Saturday, April20, 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 6:26AMSunset 7:51PM Saturday April 20, 2019 2:03 AM PDT (09:03 UTC) Moonrise 8:29PMMoonset 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- 835 Pm Pdt Fri Apr 19 2019
.small craft advisory in effect from Saturday morning through Saturday evening...
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Sat..W winds 15 to 25 kt with gusts up to 30 kt.
Sat night..W winds 5 to 15 kt.
Sun..W winds 5 to 15 kt.
Sun night..W winds 5 to 15 kt.
Mon..NW winds up to 10 kt.
Mon night..NW winds 5 to 10 kt.
Tue..NW winds up to 10 kt.
Wed..W winds up to 10 kt.
PZZ500 835 Pm Pdt Fri Apr 19 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase over the northern and central waters as and near the coast today through Saturday as low pressure develops over the interior. A moderate northwest swell will also prevail through 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 200549
afdmtr
area forecast discussion
national weather service san francisco bay area
1049 pm pdt Fri apr 19 2019

Synopsis A pair of upper lows will impact california through
the next 24 hours bringing a cooling moistening trend, a slight
chance of drizzle along the coast overnight, and increased onshore
flow through tomorrow. A renewed warming trend appears in store
for the first part of next week.

Discussion As of 9:38 pm pdt Friday... An approaching upper
level trough, deepening marine layer and increased onshore flow
resulted in cooler temperatures across the district today. High
temperatures ranged from the lower to mid 60s at the coast, to the
70s to mid 80s inland. Temperatures were generally 2-12 degrees
cooler than yesterday, but some near-coastal sites were as many as
17 degrees cooler. The onshore surface pressure gradient has
tightened to 3.4 mb between sfo and sac, up from just 0.7 mb 24
hours ago. Also, the fort ord profiler indicates that the marine
layer has ramped up to nearly 2000 feet. Although there are a lot
of high and mid-level clouds streaming over northern california,
ir satellite imagery does indicate coastal stratus has already
spread well into inland valleys even now. Updated the short term
to increase clouds overnight.

The approaching upper level trough will bring another cool day to
the area Saturday, along with possible coastal drizzle developing
later in the day and overnight. High pressure is forecast to begin
edging eastward towards california beginning on Sunday. This will
usher in a warming trend for early next week. A weaker upper
trough is progged to move across northern california later next
week for a slight cool down.

Aviation As of 10:40 pm pdt Friday... Approaching upper trough
from the northwest has increased the onshore gradient and deepened
the marine layer. Ft ord profiler shows the marine layer has
deepened steadily this evening and is now at 2000 feet. Stratus
has already spread into the sfo and mry bay area. CIGS are ifr
initially but should lift into the MVFR range later tonight as the
marine layer continues to deepen. Cannot rule out patchy drizzle
as well early Wednesday morning. Late clearing expected in the sfo
bay area Saturday while the mry bay area may not see any clearing
at all. Winds become gusty during the day Saturday with gusts up
to 25 kt.

Vicinity of ksfo... Ifr CIGS lifting to MVFR after 10z. Possible
drizzle with reduced vsbys to 5-6 miles after 12z. Clearing late
in the morning Saturday with westerly winds gradually increasing
on Saturday. Gusts to 25-28 kt Saturday afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS lifting to MVFR after 16z. Some
afternoon clearing is possible at sns but mry is expected to
remain MVFR all day Saturday.

Marine As of 10:37 pm pdt Friday... Northwest winds will
increase over the northern and central waters as and near the
coast today through Saturday as low pressure develops over the
interior. A moderate northwest swell will also prevail through
the weekend.

Mtr watches warnings advisories
Tngt 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
public forecast: sims
aviation: W pi
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 2 mi46 min WSW 12 G 17 1012.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi46 min WSW 8.9 G 15 52°F 1011.8 hPa
PXSC1 3 mi46 min 53°F 53°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi53 min SW 6 53°F 1012 hPa
OBXC1 6 mi46 min 53°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi46 min WSW 7 G 11 53°F 1013.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi46 min SW 16 G 19
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi46 min 56°F 1012.6 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi46 min SW 1.9 G 4.1 1012.1 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi46 min W 8.9 G 11 1013.6 hPa
LNDC1 9 mi46 min WSW 7 G 12 54°F 1013.1 hPa
46237 - San Francisco Bar, CA (142) 11 mi64 min 54°F7 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi46 min SW 14 G 17 55°F 1011.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi34 min NW 16 G 18 52°F 52°F1013.5 hPa
UPBC1 22 mi46 min W 5.1 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi46 min W 7 G 8.9 56°F 61°F1011.5 hPa56°F
RTYC1 - 9414523 - Redwood City, CA 25 mi46 min W 9.9 G 13 55°F 67°F1013.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi46 min SSW 9.9 G 15 55°F 61°F1011.3 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi46 min 55°F1012.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi46 min W 13 G 19 58°F 1010.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi79 min W 7 55°F 1011 hPa51°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 mi71 minW 1110.00 miOvercast55°F50°F83%1013.5 hPa
San Francisco, San Francisco International Airport, CA15 mi68 minW 118.00 miOvercast53°F50°F89%1013.1 hPa
Hayward, Hayward Air Terminal, CA21 mi70 minW 910.00 miOvercast55°F50°F83%1014.3 hPa
Half Moon Bay Airport, CA22 mi64 minNW 81.25 miLight Rain54°F51°F94%1014.2 hPa
Concord, Buchanan Field, CA23 mi71 minS 11 G 2010.00 miFair56°F48°F77%1010 hPa
San Carlos Airport, CA23 mi69 minWNW 1010.00 miPartly Cloudy55°F50°F82%1013.5 hPa
Novato / Gnoss Field, CA23 mi69 minN 010.00 miA Few Clouds54°F51°F94%1012.2 hPa

Wind History from SFO (wind in knots)
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Last 24hrW5W7W6W7W6W4NW3W7NW10NW13NW13NW16W19W16NW16W14W17W16W16SW11SW13W8W9
G17
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1 day agoW9W6W5W4CalmCalmCalmCalmNE4NE3N5NE4N5N3W12W15W13W14W14W16W13W7W12W6
2 days agoW8W7W4W7S3CalmW7W4NW9N4NE7NW9NW9NW14NW15NW14W19W18W16W18NW12W10W10W10

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
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Sat -- 12:51 AM PDT     6.20 feet High Tide
Sat -- 06:27 AM PDT     Sunrise
Sat -- 07:09 AM PDT     -0.69 feet Low Tide
Sat -- 07:33 AM PDT     Moonset
Sat -- 01:50 PM PDT     5.11 feet High Tide
Sat -- 07:08 PM PDT     1.35 feet Low Tide
Sat -- 07:49 PM PDT     Sunset
Sat -- 09:29 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.96.25.74.52.81.1-0.2-0.7-0.40.41.62.94.14.95.14.73.82.61.81.41.62.33.44.5

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Sat -- 02:09 AM PDT     -0.00 knots Slack
Sat -- 05:08 AM PDT     -3.13 knots Max Ebb
Sat -- 06:27 AM PDT     Sunrise
Sat -- 07:33 AM PDT     Moonset
Sat -- 08:33 AM PDT     0.00 knots Slack
Sat -- 11:38 AM PDT     3.49 knots Max Flood
Sat -- 03:10 PM PDT     -0.01 knots Slack
Sat -- 05:36 PM PDT     -2.11 knots Max Ebb
Sat -- 07:50 PM PDT     Sunset
Sat -- 08:40 PM PDT     0.00 knots Slack
Sat -- 09:29 PM PDT     Moonrise
Sat -- 11:35 PM PDT     2.73 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.71.70.3-1.3-2.6-3.1-2.8-2-0.80.82.43.33.42.91.80.3-1.1-2-2.1-1.5-0.70.41.72.6

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 (5,6,7,8)
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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.