Sunday, September24, 2017 L-36.com


Marine Weather and Tides
Tamalpais-Homestead Valley, 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 6:59AMSunset 7:03PM Sunday September 24, 2017 1:45 AM PDT (08:45 UTC) Moonrise 10:16AMMoonset 9:02PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 907 Pm Pdt Sat Sep 23 2017
Tonight..W winds 5 to 15 kt.
Sun..NW winds 5 to 15 kt.
Sun night..W winds 5 to 15 kt.
Mon..W winds 5 to 15 kt.
Mon night..W winds 5 to 15 kt.
Tue..W winds 5 to 15 kt.
Wed..NE winds 5 kt...becoming w.
Thu..NE winds 5 kt...becoming W 5 to 15 kt.
PZZ500 907 Pm Pdt Sat Sep 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwesterly winds will be gusty over the northern waters while winds over the remaining waters and bays remain light tonight. Surface high pressure situated offshore will also periodically build across northern nevada through early next week. A northwest swell train will arrive by the middle of next week.

7 Day Forecast for Marine Location Near Tamalpais-Homestead Valley, CA
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location: 37.89, -122.57     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 240529
afdmtr
area forecast discussion
national weather service san francisco bay area
1029 pm pdt Sat sep 23 2017

Synopsis Building high pressure near the west coast will
maintain dry weather through next week. A gradual warming trend
will continue through midweek.

Discussion As of 8:55 pm pdt Saturday... A warming trend got
underway today as northerly flow brought a drier airmass into the
region. Afternoon highs were generally 5 to 9 degrees warmer than
yesterday and were mostly in the 70s, except some low to mid 80s
inland. Most locations posted highs that were a few degrees warmer
than normal.

Not much change is expected going into Sunday. The airmass aloft
is forecast to warm a few degrees c as an upper trough over the
great basin continues moving to the east, while an upper ridge
offshore edges closer to the coast. Also, light northerly flow
aloft will continue to bring dry air into the region, which will
result in another day of clear skies across our entire region.

Although temps will start of relatively cool again, with early
morning lows in the 40s for most valley locations, high
temperatures on Sunday are forecast to be about 3-5 degrees warmer
than today.

The models agree that that the upper ridge offshore will continue
to build gradually eastward and over the west coast through the
middle of next week. 850 mb temperatures are forecast to climb
from their current value of about 11 degrees c to around 20 deg c
by midweek. In addition, light offshore flow is expected to
persist through at least Tuesday. The result will be a continued
warming trend region-wide through midweek. High temperatures will
be relatively uniform across the region due to light offshore
flow. Highs by Tuesday and Wednesday will be mostly in the 80s
except 70s very close to the ocean and lower to mid 90s in some of
the warmest inland areas. Even a slight increase in offshore flow
could easily result in downtown san francisco reaching 90 by
Tuesday or Wednesday. Because of the longer autumn nights and dry
airmass, we will continue to see relatively good overnight cooling
through the week ahead, which will help mitigate heat risks due
to elevated daytime temperatures.

Slightly cooler weather is projected to develop by late next week
as the upper ridge axis shifts inland and light onshore flow
develops. Even so, temperatures are expected to remain warmer than
normal.

Aviation As of 10:29 pm pdt Saturday... Light winds andVFR.

Patchy ifr CIGS are possible over the monterey bay early Sunday
morning.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Patchy ifr CIGS are possible around
sunrise.

Fire weather As of 5:00 pm pdt Saturday... A warming and drying
trend is forecast to continue into early next week as high
pressure builds over california. Relative humidity values will
drop into the teens during the afternoon hours while overnight
humidity recoveries will only reach about 30 percent in the higher
hills. In addition, light to moderate northerly or offshore winds
are forecast to continue in the hills. Strongest winds are
expected over the north bay hills where critical fire weather
conditions are anticipated. A red flag warning is in effect
through Tuesday morning for elevations above 1000 feet in the
north bay hills. Locally gusty winds are expected elsewhere in
the hills, particularly in the east bay hills. Warm and dry
conditions are forecast to persist through next week, although
winds in the hills will likely diminish after Tuesday.

Marine As of 10:13 pm pdt Saturday... Northwesterly winds will
be gusty over the northern waters while winds over the remaining
waters and bays remain light tonight. Surface high pressure
situated offshore will also periodically build across northern
nevada through early next week. A northwest swell train will
arrive by the middle of next week.

Mtr watches warnings advisories
Tngt Sca... Pt pinos to pt piedras blancas 0-10 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm
public forecast: dykema
aviation marine: canepa
fire weather: dykema
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 8 mi46 min 59°F4 ft
FTPC1 - 9414290 - San Francisco, CA 8 mi46 min S 1.9 G 4.1 58°F 63°F1013.1 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 9 mi46 min S 2.9 G 5.1 63°F 65°F1012.5 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi46 min S 6 G 8 63°F 1012.9 hPa (+0.0)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi58 min N 2.9 G 4.1 62°F 1011.7 hPa
PXSC1 11 mi46 min 62°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi46 min E 1.9 G 1.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi46 min 61°F 1012.7 hPa (+0.0)
OBXC1 14 mi46 min 61°F 54°F
AAMC1 - 9414750 - Alameda, CA 16 mi46 min Calm G 1 61°F 67°F1013.2 hPa (+0.0)
LNDC1 17 mi58 min NNE 2.9 G 5.1 62°F 1012.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi56 min NW 3.9 G 5.8 57°F 57°F6 ft1012.5 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi46 min WSW 2.9 G 5.1 61°F 1012.3 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 23 mi46 min W 5.1 G 8 62°F 55°F1012.3 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi46 min WNW 5.1 G 8 63°F 67°F1012.8 hPa (-0.0)52°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi46 min SSW 5.1 G 9.9 60°F 67°F1012.2 hPa (+0.0)
RTYC1 - 9414523 - Redwood City, CA 33 mi46 min E 1 G 1.9 60°F 68°F1012.1 hPa (+0.0)
SFXC1 - San Francisco Bay Reserve, CA 36 mi61 min NW 4.1 52°F 1011 hPa41°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi46 min WNW 8.9 G 12 67°F 1011.5 hPa (-0.3)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi56 min NW 7.8 G 9.7 60°F 61°F6 ft1012.4 hPa (-0.3)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi36 min NNW 12 G 16 59°F 58°F1012.9 hPa55°F
46214 - Point Reyes, CA (029) 48 mi46 min 60°F7 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi71 minN 010.00 miFair54°F39°F58%1012.9 hPa
San Francisco, San Francisco International Airport, CA22 mi1.8 hrsN 010.00 miFair60°F48°F65%1012.4 hPa
Oakland, Metro Oakland International Airport, CA23 mi53 minNE 610.00 miFair53°F48°F83%1012.7 hPa

Wind History from DVO (wind in knots)
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Last 24hr4NW12CalmCalmCalmCalmCalmNW13NW8N9
G15
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W13W14SW145CalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmS5SE64
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66SW8N7CalmCalmCalmCalmCalmCalmCalm
2 days agoW9
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N5CalmCalmCalm

Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sausalito
Click for Map
Sun -- 03:21 AM PDT     4.64 feet High Tide
Sun -- 06:59 AM PDT     Sunrise
Sun -- 08:54 AM PDT     2.09 feet Low Tide
Sun -- 11:16 AM PDT     Moonrise
Sun -- 03:02 PM PDT     5.35 feet High Tide
Sun -- 07:03 PM PDT     Sunset
Sun -- 09:38 PM PDT     0.79 feet Low Tide
Sun -- 10:01 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.73.54.24.64.64.13.42.82.32.12.32.93.74.55.15.35.14.53.42.31.40.90.81.2

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
Click for Map
Sun -- 01:03 AM PDT     -0.00 knots Slack
Sun -- 04:33 AM PDT     -0.56 knots Max Ebb
Sun -- 06:59 AM PDT     Sunrise
Sun -- 07:16 AM PDT     0.00 knots Slack
Sun -- 09:25 AM PDT     0.75 knots Max Flood
Sun -- 11:16 AM PDT     Moonrise
Sun -- 12:45 PM PDT     -0.00 knots Slack
Sun -- 04:50 PM PDT     -0.76 knots Max Ebb
Sun -- 07:03 PM PDT     Sunset
Sun -- 07:56 PM PDT     0.00 knots Slack
Sun -- 10:01 PM PDT     Moonset
Sun -- 10:12 PM PDT     0.85 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40-0.2-0.4-0.5-0.5-0.3-0.10.40.70.70.60.3-0.1-0.3-0.6-0.7-0.8-0.6-0.300.60.80.8

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 (4,6,7,8)
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Ground Weather Radar Station Sacramento, 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.