Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Tamalpais-Homestead Valley, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:56AMSunset 7:32PM Wednesday March 29, 2017 7:35 PM PDT (02:35 UTC) Moonrise 7:16AMMoonset 8:37PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 210 Pm Pdt Wed Mar 29 2017
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 10 to 20 kt.
Thu..NW winds 10 to 20 kt.
Thu night..NW winds 15 to 25 kt.
Fri..N winds 15 to 25 kt.
Fri night..NW winds 10 to 20 kt.
Sat..N winds 5 to 15 kt...becoming southwest 5 kt.
Sun..W winds 5 kt...increasing to 5 to 15 kt.
Mon..NW winds 5 to 15 kt.
PZZ500 210 Pm Pdt Wed Mar 29 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the california coast will keep moderate northwest winds through this evening. Winds will briefly decrease tonight as the high weakens but will increase again Thursday through Friday as strong low pressure develops over the intermountain region. Long period swells will continue through this evening. A larger long-period swell is expected to arrive Sunday night and Monday.

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 300059
afdmtr
area forecast discussion
national weather service san francisco bay area
559 pm pdt Wed mar 29 2017

Synopsis Cooler and breezy conditions return to the region
on Thursday as a cold front sweeps through overnight. This system
will result in a chance of very light precipitation from late
tonight into early Thursday morning, however most locations will
not receive measurable rainfall. Breezy to gusty winds will be
possible from late Thursday into Friday. A warming trend is then
expected for the upcoming weekend as high pressure rebuilds over
the region.

Discussion As of 01:56 pm pdt Wednesday... High pressure aloft
has resulted in mainly clear skies and seasonably mild
temperatures across the region this afternoon. Meanwhile,
unsettled conditions continue to impact the pacific northwest and
northern california as a system approaches from the north. This
system will dive southward overnight as the main mid/upper level
trough pushes inland well to our north. This system will bring a
slight chance of light precipitation to portions of the region
beginning late tonight over the north bay and then through the san
francisco bay area and central coast early Thursday morning. Most
of the short-rage models show this system producing only very
light rainfall amounts, generally a few hundredths of an inch or
so for locations that do experience precipitation. However, this
may result in wet roadways for the Thursday morning commute across
much of the greater san francisco bay area.

In wake of this frontal passage, daytime temperatures on Thursday
will be at least 5 to 10 degrees cooler compared to today.

Conditions will likely feel even cooler as breezy northerly winds
develop region-wide. Wind speeds are forecast to increase further
Thursday night into Friday as the main upper level system drops
southward into the desert southwest and surface pressure gradients
tighten along the coast. With this, the strongest winds are
likely in the higher elevations across the region with wind gusts
in excess of 45 mph likely. Thus, a wind advisory will likely be
posted overnight in the hills/mountains for the Thursday
night/Friday time frame.

While winds are forecast to diminish some late Friday into
Saturday, cannot rule out breezy conditions in some of the higher
elevations. However, a warming trend is expected for the weekend
as high pressure rebuilds back over the region as the mid/upper
level trough exits to the east. Temperatures fall back to near
seasonal averages for early next week as northwesterly flow aloft
returns and another weather system pushes inland to our north.

With that said, dry weather conditions are likely to persist for
our region through the middle of next week.

The longer range guidance continues to show a return to wet
weather conditions by late next week. The models generally agree
that a more potent weather system will drop southward into
northern california by Thursday or Friday of next week with a
moderate moisture tap. Both the GFS and ECMWF show widespread
rainfall across the region by next Friday. However, being more
than a week out, confidence remains low at this time and changes
to the forecast are likely.

Aviation As of 5:59 pm pdt Wednesday... Fragments of coastal
stratus /MVFR cigs/ are developing from sonoma county to san mateo
county. A more solid band of low clouds is advancing southeastward
across the northern coastal waters per visible imagery. 925 mb
level warming is cresting late this afternoon and early evening
which may initially help suppress incoming coastal stratus and fog
under compressed marine inversions. However, fairly rapid and
significant cooling follows later tonight and Thursday morning,
e.G. NAM output is consistent with forecasting upwards of 10
celsius cooling at 925 mb. Advertised surface cold front accelerates
southeastward across the bay area tonight and north central coast
early Thursday morning accompanied by pockets of light rain or
drizzle.

Vicinity of ksfo...VFR with westerly winds gusts to 25-30 knots.

Based on late afternoon visible imagery and area observations
decided to forecast onset of MVFR cig a little earlier, coordinated
with cwsu office. 00z TAF indicates tempo MVFR cig as early as
05z (not in taf, but cig development may be 1-2 hours earlier than
forecast based on low clouds rapidly advancing over the coastal
waters plus there's additional stratus development on the san mateo
coast at the moment). Drizzle or light rain forecast by 07z accompanied
by a period of ifr cig until greater cooling arrives later tonight/Monday
which should lift CIGS back to MVFR.VFR returns by 17z Thursday,
expect strong and gusty w-nw winds Thursday afternoon and evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR with westerly winds 10-15 knots this
evening. Stratus developing to the NW will likely focus on the
monterey peninsula this evening, moderate to high confidence ifr
cigs developing between 04z-07z ifr then prevailing with light
drizzle or rain developing late tonight into Thursday morning.

Marine As of 4:49 pm pdt Wednesday... High pressure off the
california coast will keep moderate northwest winds through this
evening. Winds will briefly decrease tonight as the high weakens
but will increase again Thursday through Friday as strong low
pressure develops over the intermountain region. Long period
swells will continue through this evening. A larger long-period
swell is expected to arrive Sunday night and Monday.

Mtr watches/warnings/advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm from 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
sca... Rough bar advisory for sf bar until 6 pm
sca... Mry bay until 3 am
sca... Sf bay until 9 pm
public forecast: rgass
aviation: canepa
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 8 mi47 min WSW 13 G 18
46237 - San Francisco Bar, CA (142) 8 mi65 min 56°F8 ft
RCMC1 - 9414863 - Richmond, CA 9 mi47 min NW 12 G 14
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi47 min NW 12 G 16 66°F 1020.1 hPa
PXSC1 11 mi47 min 59°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi47 min W 8 G 9.9 61°F 1020.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi47 min WSW 8.9 G 11
OBXC1 14 mi47 min 60°F 53°F
AAMC1 - 9414750 - Alameda, CA 16 mi47 min W 6 G 9.9 61°F 62°F1020.6 hPa
LNDC1 17 mi47 min W 8 G 11 63°F 1019.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi105 min NW 14 G 18 55°F 53°F8 ft1021.3 hPa (-0.4)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi47 min W 7 G 9.9 61°F 1019.5 hPa
UPBC1 26 mi47 min WNW 12 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi47 min W 11 G 12 63°F 58°F1019.4 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi47 min WSW 11 G 15 63°F 58°F1018.8 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi47 min W 14 G 17 62°F 62°F1019.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 36 mi110 min W 9.9 71°F 1018 hPa53°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi47 min WNW 8.9 G 14 64°F 1018.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi105 min WNW 18 G 21 56°F 56°F12 ft1020.9 hPa (-0.7)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi75 min WNW 23 G 27 55°F 55°F1021.1 hPa53°F
46214 - Point Reyes, CA (029) 48 mi43 min 55°F10 ft

Wind History for San Francisco, CA
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Last
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SW8
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S10
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W6
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi40 minS 810.00 miFair63°F50°F64%1019.6 hPa
San Francisco, San Francisco International Airport, CA22 mi39 minW 1610.00 miMostly Cloudy58°F50°F75%1020.7 hPa
Oakland, Metro Oakland International Airport, CA23 mi42 minW 168.00 miMostly Cloudy62°F55°F78%1020.2 hPa

Wind History from DVO (wind in knots)
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Last 24hr5NW12NW14NW15
G22
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G14
CalmCalmCalmCalmCalmCalmCalmNE3CalmN6CalmSW8N7NW10SW9SW6S10S9S9
G18
1 day agoNW8
G15
NW14NW12NW14NW12NW13
G21
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SW14CalmE4
2 days agoW9W10
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W7E4NE5CalmNW6NW5N9
G14
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W15W14
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Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sausalito
Click for Map
Wed -- 01:13 AM PDT     5.83 feet High Tide
Wed -- 06:59 AM PDT     Sunrise
Wed -- 07:23 AM PDT     -0.00 feet Low Tide
Wed -- 08:15 AM PDT     Moonrise
Wed -- 01:50 PM PDT     5.31 feet High Tide
Wed -- 07:30 PM PDT     Sunset
Wed -- 07:32 PM PDT     0.81 feet Low Tide
Wed -- 09:36 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.35.85.64.83.41.90.700.10.81.93.24.35.15.34.93.92.71.60.90.91.52.53.8

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
Click for Map
Wed -- 02:48 AM PDT     -0.96 knots Max Ebb
Wed -- 05:30 AM PDT     0.01 knots Slack
Wed -- 06:59 AM PDT     Sunrise
Wed -- 07:52 AM PDT     1.22 knots Max Flood
Wed -- 08:15 AM PDT     Moonrise
Wed -- 11:28 AM PDT     -0.00 knots Slack
Wed -- 03:13 PM PDT     -0.81 knots Max Ebb
Wed -- 05:44 PM PDT     0.00 knots Slack
Wed -- 07:30 PM PDT     Sunset
Wed -- 08:03 PM PDT     1.08 knots Max Flood
Wed -- 09:36 PM PDT     Moonset
Wed -- 11:24 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.7-0.9-1-0.7-0.20.411.21.10.70.3-0.2-0.5-0.7-0.8-0.7-0.30.20.81.110.70.2

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 (22,6,7,8)
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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.