Friday, February15, 2019 L-36.com


Marine Weather and Tides
Belvedere, 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 6:57AMSunset 5:49PM Friday February 15, 2019 11:52 AM PST (19:52 UTC) Moonrise 1:37PMMoonset 3:31AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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- 857 Am Pst Fri Feb 15 2019
.small craft advisory in effect through this evening...
Today..SW winds 15 to 25 kt. Showers in the morning. Slight chance of Thunderstorms through the day. Showers likely in the afternoon.
Tonight..SW winds 10 to 20 kt. Showers likely.
Sat..W winds 5 to 15 kt. Chance of showers.
Sat night..W winds 5 to 15 kt. Slight chance of showers.
Sun..NW winds 5 to 15 kt. Slight chance of showers.
Washingtons birthday..NW winds 5 to 15 kt.
Tue..NW winds 5 to 15 kt.
PZZ500 857 Am Pst Fri Feb 15 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Cooler temperatures, gusty west to northwest winds, scattered showers and possibly a few Thunderstorms will continue into the weekend. A large northwest swell will arrive across the waters today and continue into the weekend.


7 Day Forecast for Marine Location Near Belvedere, CA
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location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 151759
afdmtr
area forecast discussion
national weather service san francisco bay area
959 am pst Fri feb 15 2019

Synopsis Cool and showery conditions are expected today
through the weekend as a cold upper trough digs south along the
west coast. Snow levels will lower Friday into Saturday with the
potential for accumulating snowfall in the region's highest peaks.

Overnight temperatures will turn much colder by early next week
as dry weather develops and skies clear. Unsettled conditions
could return for the latter half of next week.

Discussion As of 09:11 am pst Friday... No major changes to the
forecast this morning as isolated to scattered showers continue to
move inland across the region. As expected, numerous reports of
very small hail are being reported region-wide as cold air
advection continues aloft. This too has resulted in lowering snow
levels with air temperature below freezing in the region's highest
peaks. Thus, cannot rule out snow showers in those higher
elevations.

Showers will persist as a reinforcing colder mid upper level
trough descends southward along the west coast through the
weekend. This too will lower snow levels with increasing chances
for accumulating snowfall in elevations above 2,500-3,000 feet
while rain showers persist off and on across the region. Will have
additional updates and details with respect the forecast for the
remainder of the weekend this afternoon. Until then, please see
the previous forecast discussion below.

Prev discussion As of 2:53 am pst Friday... A line of showers
moved through the district earlier producing brief, heavy rain as
it passed. This line was associated with a cold front that has
moved through. Scattered showers are expected to persist today
through the weekend as the area remains in a cold, unstable
airmass.

Temperatures have dropped considerably with the passage of the
cold front. Current readings at area airports are generally 15
degrees colder than they were 24 hours ago with mid to upper 40s
being reported. At higher elevations, automated weather stations
are picking up current temperatures in the 30s and lower 40s. Snow
levels are forecast to drop as low as 2500 feet today and perhaps
below 2000 feet by late Saturday night. Thus, snowfall is likely
on bay area peaks and accumulating snowfall is likely above 3000
feet. Also, small hail is likely at times with heavier showers.

Flood waters continue to recede in most areas. The flood warning
for the carmel river was cancelled last night, however, water
levels on the lower russian river continue to rise and is forecast
to crest within the next hour or two. A flood warning remains in
effect for the russian river near guerneville.

Drier weather is forecast to return by the beginning of the week.

Clearing skies will result in cold overnight temperatures.

Unsettled weather is possible by midweek.

Aviation As of 9:59 am pst Friday... Showers will continue
across area terminals today in the cold post frontal environment.

Vfr except MVFR in heavy showers, steadily lowering freezing
levels with snow at highest elevations through the weekend. Deeper
layer cooling arrives from the north later today, 500 mb
temperatures exceeding -30 celsius into tonight. Steepening
temperature lapse rates initiating isolated thunderstorms favoring
the bay area by late afternoon and evening, convective potential
up to several hundred j kg; will amend to add thunderstorms in
tafs as needed. Generally much less wind today, though
occasionally gusts to 20-25 knots nearest showers or isolated
thunderstorms are possible.

Vicinity of ksfo...VFR, gusty wind to 20-25 knots today. Showers
today tempo MVFR in showers mid to late evening.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR except MVFR in showers particularly
this morning. SE wind becoming onshore and locally gusty to 20
knots by late morning. More showers arriving tonight and Saturday
morning.

Beaches 25 feet swell with moderate period 16 seconds reported
from buoy 59 located 400 miles northwest of the bay area. Large,
dangerous surf will reach the coastal waters today, a high surf
advisory begins 10 am today continuing to 9 pm Saturday. Northwest
swell 14 to 17 feet will produce breakers as high as 18 to 25 feet
along west and northwest facing beaches. High surf will also bring
coastal flooding impacts during high tide today. A coastal flood
advisory is in effect 5 am to 10 am this morning.

Marine As of 09:42 am pst Friday... Cooler temperatures, gusty
west to northwest winds, scattered showers and possibly a few
thunderstorms will continue into the weekend. A large northwest
swell will arrive across the waters today and continue into the
weekend.

Mtr watches warnings advisories
Tday High surf advisory... Caz006-505-509-529-530
coastal flood advisory... Caz006-505-506-508-509-529-530
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
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Rough bar advisory for sf bar
sca... Sf bay
sca... Mry bay
public forecast: rgass sims
aviation: cw
marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi40 min WSW 1.9 G 12 52°F 54°F1016.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi34 min WSW 5.1 G 13 53°F 1014.7 hPa
PXSC1 3 mi34 min 53°F 41°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi53 min NE 1.9 52°F 1016 hPa
OBXC1 6 mi34 min 52°F 41°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi34 min SW 12 G 20 52°F 1015.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi34 min SW 16 G 26
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi34 min WSW 11 G 17 53°F 1015.8 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi34 min 53°F
AAMC1 - 9414750 - Alameda, CA 8 mi40 min WSW 15 G 19 51°F 52°F1016.4 hPa
LNDC1 9 mi34 min SW 11 G 22 52°F 1015.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi34 min W 7 G 12 51°F 1015.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi32 min W 18 G 23 52°F 55°F1016.4 hPa
UPBC1 22 mi34 min WSW 12 G 21
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi34 min SW 13 G 18 51°F 51°F1015.3 hPa46°F
RTYC1 - 9414523 - Redwood City, CA 25 mi34 min S 8 G 13 52°F 53°F1016.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi34 min SW 11 G 18 51°F 50°F1015.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi34 min 55°F1015.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi34 min WSW 5.1 G 7 51°F 1015.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi67 min WNW 8.9 45°F 1015 hPa41°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA15 mi59 minSW 1510.00 miMostly Cloudy54°F39°F59%1016.3 hPa
San Francisco, San Francisco International Airport, CA15 mi56 minSW 20 G 259.00 miLight Rain and Breezy53°F42°F66%1015.8 hPa
Hayward, Hayward Air Terminal, CA21 mi58 minSSW 1110.00 miMostly Cloudy53°F41°F64%1017 hPa
Concord, Buchanan Field, CA23 mi59 minSW 1410.00 miPartly Cloudy53°F39°F59%1014.1 hPa
San Carlos Airport, CA23 mi65 minSSW 85.00 miLight Rain50°F39°F67%1015.9 hPa
Novato / Gnoss Field, CA23 mi57 minW 14 G 271.50 miRain45°F41°F87%1016.3 hPa

Wind History from SFO (wind in knots)
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1 day agoSE7SE10S25
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2 days agoCalmCalmE9SE7SW4NE4E4E7SE12E6SE9E9E17E10SE13
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SE21E17E18E20E22E15E11

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Fri -- 01:11 AM PST     2.98 feet Low Tide
Fri -- 03:30 AM PST     Moonset
Fri -- 06:59 AM PST     Sunrise
Fri -- 07:24 AM PST     6.14 feet High Tide
Fri -- 01:36 PM PST     Moonrise
Fri -- 02:33 PM PST     -0.27 feet Low Tide
Fri -- 05:48 PM PST     Sunset
Fri -- 09:52 PM PST     4.53 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.233.13.64.255.76.165.54.32.91.50.4-0.2-0.20.211.92.93.74.44.54.3

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Fri -- 02:48 AM PST     0.00 knots Slack
Fri -- 03:30 AM PST     Moonset
Fri -- 05:49 AM PST     1.91 knots Max Flood
Fri -- 06:59 AM PST     Sunrise
Fri -- 08:56 AM PST     -0.00 knots Slack
Fri -- 12:14 PM PST     -2.76 knots Max Ebb
Fri -- 01:36 PM PST     Moonrise
Fri -- 04:00 PM PST     0.00 knots Slack
Fri -- 05:48 PM PST     Sunset
Fri -- 07:10 PM PST     2.80 knots Max Flood
Fri -- 10:47 PM PST     -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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-1.2-0.9-0.50.111.71.91.60.9-0.1-1.2-2.2-2.7-2.6-2-1.1-01.42.42.82.62.11-0.2

Weather Map and Satellite Images
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wmap_P
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 (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, 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.