Monday, August20, 2018 L-36.com


Marine Weather and Tides
Walnut Creek, CA

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Sunrise 6:27AMSunset 7:55PM Monday August 20, 2018 12:02 AM PDT (07:02 UTC) Moonrise 3:08PMMoonset 12:28AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 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- 857 Pm Pdt Sun Aug 19 2018
.small craft advisory in effect from Monday afternoon through Monday evening...
Tonight..SW winds 10 to 20 kt. Haze late in the evening.
Mon..SW winds 5 to 15 kt...increasing to 15 to 25 kt in the afternoon. Haze in the afternoon.
Mon night..SW winds 15 to 25 kt.
Tue..SW winds 10 to 20 kt.
Tue night..SW winds 10 to 20 kt.
Wed..SW winds 10 to 20 kt.
Thu..W winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
PZZ500 857 Pm Pdt Sun Aug 19 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A thermal trough along the california coast will maintain relatively light to moderate northwest winds across the coastal waters through midweek. Strongest winds are expected over the northern outer waters through Monday afternoon. In addition, onshore westerly winds will be breezy through the golden gate each afternoon. Light to moderate mixed northwest and southerly swell will persist through the rest of the weekend.


7 Day Forecast for Marine Location Near Walnut Creek, CA
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location: 37.9, -122.05     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 200518
afdmtr
area forecast discussion
national weather service san francisco bay area
1018 pm pdt Sun aug 19 2018

Synopsis An upper level trough will move into northern
california tonight which will bring cooler temperatures to our
entire region during the first half of the work week. A slight
rebound in temperatures is expected late in the week.

Discussion As of 09:30 pm pdt Sunday... A 581dm 500mb upper
level disturbance has dug southeastward into the pacific northwest
through the course of the day and is now centered over eugene
oregon. The broad ridge residing over the desert southwest has
yielded the northern half of california to the encroaching low
from the north which ushered in a tangible shift in the regional
weather throughout our forecast area today. Temperatures generally
reported 3 to 10 degrees cooler today versus yesterday in
response to weakening pressure and cooler air aloft. Satellite
imagery indicates that a rather dry air mass is accompanying the
base of this trough and has scoured out the marine layer from cape
mendocino southward to point reyes and will bring a less robust
marine layer for the northern counties tonight.

While the initial vorticity wave responsible for digging this
trough into northern california is progged to be ejected from the
base of the trough by midday tomorrow, the broader parent trough
will stubbornly remain in place over northern california pacnw
through midweek. A secondary vorticity wave, currently over
central british columbia, will rapidly descend southward through
the lee of the trough, reaching the base of the trough by midday
Tuesday. As this occurs, the trough will briefly intensify and
push slightly farther southward, bringing in cooler air and
weaker pressure aloft. The marine layer should also rebound and
deepen for Monday night into Tuesday morning after becoming
slightly less robust tonight. Thus, Tuesday is forecast to be the
coolest day of the upcoming week. Coastal and shoreline
communities will see temperatures in the upper 50s to 60s, with
70s for inland valleys, which is several degrees cooler than
seasonal average temperatures. Extreme inland location will see
much warmer readings in the 80s, which is near to slightly above
seasonal average temperatures. The warmest isolated, inland
locations will reach the low 90s. Locally increased onshore winds
through low lying coastal gaps is also expected as the onshore
gradient tightens.

The upper low evacuates from the broader norcal pacnw region late
Wednesday into Thursday. The desert southwest ridge will attempt
to backbuild into california late this week, however, the ridge
will be thwarted by the presence of two broad upper lows in
proximity of the golden state (a trough over the vancouver area
and a cutoff low 1000 miles west of california). As such, the san
francisco and monterey bay areas will be somewhat in the center of
3 weak features, none of which will be able to singularly
dominate the local weather pattern. This will lead to a return to
near seasonal conditions for the area, meaning a slight warming
trend (to bring us closer to normal) near the coast, with
generally light winds, and mostly clear skies sans the typical
summer morning stratus.

Aviation As of 10:18 pm pdt Sunday... Aside from coastal
lifr vlifr due to a mix of low stratus ceilings, fog, smoke and
haze spreading inland tonight and Monday morning other impacts
include reduced slant range visibilities and inland horizontal
visibilities MVFR ifr at times. Additional smoke has been
entrained in northwesterly coastal winds originating from
wildfires over far northern california and the pacific northwest
and based on the aug 19th 18z high-resolution rapid refresh model
smoke is forecast to reach the bay area by later Monday and Monday
night; along with night and morning stratus and fog, slant range
visibilities are likely to remain moderate to poor into Tuesday.

Vicinity of ksfo... It'll be hazy with a lighter westerly wind mid
evening into Monday morning. Low to moderate confidenceVFR holds
until eventually transitioning to ifr beginning 12z and lasting
to 17z Monday. Restricted slant range visibility for the period.

Sfo bridge approach... Moderate to poor slant range visibility for
the period. Otherwise similar to ksfo.

Monterey bay terminals... Ifr lifr spreading inland early-mid evening,
lifr vlifr late tonight and Monday morning. Hazy conditions likely
lingering through Monday, stratus CIGS mixing out by late Monday
morning.

Marine As of 8:57 pm pdt Sunday... A thermal trough along the
california coast will maintain relatively light to moderate
northwest winds across the coastal waters through early next week.

Strongest will are expected over the northern outer waters
through at least Monday afternoon. In addition, onshore westerly
winds will be breezy through the golden gate each afternoon. Light
to moderate mixed northwest and southerly swell will persist
through the rest of the weekend.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 4 am
public forecast: drp
aviation: canepa
marine: cw
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi33 min WNW 13 G 15 60°F 68°F1010.8 hPa59°F
PCOC1 - 9415144 - Port Chicago, CA 11 mi33 min W 20 G 23 60°F 70°F1010.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi33 min NW 15 G 20 63°F 1009.1 hPa
LNDC1 14 mi33 min W 5.1 G 8 58°F 1012.3 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi33 min WSW 5.1 G 8.9 58°F 1012.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi33 min WSW 8.9 G 12
AAMC1 - 9414750 - Alameda, CA 16 mi39 min W 7 G 11 58°F 69°F1012.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi39 min SW 13 G 17 59°F 1011.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi39 min S 13 G 17 59°F 1012.4 hPa
OBXC1 17 mi33 min 59°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi33 min Calm G 2.9 58°F 1011.3 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi39 min S 8 G 12 59°F 64°F1011.8 hPa
PXSC1 20 mi39 min 59°F 57°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi78 min W 13 60°F 1010 hPa53°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi28 min S 7 57°F 1012 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi39 min SSW 5.1 G 9.9 57°F 58°F1012.5 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi33 min NNW 4.1 G 4.1 59°F 73°F1012.7 hPa
46237 - San Francisco Bar, CA (142) 32 mi63 min 57°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi23 min WNW 5.8 G 9.7 58°F 1012.8 hPa

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA6 mi70 minSW 118.00 miFair68°F48°F49%1009.3 hPa
Oakland, Metro Oakland International Airport, CA16 mi70 minN 37.00 miA Few Clouds56°F54°F93%1012.5 hPa
Hayward, Hayward Air Terminal, CA17 mi69 minN 46.00 miOvercast with Haze59°F53°F81%1013.3 hPa
Livermore, Livermore Municipal Airport, CA18 mi70 minW 66.00 miHaze Smoke61°F51°F70%1011 hPa

Wind History from CCR (wind in knots)
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Last 24hrN4N5N3NW8N3CalmCalmCalmCalmN4NW8NW10NW10NW8NW11NW13W14NW12W7W10NW3SW7SW6SW11
1 day agoCalmNW5N3CalmCalmCalmSE3CalmCalmN63N7NW75N10NW9NW12W10W8NW8NW5NW7NW5Calm
2 days agoSW8S11S7S7CalmCalmW4SW4S5CalmN9NW8NW10NW10NW10NW11SW10W11W13SW9SW65N4N4

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
Click for Map
Mon -- 01:28 AM PDT     Moonset
Mon -- 04:53 AM PDT     0.35 feet Low Tide
Mon -- 06:28 AM PDT     Sunrise
Mon -- 11:01 AM PDT     4.05 feet High Tide
Mon -- 03:57 PM PDT     2.12 feet Low Tide
Mon -- 04:08 PM PDT     Moonrise
Mon -- 07:54 PM PDT     Sunset
Mon -- 10:16 PM PDT     5.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.82.921.20.60.40.71.32.23.13.84.13.83.32.72.32.12.32.93.74.44.95.25.1

Tide / Current Tables for Stake Point .9 Mi NNW, Suisun Bay, California Current
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Stake Point .9 Mi NNW
Click for Map
Mon -- 01:27 AM PDT     Moonset
Mon -- 04:00 AM PDT     -0.81 knots Max Ebb
Mon -- 06:27 AM PDT     Sunrise
Mon -- 07:17 AM PDT     0.00 knots Slack
Mon -- 11:00 AM PDT     0.73 knots Max Flood
Mon -- 01:32 PM PDT     -0.00 knots Slack
Mon -- 04:00 PM PDT     -0.43 knots Max Ebb
Mon -- 04:07 PM PDT     Moonrise
Mon -- 06:02 PM PDT     0.00 knots Slack
Mon -- 07:54 PM PDT     Sunset
Mon -- 09:43 PM PDT     0.80 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.3-0.6-0.7-0.8-0.7-0.4-0.10.20.50.70.70.60.2-0.1-0.3-0.4-0.3-00.30.60.80.80.7

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 (3,6,7,8)
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Ground Weather Radar Station Sacramento, 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.