Tuesday, September18, 2018 L-36.com


Marine Weather and Tides
Pacifica, CA

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Sunrise 6:54AMSunset 7:13PM Tuesday September 18, 2018 3:10 PM PDT (22:10 UTC) Moonrise 2:43PMMoonset 12:00AM Illumination 65% Phase: Waxing Gibbous; Moon at 9 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 Point Reyes To Pigeon Point To 10 Nm- 242 Pm Pdt Tue Sep 18 2018
.small craft advisory in effect through late Wednesday night...
Tonight..NW winds 20 to 30 kt. Wind waves 3 to 5 ft. W swell 3 ft at 8 seconds.
Wed..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 2 to 4 ft at 10 seconds.
Wed night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 2 to 3 ft at 11 seconds.
Thu..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 2 to 4 ft at 11 seconds.
Thu night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 4 ft at 11 seconds. Patchy fog after midnight.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft. Patchy fog.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft. Patchy fog.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant period of 16 second swell periods. Across the bar...combined seas 4 to 6 ft with a dominant period of 16 second swell periods. Maximum ebb current of 1.5 knots at 11:49 pm Tuesday and 1.5 knots at 12:37 pm Wednesday.
PZZ500 242 Pm Pdt Tue Sep 18 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northwest winds will continue over the ocean as high pressure builds and pressure gradients tighten west of cape mendocino. This will produce fresh wind waves and wash out any remaining southerly swell. By Thursday night or Friday the thermal trough will develop along the coast and drift offshore, pushing the strongest winds farther offshore while lighter winds develop near the coast into the weekend.


7 Day Forecast for Marine Location Near Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 182100
afdmtr
area forecast discussion
national weather service san francisco bay area
200 pm pdt Tue sep 18 2018

Synopsis Seasonably cool conditions will persist over the region
today as a weak upper level trough pushes inland over northern
california. A shift in the weather through the next few days with
warmer temperatures and localized fire weather concerns. Conditions
will then moderate back to near normal by the upcoming weekend.

Discussion As of 02:00 pm pdt Tuesday... The stagnant weather
pattern that developed across the west over the previous several
days has finally begun to progress downstream today due to a
number of changes in the atmosphere. Most importantly for our
local weather: the upper trough that had been locked in place over
the west coast through the last week is finally transitioning into
california this afternoon. The dissipation of atmospheric
blocking features downstream (such as a ridge over the southern
conus and hurricane florence farther east) and advancement of
progressive atmospheric features upstream (particularly the
arrival of an energetic vorticity wave through the broader trough)
are to thank for facilitating the change in the weather pattern.

Visible imagery shows low clouds residing within the marine layer
banked up along the coast from point arena southward through the
monterey peninsula. The marine layer was allowed to deepen and
persist into the afternoon by the lowering pressure ahead of the
arrival of the upper trough. The advancing trough will mix out a
portion of the marine layer as it progresses through the coastal
waters, somewhat limiting the potential for the same extensive
cloud cover to form again tonight. Temperatures are slightly lower
today in response to the deeper marine layer and minor cold air
advection.

As the trough passes and high pressure begins to settle in over
the next few days, expect a more tangible transition in the
weather in the form of a warming trend to near to slightly above
normal temperatures, dry offshore winds, and a compressed marine
layer. Thursday is forecast to be the peak of the warming trend,
with afternoon highs for most urban locations in the 70s closer to
coast to mid 80s inland. The hottest inland locations will push
into the upper 80s to mid 90s.

Dry, gusty northerly winds will also develop across the interior,
particularly across north and eastern napa county, from Wednesday
night through Thursday morning. Sustained winds up to around 20
mph with gusts up to 35 mph are possible during this time period.

These winds will advect in drier air to the region which will
cause overnight relative humidity readings to struggle to recover,
leaving the driest spots in the 25 to 35% range overnight. By the
late morning to early afternoon, these same spots could drop into
the upper single digit to low teens rh%. These will lead to
locally critical fire weather conditions for the driest and
windiest reaches of napa county, particularly around the lake
berryessa recreational area and higher terrain along the border
with yolo county. Extremely dry fire fuels will only exacerbate
the fire weather risk there. As a result, a fire weather watch has
been issued in coordination with the sacramento forecast office
for late Wednesday night through early Thursday afternoon (see the
sforfwmtr for more details).

Models suggest low pressure redevelops offshore by the weekend,
promoting a return towards cooler temperatures and increased
onshore flow. The outlook is murky by early next week due to low
model to model and run to run consistency.

Aviation As of 10:55 am pdt Tuesday... For 18z tafs. Low clouds
slowing eroding inside sf bay withVFR conditions expected by 18-19z.

Clouds around monterey bay a little more stubborn and slow to
burn. Low clouds should come back into sf bay between 04-06z this
evening with moist boundary layer and onshore flow in place.

Moderate afternoon evening westerly seabreezes.

Vicinity of ksfo... Goes17 1 minute imagery shows skies clearing
over the terminal by 18z. Moderate westerly seabreeze this
afternoon and evening 15 gust 25 kt.

Sfo bridge approach... .Bridge is clear with visuals already being
reported.VFR should stay in place through at least 05z this
evening.

Monterey bay terminals... .Onshore flow with deep moist boundary
layer may keep CIGS over kmry for much of today with clearing at
ksns. Moderate seabreeze this afternoon with CIGS returning 2-3z.

Marine As of 10:47 am pdt Tuesday... Gusty northwesterly winds
will continue across the coastal waters through mid-week due to
high pressure over the eastern pacific. Winds will generate steep
wind waves creating hazardous sea conditions, especially for
smaller vessels. Southerly swell will lesson over the next day or
two. Northwest winds will begin to subside late this week.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 11 pm
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
sca... Mry bay until 10 pm
public forecast: drp
aviation: rww
marine: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 13 mi40 min WSW 8 G 14 56°F 62°F1014.1 hPa
46237 - San Francisco Bar, CA (142) 13 mi70 min 57°F5 ft
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi40 min WSW 8 G 13 61°F 1012.7 hPa
PXSC1 14 mi40 min 61°F 54°F
AAMC1 - 9414750 - Alameda, CA 15 mi46 min W 8.9 G 11 61°F 66°F1013.9 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi40 min WNW 8 G 11 60°F 1013.5 hPa
OBXC1 16 mi40 min 61°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi40 min WSW 11 G 12
LNDC1 17 mi40 min W 5.1 G 8.9 63°F 1013.5 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi40 min NNW 12 G 15 64°F 69°F1013.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi30 min NW 14 G 18 54°F 55°F1014.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi40 min SSW 12 G 15 60°F 1013.7 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi40 min 64°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi40 min WSW 7 G 8.9 67°F 1012.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi40 min NW 13 G 15 68°F 67°F1012.4 hPa55°F
PRYC1 - 9415020 - Point Reyes, CA 36 mi46 min NW 14 G 19 55°F1014.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi40 min W 8 G 9.9 69°F 67°F1012.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi40 min NW 8 G 9.9 70°F 1011.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi85 min W 5.1 73°F 1013 hPa49°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA8 mi15 minno data7.00 miOvercast57°F51°F82%1014.9 hPa
San Francisco, San Francisco International Airport, CA8 mi14 minWNW 1810.00 miA Few Clouds and Breezy65°F51°F61%1013 hPa
San Carlos Airport, CA15 mi19 minNNW 1010.00 miClear70°F53°F57%1012.9 hPa
Oakland, Metro Oakland International Airport, CA16 mi17 minW 1510.00 miA Few Clouds66°F53°F63%1013.1 hPa
Hayward, Hayward Air Terminal, CA21 mi16 minWNW 1110.00 miFair70°F53°F55%1013.7 hPa
Palo Alto Airport, CA23 mi23 minNW 1310.00 miClear70°F57°F64%1012.9 hPa

Wind History from HAF (wind in knots)
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Last 24hrNW9NW11
G16
NW10NW11NW10NW10NW9NW8NW8NW6NW4W4NW4CalmSW4SW5SW4CalmCalmW5SW5SW8SW6NW9
1 day agoNW11NW8NW8NW9NW7NW8NW8NW5NW6NW6NW6NW3CalmCalmCalmCalmCalmNW4W5NW5W8NW6NW8NW10
2 days agoNW6NW8NW5W3N6NW7NW6NW8N4NW6NW6NW4CalmCalmN4N3N5NW4NW6NW7NW8W6NW7NW10

Tide / Current Tables for Seaplane Harbor, San Francisco 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 Sierra Point 1.3 mi ENE, South San Francisco Bay, 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (18,4,5,8)
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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.