Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Belvedere, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:31AMSunset 7:52PM Saturday August 24, 2019 10:05 PM PDT (05:05 UTC) Moonrise 12:00AMMoonset 2:09PM Illumination 28% Phase: Waning Crescent; Moon at 24 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- 945 Pm Pdt Sat Aug 24 2019
Tonight..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight.
Sun..SW winds 10 to 15 kt with gusts up to 25 kt.
Sun night..SW winds 10 to 15 kt.
Mon..SW winds 10 to 15 kt with gusts up to 25 kt.
Mon night..SW winds 10 to 15 kt.
Tue..SW winds 10 to 15 kt.
Tue night..SW winds 10 to 15 kt.
Wed..SW winds 10 to 15 kt.
Thu..SW winds 10 to 15 kt.
PZZ500 945 Pm Pdt Sat Aug 24 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A high pressure center over the eastern pacific will slowly weaken as it moves closer to british columbia through early to mid next week. In response the northerly pressure gradient and winds will also ease over the northern california coastal waters. SEa breezes will develop each afternoon and evening over the san francisco bay to the delta. Southerly swell will increase to 2 to 3 feet Sunday and persist through early next week with light to moderate period northwesterly swell continuing through the period.


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 250402
afdmtr
area forecast discussion
national weather service san francisco bay area
902 pm pdt Sat aug 24 2019

Synopsis High pressure will produce warmer temperatures through
early next week, especially across inland areas where very warm
temperatures are forecast. The marine layer will persist along the
coast, along with light onshore flow, resulting in relatively
mild temperatures near the ocean and bays. Moisture from tropical
storm ivo may pass across our area from Tuesday afternoon into
Wednesday, bringing increasing clouds and higher humidity. Cooler
temperatures are forecast for the second half of next week.

Discussion As of 9:00 pm pdt Saturday... Saturday was a typical
late summer day. Morning low clouds and patchy fog cleared back
to the coast by midday, leaving sunny skies for most areas during
the afternoon. High temperatures were very close to normal for
late august, ranging from the upper 60s near the ocean to the
lower 90s in the inland valleys.

An upper level ridge currently covers much of the northeast
pacific, extending from north of hawaii eastward across
california. This ridge is forecast to be our dominant weather
feature through Monday. Coastal profiler data already shows a
decrease in the depth of the marine layer since yesterday, and
model data suggest further compression of the marine layer through
Monday. Temperatures are expected to trend warmer over the next
two days, especially inland, as marine air becomes increasingly
confined to areas near the ocean. The inland valleys are forecast
to warm into the mid and upper 90s by Monday, with some of the
warmer spots such as lake berryessa and pinnacles national park
likely to climb past 100. Temperatures of this magnitude are not
all that unusual for this time of year and heat risks are
expected to climb only into the moderate category across most
inland areas through Monday. Isolated spots in the inland hills
are projected to experience high heat risk due to limited
overnight cooling. Persistent light onshore flow will keep
temperatures mild in coastal areas with highs forecast to be
mostly in the upper 60s and 70s, except for a few lower 80s
possible in locations such as santa cruz.

Tropical storm ivo off the west coast of the baja peninsula
continues to drift slowly to the north. Ivo is forecast to
dissipate well to the south of california, but some of ivo's
moisture is projected to travel well north of the dying tropical
system, thanks to southerly flow in the mid and upper levels.

Models continue to indicate that the highest moisture content in
the mid and upper levels will remain over the ocean off the coast
of california, but there are indications there could be
sufficient moisture over our area for the development of high-
based showers and or thunderstorms from about Tuesday afternoon
through early Wednesday. The question is whether there will be
sufficient mid level instability for convection to initiate over
land. On that front, the 00z NAM focuses the most unstable
conditions offshore where moisture is highest and indicates very
little chance of convection over land. Based on current models,
the most we would likely see from this tropical moisture influx
next week is mid and high level clouds and perhaps a little virga.

In any case, we will continue to monitor this situation closely
for any increasing thunderstorm potential over land. If
thunderstorms do develop, most precipitation will likely evaporate
in the dry sub-cloud layer, with the result being dry lightning
and associated wildfire concerns.

The upper ridge axis is forecast to shift to our east by late Tuesday
and this will result in cooler temperatures during the second
half of next week.

Aviation As of 4:37 pm pdt Saturday... It'sVFR all locations
except along the coastline point sur to northern coastal sonoma
county there's almost, not quite, continuous MVFR-ifr CIGS vsbys
in stratus and fog. The 4 pm onshore pressure gradient sfo-sac is
2.4 mb, other directional pressure gradients have relaxed are
closer to balanced since Friday thus the overall wind field at
the surface is lighter today with the usual summer late day sea
breezes. Increasing coverage of MVFR-ifr tonight, conditions most
places nearest the coastline are forecast to lower to ifr
overnight. Conditions then lifting toVFR back to the coastline
late morning to afternoon Sunday.

Vicinity of ksfo...VFR, west wind near 15 knots until 03z. MVFR
cig developing by 14z then back toVFR by 17z Sunday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR, west winds near 10 knots early in
the evening. Ifr CIGS returning by 03-04z. CIGS Sunday lift toVFR
by late morning.

Marine As of 4:06 pm pdt Saturday... Northerly winds will
persist over the northern outer waters while light southwesterly
winds will develop elsewhere through the weekend. Steep, short
period northwesterly swell will continue to decrease through the
weekend with periods becoming 8 seconds. Moderate period southerly
swell will increase to 2 to 3 feet on Sunday and persist through
early next week with light to moderate period northwesterly swell
continuing through the period.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm from 10 pm
public forecast: dykema
aviation: canepa
marine: sims
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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 mi53 min NNE 2.9 G 6 1014.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi47 min W 8.9 G 12 59°F 1013.6 hPa
PXSC1 3 mi47 min 61°F 61°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi36 min WSW 5.1 61°F 1015 hPa
OBXC1 6 mi53 min 61°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi47 min WNW 8 G 9.9 1014.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi53 min WNW 8 G 8.9
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi47 min SSW 8.9 G 13 61°F 1014.6 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi47 min 67°F
AAMC1 - 9414750 - Alameda, CA 8 mi53 min W 5.1 G 6 1014.9 hPa
LNDC1 9 mi53 min N 5.1 G 7 63°F 1014.4 hPa
46237 - San Francisco Bar, CA (142) 11 mi35 min 61°F4 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi47 min SW 8.9 G 12 67°F 1013.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi25 min WNW 3.9 G 7.8 59°F 60°F1015.7 hPa
UPBC1 22 mi47 min WNW 11 G 13
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi53 min W 12 G 13 74°F 72°F1013.4 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi53 min NW 7 G 8.9 65°F 76°F1014.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi53 min W 9.9 G 12 74°F 72°F1013.2 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi53 min 60°F1014.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi53 min NW 9.9 G 13 74°F 1012.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi80 min W 9.9 73°F 1013 hPa59°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 mi72 minWNW 810.00 miA Few Clouds64°F57°F81%1014.2 hPa
San Francisco, San Francisco International Airport, CA15 mi69 minWNW 1310.00 miA Few Clouds61°F57°F87%1013.9 hPa
Hayward, Hayward Air Terminal, CA21 mi71 minNW 610.00 miFair65°F57°F78%1014.8 hPa
Half Moon Bay Airport, CA22 mi70 minSSW 33.00 miFog/Mist57°F57°F100%1014.9 hPa
Concord, Buchanan Field, CA23 mi72 minW 610.00 miFair78°F50°F37%1011.5 hPa
San Carlos Airport, CA23 mi78 minNNW 310.00 miClear66°F59°F78%1013.9 hPa
Novato / Gnoss Field, CA23 mi70 minN 1110.00 miFair63°F57°F83%1013.9 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hr--------NW5--W3W4W6W6W3SW4NW3NW3NE4N6NW13NW16NW17NW16NW16NW18
G23
W17W17
1 day agoW16----W12NW8----W7W6W8--W8W3NE3N5NE5NE4NE6NE8N5N6SW154NW8
2 days ago--------W24
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W16----W8--W10W9NW8NW7NW8N6NW10NW18W22W19W21W20W20W20

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Sun -- 01:16 AM PDT     Moonrise
Sun -- 02:10 AM PDT     0.61 feet Low Tide
Sun -- 06:33 AM PDT     Sunrise
Sun -- 09:31 AM PDT     4.13 feet High Tide
Sun -- 01:47 PM PDT     3.06 feet Low Tide
Sun -- 04:11 PM PDT     Moonset
Sun -- 07:49 PM PDT     Sunset
Sun -- 07:57 PM PDT     5.98 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.60.90.60.71.21.82.53.23.84.14.13.83.53.23.13.33.84.55.25.865.74.93.8

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Sun -- 01:16 AM PDT     Moonrise
Sun -- 03:40 AM PDT     0.00 knots Slack
Sun -- 06:33 AM PDT     Sunrise
Sun -- 06:43 AM PDT     1.97 knots Max Flood
Sun -- 10:25 AM PDT     -0.01 knots Slack
Sun -- 12:22 PM PDT     -0.96 knots Max Ebb
Sun -- 03:18 PM PDT     0.00 knots Slack
Sun -- 04:11 PM PDT     Moonset
Sun -- 06:20 PM PDT     1.56 knots Max Flood
Sun -- 07:49 PM PDT     Sunset
Sun -- 09:25 PM PDT     -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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-2.2-1.8-1.2-0.50.31.31.921.71.20.4-0.5-0.9-0.9-0.5-0.10.41.11.51.510.4-0.5-1.5

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (1,6,7,8)
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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.