Friday, March24, 2017 L-36.com


Marine Weather and Tides
Belvedere, 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 7:03AMSunset 7:27PM Friday March 24, 2017 7:11 AM PDT (14:11 UTC) Moonrise 4:06AMMoonset 3:02PM Illumination 10% Phase: Waning Crescent; Moon at 27 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- 221 Am Pdt Fri Mar 24 2017
.small craft advisory in effect from 5 am pdt early this morning through this afternoon...
Today..S winds 15 to 25 kt. Rain.
Tonight..W winds 5 to 15 kt. Showers likely in the evening, then slight chance of showers after midnight.
Sat..W winds 5 to 15 kt.
Sat night..W winds 10 to 20 kt.
Sun..SW winds 5 to 15 kt. Showers likely.
Mon..W winds 5 to 15 kt. Slight chance of showers.
Tue..W winds 5 to 15 kt.
PZZ500 221 Am Pdt Fri Mar 24 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Occasional gale force gusts are possible through the day today as a storm system impacts the region with strong southerly winds and rain. Seas will be rough with the frontal passage...but should begin to decrease by this evening. Expect northwest winds to return by Saturday morning before briefly becoming southerly on Sunday as another weak system moves over the waters.

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 241257
afdmtr
area forecast discussion
national weather service san francisco bay area
557 am pdt Fri mar 24 2017

Rain and gusty southerly winds return today...

Synopsis Rain and wind will spread southward today across the
forecast area as a cold front moves across the region. A break in
the rain is expected Saturday with showers anticipated to return
Sunday afternoon and night as a low pressure system moves through.

Discussion As of 2:51 am pdt Friday... The approaching system is
taking its time reaching us, but kmux radar is starting to fill in
with stronger reflectivities off the coast. So far, only a couple
hundredths of an inch have been picked up by rain gauges in the
north bay.

Latest model runs indicate a slightly slower solution with the
main rain band intensifying over the north bay after sunrise, then
spreading south through the remainder of the bay area during the
morning. The hrrr keeps the monterey peninsula rain-free until
early afternoon. Satellite-estimated precipitable water values
still exceed 180-200% of normal offshore, with over 1.5" of pw in
the moisture plume aimed currently aimed at the northern
california coast. Thus, once this system moves through, episodes
of locally heavy rain are possible, especially over coastal hills.

Rainfall totals through Saturday morning are forecast to range
from 1-3" in the north bay and coastal hills and from 0.25-0.75"
in the lower elevations. Rain to turn to showers this afternoon
and end overnight.

In addition to rain, southerly winds are expected to ramp up in
advance of and with the front. Winds will be strongest over the
higher terrain from santa cruz county northward, as well as some
coastal areas. A wind advisory will be issued for these areas for
much of today. Downed limbs, trees and power lines seem likely.

Precip will turn showery by Friday night and end in the pre-dawn
hours of Saturday. Saturday looks dry but seasonably cool.

Another system will bring rain chances back to the area late
Sunday. This system does not look to be as wet, but an additional
0.25-0.50" with local amounts 0.75 inches possible. This rain is
expected to be east of the area by midday Monday.

Beyond that the remainder of next week now looks dry.

Aviation As of 04:40 am pdt Friday... For 12z tafs. Kmux radar
shows light to moderate rain across the district at this hour. So
far, only ksts showing MVFR, but expect CIGS to lower around
2000-2500 ft later this morning at all terminals, as more
moderate, possibly heavy at times, showers filter in from the
west/southwest.

Southeast winds will turn more southerly and southwesterly and
pick up in speed through the morning hours. Wind gusts could reach
25-30 kt at times through about 00z, as a cold front passes. Rain
will taper off north to south, transitioning to showers after the
cold front passes. Rain chances diminish by the evening hours.

Cigs should dominantly be MVFR today, with ifr possible in heavier
rain bands.

Moderate forecast confidence.

Vicinity of ksfo... MVFR ceilings and with rain by 12z-13z.

Southerly winds will increase later this morning with gusts
exceeding 20 kt around 15z and continuing into the afternoon and
early evening.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... GenerallyVFR through at least 18z. Cigs
will lower to MVFR, 2000-2500 ft, with rain. Southeast winds
turning south/southwest by 18z-20z, with gusts up to 20-25 kt
possible. Ksns should remain southeast through the day, with gusts
up to 30 kt possible through about 00z.

Marine As of 2:21 am pdt Friday... Occasional gale force gusts
are possible through the day as a storm system impacts the region
with strong southerly winds and rain. Seas will be rough with the
frontal passage, but should begin to decrease by this evening.

Expect northwest winds to return by Saturday morning before
briefly becoming southerly on Sunday as another weak system
moves over the waters.

Mtr watches/warnings/advisories
Tday Wind advisory... North bay mountains from 6 am this
morning to 3 pm pdt this afternoon
wind advisory... San francisco peninsula coast-east bay
hills and the diablo range-santa cruz mountains from
10 am this morning to 7 pm pdt this evening
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 until 9 am
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 pm
sca... Mry bay from 9 am
sca... Sf bay
public forecast: sims
aviation/marine: bam
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi42 min S 5.1 G 8.9 53°F 57°F1020.3 hPa
PXSC1 3 mi42 min 54°F 49°F
OBXC1 6 mi42 min 53°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi42 min ESE 15 G 19
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi42 min SE 11 G 18 51°F 1020.1 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi42 min SE 12 G 16 54°F 58°F1019.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi42 min SE 24 G 28 54°F 1019.9 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi42 min ESE 16 G 19 53°F 60°F1020.5 hPa
LNDC1 9 mi42 min ESE 5.1 G 8.9 53°F 1020.2 hPa
46237 - San Francisco Bar, CA (142) 11 mi42 min 56°F6 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi42 min SE 11 G 15 52°F 1019.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi42 min ESE 6 G 9.9 52°F 58°F1020.9 hPa46°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi82 min SSE 23 G 27 54°F 55°F6 ft1019.1 hPa (-3.0)
UPBC1 22 mi42 min SE 8.9 G 11
RTYC1 - 9414523 - Redwood City, CA 25 mi42 min SE 8.9 G 15 54°F 60°F1020.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi42 min E 5.1 G 7 51°F 57°F1020.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi42 min SE 25 G 30 55°F 54°F1018 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi42 min SE 8 G 8.9 54°F 1021.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi87 min SE 5.1 51°F 1021 hPa49°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi82 min SE 21 G 25 55°F 55°F6 ft1018.9 hPa (-2.7)

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi16 minSE 1310.00 miOvercast53°F46°F77%1020.1 hPa
Oakland, Metro Oakland International Airport, CA15 mi19 minSE 1110.00 miLight Rain54°F46°F77%1020.5 hPa
Hayward, Hayward Air Terminal, CA21 mi18 minSSE 910.00 miLight Rain54°F41°F62%1021.5 hPa
Half Moon Bay Airport, CA22 mi17 minSE 1310.00 miOvercast54°F48°F82%1020.3 hPa
Novato / Gnoss Field, CA23 mi37 minSE 1210.00 miOvercast52°F48°F88%1020.3 hPa
San Carlos Airport, CA23 mi17 minSSE 810.00 miOvercast52°F46°F82%1020.7 hPa
Concord, Buchanan Field, CA23 mi19 minSE 610.00 miLight Rain52°F43°F72%1019.2 hPa

Wind History from SFO (wind in knots)
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Last 24hrW10W8NW10W9W9W13
G16
W10W10W11W11W12SW11SW7SW5SE5S6SE74S8SE8SE4SE4SE6SE10
1 day agoW6W11NW9W10NW15NW14
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2 days agoSE9S6W8W9SW7S10
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SW14SW13S16S10
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S9S9--S14SE13S9SW9S4W8W12W8

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Fri -- 03:54 AM PDT     2.30 feet Low Tide
Fri -- 05:06 AM PDT     Moonrise
Fri -- 07:06 AM PDT     Sunrise
Fri -- 09:45 AM PDT     5.34 feet High Tide
Fri -- 04:01 PM PDT     Moonset
Fri -- 04:16 PM PDT     0.12 feet Low Tide
Fri -- 07:25 PM PDT     Sunset
Fri -- 11:10 PM PDT     4.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.33.732.52.32.53.13.94.65.25.34.942.81.50.60.10.30.81.72.83.84.64.9

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Fri -- 02:05 AM PDT     -1.50 knots Max Ebb
Fri -- 05:06 AM PDT     Moonrise
Fri -- 05:19 AM PDT     0.00 knots Slack
Fri -- 07:06 AM PDT     Sunrise
Fri -- 08:10 AM PDT     2.08 knots Max Flood
Fri -- 11:18 AM PDT     -0.00 knots Slack
Fri -- 02:16 PM PDT     -2.47 knots Max Ebb
Fri -- 04:01 PM PDT     Moonset
Fri -- 05:50 PM PDT     0.00 knots Slack
Fri -- 07:25 PM PDT     Sunset
Fri -- 08:56 PM PDT     2.81 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.3-1.2-1.5-1.3-1-0.30.81.72.11.91.40.4-0.8-1.9-2.4-2.3-1.8-10.21.62.52.82.51.8

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 (10,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, 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.