Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Danville, CA

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:59AMSunset 6:58PM Tuesday September 26, 2017 1:09 PM PDT (20:09 UTC) Moonrise 12:03PMMoonset 10:19PM Illumination 36% Phase: Waxing Crescent; Moon at 6 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- 826 Am Pdt Tue Sep 26 2017
Today..E winds 10 kt...becoming nw in the afternoon.
Tonight..N winds 5 to 15 kt.
Wed..NE winds 10 kt...becoming W in the afternoon.
Wed night..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Fri..W winds 10 kt.
Sat..W winds 5 to 15 kt.
PZZ500 826 Am Pdt Tue Sep 26 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwesterly winds will continue into this afternoon over the northern outer waters. A thermal trough over california will shift towards the coast this afternoon decreasing winds across coastal the waters. Expect winds to pick up again heading into the weekend as an upper level trough approaches the pacific northwest Friday.

7 Day Forecast for Marine Location Near Danville, CA
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location: 37.79, -122     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 261728
afdmtr
area forecast discussion
national weather service san francisco bay area
1028 am pdt Tue sep 26 2017

Synopsis Breezy in the hills this morning then turning sunny
and warm to hot again by midday. Another shot of gusty winds again
this evening for the north bay and east bay hills. Continued warm
and dry on Wednesday which may be the hottest day this week but
with winds easing. Onshore flow gradually returns by Thursday with
a few degrees of cooling followed by more noted cooling Friday
and Saturday as a trough passes to our north. Dry high pressure
rebuilds Sunday into next week.

Discussion As of 08:29 am pdt Tuesday... Modest warming trend
will continue over the region today with temperatures running a
few to as much as 7 degrees warmer (at santa rosa airport) than to
24 hours ago. With this, look for coastal locations to warm into
the upper 70s to lower 80s with mid 80s possible around santa
cruz. Inland areas and locations around the san francisco bay will
see afternoon temperatures in the upper 80s to near 90 while
inland areas warm into the mid upper 80s to lower 90s in the north
bay and east bay. Overall, the very warm temperatures will be
mostly uniform through this heat event. Have made a few minor
changes to the forecast this morning, mainly nudging up
temperatures for today and tomorrow as the MOS guidance output is
favored for most locations. Otherwise, clear skies will prevail
region-wide through at least midweek before onshore flow returns
late in the week brining slightly cooler temperatures back inland.

For additional details, please see the previous forecast
discussion below.

Prev discussion As of 3:37 am pdt Tuesday... Skies remain mostly
clear this morning with mild overnight lows around 60 most areas.

Surface gradients currently show a 6 mb pressure gradient down the
coast form arcata to sfo which is a dry northerly flow. The large
scale offshore from the deserts is around 7-8 mb which is only
moderate. This is translating to some gusty winds in the north and
east bay hills with hawkeye in northern sonoma currently gusting
28 mph with 19 mph on mt tamalpais. This all sets the stage for
rapid warming again today as the Sun comes up and the dry airmass
quickly warms up under adiabatic compression off the coastal
hills. The official forecast for today has widespread 80s and 90s
across the bay area.

Models show another shot of east northeast winds in the hills this
evening which will keep fire weather concerns in place due to poor
humidity recovery, mild temps and continued dry offshore winds.

Winds will finally ease on Wednesday but another warm to hot day
is forecast across the region.

Some coastal cooling should become obvious by Thursday as onshore
flow gradually returns to area but inland areas will remain above
normal once again.

The ECMWF nows brings a dry cold front over the bay area by
Friday. This should induce some gusty onshore winds and a possible
return of the marine layer into Saturday. The pattern looks
progressive with high pressure rebuilding by Sunday into early
next week with another thermal trough setting up at the surface.

This should translate too another round of sunny and mild days for
early next week before the next trough knocks temps back down a
few degrees.

Aviation As of 10:30 am pdt Tuesday... For 18z tafs. Another
clear day with prevailingVFR conditions expected through the
period. Generally light offshore flow expected this morning before
winds turn westerly this afternoon to around 10 kt.

Vicinity of ksfo...VFR. Generally light winds. Afternoon
westerlies 10-15 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR prevailing with clear skies through
the period.

Fire weather As of 3:37 am pdt Tuesday... Red flag warnings
remain in place for the north and east bay hills into weds.

Humidity remains below 30 percent early this morning with dry
north winds showing up in the hills. Winds forecast to ease
through the daytime hours today but another warm and dry day.

Models show another shot of gusty east northeast winds by this
evening and overnight, strongest in the napa hills. Latest fuels
analysis shows that fuels are around normal in terms of seasonable
dryness but of course this is the driest time of year. However
trend of warmer and drier will continue to dry out the fine and
live fuels. Winds will finally ease on Wednesday but that may be
the hottest and driest day this week. Will need to watch for
return of onshore winds Thursday afternoon for the interior
valleys. Breezy onshore winds Friday and Saturday then warming and
drying again Sunday into early next week.

Marine As of 08:29 am pdt Tuesday... Moderate northwesterly
winds will continue into this afternoon over the northern outer
waters. A thermal trough over california will shift towards the
coast this afternoon decreasing winds across coastal the waters.

Expect winds to pick up again heading into the weekend as an
upper level trough approaches the pacific northwest Friday.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm until 3 pm
public forecast: rgass rww
aviation: as
marine: as
fire weather: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 15 mi52 min NNW 7 G 8.9 81°F 1010.1 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi52 min WSW 6 G 8 74°F 67°F1010.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 18 mi52 min Calm G 1 80°F 1010.4 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi52 min NNW 7 G 8 70°F 1010.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 18 mi52 min E 6 G 8 78°F 67°F1010.4 hPa
OBXC1 18 mi52 min 74°F 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi52 min NNW 7 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 18 mi52 min NE 7 G 8.9 78°F 68°F1010.6 hPa47°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi52 min WNW 4.1 G 6 75°F 1009.3 hPa
PXSC1 21 mi52 min 75°F 50°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi52 min WSW 2.9 G 4.1 77°F 1010.8 hPa
RTYC1 - 9414523 - Redwood City, CA 23 mi52 min NW 7 G 9.9 78°F 68°F1009.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 23 mi52 min E 8 G 12 81°F 1009.8 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi52 min SE 1.9 G 2.9 71°F 64°F1010.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 25 mi63 min ESE 2.9 69°F 1011 hPa
FTPC1 - 9414290 - San Francisco, CA 25 mi52 min NW 1.9 G 2.9 71°F 64°F1010.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 28 mi85 min ENE 13 85°F 1010 hPa43°F
46237 - San Francisco Bar, CA (142) 34 mi70 min 61°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi80 min WNW 9.7 G 9.7 59°F 60°F4 ft1010.7 hPa (-0.5)

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA11 mi17 minVar 610.00 miFair85°F37°F19%1009.4 hPa
Hayward, Hayward Air Terminal, CA11 mi16 minWNW 1010.00 miFair85°F43°F23%1010.3 hPa
Concord, Buchanan Field, CA13 mi17 minNE 810.00 miFair85°F42°F22%1008.7 hPa
Oakland, Metro Oakland International Airport, CA13 mi17 minSW 810.00 miA Few Clouds77°F54°F45%1009.8 hPa
San Francisco, San Francisco International Airport, CA22 mi14 minN 010.00 miA Few Clouds81°F44°F27%1009.7 hPa
Palo Alto Airport, CA22 mi23 minNNW 810.00 miClear84°F46°F27%1009.8 hPa
San Carlos Airport, CA22 mi23 minNNW 710.00 miPartly Cloudy82°F42°F25%1010.2 hPa

Wind History from LVK (wind in knots)
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Last 24hrN13
G17
N6N9N10W6W6NW4CalmCalmE3CalmCalmNE3E3E3NE3CalmCalmCalmSE34Calm46
1 day agoN10NW10N8N5N8W6S3CalmCalmE3CalmNE3CalmCalmNE3E3CalmCalmCalmCalmCalmSW3W5Calm
2 days agoN10
G16
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N10W7W6E3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3CalmCalmCalmSW34W6

Tide / Current Tables for Oakland Airport, San Francisco Bay, California
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Oakland Airport
Click for Map
Tue -- 05:57 AM PDT     4.83 feet High Tide
Tue -- 07:00 AM PDT     Sunrise
Tue -- 11:02 AM PDT     2.78 feet Low Tide
Tue -- 01:03 PM PDT     Moonrise
Tue -- 04:58 PM PDT     5.87 feet High Tide
Tue -- 06:58 PM PDT     Sunset
Tue -- 11:20 PM PDT     Moonset
Tue -- 11:55 PM PDT     0.92 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.82.63.44.24.74.84.64.13.532.82.93.54.255.65.95.64.93.92.71.71.1

Tide / Current Tables for Oakland Harbor High Street Bridge, San Francisco Bay, California Current
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Oakland Harbor High Street Bridge
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Tue -- 01:52 AM PDT     1.26 knots Max Flood
Tue -- 05:28 AM PDT     -0.01 knots Slack
Tue -- 07:00 AM PDT     Sunrise
Tue -- 07:22 AM PDT     -0.77 knots Max Ebb
Tue -- 11:16 AM PDT     0.00 knots Slack
Tue -- 01:03 PM PDT     Moonrise
Tue -- 01:44 PM PDT     0.86 knots Max Flood
Tue -- 04:45 PM PDT     -0.00 knots Slack
Tue -- 06:59 PM PDT     Sunset
Tue -- 07:40 PM PDT     -1.32 knots Max Ebb
Tue -- 11:20 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.61.11.31.10.80.3-0.3-0.7-0.7-0.5-0.3-0.10.30.80.90.70.3-0.1-0.7-1.2-1.3-1.1-0.8-0.5

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (16,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, 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.