Monday, August20, 2018 L-36.com


Marine Weather and Tides
Hercules, CA

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Sunrise 6:27AMSunset 7:57PM Sunday August 19, 2018 11:58 PM PDT (06:58 UTC) Moonrise 2:15PMMoonset 12:00AM 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 Hercules, CA
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location: 38.02, -122.29     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
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 3 mi41 min SW 15 G 19 1011 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 9 mi41 min 68°F
RCMC1 - 9414863 - Richmond, CA 9 mi41 min 64°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi41 min S 14 G 17 1012.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi42 min SSW 5.1 57°F 1012 hPa
PCOC1 - 9415144 - Port Chicago, CA 14 mi47 min W 20 G 23 60°F 70°F1010.3 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi41 min SW 8 G 9.9 58°F 1012.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi47 min WSW 11 G 13
OBXC1 15 mi41 min 58°F 57°F
PXSC1 16 mi47 min 59°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 16 mi47 min ESE 1.9 G 5.1 57°F 1011.4 hPa
LNDC1 16 mi47 min W 5.1 G 6 58°F 1012.5 hPa
FTPC1 - 9414290 - San Francisco, CA 17 mi47 min SW 5.1 G 8 57°F 58°F1012.6 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi47 min W 7 G 11 58°F 69°F1012.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 19 mi74 min W 13 60°F 1010 hPa53°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 21 mi47 min NW 15 G 19 63°F 1009.2 hPa
46237 - San Francisco Bar, CA (142) 24 mi59 min 57°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi39 min W 5.8 G 9.7 57°F 57°F1012.9 hPa
RTYC1 - 9414523 - Redwood City, CA 36 mi41 min 73°F
PRYC1 - 9415020 - Point Reyes, CA 36 mi47 min W 4.1 G 7 58°F1011.8 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, CA13 mi66 minSW 118.00 miFair68°F48°F49%1009.3 hPa
Napa, Napa County Airport, CA13 mi65 minno data6.00 miFog/Mist58°F55°F90%1010.7 hPa
Novato / Gnoss Field, CA16 mi64 minN 07.00 miFair54°F51°F94%1011.5 hPa
Oakland, Metro Oakland International Airport, CA22 mi66 minN 37.00 miA Few Clouds56°F54°F93%1012.5 hPa
Petaluma Municipal Airport, CA23 mi84 minN 04.00 miFog/Mist54°F53°F100%1011.8 hPa

Wind History from APC (wind in knots)
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Last 24hrSW8S7W7
G15
W3NW4W5SW4N3W5NW4W5SW6S5SW9SW7S9S11S12S10S10S11S11S10--
1 day agoS8W3S3CalmCalmCalmCalmCalmCalmCalm3S5S7S9SW8S10S10S11S8S8S7S8S7SW7
2 days agoCalmSW4W5W7W4W5W6W4W6NW5SW53SW7S3S8SW9S12S14S11--S7SE4S3S7

Tide / Current Tables for Hercules, Refugio Landing, San Pablo Bay, California
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Hercules
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Mon -- 01:29 AM PDT     Moonset
Mon -- 04:04 AM PDT     0.67 feet Low Tide
Mon -- 06:28 AM PDT     Sunrise
Mon -- 10:35 AM PDT     4.80 feet High Tide
Mon -- 03:46 PM PDT     2.85 feet Low Tide
Mon -- 04:09 PM PDT     Moonrise
Mon -- 07:55 PM PDT     Sunset
Mon -- 09:16 PM PDT     6.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.72.51.50.90.70.91.52.43.34.24.74.84.53.93.432.93.2455.96.46.35.7

Tide / Current Tables for Davis Point, California Current
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Davis Point
Click for Map
Mon -- 01:29 AM PDT     Moonset
Mon -- 02:44 AM PDT     -2.28 knots Max Ebb
Mon -- 06:04 AM PDT     0.00 knots Slack
Mon -- 06:28 AM PDT     Sunrise
Mon -- 09:21 AM PDT     1.03 knots Max Flood
Mon -- 12:06 PM PDT     -0.00 knots Slack
Mon -- 02:52 PM PDT     -1.30 knots Max Ebb
Mon -- 04:09 PM PDT     Moonrise
Mon -- 04:59 PM PDT     0.00 knots Slack
Mon -- 07:19 PM PDT     1.40 knots Max Flood
Mon -- 07:55 PM PDT     Sunset
Mon -- 11:04 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-1.7-2.1-2.3-1.8-0.9-0.10.50.8110.60.1-0.6-1.1-1.3-0.900.91.41.310.60

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 (2,6,7,8)
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Ground Weather Radar Station Sacramento, 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.