Thursday morning and then spread southward through the
bay area and central coast by Thursday evening. Rain will quickly
turn to showers Thursday night into Friday as much colder air
settles over the region. Saturday morning will start out chilly
but skies should be mostly clear and dry for the start of the
weekend. The next front approaches later Sunday into Monday with
the next chance of rain.

Discussion As of 01:45 pm pst Wednesday... Despite mid and high
level clouds being thinner than expected high temperatures look
to be near or slightly below forecasted values. This is likely due
to persistent marine layer influence at lower elevations with
stubborn low clouds and fog across many valley locations
especially near and north of the bay area. Increasing
southwesterly flow ahead of the cold front should support
deepening of the marine layer this evening. So fog, at least at
lower elevations, should be limited tonight. Showers along and
ahead of the cold front will likely develop late tonight into
early Thursday near and to the north of the bay area. The front
will rapidly dissipate while pushing through the remainder of the
forecast area through Thursday evening. Meanwhile post frontal
showers, more sporadic in nature will develop in the cold air mass
behind the front. The shower activity will generally diminish
through Friday evening as the core of the cold air mass and
associated instability shift into southern california. Rainfall
amounts is expected to be generally be between one tenth and one
half inch, except locally around three quarters of an inch for
coastal slopes near point arena. Despite breaks in the clouds
Friday and additional sunshine for the weekend temperatures will
remain in the 50s with 40s at higher elevations. Chilly overnight
low are also expected during this time with patchy frost possible
in the coldest interior valleys. Breezy northerly winds behind the
low pressure system late Thursday through Saturday will make it
feel even cooler.

Temperatures are expected to rebound somewhat Sunday into Monday
ahead of a second low pressure system expected to move into the
region Monday. This system currently looks to be less amplified
than the one currently approaching the pacific northwest, which
typically results in a weaker system... Especially for areas south
of the bay area. Model guidance continues to be in above average
agreement for the middle of next week when a third low pressure
system may also approach from the northwest, bringing an
additional chance of rain to the region.

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 2:30 pm pst Wednesday... High pressure to the
southwest will continue to shift south as a low pressure system
approaches the pacific northwest. A frontal system associated
with the low will move through the area on Thursday. Gusty
southerly will form through tonight, then shift quickly to
westerly on Thursday, before becoming northwesterly by Friday. A
large long-period swell will bring dangerous breaking waves to
the coastline tonight through at least Friday. Dense fog with low
visibility will impact some areas today. The combination of gusty
southerly winds ahead of the cold front followed by building seas
will continue to bring small craft advisory (sca) conditions for
the outer waters north of point reyes through at least Thursday
night night. The rest of the outer waters will likely experience
sca conditions due to building seas Thursday.

Mtr watches warnings advisories
Tngt High surf warning... Caz006-505-509
high surf warning... Caz529-530
sca... Pt arena to pigeon pt 10-60 nm
sca... Rough bar advisory for sf bar until 9 pm
public forecast: rm
aviation: W pi
marine: rm
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 14 mi52 min 55°F1022.4 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 21 mi50 min S 5.8 G 7.8 55°F 56°F9 ft1023 hPa54°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi50 min W 7.8 G 9.7 52°F 55°F7 ft1022.6 hPa (-0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 32 mi51 min NW 6 53°F 1023 hPa (-1.0)
46237 - San Francisco Bar, CA (142) 32 mi70 min 54°F8 ft
RCMC1 - 9414863 - Richmond, CA 33 mi52 min 54°F1022.2 hPa
46214 - Point Reyes, CA (029) 34 mi40 min 57°F8 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 35 mi52 min 57°F 1022.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 36 mi52 min 53°F 1022.4 hPa
FTPC1 - 9414290 - San Francisco, CA 36 mi52 min 54°F1022.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 39 mi52 min 55°F 1021.5 hPa
PXSC1 39 mi52 min 56°F 56°F
OBXC1 41 mi52 min 55°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 41 mi52 min 54°F 1022.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 41 mi70 min NNW 8.9 G 12
LNDC1 43 mi52 min 56°F 1022.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi52 min 53°F 52°F1022.9 hPa53°F
AAMC1 - 9414750 - Alameda, CA 44 mi52 min 55°F1022.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 47 mi115 min ESE 2.9 53°F 1023 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 48 mi52 min 53°F 52°F1022.6 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA17 mi45 minno data5.00 miFog/Mist54°F53°F100%1023 hPa
Novato / Gnoss Field, CA20 mi45 minN 03.00 miFog/Mist54°F51°F94%1023.4 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi47 minSW 44.00 miFog/Mist55°F53°F93%1021.7 hPa

Wind History from O69 (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE43SE8SE5SE6CalmS6SE65
G11
4Calm
1 day agoCalmE3CalmCalmCalmS4CalmCalmSE4CalmCalmCalmSE3SE8SE5S6S6CalmCalmCalmCalmSE5S7S4
2 days agoE5CalmE5E9Calm3E5E53SE44
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Tide / Current Tables for Blakes Landing, Tomales Bay, California
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Blakes Landing
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Wed -- 01:09 AM PST     4.15 feet High Tide
Wed -- 06:27 AM PST     2.31 feet Low Tide
Wed -- 07:26 AM PST     Sunrise
Wed -- 07:47 AM PST     Moonrise
Wed -- 11:40 AM PST     5.22 feet High Tide
Wed -- 05:17 PM PST     Sunset
Wed -- 06:08 PM PST     Moonset
Wed -- 07:08 PM PST     -0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.84.143.63.12.62.32.42.93.64.55.15.24.84.131.80.7-0-0.3-0.10.61.52.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Wed -- 12:51 AM PST     -0.00 knots Slack
Wed -- 02:58 AM PST     -0.63 knots Max Ebb
Wed -- 06:13 AM PST     0.00 knots Slack
Wed -- 07:26 AM PST     Sunrise
Wed -- 07:47 AM PST     Moonrise
Wed -- 09:01 AM PST     0.74 knots Max Flood
Wed -- 11:49 AM PST     -0.00 knots Slack
Wed -- 03:06 PM PST     -1.38 knots Max Ebb
Wed -- 05:18 PM PST     Sunset
Wed -- 06:08 PM PST     Moonset
Wed -- 07:07 PM PST     0.00 knots Slack
Wed -- 10:05 PM PST     1.02 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.4-0.1-0.5-0.6-0.5-0.3-0.10.30.60.70.60.4-0.1-0.7-1.2-1.4-1.3-1-0.6-0.10.50.910.9

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 (20,4,5,8)
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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.