Tuesday, August21, 2018 L-36.com


Marine Weather and Tides
San Francisco, CA

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7/21/2018 Trying to make page Mobile Friendly

Sunrise 6:30AMSunset 7:55PM Tuesday August 21, 2018 7:02 PM PDT (02:02 UTC) Moonrise 4:00PMMoonset 1:14AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 235 Pm Pdt Tue Aug 21 2018
Rest of today..SW winds 10 to 20 kt with gusts up to 25 kt. Hazy.
Tonight..SW winds 5 to 15 kt.
Wed..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed night..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu night..SW winds 10 to 20 kt with gusts up to 30 kt.
Fri..SW winds 10 to 20 kt with gusts up to 30 kt.
Sat..SW winds 5 to 15 kt.
PZZ500 235 Pm Pdt Tue Aug 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light onshore winds over the coastal waters through the coming days. Breezy onshore winds will develop near coastal gaps through the afternoon and evenings. Winds will increase over the northern waters Friday into the weekend. Light mixed swell overall.


7 Day Forecast for Marine Location Near San Francisco, CA
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location: 37.81, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 220059
afdmtr
area forecast discussion
national weather service san francisco bay area
559 pm pdt Tue aug 21 2018

Synopsis After a period of cooling, a slight warming trend will
begin tomorrow as the upper trough influencing our current weather
exits to the northeast. This will allow temperatures to rebound to
near seasonal averages by late this week. Coastal clouds are
still expected to persist and penetrate inland each night.

Discussion As of 02:11 pm pdt Tuesday... Stratus has mainly
dissipated across the region with some lingering clouds around the
san francisco bay and northward. Satellite imagery also shows
smoke drifting across the north bay from various wildfires. Thanks
to persistent cloud cover and an upper trough stretching across
northern california, temperatures this afternoon are around 5 to
10 degrees cooler than this time yesterday. Expect another round
of overnight and morning low clouds as the marine layer is
forecast to remain above 1500 ft.

The upper low over idaho and associated trough that brought us
cooler weather will move to the northeast tomorrow, allowing the
ridge of high pressure over the desert southwest to strengthen.

This will kick off a warming trend through the rest of the week
and into the coming weekend. A broad upper trough over british
columbia and an upper low well to the west of california will
prevent the aforementioned ridge from strengthening enough to
cause any significant warming. Most locations will remain near
seasonal normals through the week. This translates to afternoon
high temperatures in the 60s to low 70s along the coast and 80s to
90s inland. Overnight and morning low clouds are expected to
continue as well.

Looking into the medium range, CPC outlooks continue to show near
normal temperatures over california. This morning's 8-14 day
outlook even shows below normal temperatures for much of the west
coast.

Aviation As of 5:57 pm pdt Tuesday... A moderately deep marine
layer up to 2400 and 2800 feet will likely compress tonight into
Wednesday as lower level thermal ridging strengthens; 925 mb temps
warm 6c-12c from midday earlier today through Wed afternoon. Bodega
bay, fort ord, point sur profilers starting to show some warming and
compression of the marine layer on recent check.

The 18z NAM shows increasing surface dewpoint temperatures sweeping
se-e across the coastal waters and a weak low pressure circulation
setting up just west of mendocino sonoma counties tonight thru thu
morning. This supports ongoing widespread ocean based stratus feed
along with at least patchy fog (4:20 pm visibility 1 2-1 mile in fog
at the farallon islands). Based on recent high-res model output
wildfire smoke both aloft and prob some smoke extending to the
surface will advance inland and add to presently smoky conditions
over the bay area through this evening into Wednesday; clearing
Wednesday could be a very slow process, many locations may have
stratus and a mix of fog smoky hazy conditions all day.

Expect moderate to poor slant range visibility through mid-late
week, and surface visibilities reduced to MVFR-ifr due to combo
fog and smoke, along with lowering stratus ceilings to ifr-vlifr.

Vicinity of ksfo... Stratus coverage is more extensive late this
afternoon, plenty of stratus feed off the ocean, and the marine
layer is moderately deep. Stratus ceilings are likely to lower as
lower level warming steps up through the evening into Wednesday
morning. Scattering of stratus may hold off until Wednesday
afternoon. Horizontal visibilities are good at the moment, but
should generally decrease through the evening; khaf vsby and cig
(ifr) have been steadily lowering.

Sfo bridge approach... Moderate to poor slant range visibility for
the period. Otherwise similar to ksfo.

Monterey bay terminals... MVFR gradually lowering to ifr tonight,
patchy lifr-vlifr is possible depending how quickly the marine
layer compresses; may need to adjust vsbys CIGS lower by 06z taf
issuance. Slow mixing process on Wednesday, clearing prob delayed
at least til late morning if not afternoon with brief window of
clearing in the afternoon. Stratus fog likely rolling back inland
early Wednesday evening and night.

Marine As of 4:52 pm pdt Tuesday... Light onshore winds over
the coastal waters through the coming days. Breezy onshore winds
will develop near coastal gaps through the afternoon and evenings.

Winds will increase over the northern waters Friday into the
weekend. Light mixed swell overall.

Mtr watches warnings advisories
Tngt None.

Public forecast: as
aviation: canepa
marine: drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi33 min 1015.5 hPa
PXSC1 2 mi33 min 63°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi33 min SW 4.1 G 8.9 62°F 1014.2 hPa
OBXC1 5 mi33 min 62°F 60°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi28 min W 1.9 60°F 1015 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi33 min WSW 5.1 G 8 62°F 1015.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi33 min WSW 9.9 G 12
AAMC1 - 9414750 - Alameda, CA 8 mi33 min W 7 G 8.9 62°F 67°F1015.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi33 min SW 7 G 9.9 62°F 1015.3 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi33 min SW 6 G 9.9 62°F 63°F1014.9 hPa
LNDC1 8 mi33 min W 7 G 8.9 63°F 1015 hPa
46237 - San Francisco Bar, CA (142) 10 mi63 min 57°F2 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi33 min SW 13 G 16 64°F 1014.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi23 min SSW 3.9 G 5.8 58°F 57°F1015.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi33 min SW 13 G 16 64°F 68°F1014.3 hPa62°F
RTYC1 - 9414523 - Redwood City, CA 24 mi33 min W 12 G 14 65°F 73°F1014.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi33 min SW 14 G 17 65°F 69°F1013.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi33 min S 4.1 G 5.1 58°F1014.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi33 min WNW 13 G 20 67°F 1013.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi78 min W 14 68°F 1013 hPa57°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi73 min SSW 3.9 G 3.9 60°F 60°F4 ft1015.4 hPa (-0.6)

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, CA14 mi67 minSW 1210.00 miMostly Cloudy65°F55°F73%1014.8 hPa
Oakland, Metro Oakland International Airport, CA14 mi70 minW 1310.00 miOvercast65°F57°F76%1014.8 hPa
Hayward, Hayward Air Terminal, CA20 mi69 minWNW 1010.00 miMostly Cloudy68°F55°F65%1015.7 hPa
Half Moon Bay Airport, CA21 mi63 minS 54.00 miFog/Mist59°F57°F94%1015.9 hPa
San Carlos Airport, CA22 mi2.2 hrsW 1110.00 miMostly Cloudy70°F57°F64%1014.2 hPa
Novato / Gnoss Field, CA24 mi68 minSW 910.00 miOvercast66°F57°F73%1014.6 hPa
Concord, Buchanan Field, CA24 mi70 minSW 1110.00 miFair68°F55°F63%1013 hPa

Wind History from SFO (wind in knots)
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Last 24hrSW13W13W10W9--W7SW10SW11SW6SW6SW7SW5SW5W6W5W6W4W7SW10SW10SW12W11W12SW12
1 day agoW17W14W12W10W7NW6W5CalmSW4SW5W5CalmW6W8CalmNW7NW11N8
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2 days agoNW18NW17W17W16W14W11W8W10W10W9W9W4CalmCalmCalmNE4NW9NW13NW14NW17NW19W22NW20W20

Tide / Current Tables for San Francisco, California
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San Francisco
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Tue -- 02:14 AM PDT     Moonset
Tue -- 03:10 AM PDT     0.45 feet Low Tide
Tue -- 06:30 AM PDT     Sunrise
Tue -- 10:22 AM PDT     4.54 feet High Tide
Tue -- 02:57 PM PDT     2.88 feet Low Tide
Tue -- 04:59 PM PDT     Moonrise
Tue -- 07:54 PM PDT     Sunset
Tue -- 08:58 PM PDT     5.81 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.61.50.80.50.61.11.82.63.54.14.54.54.13.532.93.13.64.355.65.85.54.7

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Tue -- 12:46 AM PDT     -2.05 knots Max Ebb
Tue -- 02:14 AM PDT     Moonset
Tue -- 04:52 AM PDT     0.00 knots Slack
Tue -- 06:30 AM PDT     Sunrise
Tue -- 08:23 AM PDT     1.43 knots Max Flood
Tue -- 11:09 AM PDT     -0.00 knots Slack
Tue -- 02:08 PM PDT     -0.93 knots Max Ebb
Tue -- 04:49 PM PDT     0.00 knots Slack
Tue -- 04:59 PM PDT     Moonrise
Tue -- 07:54 PM PDT     Sunset
Tue -- 07:58 PM PDT     1.02 knots Max Flood
Tue -- 10:21 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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-2-2-1.9-1.6-0.80.10.71.21.41.40.90.1-0.6-0.9-0.9-0.9-0.50.10.60.910.90.3-0.7

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 (22,6,7,8)
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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.