Friday, October18, 2019 L-36.com


Marine Weather and Tides
Muir Beach, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:19AMSunset 6:30PM Friday October 18, 2019 5:10 PM PDT (00:10 UTC) Moonrise 8:55PMMoonset 10:56AM Illumination 72% Phase: Waning Gibbous; Moon at 20 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- 229 Pm Pdt Fri Oct 18 2019
.small craft advisory for rough bar in effect through late tonight...
.small craft advisory in effect through late tonight...
Rest of today..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 9 to 11 ft at 15 seconds and sw around 2 ft at 13 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft at 15 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 16 seconds.
Sat night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 15 seconds.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 6 to 8 ft at 14 seconds and sw around 2 ft at 20 seconds.
Sun night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 5 to 7 ft at 13 seconds and sw around 2 ft at 19 seconds.
Mon..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 4 to 6 ft and sw around 2 ft.
Tue..NW winds 10 to 20 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 9 to 11 ft with a dominant period of 15 seconds. Across the bar...seas 10 to 13 ft with a dominant period of 15 seconds. Maximum ebb current of 3.6 kt at 07:31 pm Friday and 0.9 kt at 09:13 am Saturday.
PZZ500 229 Pm Pdt Fri Oct 18 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Predominately light to locally moderate northwest winds the rest of today and through the weekend. The strongest winds will be concentrated along the big sur coast. The northwest swell will peak today and then begin to subside this evening with hazardous seas for smaller vessels continuing into this weekend.


7 Day Forecast for Marine Location Near Muir Beach, CA
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location: 37.78, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 182217
afdmtr
area forecast discussion
national weather service san francisco bay area
317 pm pdt Fri oct 18 2019

Synopsis Today will be another cool day for the bay area
before another weak front moves through late this evening. Winds
will be breezy as the front passes and there is a slight chance of
rain with minimal accumulations for the north bay late tonight
into Saturday morning. Temperatures will gradually warm over the
weekend before a more robust warming trend early next week along
with offshore flow.

Discussion As of 1:39 pm pdt Friday... Under partly cloudy
skies, afternoon temperatures are running similar to those from 24
hours ago with readings in the mid 60s to the lower 70s. Satellite
imagery shows high clouds moving across the bay area southward, as
well as some cumulus forming over higher peaks, and coastal
stratus from marin county south to the monterey peninsula.

Tonight a weak frontal boundary is forecast to bring rain
chances to mainly the north bay overnight and into Saturday
morning. Only a few hundredths of an inch at most can be expected,
and mainly in the extreme northern portions of sonoma and napa
counties. In addition, the passing boundary could result in an
increase in offshore flow across the santa lucia mountains. These
winds are not forecast to be overly strong, but with low humidity
it raises the concerns for a fire threat (see fire discussion
below).

Onshore flow will persist Saturday and Sunday under a strong
northwest flow. 500 mb heights will slowly rise for gradually
warming temps over the weekend. By Monday, the upper level ridge
will continue to grow and shift eastward towards the coast,
initiating a much more substantial warming trend expected to last
through the middle of the week. High temps should level off by
Wednesday. However, while temperatures warm into the mid to upper
80s at the surface, the wind pattern shifts by Tuesday to a more
widespread, offshore pattern, increasing the potential for
possible fire weather issues through Thursday.

Aviation As of 10:55 am pdt Friday... For 18z tafs. Previous
model runs underestimated development of low clouds in moist
lower levels but latest WRF core models show low level
moisture clouds lingering through the morning most of the
afternoon across the region today, in addition to the high clouds.

Some brief improvements possible later today however deepening low
level moisture may bring borderline ifr MVFR CIGS overnight, but
showing improvement by Saturday morning. Breezy to occasionally
gusty onshore winds today, however, noticeably weaker than
yesterday. Low to moderate confidence forecast given wildly
different model output and air mass shift in progress.

Vicinity of ksfo... Air mass boundary advecting in lower level
moisture is producing stratocumulus at around 2500 to 3500 ft as
of 1730z and will continue to do so through the day. Breezy
onshore winds 13-16kt with gusts into the low 20kts possible
today. Low confidence on ceilings from this evening through
tomorrow morning given sufficient low level moisture to force at
least few-sct low level clouds into sunrise Saturday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR with some increasing high clouds
into the early to mid afternoon. Then, models show increasing low
level moisture that may early support arrival of low clouds as
early as 00-01z for kmry ksns, as tafs reflect. Low clouds mix
out by sunrise Saturday. Low confidence.

Fire weather As of 3:05 pm pdt Friday... Two main fire weather
concerns over the next seven days. The first impact will be
focused tonight over the higher terrain of the santa lucia
mountains. Hi-res WRF model continues to show a localized
offshore flow scenario tonight with N to NE winds 25-35 mph with
poor humidity recovery. The second impact will be focused on next
week. High pressure is forecast to build starting Sunday Monday
and continue through much of the next week with a warming and
drying trend. More importantly, offshore flow is forecast to
develop on Monday and increase each day before peaking Wednesday
night Thursday morning. Latest GFS continues to show a robust
15mb+ sfo-wmc... That being said the ECMWF isn't as strong. None
the less, this situation next week needs watching. Even if the
strength of the wind doesn't verify rh will be low by night number
three. Stay tuned... .

Marine As of 10:48 am pdt Friday... Light to locally moderate
northwest winds are forecast to prevail over the coastal waters
through the day and into the weekend. The strongest winds will be
concentrated along the big sur coast. The northwest swell will
peak today and then begin to subside this evening with hazardous
seas for smaller vessels continuing into Saturday.

Mtr watches warnings advisories
Tngt High surf advisory... Caz006-505-509-529-530
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pt reyes 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... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Rough bar advisory for sf bar until 3 am
public forecast: sims
aviation: drp
marine: drp
fire weather: mm
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 2 mi40 min 55°F9 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi40 min WNW 12 G 16 57°F 56°F1018.9 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi58 min W 8 G 14 58°F 56°F1018.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi35 min SSW 7 62°F 1017 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi52 min WSW 9.9 G 18 62°F 1016.9 hPa
PXSC1 15 mi52 min 61°F 54°F
RCMC1 - 9414863 - Richmond, CA 17 mi52 min 60°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi58 min W 16 G 18
OBXC1 18 mi52 min 60°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi52 min W 14 G 19 60°F 1017.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi52 min WSW 7 G 12 64°F 1017.9 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi58 min W 12 G 16 62°F 62°F1018.4 hPa
LNDC1 21 mi52 min W 12 G 17 62°F 1017.8 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi52 min 54°F1018.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi52 min W 8.9 G 13 66°F 1017.1 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi52 min WNW 14 G 17 64°F 65°F1018.8 hPa
UPBC1 34 mi52 min WNW 14 G 18
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi52 min W 13 G 15 63°F1017.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi52 min W 15 G 18 64°F1017.2 hPa
46214 - Point Reyes, CA (029) 44 mi40 min 55°F12 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi52 min NW 13 G 17 1016.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi85 min W 12 69°F 1017 hPa46°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi40 min WNW 14 G 18 53°F1017.8 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA20 mi14 minW 1810.00 miA Few Clouds and Breezy63°F48°F58%1017.9 hPa
Half Moon Bay Airport, CA21 mi15 minNW 84.00 miFair with Haze59°F55°F88%1019 hPa
Oakland, Metro Oakland International Airport, CA24 mi17 minW 1710.00 miA Few Clouds65°F48°F56%1017.8 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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1 day agoW10NW7N4NW5W10W6NW3W5W8W5CalmW11W8W13W13W19
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2 days agoW18W18W17W11W8W9W8W10W7W5W7W7W7W7NW5W6W9W8W6W10NW11W14W14W13

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Fri -- 03:17 AM PDT     4.16 feet High Tide
Fri -- 07:21 AM PDT     Sunrise
Fri -- 07:55 AM PDT     2.88 feet Low Tide
Fri -- 11:56 AM PDT     Moonset
Fri -- 02:03 PM PDT     5.34 feet High Tide
Fri -- 06:29 PM PDT     Sunset
Fri -- 08:54 PM PDT     0.12 feet Low Tide
Fri -- 09:54 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.63.33.94.14.13.83.332.93.13.54.14.75.15.35.14.53.42.21.10.30.10.41

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 12:38 AM PDT     1.22 knots Max Flood
Fri -- 04:32 AM PDT     -0.00 knots Slack
Fri -- 06:44 AM PDT     -0.89 knots Max Ebb
Fri -- 07:21 AM PDT     Sunrise
Fri -- 09:18 AM PDT     0.00 knots Slack
Fri -- 11:55 AM PDT     Moonset
Fri -- 12:26 PM PDT     0.81 knots Max Flood
Fri -- 03:24 PM PDT     -0.01 knots Slack
Fri -- 06:28 PM PDT     Sunset
Fri -- 06:57 PM PDT     -1.65 knots Max Ebb
Fri -- 09:54 PM PDT     Moonrise
Fri -- 10:23 PM PDT     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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1.21.210.70.3-0.3-0.8-0.9-0.6-0.10.20.60.80.80.50.2-0.3-0.9-1.4-1.7-1.4-0.8-0.20.3

Weather Map
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wmap_P
GEOS 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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Other links: Northern Pacific     Contential US     Full GOES-East
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.