Wednesday, January17, 2018 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 7:22AMSunset 5:19PM Wednesday January 17, 2018 12:46 AM PST (08:46 UTC) Moonrise 7:46AMMoonset 6:07PM Illumination 0% Phase: New Moon; Moon at 1 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
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 905 Pm Pst Tue Jan 16 2018
Tonight..E winds 10 kt. Patchy fog after midnight.
Wed..NE winds 10 kt...becoming S in the afternoon. Patchy fog in the morning.
Wed night..S winds 5 to 15 kt. Slight chance of rain after midnight.
Thu..S winds 10 to 20 kt. Chance of rain.
Thu night..W winds 5 to 15 kt. Chance of showers.
Fri..W winds 5 to 15 kt. Chance of showers, then slight chance of showers.
Sat..W winds 10 kt. Slight chance of rain.
Sun..S winds 5 to 15 kt. Chance of rain, then rain likely.
PZZ500 905 Pm Pst Tue Jan 16 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A high pressure ridge will remain stationary over the california coastal waters tonight and Wednesday then slowly drift southward and weaken Thursday. A deep low pressure system 1,000 miles west of oregon this evening will move northeastward into the gulf of alaska Wednesday and Wednesday night becoming nearly stationary off the british columbia coast through late week. A 1032 mb high over the central pacific will strengthen as it moves eastward and settles over the eastern pacific late this week and weekend. Very large swell, the largest swell of this season so far, will impact beaches later this week.

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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 170648
afdmtr
area forecast discussion
national weather service san francisco bay area
1048 pm pst Tue jan 16 2018

Synopsis Mostly cloudy and mainly dry conditions are forecast
to persist into Wednesday ahead of our next approaching storm
system. This system will bring rain to the region late Wednesday
into Thursday with lingering post frontal showers. Cooler
temperatures are forecast over the weekend with dry weather for
much of the region before another system arrives late Sunday or
Monday.

Discussion As of 8:51 pm pst Tuesday... A few showers fell
across the north bay over the last 6 hours resulting in a few
tips of the bucket here and there. Atlas peak and hawkeye both
reported 0.02" while oak ridge received 0.03". While doppler
radar continues to pick up a few returns over the north bay there
hasn't been any precip reported over the last hour. A stray shower
cannot be ruled out but chances will continue to diminish
overnight. Mild and dry conditions are forecast for Wednesday as
weak ridging prevails across the region.

A pattern shift is expected Wednesday night as the next in a
series of storms sweeps across the region. This next system is
anticipated to approach the north bay Wednesday with showers
possible as early as Wednesday evening. The main rain band will
push through the north bay late Wednesday night into early
Thursday morning. Rain will spread southward into the greater bay
area Thursday morning leading to a wet morning commute.

From previous discussion... This system does appear to produce a
bit more precipitation than the one that moved through last
night today. However, it too will be quick moving and result in
rainfall amounts of 1 3" to 1 5" for the north bay with isolated
amounts near 1.00" in the coastal ranges of that region. To the
south, most urban areas will see less than 1 3" with even less
than 1 4" for the monterey bay region and inland valleys. Coastal
ranges along the central coast can expect around 1 4" to 1 3" with
isolated amounts up to 1 2" through Thursday. Post frontal
showers are then expected late Thursday into Friday as a more
unstable and colder air mass advects southward into the region. At
this point, snow levels are forecast to drop to or below 3,500
feet with light snow accumulation possible in the highest peaks
across the region. Also cannot rule out a thunderstorm or two over
the northern coastal waters Thursday night into Friday.

With the colder air mass in place, overnight morning temperatures
are likely to fall into the 30s and lower 40s for most urban areas.

While widespread freezing conditions are unlikely, these conditions
may impact pets and vulnerable populations. Mostly dry conditions
expected for Saturday outside of light rain possible across the
north bay ahead of our next storm system.

There continues to be difference and inconsistencies in the medium
range forecast models with respect to the next system due to arrive
Sunday into Monday. The latest ECMWF has trended much drier with a
more progressive system sweeping through. The GFS remains a bit
wetter, yet too moves the system through from north to south Sunday
night into Monday. The canadian solution stalls the system over
northern california Sunday night into Monday before dropping
southward and weakening on Tuesday. Thus, will keep rain chances in
the extended with low confidence on details at this time.

Aviation As of 10:48 pm pst Tuesday... The air is saturated to
nearly saturated per area METAR and mesowest observations showing
widespread air and dewpoint temperatures upper 40s to the 50s this
evening. Lower-mid level thermal and geopotential height ridging
over the bay area tonight is resulting in increased subsidence
trapping increasing amounts of stratus and fog near the surface.

This has been resulting in increasing coverage of lifr vlifr cigs
and visibilities in particular along the coast through this evening.

Cooler air from the surface to the 925 mb level continues to drain
in from the northwest tonight and Wednesday while a slow moving
warm front approx 400 miles west of the bay area will eventually
reach our coastal waters Wednesday evening. Newly arriving ecmwf
model output this evening indicates this warm front will move eastward
over the forecast area late Wednesday night into Thursday. In the
interim very widely spotty light rain tonight, then a little more
organized light rain arrives Wednesday evening and night. Nw-ne winds
will be mainly light.

Vicinity of ksfo... MVFR ifr tonight. A saturated air mass tonight
and Wednesday morning is making for a not very optimistic TAF outlook
into Wednesday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... 1 4 mile visibilities reported around the
monterey bay this evening. Lifr vlifr tonight and Wednesday morning.

Improvement in CIGS and visibilities will probably be slow going
Wednesday. Low confidence MVFR returns Wednesday afternoon and
evening.

Marine As of 9:58 pm pst Tuesday... A high pressure ridge will
remain stationary over the california coastal waters tonight and
Wednesday then slowly drift southward and weaken Thursday. A deep
low pressure system 1,000 miles west of oregon this evening will
move northeastward into the gulf of alaska Wednesday and Wednesday
night becoming nearly stationary off the british columbia coast
through late week. A 1032 mb high over the central pacific will
strengthen as it moves eastward and settles over the eastern
pacific late this week and weekend. Very large swell, the largest
swell of this season so far, will impact beaches mid to late week.

Mtr watches warnings advisories
Tngt Sca... Rough bar advisory for sf bar
public forecast: cw rgass
aviation marine: canepa
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
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi43 min WSW 1.9 55°F 1024 hPa
FTPC1 - 9414290 - San Francisco, CA 8 mi47 min NNE 4.1 G 5.1 55°F 54°F1023.9 hPa (+0.0)
46237 - San Francisco Bar, CA (142) 8 mi77 min 53°F10 ft
RCMC1 - 9414863 - Richmond, CA 9 mi47 min NNW 7 G 8 55°F 53°F1023.4 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi47 min NNW 8 G 8.9 55°F 1023.8 hPa (+0.0)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi47 min N 1 G 1 55°F 1022.5 hPa (+0.0)
PXSC1 11 mi47 min 56°F 56°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi47 min E 1 G 1.9
OBXC1 14 mi47 min 55°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi47 min 54°F 1023.4 hPa (+0.0)
AAMC1 - 9414750 - Alameda, CA 16 mi47 min SW 1.9 G 1.9 54°F 55°F1023.5 hPa (+0.0)
LNDC1 17 mi47 min S 1.9 G 2.9 55°F 1023.3 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi57 min NW 3.9 G 5.8 53°F 54°F10 ft1023.7 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi47 min E 2.9 G 4.1 53°F 1023.4 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 23 mi47 min Calm G 1.9 55°F1023.4 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi47 min ENE 4.1 G 5.1 52°F 52°F1023.8 hPa (+0.0)52°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi47 min ENE 5.1 G 5.1 52°F 51°F1023.6 hPa (+0.0)
RTYC1 - 9414523 - Redwood City, CA 33 mi47 min WSW 2.9 G 4.1 56°F 55°F1024 hPa (+0.3)
SFXC1 - San Francisco Bay Reserve, CA 36 mi62 min NE 1 50°F 1024 hPa50°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi47 min SE 6 G 7 51°F 1023.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi57 min NNW 7.8 G 9.7 56°F 56°F15 ft1023.1 hPa (+0.4)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi37 min NNW 3.9 G 5.8 56°F 56°F1024.4 hPa55°F
46214 - Point Reyes, CA (029) 48 mi47 min 56°F13 ft

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
-12
PM
-12
PM
-12
PM
-12
PM
-12
PM
-12
PM
-12
PM
-12
PM
-12
PM
-12
PM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
Last
24hr
N4
N3
N6
N4
G7
N7
N7
N6
N9
N7
N8
N3
N7
E3
N4
1 day
ago
N8
NE6
G13
NE10
G14
N11
G14
N8
G11
N11
N11
G14
N10
G13
NE9
G12
NE4
NE5
G8
E2
E2
NE1
2 days
ago
N17
NE15
N14
G17
N14
G17
N14
N13
G16
NE10
N11
N13
N12
G15
N14
N8
G15
N12
G15
N11
N8
NE8
G11
NE10
N14
G17
N10
G15
N9
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi52 minS 44.00 miFog/Mist55°F53°F94%1024 hPa
San Francisco, San Francisco International Airport, CA22 mi51 minN 09.00 miOvercast56°F53°F90%1023.4 hPa
Oakland, Metro Oakland International Airport, CA23 mi54 minN 09.00 miPartly Cloudy54°F53°F97%1023.9 hPa

Wind History from DVO (wind in knots)
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
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
Last 24hrCalmCalmCalmCalmS5SE7S4SW3SW6CalmSW3CalmS3SE4S5SW5S4CalmSW4CalmCalmCalmCalmS3
1 day agoS5S6S7S8S4S4E4S8SE5CalmS6CalmSE6CalmSE4CalmCalmCalmCalm--CalmSW3S4Calm
2 days agoS8S5S6S5S7S7S6S6SE6
G11
SE7SE8SE6SE9SE7S8SE6S7S54S4S5
G11
S6SE4S7

Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Sausalito
Click for Map
Wed -- 12:47 AM PST     4.71 feet High Tide
Wed -- 05:33 AM PST     2.92 feet Low Tide
Wed -- 07:23 AM PST     Sunrise
Wed -- 07:44 AM PST     Moonrise
Wed -- 11:18 AM PST     5.95 feet High Tide
Wed -- 05:16 PM PST     Sunset
Wed -- 06:06 PM PST     Moonset
Wed -- 06:14 PM PST     -0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.64.74.43.93.3333.344.85.55.95.85.13.92.410-0.4-0.30.41.42.53.5

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Richardson Bay Entrance
Click for Map
Wed -- 01:14 AM PST     -0.42 knots Max Ebb
Wed -- 03:40 AM PST     0.00 knots Slack
Wed -- 05:51 AM PST     0.74 knots Max Flood
Wed -- 07:23 AM PST     Sunrise
Wed -- 07:44 AM PST     Moonrise
Wed -- 09:02 AM PST     -0.01 knots Slack
Wed -- 01:22 PM PST     -0.92 knots Max Ebb
Wed -- 04:34 PM PST     0.01 knots Slack
Wed -- 05:16 PM PST     Sunset
Wed -- 06:06 PM PST     Moonset
Wed -- 06:55 PM PST     1.02 knots Max Flood
Wed -- 10:41 PM PST     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.4-0.4-0.20.10.60.70.60.40-0.3-0.6-0.8-0.9-0.9-0.6-0.20.30.910.90.70.3-0.1

Weather Map and Satellite Images
       (on/off)   Help
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 (3,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Sacramento, 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.