Monday, March25, 2019 L-36.com


Marine Weather and Tides
Muir Beach, 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 7:04AMSunset 7:27PM Monday March 25, 2019 4:48 PM PDT (23:48 UTC) Moonrise 11:53PMMoonset 9:22AM Illumination 75% 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- 214 Pm Pdt Mon Mar 25 2019
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt...becoming north around 5 kt after midnight. Wind waves 3 to 4 ft this evening...becoming 2 ft or less. W swell 6 to 8 ft at 13 seconds and sw around 1 ft at 17 seconds. A chance of showers, mainly this evening.
Tue..SE winds up to 10 kt. Wind waves 2 ft or less. W swell 6 to 8 ft at 14 seconds and sw 1 to 3 ft at 16 seconds. A slight chance of showers.
Tue night..S winds 10 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 13 seconds and sw 1 to 2 ft at 19 seconds. Showers.
Wed..SW winds 10 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 4 to 7 ft at 13 seconds and sw 1 to 2 ft at 19 seconds. Showers and a slight chance of Thunderstorms.
Wed night..SW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 5 ft. W swell 7 to 9 ft at 12 seconds and sw 1 to 2 ft at 18 seconds. A chance of showers.
Thu..W winds 10 to 15 kt. Wind waves 2 ft or less. W swell 6 to 7 ft at 11 seconds and sw 1 to 2 ft at 17 seconds. A chance of showers.
Thu night..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 5 to 6 ft at 15 seconds and sw 1 to 2 ft at 17 seconds.
Fri..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 3 to 6 ft and sw 1 to 3 ft.
Sat..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft and sw around 1 ft. Winds and wind waves higher in and near Thunderstorms.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 6 to 8 ft with a dominant of 14 seconds. Across the bar...combined seas 7 to 9 ft with a dominant period of 14 seconds. Maximum ebb current of 1.7 kt at 09:19 pm Monday and 3.0 kt at 08:37 am Tuesday.
PZZ500 214 Pm Pdt Mon Mar 25 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low pressure off the oregon coast will keep light to moderate southerly winds through Tuesday night. Stronger winds can be expected over the central waters this evening and over the northern waters Tuesday night. Winds will switch to southwest on Wednesday and Thursday as high pressure builds off the california coast.


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 252051
afdmtr
area forecast discussion
national weather service san francisco bay area
151 pm pdt Mon mar 25 2019

Synopsis A weak front will pass through the area this evening
with light rain showers. The front will stall over the south bay
and central coast on Tuesday keeping a chance of showers in the
forecast for southern areas. The next front will push into the
area later Tuesday night into early Wednesday with another
organized chance of rain. Shower and isolated thunderstorms will
be possible Wednesday before ending by Thursday. Drying trend
Friday into the weekend.

Discussion As of 1:51 pm pdt Monday... A frontal boundary is
weakening as it passes through the bay area this afternoon and
evening. Showers will continue to impact the afternoon evening
commute but mainly be light to occasionally moderate in intensity.

Shower activity will decrease this evening and overnight. The
surface boundary will wash out over the south bay and central
coast by early Tuesday morning.

As the main upper trough approaches on Tuesday, there may be
sufficient upper lift divergence over the left over surface
boundary to allow for more showers to develop on Tuesday. In
contrast to today the best chances will be from the far east bay
counties through the south bay and around the central coast in the
vicinity of the surface moisture boundary. The NAM model remains
most bullish on generating showers Tuesday while the ECMWF and gfs
are drier.

Rain chances will then increase again later Tuesday night into
weds, especially across the north bay as another surface front
approaches the region. This will lead to increased shower chances
right through weds morning. Enough cold air aloft by weds to allow
thunderstorm chances be put into the forecast (as inherited from
overnight shift).

The parent upper low responsible for all the shower chances the
next few days will finally move onshore late weds night into
Thursday morning. Precip chances should rapidly end by late
Thursday afternoon and evening. For all the talk of showers the
next few days, amounts in general look to be light with some
portions of interior monterey san benito potentially seeing no
rainfall at all. Daytime highs will be on the cool side of normal
with cloud cover and cool temps aloft. However, any peaks of
sunshine will allow temps to jump into the 60s most days.

High pressure to build Friday into the weekend with dry and mild
weather. Storm track remains somewhat active next week but right
now the best precip chances remain north of i-80.

Aviation As of 10:45 am pdt Monday... For 18z tafs. Frontal
boundary will progress southward through sf monterey bay areas
through the TAF period. Ese to SE winds will prevail initially
this morning and gradually increase ahead of approaching storm
system. Winds will gradually veer towards the S as the front nears
before shifting to the SW in the wake of the front. Breezy winds
of 10-15kt are possible with gusts up to around 25kt as frontal
passage nears. Rain should generally be on the lighter side and
turn showery as the frontal boundary weakens, slows, and
fractures later today and tonight. CIGS generally borderline
MVFR toVFR, dropping as low as around 1500-2000 ft. Some slight
clearing in wake of passage however another round of backing winds
and rain should be expected by midday tomorrow.

Vicinity of ksfo... Gradually lowering CIGS becoming MVFR along
with increasing shower chances through the next several hours.

Wind gusts 20-25 kt late this morning before winds gradually shift
out of the W SW later today in wake of frontal passage. Shower
chances will diminish into this evening as the front moves
through. A second round of backing winds and rain expected by the
end of the TAF period.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR with locally gusty SE winds in the
salinas valley through midday. Weakening front may stall near the
terminals, which will bring a prolonged period of
-shra vcsh to kmry ksns beginning later today (late aft early eve)
and persisting through early Tuesday.

Marine As of 9:00 am pdt Monday... A storm system is moving
southward across the waters today and will bring gusty southerly
winds ahead of the front. These winds may bring locally steep
fresh swell to the waters. Winds will weaken and turn westerly in
the wake of the front. After a brief break, expect winds to
increase again Tuesday night. Moderate west to northwest swell
will continue through the week.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 9 pm
sca... Pt reyes to pigeon pt 0-10 nm until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 9 pm
sca... Pt arena to pt reyes 0-10 nm until 3 pm
sca... Pt arena to pigeon pt 10-60 nm until 3 pm
sca... Mry bay until 4 pm
sca... Pt pinos to pt piedras blancas 0-10 nm until 4 pm
public forecast: rww
aviation: drp
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 2 mi49 min 55°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi29 min S 18 G 21 55°F 55°F1018.5 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi49 min SSW 8 G 16 56°F 56°F1018.4 hPa (+0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi44 min SSE 8.9 56°F 1018 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi49 min ESE 6 G 8.9 56°F 1017 hPa (+0.0)
PXSC1 15 mi49 min 57°F 57°F
RCMC1 - 9414863 - Richmond, CA 17 mi55 min SSE 5.1 G 8.9 56°F 57°F1017.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi49 min S 8.9 G 12
OBXC1 18 mi49 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi49 min S 7 G 11 56°F 1018.1 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi49 min S 13 G 14 56°F 1018.3 hPa (+0.0)
AAMC1 - 9414750 - Alameda, CA 20 mi55 min S 8.9 G 11 56°F 58°F1018.5 hPa
LNDC1 21 mi49 min SSW 8 G 12 56°F 1018.1 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 22 mi49 min 56°F1018.2 hPa (+0.4)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi49 min SW 8.9 G 12 57°F 1017.7 hPa (+0.0)
RTYC1 - 9414523 - Redwood City, CA 31 mi49 min S 8 G 13 61°F 60°F1018.3 hPa (-0.7)
UPBC1 34 mi49 min WSW 2.9 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi49 min SSW 6 G 8 57°F 57°F1018 hPa (+0.0)57°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi49 min SW 6 G 15 57°F 57°F1018 hPa (+0.0)
46214 - Point Reyes, CA (029) 44 mi49 min 55°F9 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi49 min WNW 8.9 G 13 58°F 1017.6 hPa (+0.0)
SFXC1 - San Francisco Bay Reserve, CA 45 mi64 min SW 8.9 58°F 1018 hPa53°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi29 min W 7.8 G 12 55°F1018.3 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 mi53 minESE 52.00 miLight Rain Fog/Mist55°F53°F93%1017.8 hPa
Half Moon Bay Airport, CA21 mi54 minS 15 G 221.00 miLight Rain55°F51°F88%1018.6 hPa
Oakland, Metro Oakland International Airport, CA24 mi56 minSW 93.00 miLight Rain Fog/Mist58°F57°F97%1018 hPa

Wind History from SFO (wind in knots)
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Last 24hrW9SW7SW4S9S8SE7SW6S9S7S5E8SE5E3S3SE6SE5S15SE8SE19SE17S15
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1 day agoW16W12W13W8W6W64NW3S5S4SW3CalmCalmS5W4S5SE5SE3NE4NE5NE6NE3N3NE5
2 days agoE9SE10SE6SE7S6
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G21

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Mon -- 02:38 AM PDT     5.64 feet High Tide
Mon -- 07:06 AM PDT     Sunrise
Mon -- 09:13 AM PDT     0.05 feet Low Tide
Mon -- 10:21 AM PDT     Moonset
Mon -- 04:06 PM PDT     4.22 feet High Tide
Mon -- 07:27 PM PDT     Sunset
Mon -- 09:11 PM PDT     2.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.155.55.65.14.12.71.40.50.10.20.81.62.53.444.24.13.632.52.32.42.9

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Mon -- 12:34 AM PDT     1.07 knots Max Flood
Mon -- 03:53 AM PDT     -0.00 knots Slack
Mon -- 06:55 AM PDT     -1.66 knots Max Ebb
Mon -- 07:06 AM PDT     Sunrise
Mon -- 10:20 AM PDT     Moonset
Mon -- 10:36 AM PDT     0.01 knots Slack
Mon -- 01:36 PM PDT     1.23 knots Max Flood
Mon -- 05:21 PM PDT     -0.01 knots Slack
Mon -- 07:26 PM PDT     Sunset
Mon -- 07:29 PM PDT     -0.87 knots Max Ebb
Mon -- 10:41 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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110.80.5-0.1-0.8-1.5-1.7-1.4-1-0.40.30.81.21.210.70.2-0.4-0.8-0.8-0.6-0.30.1

Weather Map and Satellite Images
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wmap_P
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 (19,4,5,8)
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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.