Friday, December14, 2018 L-36.com


Marine Weather and Tides
Bolinas, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:16AMSunset 4:54PM Friday December 14, 2018 5:54 PM PST (01:54 UTC) Moonrise 12:21PMMoonset 11:49PM Illumination 50% Phase: First Quarter Moon; Moon at 7 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 243 Pm Pst Fri Dec 14 2018
.small craft advisory for rough bar in effect through late Saturday night...
Tonight..N winds 5 to 15 kt...becoming southeast after midnight. Wind waves 2 ft or less. W swell 8 to 13 ft at 15 seconds. Showers likely, mainly this evening.
Sat..SE winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 8 to 13 ft at 15 seconds and S around 2 ft at 13 seconds. A chance of showers.
Sat night..S winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 6 to 9 ft at 13 seconds and S around 2 ft at 12 seconds. A chance of showers.
Sun..S winds 20 to 30 kt with gusts up to 40 kt. Wind waves 4 to 7 ft. W swell 6 to 10 ft at 17 seconds and S around 2 ft at 12 seconds. Rain.
Sun night..S winds 20 to 30 kt with gusts up to 40 kt. Wind waves 4 to 7 ft. W swell 13 to 18 ft at 21 seconds and S around 2 ft at 12 seconds. Rain.
Mon..E winds 5 to 10 kt. Wind waves 2 ft or less. W swell 15 to 19 ft and S around 2 ft.
Mon night..NW winds up to 10 kt. Wind waves 2 ft or less. W swell 12 to 17 ft and S around 2 ft.
Tue..SE winds around 5 kt. Wind waves 2 ft or less. W swell 9 to 12 ft and S around 2 ft.
Wed..NE winds around 5 kt. Wind waves 2 ft or less. W swell 10 to 15 ft and S around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 9 to 11 ft with a dominant period of 15 seconds. Across the bar...combined seas 12 to 14 ft with a dominant period of 15 seconds. Maximum ebb current of 1.6 knots at 09:25 pm Friday and 1.4 knots at 10:55 am Saturday.
PZZ500 243 Pm Pst Fri Dec 14 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A moderate west to northwest swell will build tonight and result in hazardous conditions through Saturday. Winds will become fairly light tonight as a weak frontal boundary stalls over the region. Southerly winds will increase late Saturday night into Sunday ahead of the next storm system to impact the region. A larger, more powerful long period west to northwest swell will build Sunday into Monday and result in hazardous conditions into early next week.


7 Day Forecast for Marine Location Near Bolinas, CA
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location: 37.67, -123.15     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 150023
afdmtr
area forecast discussion
national weather service san francisco bay area
423 pm pst Fri dec 14 2018

Synopsis A weak weather system will produce light rain across
the sf bay area into this evening. Scattered showers continue
Saturday across the north bay. A stronger wetter system impacts
the area Sunday. A very large wave train arrives late Sunday into
Monday. A return to dry weather is expected late Monday.

Discussion As of 03:00 pm pst Friday... A pair of storm systems
will bring unsettled weather to the region through the coming
days. The first of these two storm systems first arrived earlier
today bringing gusty southerly winds up to 50 mph over the higher
terrain and continues to encroach on the region from the
northwest this afternoon. A north to south line of light pre
frontal showers developed along the air mass boundary of the warm
sector earlier today, however, these high based showers promptly
fizzled upon moving over the santa cruz mountains and diablo
range bringing only spotty accumulations of a few hundredths. The
southern tail of the main frontal rain band is now moving across
the north bay, bringing reports of brief heavy at the santa rosa
airport. As of 215pm, precipitation accumulations have been
primarily confined to the sonoma coast and coastal range, with
just under half of an inch being reported near both monte rio and
gualala. Additional accumulations are anticipated through the
coming hours across the san francisco bay area.

Confidence is high that the surface frontal boundary will continue
to move towards san francisco and oakland over the remainder of
the daylight hours. From there, the surface frontal boundary will
stall out as the upper level support pulls away and lifts towards
idaho, leaving behind a stalled frontal boundary over the
northern san francisco bay and a moisture rich air mass overhead
of the broader region. The main precipitation band will rapidly
deteriorate through the evening and it is possible there will be a
few hours of little to no activity on the radar around midnight.

Short models then agree that a weak secondary pulse will pass over
the region late tonight into tomorrow morning, which will provide
just enough lift to kickstart the shower activity over the north
bay tomorrow.

A potent storm system is forecast to impact the forecast area
throughout Sunday with lingering showers into Sunday night and
early Monday. This storm system is accompanied by a fairly moist
air mass in the range of around 1.20-1.30" pwats and also has the
potential to tap into the additional lingering moisture orphaned
by tonights storm system. Thus, there is the potential for
moderate to locally heavy rainfall, primarily over the north bay
and isolated sections of the santa cruz and santa lucia ranges on
the order of up to 2.00-3.00". Elsewhere, widespread rain of 0.50
to 1.00" is expected to fall regionwide, with locally higher
amounts in the north bay valleys and locally lower amounts in the
typical rain shadowed portions of the santa clara and salinas
valley. Generally speaking, this should come as another round of
beneficial rain with only minor nuisance ponding of water and
nuisance flooding in prone paved low lying areas. In addition to
rain, southerly winds will become gusty ahead of the system,
especially along the coast and over the higher terrain.

In addition to the rain and wind, this storm system will be
responsible for bringing the largest waves so far this season to
the coast from late Sunday through Monday. A high surf warning has
been issued and is in effect from 9am Sunday through 9pm Monday.

The earlier start time accounts for the arrival of the very long
forerunner waves which present a significantly increased risk of
rip currents and sneaker waves. Please review the beaches section
for more information about the upcoming high surf event.

Aviation As of 4:15 pm pst Friday... A mix ofVFR-MVFR
conditions expected to continue as visibilities and cloud bases
remain lower in association with a weak frontal boundary
now essentially stalled over the sf bay area. Winds will continue
generally light and southerly, though locally a bit stronger and
gustier vicinity central portions of sf bay through early this
evening. Light rain and briefly lower ceilings are possible across
the san francisco bay area terminals through mid-evening.VFR
conditions are more likely to persist for the monterey bay
terminals as the frontal boundary remains stalled to the north.

Vicinity of ksfo...VFR conditions expected to generally prevail
through the evening rush, though ceilings and visibilities may
temporarily reduce to MVFR with a passing shower. Southerly
winds to 15 to 20 kt through the early evening hours, then light
out of the southeast. Moderate confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions to persist with mid level
cloud deck expected to continue over the region. Can't entirely rule
out the possibility of a passing shower, which could briefly
reduce ceilings and visibilities to MVFR. Moderate confidence.

Beaches As of 03:09 pm pst Friday... A potent storm system
passing south of aleutian islands will move nearly due east over
the coming days. This eastward trajectory will create a dynamic
fetch zone where the strongest winds of the storm system will
continuously increase the energy within a swell train on the
southern flank of the storm, resulting in a very large, long
period wnw wave train aimed at the california coast. Very long
period forerunners will arrive through the day Sunday and will
bring a significantly increased risk of rip currents and sneakers
waves to the coast. The largest waves are then forecast to arrive
Sunday night through Monday morning, with peak swells of 17 to 21
ft at 19 to 21 seconds currently expected. Large breaking waves of
25 to 40 ft will be possible at west and northwest facing
locations, with breakers up to or exceeding 50 ft at favored break
points along the coast. As a result, a high surf warning has been
issued from 9 am Sunday through 9 pm Monday along the entire
coastline.

Marine As of 03:09 pm pst Friday... A moderate west to
northwest swell will build tonight and result in hazardous
conditions through Saturday. Winds will become fairly light
tonight as a weak frontal boundary stalls over the region.

Southerly winds will increase late Saturday night into Sunday
ahead of the next storm system to impact the region. A larger,
more powerful long period west to northwest swell will build
Sunday into Monday and result in hazardous conditions into early
next week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Rough bar advisory for sf bar
sca... Mry bay until 5 pm
sca... Sf bay until 9 pm
public forecast: drp
aviation: blier
marine beaches: rgass
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi45 min SSE 5.8 G 7.8 54°F 57°F1019.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 24 mi55 min 56°F1018.9 hPa (+1.5)
46214 - Point Reyes, CA (029) 26 mi55 min 58°F13 ft
46237 - San Francisco Bar, CA (142) 28 mi55 min 57°F8 ft
FTPC1 - 9414290 - San Francisco, CA 37 mi61 min W 5.1 G 11 55°F 56°F1019.4 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 40 mi45 min E 7.8 G 12 57°F1018.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi50 min SE 1.9 54°F 1019 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi55 min NNW 2.9 G 4.1 57°F 1018.3 hPa (+1.4)
PXSC1 41 mi61 min 58°F 56°F
RCMC1 - 9414863 - Richmond, CA 43 mi55 min 56°F
OBXC1 44 mi55 min 57°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi55 min SSW 11 G 13
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi55 min SW 7 G 8 57°F 1019.3 hPa (+1.4)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 45 mi55 min SW 11 G 15 55°F 1019.6 hPa (+1.2)
AAMC1 - 9414750 - Alameda, CA 46 mi61 min SE 2.9 G 6 56°F 55°F1019.6 hPa
LNDC1 47 mi55 min S 7 G 9.9 57°F 1019.3 hPa (+1.4)

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA42 mi2 hrsS 12 G 208.00 miLight Rain56°F52°F87%1018.7 hPa

Wind History from SFO (wind in knots)
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Last 24hrNE9CalmSE3CalmCalmCalmS3S3CalmCalmW3NE8NE8SE4E3E6E6S17
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1 day agoW10W8W11CalmCalmS4CalmCalmCalmCalmCalmS3S3S3S3NE7E3CalmCalmCalmE4NE4N6NE7
2 days agoSW6W11W12W11NW11W8W11NW7W6NW8NE33E7CalmNE13NE8NE13NE8NE7NE35W14W10W11

Tide / Current Tables for Southeast Farallon Island, California
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Southeast Farallon Island
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Fri -- 04:34 AM PST     4.59 feet High Tide
Fri -- 07:19 AM PST     Sunrise
Fri -- 10:41 AM PST     2.93 feet Low Tide
Fri -- 12:20 PM PST     Moonrise
Fri -- 03:20 PM PST     3.92 feet High Tide
Fri -- 04:54 PM PST     Sunset
Fri -- 10:12 PM PST     0.88 feet Low Tide
Fri -- 11:48 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.63.54.14.54.64.443.63.232.93.13.43.73.93.93.532.31.61.10.91

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Fri -- 02:11 AM PST     0.82 knots Max Flood
Fri -- 05:39 AM PST     -0.00 knots Slack
Fri -- 07:20 AM PST     Sunrise
Fri -- 07:58 AM PST     -0.64 knots Max Ebb
Fri -- 11:56 AM PST     0.00 knots Slack
Fri -- 12:21 PM PST     Moonrise
Fri -- 02:16 PM PST     0.43 knots Max Flood
Fri -- 04:53 PM PST     Sunset
Fri -- 04:58 PM PST     -0.00 knots Slack
Fri -- 08:02 PM PST     -0.89 knots Max Ebb
Fri -- 11:48 PM PST     Moonset
Fri -- 11:52 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.70.80.80.60.3-0.2-0.5-0.6-0.5-0.4-0.200.30.40.40.2-0-0.4-0.7-0.9-0.8-0.5-0.3

Weather Map and Satellite Images
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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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.