Friday, August23, 2019 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:30AMSunset 7:53PM Friday August 23, 2019 6:03 AM PDT (13:03 UTC) Moonrise 11:32PMMoonset 1:06PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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- 249 Am Pdt Fri Aug 23 2019
.small craft advisory in effect from 9 am pdt this morning through this evening...
Today..SW winds 10 to 15 kt, increasing to 15 to 25 kt with gusts up to 30 kt this afternoon.
Tonight..SW winds 15 to 20 kt with gusts up to 25 kt.
Sat..SW winds 10 to 15 kt with gusts up to 25 kt.
Sat night..SW winds 10 to 15 kt.
Sun..SW winds 10 to 15 kt with gusts up to 25 kt.
Sun night..SW winds 10 to 15 kt.
Mon..SW winds 15 to 20 kt with gusts up to 25 kt.
Tue..SW winds 15 to 20 kt with gusts up to 25 kt.
PZZ500 249 Am Pdt Fri Aug 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will decrease across the area today but remain breezy over the northern outer waters. Steep northwesterly swell at 8 to 10 seconds will decrease today through the weekend with period becoming 7 to 8 seconds over the weekend. A coastally trapped southerly wind reversal will lead to light southwesterly winds over the waters this weekend. A moderate southerly swell will arrive on Sunday through early next week with light northwesterly swell continuing through the period.


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 231156
afdmtr
area forecast discussion
national weather service san francisco bay area
456 am pdt Fri aug 23 2019

Synopsis A shallow marine layer along the coast with onshore
winds will bring seasonable temperatures to the bay area today.

High pressure begins to strengthen and rebuild over the state this
weekend allowing for inland areas to warm back into the 90s.

Milder conditions will persist near the coast with a shallow
marine layer. The ridge will weaken slightly by Tuesday and
Wednesday as the remnants of tropical storm ivo pass west of the
golden gate. This may bring some increasing clouds and more
humidity to the region.

Discussion As of 3:38 am pdt Friday... 24 hour temps and
humidity trends are noteworthy this morning with dewpoints running
5-10 degrees drier than yesterday at this time with readings back
down into the 50s while temps hover in the lower 60s. The moist
airmass has been pushed south of our region per the latest tpw
satellite scans. A more typical summertime regime is returning to
the bay area and central coast. A shallow 500-1000 foot marine
layer is hugging the coast from the golden gate southward to big
sur. Cloud bases are shallow from 400-600 feet from half moon bay
to the monterey bay region. There is steady onshore pressure
gradients in place with about 2 mb sfo to sacramento allowing the
cooler marine air to ooze inland. The 850 mb temps are around 22
celsius this afternoon which should keep the warmest inland areas
in the lower 90s while 70s 80s persist around the bay with 60s for
the beaches.

A broad 594 dm ridge is forecast to build on Saturday, extending
from the eastern pacific, across california and all the way
towards arizona. This will bring some more inland warming with mid
and upper 90s returning to the inland valleys by Sunday and Monday
as 850 mb temps warm to around 25 celsius. The surface onshore
gradients will remain fairly light with the thermal trough trying
to hug the coastline night and morning hours. Given the strength
of the ridge dont expect the marine layer to deepen too much
through the weekend and into early next week. There will likely be
bouts of morning dense fog near the coast and coastal slopes that
the marine layer covers as it gets squashed by the warm upper
ridge. Locations in the hills above 1500 feet will likely see
little night time variation with warm and dry weather persisting
day and night right through early next week.

In general the pattern the next few days looks to be fairly
typical but inland highs look to be about 4-8 degrees warmer than
normal due to the strong ridge and expected lighter afternoon
seabreezes.

Perhaps the most interesting forecast item to watch will be as the
remnants of tropical storm ivo shift northward by early next week.

The models have been fairly consistent in bringing the remnant
upper level disturbance west of the golden gate by about next
weds. We should see some increasing high clouds as early as
Tuesday night and feel some higher dewpoint air getting ushered in
under a gentle southerly flow.

Conceptually the pattern screams watch out as the tropical
remnants push north and bump up against the previously mentioned
stout upper ridge. As this occurs a mid-latitude trough will be
crossing the east pac and approaching from the northwest. This
will induce a negatively tilted upper trough. For days now the
models have been consistent in not really showing much moisture or
instability over our region. This should be viewed with some
skepticism. At this time its clear that the areas from mendocino
northward up towards mt shasta and modoc as well as much of oregon
look to see much better chances for t-storms as diffluent flow
aloft will develop. The latest 06z GFS implies a large t-storm
outbreak later weds night up near the oregon border. Will need to
watch all these trends closely in the coming days.

Aviation As of 4:56 am pdt Friday... A marine layer about 1000
feet deep has formed along the coast with stratus south of the
golden gate. Light southerly winds along the coast are slowly
expanding the stratus to the north. Inland areas and the terminals
near san francisco bay remainVFR early this morning. Given the
shallow marine layer and light onshore flow expect these sites to
remainVFR through the morning and into the afternoon. The
exception could be near koak where some CIGS may curl around the
eastern side of the bay near sunrise, but even this is unlikely.

High pressure building into the region should keep the marine
layer compressed with most inland sites remainingVFR this evening
and overnight tonight with CIGS returning near the coast.

Vicinity of ksfo...VFR is expected to continue this morning and
into the afternoon. Light winds this morning becoming westerly
around 15kt after 21z.VFR is expected to continue through the
evening and overnight, but lower confidence towards sunrise
Saturday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Lifr ifr CIGS this morning will continue
through 17-18z before clearing toVFR for the afternoon. Winds
onshore 10-15 kt this afternoon. A return to ifr CIGS this evening
with lower confidence on exact timing, with between 02-04z the
most likely.

Marine As of 03:10 am pdt Friday... Northwest winds will
decrease across the area today but remain breezy over the northern
outer waters. Steep northwesterly swell at 8 to 10 seconds will
decrease today through the weekend with period becoming 7 to 8
seconds over the weekend. A coastally trapped southerly wind
reversal will lead to light southwesterly winds over the waters
this weekend. A moderate southerly swell will arrive on Sunday
through early next week with light northwesterly swell continuing
through the period.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 9 am
sca... Sf bay from 9 am
public forecast: rww
aviation: st
marine: st
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi52 min SW 5.1 G 8 59°F 64°F1007.4 hPa
PXSC1 2 mi46 min 61°F 59°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi46 min W 4.1 G 7 60°F 1006 hPa
OBXC1 5 mi46 min 61°F 60°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi53 min SSE 4.1 60°F 1007 hPa (+0.0)
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi46 min W 2.9 G 5.1 1007.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi52 min WSW 8 G 8.9
AAMC1 - 9414750 - Alameda, CA 8 mi52 min W 5.1 G 7 61°F 72°F1007.5 hPa
LNDC1 8 mi46 min W 2.9 G 5.1 1007 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi46 min SW 12 G 15 61°F 1007.1 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi46 min 67°F
46237 - San Francisco Bar, CA (142) 10 mi64 min 61°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi46 min WSW 7 G 11 63°F 1006.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi24 min WNW 5.8 G 9.7 57°F 60°F1007.6 hPa
UPBC1 23 mi46 min WNW 8.9 G 14
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi52 min WNW 9.9 G 13 63°F 72°F1006.6 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi46 min NW 4.1 G 5.1 1007.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi46 min W 15 G 18 1006.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi46 min 1007 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi52 min NW 11 G 15 68°F 1005.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi79 min WNW 9.9 64°F 1006 hPa59°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA14 mi71 minNNW 37.00 miFair62°F57°F86%1007 hPa
San Francisco, San Francisco International Airport, CA14 mi68 minWNW 810.00 miFair59°F55°F87%1006.7 hPa
Hayward, Hayward Air Terminal, CA20 mi70 minN 010.00 miFair61°F55°F81%1007.6 hPa
Half Moon Bay Airport, CA21 mi69 minSE 52.50 miFog/Mist57°F57°F100%1008.1 hPa
Concord, Buchanan Field, CA24 mi71 minNNW 48.00 miFair64°F57°F81%1004.8 hPa
Novato / Gnoss Field, CA24 mi69 minN 010.00 miFair55°F51°F88%1006.8 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW10W9NW8NW7NW8N6NW10NW18W22W19W21W20W20W20W16----W12NW8----W7W6W8
1 day ago--W8W3E4E3NW9NW11NW15W19W22W20
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--------W9--NW6W10W9--

Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Fri -- 06:22 AM PDT     3.81 feet High Tide
Fri -- 06:32 AM PDT     Sunrise
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 11:11 AM PDT     2.63 feet Low Tide
Fri -- 02:06 PM PDT     Moonset
Fri -- 05:50 PM PDT     5.55 feet High Tide
Fri -- 07:52 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.72.12.73.23.63.83.83.53.12.82.62.73.13.64.355.45.55.34.63.62.61.7

Tide / Current Tables for Golden Gate Bridge .8 mi E ., San Francisco Bay, California Current
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Golden Gate Bridge .8 mi E .
Click for Map
Fri -- 01:55 AM PDT     0.00 knots Slack
Fri -- 04:41 AM PDT     1.79 knots Max Flood
Fri -- 06:32 AM PDT     Sunrise
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 07:59 AM PDT     -0.00 knots Slack
Fri -- 10:38 AM PDT     -1.31 knots Max Ebb
Fri -- 01:19 PM PDT     0.00 knots Slack
Fri -- 02:06 PM PDT     Moonset
Fri -- 04:37 PM PDT     1.71 knots Max Flood
Fri -- 07:28 PM PDT     -0.00 knots Slack
Fri -- 07:52 PM PDT     Sunset
Fri -- 11:09 PM PDT     -2.38 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.4-0.70.111.71.81.40.8-0-0.7-1.2-1.3-0.8-0.20.41.11.61.71.20.4-0.4-1.2-2-2.4

Weather Map and Satellite Images
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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (9,2,3,4)
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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.