Wednesday, September26, 2018 L-36.com


Marine Weather and Tides
Inverness, CA

Version 3.4
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9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 7:01AMSunset 7:01PM Wednesday September 26, 2018 3:44 AM PDT (10:44 UTC) Moonrise 7:21PMMoonset 7:28AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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- 242 Am Pdt Wed Sep 26 2018
Today..W winds 5 to 10 kt...becoming nw 5 to 15 kt this afternoon. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds.
Tonight..W winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds.
Thu..W winds 5 to 10 kt. Wind waves 2 ft or less. NW swell around 3 ft at 10 seconds.
Thu night..W winds 5 to 10 kt. Wind waves 2 ft or less. NW swell around 3 ft at 10 seconds.
Fri..W winds 5 to 10 kt. Wind waves 2 ft or less.
Fri night..W winds 5 to 15 kt. Wind waves 2 ft or less.
Sat..SW winds up to 10 kt. Wind waves 2 ft or less.
Sun..SW winds up to 10 kt. Wind waves 2 ft or less.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 4 ft with a dominant period of 10 seconds. Across the bar...combined seas 4 to 5 ft with a dominant period of 10 seconds. Maximum ebb current of 2.3 knots at 05:01 am Wednesday and 3.2 knots at 05:01 pm Wednesday.
PZZ500 242 Am Pdt Wed Sep 26 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A trough of low pressure along the coast will keep light west to northwest winds through Friday. Winds will turn southerly on Saturday as a low pressure system develops off the pacific northwest.


7 Day Forecast for Marine Location Near Inverness, CA
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location: 38.11, -122.87     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 261036
afdmtr
area forecast discussion
national weather service san francisco bay area
336 am pdt Wed sep 26 2018

Synopsis Seasonably warm today and Thursday. Cooling trend
starts Friday as an upper trough passes north of the golden gate
with a slight chance of a north bay shower Saturday. Dry and
seasonable Sunday. Then a slight chance of rain by early next
week.

Discussion As of 3:36 am pdt Wednesday... Marine layer is
around 1000 feet but showing signs of compressing. Given the
shallow depth its only filled into the salinas valley and locally
through the golden gate and petaluma gap. Dense fog reports are
showing up at santa rosa and half moon bay as well as around
monterey bay as the moisture gets compressed under the high
pressure and offshore flow. Large scale gradients from the deserts
of nevada to our coastline show about 8-9 mb so a moderate
offshore pattern but most of that gradient is actually over the
sierra so we are not seeing much wind in the hills. Vertical temp
and moisture gradients are impressive with 3 am readings showing
mid 70s in the hills with continued dry rh readings of 10-30%
while much cooler and more moist conditions persist in the
valleys. The warm air aloft suggests that today will be our
hottest day with inland areas warming into the 90s with widespread
upper 70s and 80s throughout the bay area. The coast will stay
cool with continued local onshore gradients.

Right now were not forecasting much change in the pattern for
Thursday but afternoon winds may trend onshore as an upper low
approaches and we lose our offshore tendencies. So if anything
there may be a few degrees of cooling Thursday but temps still
above normal overall.

Large upper low will approach the north bay coast by Friday and
all areas will notice a cooling trend with inland areas back into
the 70s due to airmass cooling and onshore breezes. The core of
the upper low looks to move onshore near CAPE mendocino. The
structure of this low suggests we'll only see showers right under
the core of the upper low which will probably be mendocino county
northward. However its close enough to keep the slight chance of
Saturday showers for the north bay.

That feature will eject inland on Sunday and leave a dry and
seasonable weather pattern in place for the last day of sept.

The extended forecast is quite interesting. Will be watching
tropical storm rosa which is currently getting itself organized
way down in the tropics west of central america. Latest forecasts
bring the feature northward to west of baja california as a
hurricane by later Sunday Monday. Meanwhile a longwave trough will
be developing off the california coast. Models are struggling
with the interaction of this trough and the tropical system
forecast to approach northern baja. We've seen some pretty drastic
run to run variations for the last few days and the euro GFS are
at odds with each other. There are scenarios where the mid-latitude
trough by-passes us and moves onshore over socal while interacting
with rosa while other scenarios suggest the potential for some
early season soaking rains over norcal by early next week.

Given all this believe its still prudent to just keep the low end
pops going in the forecast until some of the model uncertainty
gets more clear in the coming days. There are plausible scenarios
where much of the district sees little or no rain and vice-a-versa.

Aviation As of 10:24 pm pdt Tuesday... For 06z tafs. Marine
layer remains at around 1000 to 1200 feet in depth with stratus
along the coast and moving down the salinas valley. Given similar,
if not more extensive, cloud cover than this time last night
sticking with a persistence forecast. Low CIGS expected at most
sites aside from ksjc and klvk with patchy fog in the north bay
and reduced visibility possible at the monterey bay sites.

Generally light winds overnight becoming onshore in the afternoon
10-15 kt.

Vicinity of ksfo...VFR with light winds. Possible MVFR ifr cigs
late tonight 10z-12z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr lifr CIGS through 16z-18z tomorrow
morning with possible ifr lifr vis.

Marine As of 02:46 am pdt Wednesday... A trough of low pressure
along the coast will keep light west to northwest winds through
Friday. Winds will turn southerly on Saturday as a low pressure
system develops off the pacific northwest.

Mtr watches warnings advisories
Tday None.

Public forecast: rww
aviation: W pi
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 10 mi44 min W 1.9 G 2.9 57°F1014.9 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 25 mi34 min W 1.9 G 3.9 53°F 56°F1015.5 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 25 mi34 min SSE 1.9 G 3.9 52°F1015.5 hPa
46237 - San Francisco Bar, CA (142) 26 mi44 min 57°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi39 min W 1.9 53°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 28 mi44 min WSW 4.1 G 6 56°F 63°F1014.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 30 mi44 min SSW 6 G 8.9 56°F 1015.1 hPa (+0.0)
FTPC1 - 9414290 - San Francisco, CA 30 mi44 min WSW 4.1 G 8 54°F 60°F1015.1 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi44 min WSW 9.9 G 12 56°F 1014.5 hPa (+0.6)
PXSC1 33 mi44 min 56°F 56°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi44 min W 2.9 G 8 55°F 1013.9 hPa (+0.0)
46214 - Point Reyes, CA (029) 34 mi44 min 57°F5 ft
OBXC1 35 mi44 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 35 mi44 min NW 2.9 G 4.1 55°F 1014.9 hPa (+0.0)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 36 mi44 min W 2.9 G 4.1
AAMC1 - 9414750 - Alameda, CA 38 mi44 min W 5.1 G 5.1 56°F 66°F1015.1 hPa (+0.0)
LNDC1 38 mi44 min NNE 1.9 G 2.9 56°F 1014.8 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi44 min WNW 14 G 16 58°F 67°F1014.2 hPa (+0.3)58°F
PCOC1 - 9415144 - Port Chicago, CA 44 mi44 min W 17 G 19 58°F 67°F1013.9 hPa (+0.4)
SFXC1 - San Francisco Bay Reserve, CA 45 mi59 min WSW 1.9 56°F 1013 hPa48°F

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA17 mi49 minNNW 610.00 miMostly Cloudy46°F46°F100%1014.9 hPa
Petaluma Municipal Airport, CA17 mi69 minNNW 41.75 miFog/Mist52°F51°F100%1015.2 hPa

Wind History from DVO (wind in knots)
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Last 24hrNW5NW7N6CalmN6N8N4CalmCalm55N12N15N12N11N10NW5N7N5N5N9NW8NW4NW8
1 day agoCalmNW3CalmCalmCalmCalmCalmCalm4456NE11N10N11
G16
N8N7N8N8NW5N6NW4N6N8
2 days agoCalmCalmCalmN3CalmCalmCalmNE45SE7SE85SW7CalmS7E4NE3CalmCalmCalmCalmS4CalmCalm

Tide / Current Tables for Inverness, Tomales Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Point Reyes, California Current
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (6,6,7,8)
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Ground Weather Radar Station Sacramento, 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.