Tuesday, September18, 2018 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
What's New / NOTES
7/21/2018 Trying to make page Mobile Friendly

Sunrise 6:53AMSunset 7:13PM Tuesday September 18, 2018 2:28 PM PDT (21:28 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
    EDIT      (on/off)   Help
PZZ531 San Francisco Bay South Of The Bay Bridge- 843 Am Pdt Tue Sep 18 2018
Today..W winds 5 to 10 kt...becoming 5 to 15 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 5 to 15 kt with gusts up to 25 kt.
Wed..W winds 10 to 20 kt with gusts up to 30 kt.
Wed night..W winds 10 to 20 kt with gusts up to 30 kt.
Thu..W winds 10 to 20 kt with gusts up to 25 kt.
Thu night..W winds 10 to 20 kt with gusts up to 25 kt.
Fri..W winds 5 to 15 kt.
Sat..W winds 5 to 15 kt.
PZZ500 843 Am 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 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.


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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
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
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi47 min W 7 G 14 56°F 61°F1014.5 hPa
PXSC1 2 mi47 min 61°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi47 min WSW 8 G 9.9 63°F 1013.1 hPa
OBXC1 5 mi47 min 60°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi47 min WNW 7 G 8.9 60°F 1014 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi47 min W 7 G 8.9
AAMC1 - 9414750 - Alameda, CA 8 mi47 min WSW 6 G 8 61°F 66°F1014.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi41 min SW 11 G 14 59°F 1014.2 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi41 min 64°F
LNDC1 8 mi47 min W 6 G 8.9 62°F 1014 hPa
46237 - San Francisco Bar, CA (142) 10 mi59 min 57°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi41 min WSW 6 G 8 65°F 1013.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi39 min NW 14 G 16 54°F 55°F5 ft1015.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi41 min 67°F
RTYC1 - 9414523 - Redwood City, CA 24 mi41 min 69°F
PCOC1 - 9415144 - Port Chicago, CA 27 mi47 min WNW 7 G 8.9 68°F 66°F1012.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi41 min WNW 15 G 19 55°F1014.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi41 min NW 6 G 8.9 70°F 1012.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi104 min W 5.1 70°F 1014 hPa52°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last
24hr
SW10
G20
W11
G17
SW10
G18
SW8
G17
SW5
G15
SW6
G12
W7
G13
W8
G16
W8
G12
W8
G17
W8
G13
W6
G11
SW6
G10
SW4
G8
SW4
G8
SW4
SW3
G8
SW4
G7
S3
S5
G8
SW7
G10
SW3
G10
W6
G14
W8
G17
1 day
ago
SW11
G15
SW7
G13
SW11
G15
SW5
G11
SW9
G14
SW11
G14
SW7
G15
W10
G14
SW6
G12
W2
G5
S5
W3
S2
G6
SW4
G8
SW4
G10
SW3
SW5
G8
SW4
G9
W6
G9
W3
G7
W5
G11
W8
G12
SW11
G17
SW11
G18
2 days
ago
SW13
G19
SW12
G17
SW11
G16
SW9
G17
SW7
G16
SW9
G14
SW9
G14
W8
G11
SW5
G8
SW6
SW5
SW7
SW7
SW9
W5
SW4
SW6
G10
SW3
SW9
SW7
G12
SW12
G15
SW8
G14
SW8
G14
SW7
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi33 minWNW 1410.00 miA Few Clouds65°F52°F63%1013.4 hPa
Oakland, Metro Oakland International Airport, CA14 mi36 minNW 1210.00 miA Few Clouds66°F54°F65%1013.6 hPa
Hayward, Hayward Air Terminal, CA20 mi35 minW 1010.00 miFair69°F52°F55%1014.3 hPa
Half Moon Bay Airport, CA21 mi34 minW 78.00 miOvercast59°F53°F82%1015.2 hPa
San Carlos Airport, CA22 mi42 minNNW 810.00 miClear68°F53°F60%1013.5 hPa
Novato / Gnoss Field, CA24 mi34 minVar 68.00 miFair75°F53°F47%1012.9 hPa
Concord, Buchanan Field, CA24 mi36 minNW 1010.00 miFair76°F51°F42%1011.3 hPa

Wind History from SFO (wind in knots)
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last 24hrW19W22
G29
W22W22
G28
W20W17
G23
W18
G25
W13
G20
W12W12
G18
W11W7SW8SW7W8S4SE3SW3W7W66N5N7NW14
1 day agoW18W19W17W19
G25
W19W17W16W16W12W12W9W5W9W86CalmW7NW4W9W8W11NW12W12W14
2 days agoW18W20W21W17W17W16W13W15
G24
W13W14NW9W11W8W6W8NW5W8NW6NW8NW8W10W14W18
G21
W19

Tide / Current Tables for San Francisco, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.