Wednesday, March20, 2019 L-36.com


Marine Weather and Tides
Tamalpais-Homestead Valley, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:12AMSunset 7:23PM Wednesday March 20, 2019 2:05 AM PDT (09:05 UTC) Moonrise 6:14PMMoonset 6:21AM Illumination 99% Phase: Full Moon; Moon at 14 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- 905 Pm Pdt Tue Mar 19 2019
.small craft advisory in effect from 3 am pdt Wednesday through Wednesday evening...
Tonight..SW winds 10 to 20 kt...becoming southeast 15 to 25 kt after midnight. A chance of showers this evening, then showers likely after midnight.
Wed..SW winds 15 to 20 kt with gusts up to 30 kt. Showers likely and a slight chance of Thunderstorms.
Wed night..S winds 5 to 15 kt. A chance of showers.
Thu..SW winds 5 to 15 kt.
Thu night..W winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt. A chance of rain.
Fri night..SW winds 5 to 10 kt. Rain likely.
Sat..W winds 5 to 10 kt.
Sun..S winds up to 10 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 905 Pm Pdt Tue Mar 19 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty southerly winds continuing tonight ahead of an approaching low pressure system and cold front moving in from the west. Winds will shift back to the west and northwest later tomorrow. A long period west swell gradually diminishes late tonight and Wednesday. An additional long period west to northwest swell will arrive towards the end of the 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 200554
afdmtr
area forecast discussion
national weather service san francisco bay area
1054 pm pdt Tue mar 19 2019

Synopsis Rain showers will develop overnight into Wednesday
with a noted cooling trend. Isolated showers possible Thursday but
most places stay dry. Brief high pressure on Friday will keep
things dry. Next front passes through Friday night into early
Saturday with a period of light rain. Dry conditions Sunday with
rain chances returning later Monday through the middle of next
week.

Discussion As of 9:28 pm pdt Tuesday... Disorganized upper low
is starting to bring some light rain bands onshore along the
central coast. Would like to see some hints of cold air in the ir
satellite but not seeing those signals right now. Not seeing any
bucket tips yet but a few light showers will become likely over
the monterey bay region shortly. Latest model trends seem to be
trending a little drier with incoming rain chances. Nonetheless
expect most areas to receive some light rainfall overnight into
weds morning. Enough to impact the commute with wet roads as the
core of the upper low looks to rotate over the heart of the bay
area early weds morning. The air aloft will be much cooler which
in combination with cloud cover will lead to a noted cooling trend
for many places with temps only in the upper 50s and 60s for weds
afternoon.

Trend with secondary shortwave later weds night into Thursday has
been to stay offshore so only isolated precip chances into
Thursday and most likely focused central coast.

Higher confidence for a brief drying and warming trend Friday as
shortwave ridging develops. However, next front will be fast
approaching with some light rain chances Friday night into early
Saturday. Looks dry Saturday afternoon into Sunday with another
chance of rain later Monday into Tuesday.

Prev discussion As of 2:40 pm pdt Tuesday... A negatively
tilted trough continues to slowly approach california from the
west this afternoon. This storm system is aligned nearly parallel
with the coastline from point arena through santa barbara and has
already brought increased cloud cover, cooler temperatures, and
higher humidities to the region thus far today.

Southerly winds will progressively strengthen ahead of the cold
front through the remainder of the day, becoming gusty (peak
gusts up to 40-50mph in the windiest spots) along the coast and
over the higher terrain with breezy winds elsewhere.

Latest kmux radar imagery is detecting light reflectivity returns
ahead of the leading edge of a cold frontal boundary approximately
60 miles off of the coast. Despite the close proximity to the
area most models delay the onset of precipitation moving inland
until much later this evening, owing to the negative tilt and
sluggish speed of the parent trough. The latest model output has
decreased the overall precipitation intensity and coverage versus
previous runs. Storm total precipitation will range from 1.25-2.25"
for the higher terrain of the santa cruz and big sur mountains
while urban areas will generally range from 1 5" to 1 3", with
rain shadowed areas on the lower end of the spectrum. Hrrr model
output confines precipitation mostly in broken bands and scattered
showers wrapped closely on the eastern flank of upper low as it
lifts northeastward across the region. Previous model runs showed
somewhat more organization and strength than the current runs and
have reduced overall QPF as a result.

Models generally agree that precipitation should begin to spread
inland between 10pm and midnight tonight, however, a few precursor
showers could arrive in time for this evenings outbound commute.

Rain intensity and coverage should scale upwards after midnight as
the upper low shifts inland and lifts northeastward over the san
francisco bay area. Isolated thunderstorms will be possible
overnight tonight through Wednesday morning due to an increasingly
unstable environment advecting into the region. The overall
weaker model output from the latest runs may increase the
potential for thunderstorms Wednesday as a result increased cloud
breaks leading to more surface heating and further destabilization
of the atmosphere.

A secondary vorticity pulse on the rear flank of the broader
trough will descend into the local area later Wednesday into
Wednesday night and extend the possibility of a few lingering
showers potentially into early Thursday. Confidence is relatively
low regarding how this second disturbance will interact with the
initial disturbance with some models introducing an increased
chance of showers over the higher terrain into Thursday morning.

A transitory high pressure ridge will develop by midday Thursday
allowing for a brief warming drying trend, however, another storm
system is set to descend into the region from the gulf of alaska
by Friday morning. Fridays storm system will move from north to
south and bring the bulk of any precipitation to the north bay.

Precipitation along the north bay coastal range could approach
1.00" while the north bay valleys pick up 1 2 to 2 3". Much less
precipitation is expected south of the golden gate, with 1 4 to
1 3" in the immediate sf bay shoreline, and progressively less
farther southward.

Drier weather will prevail through most of the weekend with a
slight warming trend into Sunday but a third storm system will
begin to advance on the region early next week. Forecast models
and ensemble members continue to pepper later Monday through early
Wednesday as wet time periods, however, there is still a bit too
much noise to pin down exactly when, where, and how much to
expect.

Aviation As of 10:54 pm pdt Tuesday... Increasingly strong and
gusty winds through the evening, low level wind shear developing
nearest the coast with overlap extending north and east across the
remaining CWA later this evening. Showers arriving later in the
evening into Wednesday. Terminals reportingVFR thus far.

An amplifying and negatively tilted 500 mb height trough is approx
100 miles southwest of monterey county and moving north and will
sweep over the area through the evening and overnight. NAM model
shows fairly rapid cold air advection, near 7 celsius cooling at
925 mb and 850 mb levels and thermal troughing embedded with the
500 mb height trough indicating this trough has a fair amount of
dynamics and lift with it; expect rapidly changing weather conditions
through the evening into the overnight hours. No lightning seen yet
in our cwa, but there's a slight chance of thunderstorms mainly late
tonight into Wednesday morning.

Vicinity of ksfo... Increasingly strong and gusty winds through
tonight into early Wednesday morning. Low level wind shear through
15z Wednesday. Showers arrive overnight, some heavy.VFR-MVFR late
tonight into Wednesday morning.VFR Wednesday with a few showers,
gusty winds.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR-MVFR, low level wind shear otherwise
winds occasionally reaching to the ground via momentum transfer.

Strong and gusty SE winds in the salinas valley into Wednesday
morning. Showers arriving overnight into Wednesday morning, heavy
at times. Lingering showers andVFR Wednesday.

Marine As of 9:06 pm pdt Tuesday... Gusty southerly winds
continuing tonight ahead of an approaching low pressure system and
cold front moving in from the west. Winds will shift back to the
west and northwest later tomorrow. A long period west swell
gradually diminishes late tonight and Wednesday. An additional
long period west to northwest swell will arrive towards the end of
the week.

Mtr watches warnings advisories
Tngt 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... Pigeon pt to pt piedras blancas 10-60 nm
sca... Sf bay from 3 am
sca... Pt arena to pigeon pt 10-60 nm from 3 am
sca... Pt arena to pt reyes 0-10 nm from 3 am
sca... Rough bar advisory for sf bar
sca... Mry bay
public forecast: rww
aviation marine: canepa
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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 mi35 min ESE 1 G 2.9 54°F 55°F1012 hPa
46237 - San Francisco Bar, CA (142) 8 mi35 min 55°F7 ft
RCMC1 - 9414863 - Richmond, CA 9 mi35 min SSE 5.1 G 8.9 56°F 56°F1011.7 hPa
PXSC1 11 mi35 min 56°F 50°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi35 min SE 7 G 9.9 54°F 1010.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi35 min S 8.9 G 12 56°F 1012.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi35 min SSE 8 G 9.9
OBXC1 14 mi35 min 55°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi35 min S 6 G 8.9 54°F 1011.8 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi41 min SE 6 G 9.9 55°F 57°F1012.1 hPa
LNDC1 17 mi35 min SSE 6 G 8.9 55°F 1011.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi35 min SE 16 G 21 54°F 55°F1011.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi35 min NNE 7 G 8 55°F 1011.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 23 mi35 min 57°F1010.9 hPa
UPBC1 26 mi35 min SE 6 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi35 min SE 1.9 G 7 55°F 56°F1011.9 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi35 min E 6 G 6 54°F 56°F1012 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi35 min SE 4.1 G 7 56°F 61°F1012.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 36 mi80 min WNW 4.1 54°F 1012 hPa49°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi35 min SE 8 G 9.9 54°F 1012 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi35 min SSE 18 G 21 55°F1010.1 hPa
46214 - Point Reyes, CA (029) 48 mi35 min 55°F10 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi70 minN 010.00 miOvercast55°F50°F82%1011.8 hPa
San Francisco, San Francisco International Airport, CA22 mi69 minSE 1010.00 miOvercast56°F46°F72%1011.4 hPa
Oakland, Metro Oakland International Airport, CA23 mi72 minS 1510.00 miLight Rain57°F48°F72%1012.1 hPa

Wind History from DVO (wind in knots)
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Last 24hrS4N4CalmS6N6CalmS3CalmCalmE4Calm434SE5S4W12SW9SW3
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1 day agoCalmCalmCalmCalmCalmCalmCalmS5S7S6S94SE7E7SE7CalmS54N8N6N10N10N8NW5
2 days agoCalmCalmCalmN3CalmCalmCalmCalmCalmCalm4SE5
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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 -- 12:16 AM PDT     5.58 feet High Tide
Wed -- 05:50 AM PDT     1.04 feet Low Tide
Wed -- 07:13 AM PDT     Sunrise
Wed -- 07:20 AM PDT     Moonset
Wed -- 11:57 AM PDT     6.19 feet High Tide
Wed -- 06:17 PM PDT     -0.47 feet Low Tide
Wed -- 06:43 PM PDT     Full Moon
Wed -- 07:14 PM PDT     Moonrise
Wed -- 07:21 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.55.44.63.32.11.311.52.53.74.95.96.25.84.73.11.40.2-0.4-0.30.51.83.24.5

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
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Wed -- 01:22 AM PDT     -0.81 knots Max Ebb
Wed -- 03:55 AM PDT     0.00 knots Slack
Wed -- 06:14 AM PDT     1.24 knots Max Flood
Wed -- 07:13 AM PDT     Sunrise
Wed -- 07:19 AM PDT     Moonset
Wed -- 09:37 AM PDT     -0.00 knots Slack
Wed -- 01:40 PM PDT     -1.05 knots Max Ebb
Wed -- 04:30 PM PDT     0.01 knots Slack
Wed -- 06:43 PM PDT     Full Moon
Wed -- 06:49 PM PDT     1.34 knots Max Flood
Wed -- 07:14 PM PDT     Moonrise
Wed -- 07:21 PM PDT     Sunset
Wed -- 10:19 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.8-0.7-0.40.10.81.21.20.90.4-0.1-0.5-0.8-1-1-0.8-0.30.41.11.31.20.80.2-0.3

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 (5,6,7,8)
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Ground Weather Radar Station Sacramento, 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.