Tuesday, November21, 2017 L-36.com


Marine Weather and Tides
Piedmont, 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 6:55AMSunset 4:54PM Tuesday November 21, 2017 11:32 AM PST (19:32 UTC) Moonrise 9:33AMMoonset 7:40PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 837 Am Pst Tue Nov 21 2017
Today..NE winds 5 to 15 kt.
Tonight..NE winds 10 kt.
Wed..NE winds 10 kt.
Wed night..NW winds 10 kt.
Thanksgiving day..W winds 5 to 15 kt.
Fri..N winds 10 kt.
Sat..SE winds 5 kt...becoming sw. Slight chance of rain.
PZZ500 837 Am Pst Tue Nov 21 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate winds will prevail over the coastal waters with north winds over southern waters and south winds over northern waters. Chances of rain will return to the northern waters towards the end of the week. West to northwest swell will increase mid-week.

7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211735
afdmtr
area forecast discussion
national weather service san francisco bay area
935 am pst Tue nov 21 2017

Synopsis High pressure will bring dry and warmer weather to
the area Tuesday and Wednesday. The high will move east on
Thursday with the next chance of rain late this weekend.

Discussion As of 9:00 am pst Tuesday... A 593dm 500mb high
pressure ridge centered just offshore of baja california will be
the dominant syntopic scale feature for our region over the next
few days as the ridge apex thrusts into the southern 2 3rds of
california. 850mb temperatures will increase to 17-18c, while the
daily record at 850mb is within that same range. As a result,
temperatures at the surface will also likely rise to within record
temperatures for this time of the year. As the ridge is building
from south to north, the areas most likely to be meet or beat
their records are those farther southward, primarily from the
south bay southward, including most of monterey, santa cruz, and
san benito counties. Forecast temperatures are within a degree of
records in parts of the east bay as well. Farther north, such as
in downtown san francisco, forecast temperatures are several
degrees short of records.

Tomorrow will see similar above average, near record temperatures
from the south bay southward, with a few records again at risk.

Models show the ridge weakening on thanksgiving, with around 2 to
4 degrees of cooling versus Wednesday.

Moisture riding over the top of the ridge, a "dirty" ridge
pattern, will bring some thin mid to high level cloud coverage
through the coming days, especially the farther northward you are
located. This moisture will also bring precipitation to extreme
northern california and the pacnw through the coming days. There
is a slight chance that some light precipitation will also fall
over northern napa and sonoma county as the ridge and an
approaching trough push on each other. The next best chance of
rain looks to arrive sometime during the weekend.

The current forecast looks on track, so no updates to the
overnight forecast are planned this morning. Next forecast update
will come early this afternoon.

Previous discussion As of 3:00 am pst Tuesday... The warm front
that brought rain to the north bay has lifted north as upper
level high pressure over southern california strengthens and
builds north. This will lead to a big warmup in temperatures today
through Wednesday. Highs will be in the upper 60s and 70s across
the sfo bay area with 70s to lower 80s in the southern part of the
cwa. Temperatures on Wednesday will be a couple of degrees warmer
than Tuesday and will be the warmest day of the week. We will be
under a southwesterly flow so nighttime temperatures will remain
quite mild.

The ridge will start to flatten on Thursday as an upper level
shortwave moves through the pacific northwest. Temperatures
should cool off slightly and there is a slight chance of rain
reaching far northern sonoma county on Thursday. Partly cloudy but
dry conditions are expected for Friday and Saturday as the ridge
moves a little further to the east.

A weather system will bring a chance of rain to at least the
northern part of the CWA on Sunday. This is consistent with the
gfs solution while the ECMWF is wetter and brings rain chances to
much of the cwa.

Aviation As of 09:30 am pst Tuesday... For 18z tafs. Lingering
low level moisture has led to some reduced vsby this morning
across the N bay santa clara valley and east bay. Expect
conditions to slowly improve given the amount of high level clouds
overhead. Will primarily forecastVFR for most locations with
mid-high level clouds. As usual ksts will be problematic with fog
possible tonight. Other models hint as some low CIGS tonight, but
conf is low and did not include in tafs
vicinity of ksfo... Mid and high level clouds impacting the bay.

Some haze could impact slant wise, but don't have much conf on
that actually being an impact.VFR tonight. Winds light to
moderate.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Conf is low, but some patch stratus
may be around tomorrow am.

Marine As of 09:27 am pst Tuesday... Light to moderate winds
will prevail over the coastal waters with north winds over
southern waters and south winds over northern waters. Chances of
rain will return to the northern waters towards the end of the
week. West to northwest swell will increase mid-week.

Mtr watches warnings advisories
Tday None.

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi45 min SW 4.1 G 6 60°F 1021.8 hPa
OBXC1 7 mi45 min 59°F 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi45 min SSW 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi45 min WNW 1 G 2.9 59°F 1021.9 hPa
AAMC1 - 9414750 - Alameda, CA 7 mi45 min S 5.1 G 5.1 59°F 58°F1022.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi45 min NNE 4.1 G 8 66°F 1022.1 hPa
PXSC1 10 mi45 min 59°F 55°F
RCMC1 - 9414863 - Richmond, CA 11 mi51 min NE 8.9 G 12 63°F 58°F1021.8 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi51 min NE 8.9 G 9.9 59°F 58°F1022.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi45 min E 7 G 9.9 60°F 58°F1023 hPa56°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi45 min E 9.9 G 13 59°F 1022.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 17 mi45 min ENE 9.9 G 13 58°F 58°F1022.6 hPa
46237 - San Francisco Bar, CA (142) 22 mi63 min 57°F3 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi45 min ESE 7 G 8.9 57°F 1022.9 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi45 min E 2.9 G 5.1 62°F 59°F1022.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi108 min E 11 60°F 1022 hPa52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi43 min E 16 G 18 59°F 57°F4 ft1020.5 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 41 mi45 min S 2.9 G 4.1 56°F1020.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi43 min ENE 3.9 G 5.8 61°F 59°F5 ft1019.8 hPa (+0.0)

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi40 minSSW 610.00 miMostly Cloudy60°F55°F84%1021.9 hPa
Concord, Buchanan Field, CA13 mi40 minENE 710.00 miFair63°F52°F68%1021.4 hPa
Hayward, Hayward Air Terminal, CA14 mi39 minSSW 48.00 miFair64°F50°F60%1022.6 hPa
San Francisco, San Francisco International Airport, CA18 mi37 minENE 59.00 miMostly Cloudy61°F53°F75%1021.5 hPa
San Carlos Airport, CA22 mi43 minVar 310.00 miMostly Cloudy63°F53°F73%1021.7 hPa
Livermore, Livermore Municipal Airport, CA24 mi40 minENE 1110.00 miFair64°F52°F65%1021.7 hPa

Wind History from OAK (wind in knots)
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Last 24hrCalmW3N5CalmCalmW5CalmNW3NW4N4NW7NW5CalmCalmE9E9E7E9E8E8E6E7SE5SW6
1 day agoW4W7W7W6NW6NW4W4NW5CalmCalmCalmSE3E4CalmCalmNE3S3CalmNE3CalmE3SE5S3SE3
2 days agoW8W8W10NW11NW9NW5NW4CalmE3NE3NE3E3NE4NE4NE3CalmNE4CalmNE3CalmCalmE3S3SW4

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Berkeley
Click for Map
Tue -- 02:16 AM PST     4.68 feet High Tide
Tue -- 06:56 AM PST     Sunrise
Tue -- 07:09 AM PST     2.98 feet Low Tide
Tue -- 09:32 AM PST     Moonrise
Tue -- 12:45 PM PST     5.65 feet High Tide
Tue -- 04:53 PM PST     Sunset
Tue -- 07:40 PM PST     Moonset
Tue -- 07:49 PM PST     -0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.64.34.74.64.23.63.233.13.64.355.55.65.34.43.21.80.7-0.1-0.20.10.91.9

Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Tue -- 02:07 AM PST     -0.01 knots Slack
Tue -- 04:08 AM PST     -0.62 knots Max Ebb
Tue -- 06:56 AM PST     Sunrise
Tue -- 07:23 AM PST     0.00 knots Slack
Tue -- 09:32 AM PST     Moonrise
Tue -- 10:20 AM PST     0.61 knots Max Flood
Tue -- 12:57 PM PST     -0.00 knots Slack
Tue -- 04:15 PM PST     -1.26 knots Max Ebb
Tue -- 04:53 PM PST     Sunset
Tue -- 07:40 PM PST     Moonset
Tue -- 08:09 PM PST     0.00 knots Slack
Tue -- 11:25 PM PST     0.94 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.50.1-0.4-0.6-0.5-0.3-0.10.20.40.60.60.3-0-0.5-1-1.2-1.2-0.9-0.5-0.10.40.70.9

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 (14,3,4,5)
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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.