Wednesday, September26, 2018 L-36.com


Marine Weather and Tides
Bloomfield, CA

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

Sunrise 7:00AMSunset 7:03PM Tuesday September 25, 2018 10:18 PM PDT (05:18 UTC) Moonrise 6:50PMMoonset 6:27AM Illumination 98% 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 815 Pm Pdt Tue Sep 25 2018
Tonight..NW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 9 seconds.
Wed..NW winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds.
Wed night..NW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds.
Thu..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell around 3 ft at 10 seconds.
Thu night..NW 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. NW swell around 2 ft.
Fri night..W winds up to 10 kt. Wind waves 2 ft or less. NW swell around 2 ft.
Sat..S winds 5 to 15 kt. Wind waves 2 ft or less. NW swell around 2 ft.
Sun..SW winds up to 10 kt. Wind waves 2 ft or less. NW swell around 2 ft.
PZZ500 815 Pm Pdt Tue Sep 25 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate west to northwest winds will continue through the week as an upper ridge remains off the coast of the pacific northwest. Low pressure will then move in resulting in weak southerly winds by this coming weekend.


7 Day Forecast for Marine Location Near Bloomfield, CA
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location: 38.36, -122.86     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 260429
afdmtr
area forecast discussion
national weather service san francisco bay area
929 pm pdt Tue sep 25 2018

Synopsis Warm offshore flow will persist in the hills and for
inland valleys at least through midweek. The coast and coastal
valleys will still be under the influence of cooler onshore flow
with a marine layer in place. A cooling trend for all areas Friday
into the weekend as a mainly dry upper trough approaches the
region. Some indications for rain chances across northern california
by early next week.

Discussion As of 9:15 pm pdt Tuesday... Mainly clear skies
prevail across inland areas this evening while the coast and
coastal valley remain shrouded under a 1000 foot marine layer.

Coastal regions saw minimal to no clearing today as the gradients
along the coast remained primarily onshore. Temperatures cooled
slightly across the bay area today as a result of the onshore
gradient which resulted in moderate inland intrusion of stratus
this morning. Meanwhile southern inland locations that were not
affect by the relatively shallow marine layer saw temperatures
warm slightly. Temperatures finished off the day with highs in the
60s along the coast, 70s around the bay and mid 80s to mid 90s
over inland locations.

Warm and dry weather conditions will continue through Thursday as
high pressure at the surface continues to ridge across the
pacific northwest and into the great basin and a surface trough
persists along the california coast. This will result in light
offshore flow, warm temperatures and low relative humidities
across the interior and hills.

A pattern change remains on track for Friday on into the weekend
with cooler temperatures and a chance of rain by the beginning of
next week.

The forecast remains on track. No updates expected at this time.

From previous discussion... A rex block centered approximately 900
miles wnw of san francisco is acting as a 1750 mile meridional
(north to south) barrier in the atmospheric flow. Water vapor
imagery shows moisture wrapping over the north of the barrier
through the gulf of alaska before rotating into the pacific
northwest. At the same time, a band of subtropical moisture
associated with the upper low (which forms the southern half of
the rex block) is rotating counterclockwise into southern baja
california south of the rex block. Meanwhile, a dry slot of air is
positioned over the san francisco and monterey bay area in
between the moister air rotating into the western CONUS from both
the south and northern flanks of the rex block.

At the most simple level, a rex block consists of a high pressure
positioned north of a low pressure. Both the high and low pressure
circulations present in the current rex block will play a role in
the weather through the next several days. The high pressure
portion of the rex block has and will continue to result in an
increase of offshore winds, warmer temperatures, dry inland
conditions, and a compressed marine layer near the coast as it
wobbles over northern california. The rex block breaks down late
in the work week, freeing up the low pressure system to slide over
northern california through the early weekend. This will bring a
cooling trend, increased onshore flow, and even a slight chance of
some very light rainfall over the extreme northern stretches of
sonoma county. The medium to longer term models are in fairly good
agreement of this scenario playing out, albeit, with the bulk of
any rainfall remaining farther northward over extreme northwest
california. Any accumulations will be measured in the low
hundredths range.

Low model to model and run to run model consistency beginning
early next week. The GFS and euro both agree that the weather
pattern will remain progressive and unsettled for early next week.

Both models feature a cool, wet trough arriving behind the
remnants of the rex block features by Monday morning in addition
to an eastern pacific tropical system moving into the vicinity of
the region. Neither model seems to know what to make of these two
features. The 00z euro was extremely wet and progressive for our
region, however, the 12z euro has slowed down and keeping the
system corralled along the coastline, rather than directly over
the san francisco bay area. The GFS is playing a completely
different tune, shunting the upper low and moisture farther south,
over southern california. None of these solutions will likely be
the one that actually plays out due to the unknown variable of the
tropical system lingering farther offshore. That said, have
nudged chance of rain into the slight chance category for early
next week. Expect to see the forecast change rapidly as both the
approaching trough arriving from the northwest and developing
tropical cyclone arriving from the southwest come into better
focus.

Aviation As of 04:31 pm pdt Tuesday... For 00z tafs. Marine
layer remains at around 1000 to 1200 feet in depth with stratus
clinging to most of the coastline.VFR through the afternoon and
evening before low clouds return tonight. Expecting similar
conditions overnight as was seen yesterday with low CIGS at most
sites expect for ksjc and klvk. Similarly, patchy fog will be
possible again for the monterey bay and north bay sites.

Vicinity of ksfo...VFR with winds gusting to around 20 kt through
the early evening. Lower CIGS and possibly vis may return tonight
between 09z-12z Wednesday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR through the evening. Ifr lifr CIGS to
return around 06z-08z tonight with possibly reduced visibilities
late.

Fire weather As of 9:28 pm pdt Tuesday... The red flag warning
for the north and east bay hills was allowed to expire at 5 pm
this evening. Nonetheless conditions will remain warm and dry with
localized breezy conditions across the hills through tonight.

Winds are forecast to continue diminishing and will remain below
warning criteria. Note, very dry conditions will prevail
especially across elevated terrain above the 1000 feet marine
layer. Cooler temperatures and higher relative humidity values
will return Friday as a cooler and wetter airmass moves in.

Marine As of 8:15 pm pdt Tuesday... Light to moderate west to
northwest winds will continue through the week as an upper ridge
remains off the coast of the pacific northwest. Low pressure will
then move in resulting in weak southerly winds by this coming
weekend.

Mtr watches warnings advisories
Tngt None.

Public forecast: cw
aviation marine: as
fire weather: cw
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 25 mi29 min WSW 1.9 G 5.8 52°F5 ft1014.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 26 mi43 min SSE 1.9 G 2.9 58°F1014.4 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi31 min 63°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi31 min W 5.1 G 6 63°F 1013.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi38 min WNW 5.1 58°F 1014 hPa
46237 - San Francisco Bar, CA (142) 41 mi49 min 58°F3 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 41 mi31 min S 9.9 G 12 58°F 1014.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi29 min WSW 5.8 G 7.8 54°F 55°F3 ft1015.2 hPa
46214 - Point Reyes, CA (029) 43 mi19 min 57°F4 ft
FTPC1 - 9414290 - San Francisco, CA 44 mi37 min Calm G 6 54°F 61°F1014.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 45 mi31 min 67°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 46 mi31 min SSW 2.9 G 6 55°F 1013.2 hPa
PXSC1 46 mi37 min 56°F 56°F
SFXC1 - San Francisco Bay Reserve, CA 46 mi94 min W 9.9 67°F 1011 hPa46°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi31 min WNW 5.1 G 7 57°F 1014.3 hPa
OBXC1 47 mi31 min 57°F 56°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 48 mi37 min WNW 5.1 G 7
PCOC1 - 9415144 - Port Chicago, CA 48 mi31 min WSW 8 G 8.9 65°F 67°F1012.8 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA11 mi26 minS 48.00 miFair52°F48°F89%1012.8 hPa
Petaluma Municipal Airport, CA15 mi24 minNW 45.00 miFog/Mist52°F51°F100%1013.9 hPa
Novato / Gnoss Field, CA22 mi24 minN 710.00 miFair54°F50°F88%1013.5 hPa

Wind History from STS (wind in knots)
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Last 24hrCalmCalmCalmSE4CalmCalmCalmCalmCalmCalmCalm3Calm4S6S8S10S10SE10SE9S7S4S3S4
1 day agoCalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmCalmSW4S4S7SW7S9S7SW7S7S8SE7S4SE3
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4S7S7SE8SE12S8S8S4SE3SE3

Tide / Current Tables for Bodega Harbor entrance, 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 Tomales Bay entrance, California
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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 (1,6,7,8)
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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.