Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
Sausalito, 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 7:19AMSunset 6:29PM Tuesday October 17, 2017 5:14 PM PDT (00:14 UTC) Moonrise 4:08AMMoonset 4:47PM Illumination 6% Phase: Waning Crescent; Moon at 27 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- 230 Pm Pdt Tue Oct 17 2017
Tonight..SW winds 5 to 15 kt. Patchy smoke.
Wed..SW winds 10 kt...increasing to 10 to 20 kt in the afternoon. Patchy smoke.
Wed night..SW winds 10 to 20 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt. Chance of rain.
Fri..W winds 5 to 15 kt. Slight chance of rain.
Sat..W winds 10 kt.
Sun..W winds 10 kt.
PZZ500 230 Pm Pdt Tue Oct 17 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An upper level disturbance is currently progressing northeastward towards the southern end of the coastal waters. This system has been associated with light precipitation and lightning. There is still a chance of Thunderstorms to move over the southern waters this afternoon and evening. A trough and cold front is still forecast to move across the waters late Thursday. This system may bring light rain. A moderate to long period mixed northwesterly and southerly swell is expected this afternoon and tonight. Some buoys are already reporting periods of 18 to 19 seconds. Later this week a very large northwesterly swell train is forecast to arrive across the area. This large swell will create hazardous conditions.

7 Day Forecast for Marine Location Near Sausalito, CA
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location: 37.8, -122.5     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 172039
afdmtr
area forecast discussion
national weather service san francisco bay area
139 pm pdt Tue oct 17 2017

Synopsis After two very warm days, a gradual cooling trend is
forecast for today and tomorrow. The pattern will then change as
a system drops down from the north and brings generally light
rainfall to parts of the area late Thursday into Friday.

Discussion As of 1:39 pm pdt Tuesday... Mid and high level
clouds continue to stream over the san francisco bay area and
central california coast this afternoon as a vort MAX approaches
point conception. This has allowed for some showers and even a
some thunderstorms to develop offshore earlier this morning. While
the best chances for any shower and thunder activity will remain
in san luis obispo and santa barbara counties, can't rule out a
stray shower or even a few rumbles of thunder to make it into the
southern third of monterey county as well as over the southern
coastal waters south of big sur. This vort MAX will quickly push
east into kern county overnight and continue east on Wednesday.

Across the region this afternoon, temperatures are generally
running about 3 to 8 degrees cooler than what they were at this
time yesterday. This is largely due to a weak shortwave that has
rippled through the area that has allowed for 500 mb heights to
fall from 590 decameters in yesterday's 12z oakland sounding to
585 decameters at 12z today. Additionally dewpoints are generally
up by about 3 to 9 degrees compared to yesterday. When all is set
and done today, expect high temperatures to reach the middle 60s
to middle 70s along the coast and middle 70s to middle 80s for
interior areas.

Temperatures are expected to continue a downward trend through
the end of the week as an upper level low currently centered south
of the aleutian islands is forecast to slide southeastward toward
coastal british columbia by early Thursday. A front will extend
southward along the pacific northwest and into parts of northern
california, and will bring with it increasing chances of rain by
late Thursday and overnight into Friday morning. At this point,
models are becoming more consistent run-to-run and are advertising
up to around 0.25" in the north bay, up to 0.10" around san
francisco, and maybe up to a few one-hundredths around monterey.

Motorists should be prepared for locally wet and or slick roadways
during the Friday morning commute, particularly those commuting
in around the north bay.

Skies will eventually clear by the afternoon hours for many as the
decaying frontal system passes through. Forecast models continue
to advertise a building ridge over california heading into the
weekend and into early next week. This will result in a warming
and drying trend as temperatures climb back to above normal
levels.

Aviation As of 10:40 am pdt Tuesday... For 18z tafs. Currently
vfr to MVFR conditions across the area with smoke from various
wildfires reducing visibilities. Winds will begin to transition to
onshore flow later today remaining relatively light. Patchy
coastal stratus and fog may return to the immediate coast this
evening, as of now not expecting low CIGS to impact terminals
aside from possibly kmry and ksns tomorrow morning.

Vicinity of ksfo...VFR with haze from wildfire smoke. Latest hrrr
smoke forecast suggests visibilities will improve this afternoon.

Winds light and variable until 22z then nw-n near 10 knots into
the evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR, with reduced visibilities to MVFR
possible today due to the wildfire in the santa cruz mountains.

Stratus to return late tonight or early tomorrow morning. Latest
guidance suggests ifr CIGS will hold off until early tomorrow
morning, tafs will be updated should this change.

Fire weather As of 10:35 pm pdt Monday... A pattern change is
on the way, with a general cooling, moistening trend and the
possibility of wetting rains arriving this week. Winds will begin
to shift and become more onshore tonight, helping to bring the
cooler temps, moister air mass, and improved air quality for many
areas. Temperatures will decrease a few to several degrees each of
the next 3 days, returning to near normal temperatures by mid
week. Humidities will also increase given the cooler temperatures
and onshore flow. Some uncertainty regarding the upcoming rains.

A convective complex off of the baja california coast located on
the southwestern flank of the exiting ridge will bring a slight
chance of thunderstorms southern monterey and san benito counties
from late this morning through the evening.

Model data now indicates light non-wetting warm sector precip
arriving late morning Thursday, while the main band of cold
frontal precipitation arriving Thursday evening through Friday
morning. This system will bring wetting rains to some areas but
not others, with the best chance of wetting rains over the north
bay mountains and hills, where fires are most active. Much less
precipitation is expected farther southward and or at lower
elevations.

Marine As of 01:26 pm pdt Tuesday... A system is currently
moving to the northeast towards the coastal waters that has
lightning associated with it. This will bring a chance of
thunderstorms to the southern waters late this morning and into
this evening. A trough and cold front will move across the
coastal waters from the gulf of alaska late Thursday. The cold
front will be accompanied by light rain. A moderate to long
period mixed northwesterly and southerly swell is expected this
afternoon and tonight. A very large northwesterly swell train, the
largest of the season to date, will then arrive over the waters
Thursday night lasting through the period. This large swell will
create hazardous conditions.

Mtr watches warnings advisories
Tday None.

Public forecast: rowe
aviation: as
marine: as
fire weather: 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 2 mi44 min WSW 15 G 19 54°F 57°F1018.1 hPa
PXSC1 5 mi44 min 66°F 50°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 6 mi44 min W 9.9 G 13 66°F 1016.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi52 min S 1.9 71°F 1017 hPa
46237 - San Francisco Bar, CA (142) 7 mi44 min 56°F4 ft
OBXC1 8 mi44 min 66°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 9 mi44 min NW 8 G 8.9 62°F 1017.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 9 mi44 min WNW 8 G 9.9
RCMC1 - 9414863 - Richmond, CA 10 mi44 min SE 2.9 G 9.9 63°F 60°F1017.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 10 mi44 min SW 5.1 G 11 64°F 1017.7 hPa
AAMC1 - 9414750 - Alameda, CA 11 mi44 min W 2.9 G 4.1 67°F 63°F1018 hPa
LNDC1 12 mi44 min W 5.1 G 7 71°F 1017.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 18 mi84 min NW 12 G 14 51°F 56°F5 ft1018.7 hPa (-0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 22 mi44 min W 5.1 G 6 73°F 1016.5 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi44 min NNW 6 G 8 71°F 66°F1016.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi44 min Calm G 1 78°F 63°F1017.1 hPa33°F
PRYC1 - 9415020 - Point Reyes, CA 29 mi44 min NW 12 G 15 57°F1018.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi44 min NE 1.9 G 1.9 75°F 64°F1016.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 36 mi44 min NW 1 G 1.9 77°F 1016.6 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi84 min NW 14 G 16 53°F 55°F6 ft1018.2 hPa (-1.1)
SFXC1 - San Francisco Bay Reserve, CA 37 mi89 min SSW 2.9 79°F 1017 hPa43°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi18 minWNW 1410.00 miMostly Cloudy66°F46°F49%1017.2 hPa
Oakland, Metro Oakland International Airport, CA16 mi21 minWNW 710.00 miMostly Cloudy67°F54°F63%1017.4 hPa
Half Moon Bay Airport, CA20 mi19 minNNW 82.00 miFog/Mist54°F50°F88%1017.6 hPa
Hayward, Hayward Air Terminal, CA22 mi20 minWNW 88.00 miFair73°F46°F40%1018 hPa
San Carlos Airport, CA23 mi87 minN 63.00 miSmoke Haze81°F48°F32%1017.9 hPa
Novato / Gnoss Field, CA24 mi39 minN 010.00 miFair81°F37°F21%1016.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrCalmN3W9W5CalmCalmCalmCalmCalmCalmW5CalmCalmCalmS3CalmN3CalmE4N3NE4NW8NW8NW13
1 day agoCalmCalmCalmCalmCalmS4S3CalmCalmCalmCalmCalmCalmCalmCalmCalmNE3NE3NE5N5NE3N5N3Calm
2 days agoN4CalmE3E3W7W5CalmCalmS3CalmCalmS3S3CalmSE4S5SE7SE7SE6E3N5N5CalmN3

Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Tue -- 04:10 AM PDT     0.52 feet Low Tide
Tue -- 05:07 AM PDT     Moonrise
Tue -- 07:20 AM PDT     Sunrise
Tue -- 10:56 AM PDT     5.91 feet High Tide
Tue -- 04:45 PM PDT     0.80 feet Low Tide
Tue -- 05:47 PM PDT     Moonset
Tue -- 06:29 PM PDT     Sunset
Tue -- 11:06 PM PDT     5.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.53.21.90.90.50.71.42.43.64.75.65.95.54.43.11.810.81.22.13.14.25.15.5

Tide / Current Tables for San Francisco Bay Entrance (Golden Gate), California Current
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San Francisco Bay Entrance (Golden Gate)
Click for Map
Tue -- 02:54 AM PDT     -3.78 knots Max Ebb
Tue -- 05:07 AM PDT     Moonrise
Tue -- 06:30 AM PDT     0.00 knots Slack
Tue -- 07:20 AM PDT     Sunrise
Tue -- 09:34 AM PDT     3.67 knots Max Flood
Tue -- 12:29 PM PDT     -0.00 knots Slack
Tue -- 03:25 PM PDT     -3.77 knots Max Ebb
Tue -- 05:47 PM PDT     Moonset
Tue -- 06:29 PM PDT     Sunset
Tue -- 06:59 PM PDT     0.00 knots Slack
Tue -- 09:58 PM PDT     3.51 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-2.2-3.5-3.8-3.4-2.6-112.73.53.62.81.1-1.1-2.9-3.7-3.7-3.1-1.801.93.13.53.1

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 (20,4,5,8)
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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.