Thursday, April26, 2018 L-36.com


Marine Weather and Tides
Belvedere, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:17AMSunset 7:57PM Thursday April 26, 2018 6:32 AM PDT (13:32 UTC) Moonrise 3:42PMMoonset 3:48AM 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 The San Francisco Bay North Of The Bay Bridge- 301 Am Pdt Thu Apr 26 2018
Today..SW winds 5 to 15 kt...becoming W 10 to 20 kt with gusts up to 30 kt this afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri..W winds 5 to 15 kt with gusts up to 25 kt.
Fri night..W winds 10 to 20 kt with gusts up to 25 kt.
Sat..W winds 10 to 20 kt with gusts up to 25 kt.
Sat night..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..W winds 5 to 15 kt.
Mon..W winds 5 to 15 kt.
PZZ500 301 Am Pdt Thu Apr 26 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light west to northwest winds, but also locally breezy near coastal gaps and prominent points later today. Light to moderate seas will continue through the forecast period with a mixed south and northwest swell developing late in the week.

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 261145
afdmtr
area forecast discussion
national weather service san francisco bay area
445 am pdt Thu apr 26 2018

Synopsis Upper low off the coast will keep temperatures below
normal through the end of the work week and into the weekend. Some
coastal drizzle or very light showers possible later tonight
through early Saturday as the upper low moves onshore, however
most areas will remain dry with below normal temperatures being
the main impact. Cool and dry pattern continues into early next
week.

Discussion As of 3:27 am pdt Thursday... Marine layer now in
excess of 2000 feet with fog product showing another good push of
stratus into most inland valleys. Upper low well off the coast is
responsible for the deep marine layer and below normal temperature
pattern. Unseasonably cool highs today with 60s near the
coast bays and only some low to mid 70s inland. The low will
slowly approach the coast tonight into Friday. As this occurs some
coastal drizzle may occur as the marine layer continues to deepen
overnight into Friday as initial vorticity lobs passes over the
region.

Core of upper low looks to move onshore near CAPE mendocino on
Friday with continued slight chance of some coastal drizzle in
deepening marine layer environment. Light showers associated with
the instability aloft will be confined to the far north bay,
mainly later Friday night Saturday morning. Daytime highs Friday
and Saturday continue to be unseasonably cool with deep marine
layer, substantial clouds and a cool airmass aloft leading to lots
of daytime highs only in the 60s throughout the bay area.

The main low finally ejects eastward late Saturday night into
Sunday. So for the weekend Sunday looks to have more sunshine and
slightly warmer temperatures.

Longwave trough stays over the west coast with a cold but dry
shortwave dropping towards the central coast by Monday and
Tuesday. This will continue to keep temperatures on the cool side
of normal through the end of the month but no precip expected with
this upper level shortwave. Modest warming and drying trend by the
middle of next week but no hot weather nor storms of note in
sight.

Aviation As of 4:45 am pdt Thursday... Southwest flow enabling
another marine stratus intrusion this morning. Advancing low
interacting with stratus deck has resulted in higher bases
(500-800 feet higher than yesterday morning) and will likely
result in slightly earlier mix outs versus yesterday morning. In
addition, southwest flow with higher decks has allowed for a hole
in the deck to form over ksfo and most of the northern san
francisco bay. Otherwise, a few passing high clouds this morning,
stratus returns tonight, generally light onshore winds with
locally breezy gusty conditions this afternoon early evening.

Vicinity of ksfo... Southwest flow and higher bases working against
cigs at ksfo this morning, however, not uncommon to see these
types of holes in the deck fill in at or around sunrise. Watch
satellite and see what happens approach in full effect. Otherwise,
a few passing high clouds this morning, sustained winds up to
around 15k this afternoon, with an odd gust or two to around 20kt
possible. Lower CIGS potentially return late tonight into sunrise
Friday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR through mid to late morning. Some
model data suggests ovc- bkn MVFR CIGS all day but currently not
look that pessimistic given southwest to west flow unfavorable
for lingering stratus over terminals.

Marine As of 04:39 am pdt Thursday... Generally light west to
northwest winds, but also locally breezy near coastal gaps and
prominent points later today. Light to moderate seas will
continue through the forecast period with a mixed south and
northwest swell developing late in the week.

Mtr watches warnings advisories
Tday None.

Public forecast: rww
aviation: drp
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi50 min W 7 G 9.9 51°F 55°F1017.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi44 min WSW 8 G 12 51°F 1016.2 hPa
PXSC1 3 mi50 min 53°F 47°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi51 min WSW 5.1 51°F 1017 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi44 min W 5.1 G 11 52°F 1017.2 hPa
OBXC1 6 mi44 min 52°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi44 min W 12 G 15
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi44 min SW 5.1 G 8.9 53°F 1017.2 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi50 min NW 6 G 7 52°F 57°F1016.7 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi50 min W 6 G 8 52°F 63°F1017.3 hPa
LNDC1 9 mi44 min W 5.1 G 7 53°F 1017.1 hPa
46237 - San Francisco Bar, CA (142) 11 mi62 min 53°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi44 min W 8.9 G 13 53°F 1016.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi42 min WNW 5.8 G 12 51°F 54°F4 ft1017.2 hPa (-0.5)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi44 min WSW 13 G 16 61°F1016.5 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi44 min W 8.9 G 12 52°F 67°F1017.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi44 min WSW 13 G 19 51°F 62°F1016 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi44 min NW 6 G 7 54°F1016.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi44 min WNW 13 G 19 52°F 1015.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi107 min W 13 49°F 1016 hPa46°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi42 min NW 5.8 G 7.8 52°F 56°F6 ft1016.9 hPa (-0.5)

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi36 minW 710.00 miMostly Cloudy52°F43°F72%1017 hPa
Oakland, Metro Oakland International Airport, CA15 mi39 minWNW 1010.00 miMostly Cloudy51°F45°F80%1017.2 hPa
Hayward, Hayward Air Terminal, CA21 mi38 minWNW 710.00 miOvercast53°F43°F69%1017.9 hPa
Half Moon Bay Airport, CA22 mi37 minN 010.00 miOvercast50°F44°F82%1017.6 hPa
Novato / Gnoss Field, CA23 mi37 minNW 82.00 miOvercast with Haze50°F46°F88%1016.9 hPa
San Carlos Airport, CA23 mi37 minW 710.00 miOvercast52°F44°F77%1016.9 hPa
Concord, Buchanan Field, CA23 mi39 minWSW 810.00 miMostly Cloudy53°F46°F77%1015.2 hPa

Wind History from SFO (wind in knots)
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Last 24hrW6S4W5SE4NW11NW12NW13W15W16W13W15W13W13W16
G21
SW10W10W8W9W8W9W7W7W6W7
1 day agoW5W6W6NW8NW8NW10NW12W14W16W16W18W21W16NW10W10W10W8W8W8W7W6CalmSW4W7
2 days agoW6SW5CalmN5E4NE4N4NW14W17W18W18W19W18W19W14NW11W11W7NW4NW4W5W5S3SW5

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
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Thu -- 03:57 AM PDT     1.13 feet Low Tide
Thu -- 04:47 AM PDT     Moonset
Thu -- 06:19 AM PDT     Sunrise
Thu -- 10:00 AM PDT     5.01 feet High Tide
Thu -- 04:00 PM PDT     0.22 feet Low Tide
Thu -- 04:41 PM PDT     Moonrise
Thu -- 07:55 PM PDT     Sunset
Thu -- 10:48 PM PDT     5.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.53.32.21.41.11.42.1344.754.73.82.61.40.50.20.51.32.33.54.75.55.7

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Thu -- 02:11 AM PDT     -2.08 knots Max Ebb
Thu -- 04:47 AM PDT     Moonset
Thu -- 05:20 AM PDT     0.01 knots Slack
Thu -- 06:19 AM PDT     Sunrise
Thu -- 08:21 AM PDT     2.61 knots Max Flood
Thu -- 11:25 AM PDT     -0.00 knots Slack
Thu -- 02:19 PM PDT     -2.35 knots Max Ebb
Thu -- 04:41 PM PDT     Moonrise
Thu -- 05:36 PM PDT     0.01 knots Slack
Thu -- 07:55 PM PDT     Sunset
Thu -- 08:45 PM PDT     3.12 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-1.8-2.1-2-1.4-0.40.92.12.62.51.90.6-0.8-1.9-2.3-2.2-1.8-0.80.72.12.93.12.71.6

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (9,2,3,4)
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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.