Friday, August18, 2017 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:27AMSunset 7:58PM Friday August 18, 2017 9:26 AM PDT (16:26 UTC) Moonrise 2:05AMMoonset 4:44PM Illumination 14% Phase: Waning Crescent; Moon at 26 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 San Francisco Bay North Of The Bay Bridge- 827 Am Pdt Fri Aug 18 2017
.small craft advisory in effect from Saturday morning through late Saturday night...
Today..SW winds 10 to 20 kt.
Tonight..SW winds 10 to 20 kt.
Sat..SW winds 5 to 15 kt...increasing to 15 to 25 kt in the afternoon.
Sat night..SW winds 15 to 25 kt. Patchy fog after midnight.
Sun..SW winds 10 to 20 kt. Patchy fog.
Mon..SW winds 5 to 15 kt.
Tue..SW winds 10 kt.
PZZ500 827 Am Pdt Fri Aug 18 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Expect increasing northwesterly winds to continue through the weekend as high pressure builds over the eastern pacific. Locally steep wind waves will also accompany the increasing winds.

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 181502
afdmtr
area forecast discussion
national weather service san francisco bay area
802 am pdt Fri aug 18 2017

Synopsis Look for one more day of minor warming today as a
ridge of high pressure continues to build into our region. Minor
cooling can be expected over the weekend into next week as an
upper level low and shortwave trough move into our region.

Overnight clouds can be expected especially along the coast.

Discussion As of 08:02 am pdt Friday... Only a few minor
adjustments made to this morning's forecast as the low clouds
have managed to progress inland. Livermore, for example, recently
transitioned from clear skies to overcast conditions. Additionally,
low clouds managed to make it to san francisco international
airport with bkn ovc conditions reported over the past hour. Do
expect clearing by mid late morning for most locations today with
mostly clear skies for the afternoon. With a building ridge just
offshore, this morning's 12z oakland sounding shows increasing 500
mb heights compared to 24 hours ago. At 850 mb, temps have warmed
by about 3 deg c. As a result, this will translate to several
degrees of warming at the surface this afternoon for most interior
areas. High temperatures will be generally in the 60s and 70s
along the coast and 80s and 90s for inland communities.

For additional forecast details, please refer to the previous
discussion section.

Prev discussion As of 3:00 am pdt Friday... For the first time in
quite awhile, satellite shows that clouds are fairly limited
across our region with even monterey bay cloud-free at this hour.

Satellite does show clouds finally advancing toward the coast and
with a westerly gradient nearly 3 mb, we should see them at least
advance to the coast before sunrise. Synoptically a ridge of high
pressure will move across our region today which will lead to a
few degrees of warming. Temperatures will be in the 60s and 70s at
the coast with 80s and 90s inland.

The ridge will be replaced by an upper level low and a shortwave
trough that will dive down from the north. This will lead to
cooling over the weekend and next week with most spots dropping 5
to 10 degrees. Clouds will also be likely each night especially
near the coast. Big question will be how much the marine layer
will change with the low overhead. Could be a case of the marine
layer mixing out. Regardless, next week is shaping up to be very
quiet with temperatures near normal.

Aviation As of 4:55 am pdt Friday... High pressure continues to
compress the marine layer this morning with tops now down to 1500
ft. The marine layer struggled to push inland overnight with MVFR
or lower CIGS only at koak ksjc and ksfo this morning withVFR
elsewhere. Satellite imagery shows the marine layer is deepest
and most continuous across the north bay (ie ovc004 at ksts)
while kmry and ksns remain clear. Latest imagery shows the marine
layer rapidly approaching coastal monterey bay as of 5am and
expect to see ifr to MVFR CIGS develop there around sunrise before
mixing out early this morning. Most forecast models indicate the
stratus deck will rebound slightly tonight with a thicker depth
and more widespread coverage than this morning.

Vicinity of ksfo... PredominatelyVFR with brief MVFR posbl around
sunrise as marine layer reaches morning maxima. Breezy onshore
winds in the afternoon. MVFR late tonight through sunrise
tomorrow.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR through early this morning with ifr
cigs from sunrise through mid morning. Marine deck increases
tonight.

Marine As of 04:42 am pdt Friday... Increasing northwest winds
through the weekend as high pressure builds into the region.

Locally steep wind waves will accompany the increasing winds.

Mtr watches warnings advisories
Tday None.

Public forecast: rowe bell
aviation: drp
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi44 min SW 1.9 G 6 58°F 62°F1016.9 hPa
PXSC1 2 mi38 min 60°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi38 min W 4.1 G 8 60°F 1015.5 hPa
OBXC1 5 mi38 min 60°F 58°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi44 min SE 5.1 59°F 1017 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi38 min W 2.9 G 6 60°F 1016.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi38 min WSW 2.9 G 2.9
AAMC1 - 9414750 - Alameda, CA 8 mi38 min WNW 2.9 G 4.1 61°F 68°F1017.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi38 min SSW 8 G 11 60°F 1016.8 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi44 min SSW 4.1 G 5.1 59°F 65°F1016.4 hPa
LNDC1 8 mi38 min WSW 5.1 G 6 60°F 1016.6 hPa
46237 - San Francisco Bar, CA (142) 10 mi56 min 60°F4 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi38 min WSW 8 G 11 60°F 1016 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi36 min N 1.9 G 1.9 57°F 58°F4 ft1016.6 hPa (+0.7)
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi38 min W 13 G 15 61°F 69°F1016.3 hPa59°F
RTYC1 - 9414523 - Redwood City, CA 24 mi38 min E 1.9 G 4.1 63°F 72°F1016 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi38 min WSW 14 G 18 61°F 69°F1015.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi38 min ESE 1 G 1.9 62°F 61°F1016.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi38 min NW 16 G 19 65°F 1014.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi101 min W 9.9 58°F 1015 hPa55°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi36 min W 1.9 G 3.9 60°F 62°F7 ft1016 hPa (+0.5)

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 mi90 minW 610.00 miMostly Cloudy61°F54°F78%1016.3 hPa
Oakland, Metro Oakland International Airport, CA14 mi33 minWNW 410.00 miOvercast62°F57°F86%1016.5 hPa
Hayward, Hayward Air Terminal, CA20 mi32 minW 310.00 miOvercast63°F54°F73%1017.3 hPa
Half Moon Bay Airport, CA21 mi31 minESE 38.00 miOvercast61°F0°F%1015.9 hPa
San Carlos Airport, CA22 mi31 minNNE 38.00 miOvercast with Haze63°F57°F83%1016.9 hPa
Novato / Gnoss Field, CA24 mi51 minN 010.00 miOvercast59°F55°F88%1016.6 hPa
Concord, Buchanan Field, CA24 mi33 minW 510.00 miFair66°F55°F70%1014.4 hPa

Wind History from SFO (wind in knots)
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Last 24hrNW4NW6N5N8NW14NW15NW16NW18W20W18W14NW14NW14W12W15W13W11W10W10W9W9W7W6W6
1 day agoCalmSE7N6N8N86NW13
G19
W13NW14NW13NW14NW10W9NW7NW5NW6NW4W4W5S3W4CalmCalmNW4
2 days agoSW8SW15SW11SW16SW14
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W15W13W11SW6SW11W11SW66S4S4CalmCalmSE3SE3

Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Fri -- 03:05 AM PDT     Moonrise
Fri -- 03:22 AM PDT     -0.33 feet Low Tide
Fri -- 06:28 AM PDT     Sunrise
Fri -- 10:31 AM PDT     4.84 feet High Tide
Fri -- 03:09 PM PDT     2.50 feet Low Tide
Fri -- 05:43 PM PDT     Moonset
Fri -- 07:58 PM PDT     Sunset
Fri -- 09:25 PM PDT     6.68 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.91.40.2-0.3-0.20.31.22.23.34.24.84.84.33.52.82.52.73.34.25.26.16.66.65.8

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Fri -- 01:03 AM PDT     -2.79 knots Max Ebb
Fri -- 03:05 AM PDT     Moonrise
Fri -- 05:09 AM PDT     0.00 knots Slack
Fri -- 06:28 AM PDT     Sunrise
Fri -- 08:32 AM PDT     1.82 knots Max Flood
Fri -- 11:33 AM PDT     -0.00 knots Slack
Fri -- 01:46 PM PDT     -1.36 knots Max Ebb
Fri -- 05:03 PM PDT     0.01 knots Slack
Fri -- 05:43 PM PDT     Moonset
Fri -- 07:58 PM PDT     Sunset
Fri -- 08:10 PM PDT     1.45 knots Max Flood
Fri -- 10:51 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.4-2.8-2.6-2.1-1.3-0.20.81.41.81.81.40.6-0.5-1.2-1.4-1.1-0.7-00.61.21.41.30.8-0.2

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.