Saturday, April20, 2019 L-36.com


Marine Weather and Tides
Belmont, 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 6:25AMSunset 7:50PM Saturday April 20, 2019 9:56 AM PDT (16:56 UTC) Moonrise 8:28PMMoonset 6:34AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 836 Am Pdt Sat Apr 20 2019
.small craft advisory in effect through this evening...
Today..W winds 10 to 20 kt with gusts up to 30 kt.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..W winds 5 to 15 kt with gusts up to 25 kt.
Sun night..W winds 5 to 15 kt.
Mon..NW winds 5 to 15 kt.
Mon night..NW winds 5 to 15 kt.
Tue..NW winds up to 10 kt.
Wed..W winds up to 10 kt.
PZZ500 836 Am Pdt Sat Apr 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A cold front is sweeping through the waters from north to south this morning. Gusty northwest winds will prevail across the waters as a result today. Occasional gale force gusts are possible this late this morning through the afternoon. These gusty winds will generate steep fresh swell which is hazardous for small craft vessels. Moderate northwest swell.


7 Day Forecast for Marine Location Near Belmont, CA
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location: 37.52, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 201552
afdmtr
area forecast discussion
national weather service san francisco bay area
852 am pdt Sat apr 20 2019

Synopsis A passing cold front will bring cooler weather and
coastal drizzle to the bay area Saturday. Warmer weather is
forecast on Sunday with building high pressure. A more noticeable
warming trend will develop early next week with above normal
temperatures.

Discussion As of 08:46 am pdt Saturday... A quick moving frontal
boundary bisects the region at this hour with breezy to locally
gusty northwest winds developing in wake of its passage. The very
moist boundary layer ahead of the front resulted in widespread
drizzle with many locations reporting trace amounts to a few
hundredths of an inch near the coast and across the greater san
francisco bay area. Look for cooler temperatures, breezy winds,
and partly to mostly cloudy conditions to prevail through the
remainder of the day. With this said, the ongoing forecast remains
on track with no updates anticipated at this time. For additional
information, please see the forecast discussion below.

Prev discussion As of 03:03 am pdt Saturday... A much deeper
marine layer is currently impacting the bay area ahead of an
approaching cold front. Ft ord puts the depth near 1,800-2,000
feet this morning. Satellite imagery shows another night of
widespread coastal and inland valley stratus. Automated sensors
around the region also indicate some patchy fog with visibility
three to six miles and at times less. Additionally, half moon bay
reported a few hours of -ra and drizzle has been observed here at
the forecast office. A few other sites around the region tipped
0.01" of precip this morning too. Needless to say, but a very
moist boundary layer is present this morning. Current forecast
will continue the mention of morning clouds, fog and drizzle. As
for the cold front itself, latest surface analysis puts the front
near the far northern sonoma county. Kmux radar imagery actually
shows a few echoes off the coast, which is likely the front. Not
expecting much precip from the front, but more drizzle from the
very moist low levels. The cold front is projected to move through
the bay area today, which will result in cool and cloudy
conditions. Forecast highs today will be in the upper 50s to mid
60s at the coast and 60s to lower 70s inland or several degrees
below normal.

A few low clouds will be possible tonight with some lingering
drizzle, especially monterey big sur area, as the front exits to
the east. By Sunday high pressure will begin to build over the
region which will kick off a noticeable warming and drying trend.

Temperatures on Sunday will warm three to six degrees. High
pressure will continue to build into next week and peak
Tuesday Wednesday. Unlike the last warm up this warm up will have
some offshore flow support. Latest WRF model indicates decent ne
winds at 925mb Monday and Tuesday. Offshore flow will erode any
remaining stratus and introduce lower rh values, especially
overnight across the N and E bay hills. The strength of the ridge
is projected to be two to three standard deviations above normal
at 500 mb. Simply put, much above normal for this time of year
resulting in some rather warm temperatures. By Wednesday,
interior portions of monterey san benito could see temperatures
in the mid 90s. Other locations around the bay area will not be as
warm, but 70-80s around the bay shoreline and widespread 80s
inland. Both Tuesday and Wednesday will see high temperatures as
much as 15 degrees above normal.

Very subtle cooling on Thursday as flow aloft become more zonal
and low level flow becomes more onshore. A bigger drop in
temperatures is forecast on Friday and next weekend as an upper
level low moves toward the pacnw. Unlike previous model runs the
gfs has now backed off on precip chances next weekend and is more
inline with the ecmwf.

Aviation As of 5:03 am pdt Saturday... Ongoing onshore push of
stratus ramps up through morning per recent statistical guidance
forecasting increasing southwest to west winds by late morning and
afternoon. METAR observations range from ifr in patchy drizzle or
light rain to MVFR-vfr. Lifr probability satellite imagery shows
plenty of coastal stratus and fog converging along the coastline
and extending inland. Incoming cold front later today sweeps se
over the area with potential for strong and gusty post frontal
winds over a large part of the area this afternoon and evening.

Winds will shift to west to northwest and leaving few-sct cloud
coverage at lower levels, in generalVFR returns late today and
tonight as well as for Sunday.

Vicinity of ksfo... W-sw wind 10 to 15 knots becoming W by late
morning and increasingly strong and gusty with gusts up over 30
knots in the afternoon and evening. Ceiling lifts quickly to
MVFR-vfr by late morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Patchy drizzle or light rain in ifr
ceilings this morning, ceilings then lifting to MVFR by late
morning. Gusty winds developing in the afternoon.VFR tonight and
Sunday.

Marine As of 08:46 am pdt Saturday... A cold front is sweeping
through the waters from north to south this morning. Gusty
northwest winds will prevail across the waters as a result today.

Occasional gale force gusts are possible late this morning
through the afternoon. These gusty winds will generate steep fresh
swell which is hazardous for small craft vessels. Moderate
northwest swell.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 9 am
sca... Pigeon pt to pt piedras blancas 10-60 nm from 9 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay from 9 am
sca... Mry bay from 9 am
public forecast: rgass mm
aviation: canepa
marine: drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 4 mi57 min WNW 13 G 16 55°F 66°F1015.2 hPa (+1.3)
AAMC1 - 9414750 - Alameda, CA 17 mi57 min W 11 G 15 55°F 61°F1013.7 hPa (+0.8)
LNDC1 19 mi57 min W 7 G 12 55°F 1013.2 hPa (+0.9)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 20 mi57 min SW 9.9 G 16 55°F 1012.3 hPa (+1.3)
OBXC1 20 mi57 min 55°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 20 mi57 min W 11 G 15 55°F 1013.2 hPa (+1.3)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 20 mi57 min W 14 G 17
PXSC1 21 mi57 min 56°F 54°F
FTPC1 - 9414290 - San Francisco, CA 22 mi57 min W 8.9 G 15 54°F 58°F1013.6 hPa (+1.1)
46237 - San Francisco Bar, CA (142) 26 mi57 min 54°F7 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi58 min NNE 5.1 58°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 27 mi57 min 58°F 1013.4 hPa (+1.2)
RCMC1 - 9414863 - Richmond, CA 29 mi57 min NW 6 G 8.9 57°F 59°F1012.8 hPa (+1.2)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi47 min WNW 25 G 31 53°F 53°F1014.9 hPa
UPBC1 37 mi57 min W 14 G 21
MZXC1 - 9415102 - Martinez-Amorco CA 37 mi57 min WSW 12 G 17 56°F 60°F1012.2 hPa (+1.2)56°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi57 min W 11 G 15 56°F 1012.2 hPa (+1.4)
PCOC1 - 9415144 - Port Chicago, CA 39 mi57 min WSW 14 G 19 56°F 60°F1012.2 hPa (+1.9)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi57 min W 8.9 G 14 58°F 1011.3 hPa (+1.6)
PRYC1 - 9415020 - Point Reyes, CA 49 mi57 min 53°F1014.3 hPa (+1.8)
SFXC1 - San Francisco Bay Reserve, CA 49 mi72 min W 20 55°F 1011 hPa51°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA2 mi70 minW 118.00 miOvercast55°F50°F82%1014.9 hPa
San Francisco, San Francisco International Airport, CA8 mi61 minW 25 G 338.00 miOvercast and Windy55°F50°F83%1013.7 hPa
Palo Alto Airport, CA9 mi2.2 hrsW 710.00 miOvercast55°F51°F88%1014.2 hPa
Half Moon Bay Airport, CA12 mi62 minNW 13 G 233.00 miFog/Mist52°F50°F94%1015.2 hPa
Hayward, Hayward Air Terminal, CA13 mi63 minWSW 12 G 2110.00 miOvercast55°F51°F87%1014.9 hPa
Oakland, Metro Oakland International Airport, CA13 mi64 minW 2210.00 miOvercast and Breezy55°F51°F87%1013.5 hPa
Mountain View, Moffett Field, CA14 mi61 minN 010.00 miOvercast58°F50°F75%1015.1 hPa
San Jose, San Jose International Airport, CA21 mi64 minN 610.00 miOvercast58°F51°F78%1014.6 hPa

Wind History from SQL (wind in knots)
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Last 24hrNW7NW8N9N10W12W12--W8W14W13W9
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1 day ago355N6N5N4N4--W7--NW5N5N3CalmCalmCalmCalmCalmCalmNW4CalmCalmCalmCalm
2 days agoCalmN5N6N6N7NW7NW9N7W7W8NW7N6N3CalmCalmSE4NW3W3CalmCalmCalmCalmCalmCalm

Tide / Current Tables for Smith Slough, San Francisco Bay, California
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Smith Slough
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Sat -- 01:52 AM PDT     8.30 feet High Tide
Sat -- 06:27 AM PDT     Sunrise
Sat -- 07:33 AM PDT     Moonset
Sat -- 08:49 AM PDT     -0.69 feet Low Tide
Sat -- 02:51 PM PDT     7.21 feet High Tide
Sat -- 07:48 PM PDT     Sunset
Sat -- 08:48 PM PDT     1.35 feet Low Tide
Sat -- 09:28 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.47.88.37.86.44.52.40.7-0.4-0.70.11.73.65.56.87.26.75.542.61.61.42.13.6

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
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Sat -- 02:20 AM PDT     -0.01 knots Slack
Sat -- 05:44 AM PDT     -2.09 knots Max Ebb
Sat -- 06:27 AM PDT     Sunrise
Sat -- 07:33 AM PDT     Moonset
Sat -- 08:58 AM PDT     0.00 knots Slack
Sat -- 11:48 AM PDT     2.18 knots Max Flood
Sat -- 03:21 PM PDT     -0.01 knots Slack
Sat -- 06:12 PM PDT     -1.41 knots Max Ebb
Sat -- 07:48 PM PDT     Sunset
Sat -- 09:05 PM PDT     0.00 knots Slack
Sat -- 09:28 PM PDT     Moonrise
Sat -- 11:45 PM PDT     1.71 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.20.3-0.6-1.4-2-2.1-1.7-0.901.222.21.91.30.4-0.5-1.1-1.4-1.3-0.8-0.10.81.5

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 (12,3,4,5)
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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.