Saturday, September23, 2017 L-36.com


Marine Weather and Tides
Napa, 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 6:57AMSunset 7:04PM Saturday September 23, 2017 3:59 AM PDT (10:59 UTC) Moonrise 9:19AMMoonset 8:24PM Illumination 8% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 301 Am Pdt Sat Sep 23 2017
Today..NW winds 10 kt...becoming W 10 to 20 kt in the afternoon.
Tonight..W winds 10 to 20 kt...decreasing to 10 kt after midnight.
Sun..NW winds 5 kt...becoming W 5 to 15 kt in the afternoon.
Sun night..W winds 5 to 15 kt.
Mon..W winds 5 to 15 kt.
Tue..NE winds 5 kt...becoming w.
Wed..NE winds 5 kt...becoming w.
PZZ500 301 Am Pdt Sat Sep 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will remain off the northern california coast while low pressure over the rockies moves east. Winds will decrease Sunday except over the northern waters.

7 Day Forecast for Marine Location Near Napa, CA
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location: 38.3, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 231035
afdmtr
area forecast discussion
national weather service san francisco bay area
335 am pdt Sat sep 23 2017

Synopsis High pressure building near the west coast will result
in dry weather, along with a warming trend, through at least the
middle of next week.

Discussion As of 3:30 am pdt Saturday... Clear skies across our
entire CWA this morning along with a squashed marine layer and a
moderate offshore flow. Temperatures are generally running a few
degrees cooler than yesterday thanks in large part to drier air
and light winds. One exception is napa where speeds are still
just enough to keep them currently at 50. Look for parts of the
north bay to drop into the upper 30s (40s will be common) with the
remainder of our CWA generally in the 40s. Low 50s will be mostly
confined to the coast.

Temperatures will quickly rebound as abundant sunshine will
combine with a synoptic pattern that will feature the longwave
trough overhead starting to progress to the east. In addition, 850
mb values will increase 1-2c by the afternoon. Highs will
generally be in the 60s at the coast with 70s to lower 80s
inland. Winds will mostly be from the north or northeast with
gusty conditions possible over parts of the north bay. That has
lead to an issuance of a red flag warning starting this afternoon
for the north bay hills. Please see the fire weather section
below for more information.

Temperatures will continue to warm each day for Sunday into
Wednesday as a ridge near the coast builds into our region and
850 mb values go up each day. The flow should remain offshore
while the marine layer will be non-existent. This will translate
into the warm weather making it down to the beaches. By Tuesday
highs will be in the 80s at most coastal spots with 80s and 90s
inland. Beyond that the range in solutions greatly increases
although the majority of the models keep very warm readings going
at least into Friday.

The big challenge for the forecast is just how warm will it get
both at the coast and inland. 850 mb temperatures and 500 mb
heights are not that impressive and anomaly values are generally 2
standard deviations or less, so did not feel comfortable going
with extremely high numbers that some of the ensemble members are
suggestion (such as 90s to the coast). The current forecast keeps
the heat threshold in the low category at the worst, however if
the forecast trends upwards that could easily move to the moderate
level. Anyone with outdoor plans or at a location without air
conditioning should keep a close eye on the forecast.

Longer range guidance favors warmer than normal conditions
continuing all of the way into the middle of october. No
precipitation is expected.

Aviation As of 10:12 pm pdt Friday for 06z Saturday
tafs... Aside sct or perhaps locally bkn clouds at sunrise tomorrow
along and near the coast,VFR conditions are expected to prevail
throughout the san francisco bay area and central california coast
over the next 24 to 30 hours. Generally light winds in the
morning will increase on Saturday afternoon. High confidence.

Vicinity of ksfo...VFR conditions expected. West winds will
develop on Saturday afternoon at around 15 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions expected, though there is
a slight possibility of bkn skies around sunrise Saturday.

Likelihood of occurrence at kmry or ksns is too low to put into
taf, but will monitor and amend if necessary. Breezy onshore winds
will decrease after sunset.

Fire weather As of 3:30 am pdt Saturday... A warming and drying
trend will start this afternoon and continue at least into at
least Tuesday morning. In addition to the warm temperatures there
will be lowering humidity values and periods of gusty northeast
winds across the north bay hills, especially across the napa
county hills and the hills of northern sonoma county. Fine fuels
will continue to dry given the lack of marine air and humidity.

Climatology also favors a greatly chance for critical fire
weather conditions for the weekend and next week.

Marine As of 3:30 am pdt Saturday... High pressure will remain
off the northern california coast while low pressure over the
rockies moves east. Winds will decrease Sunday except over the
northern waters.

Mtr watches warnings advisories
Tday Sca... Mry bay from 2 pm
sca... Pigeon pt to pt pinos 0-10 nm from 2 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 2 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: bell
aviation: rowe
marine: W pi
fire weather: bell rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 15 mi75 min NNW 2.9 51°F 1011 hPa46°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 17 mi42 min SSW 5.1 G 7 59°F 1011.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi42 min WNW 6 G 8 60°F 67°F1012.4 hPa48°F
PCOC1 - 9415144 - Port Chicago, CA 21 mi42 min SSW 7 G 9.9 57°F 67°F1012 hPa
RCMC1 - 9414863 - Richmond, CA 27 mi42 min E 1.9 G 2.9 59°F 65°F1012.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 28 mi42 min WNW 8 G 11 63°F 1011.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi42 min E 1.9 G 2.9 60°F 1012.6 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi42 min ESE 2.9 G 4.1 58°F 1012.3 hPa
OBXC1 34 mi42 min 59°F 51°F
PXSC1 35 mi42 min 61°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi42 min E 5.1 G 5.1 60°F 1011.3 hPa
LNDC1 35 mi42 min E 2.9 G 5.1 59°F 1012.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi42 min ESE 2.9 G 4.1
FTPC1 - 9414290 - San Francisco, CA 36 mi42 min SW 1.9 G 1.9 55°F 62°F1012.7 hPa
AAMC1 - 9414750 - Alameda, CA 37 mi42 min E 2.9 G 5.1 57°F 67°F1012.8 hPa
46237 - San Francisco Bar, CA (142) 40 mi60 min 59°F4 ft
PRYC1 - 9415020 - Point Reyes, CA 42 mi42 min Calm G 5.1 60°F 54°F1012.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 48 mi70 min NW 9.7 G 12 56°F 56°F5 ft1012.2 hPa (-0.4)

Wind History for Martinez-Amorco Pier, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Napa, Napa County Airport, CA6 mi66 minWNW 610.00 miFair50°F43°F77%1011.2 hPa
Petaluma Municipal Airport, CA17 mi85 minW 610.00 miFair52°F44°F77%1012.5 hPa
Novato / Gnoss Field, CA18 mi65 minNW 1310.00 miFair63°F42°F49%1012.2 hPa
Vacaville Nut Tree Airport, CA18 mi67 minNNW 810.00 miFair63°F37°F38%1011.8 hPa
Fairfield / Travis Air Force Base, CA19 mi2 hrsNNW 410.00 miFair47°F40°F76%1011.5 hPa

Wind History from APC (wind in knots)
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Last 24hrCalmCalmCalmN3CalmCalmCalmSW65SW9SW11SW11SW11SW10SW10SW4CalmCalmE4E3CalmN3NW3NW6
1 day agoW7NW5N3CalmCalmN34W45SW5S5S14
G20
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SW15SW11W6SW8S3SW3SW3W5CalmCalm
2 days agoW11W10W9W6W9W8W10W14W12W13W16W17
G23
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W19
G26
W16W13W16W13W13W15W11SW5W5W9

Tide / Current Tables for Napa, Napa River, Carquinez Strait, California
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Napa
Click for Map
Sat -- 04:36 AM PDT     6.50 feet High Tide
Sat -- 06:58 AM PDT     Sunrise
Sat -- 10:18 AM PDT     Moonrise
Sat -- 10:44 AM PDT     1.63 feet Low Tide
Sat -- 04:34 PM PDT     7.02 feet High Tide
Sat -- 07:03 PM PDT     Sunset
Sat -- 09:24 PM PDT     Moonset
Sat -- 11:22 PM PDT     0.74 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.52.84.25.56.46.45.94.93.62.51.81.72.23.44.866.976.45.33.82.41.30.8

Tide / Current Tables for Mare Island Strait, So Vallejo, San Pablo Bay, California Current
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Mare Island Strait
Click for Map
Sat -- 01:37 AM PDT     1.36 knots Max Flood
Sat -- 04:33 AM PDT     -0.00 knots Slack
Sat -- 06:36 AM PDT     -1.67 knots Max Ebb
Sat -- 06:57 AM PDT     Sunrise
Sat -- 10:07 AM PDT     0.00 knots Slack
Sat -- 10:18 AM PDT     Moonrise
Sat -- 01:16 PM PDT     1.57 knots Max Flood
Sat -- 04:27 PM PDT     -0.00 knots Slack
Sat -- 07:01 PM PDT     -1.93 knots Max Ebb
Sat -- 07:03 PM PDT     Sunset
Sat -- 09:24 PM PDT     Moonset
Sat -- 11:12 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.31.310.4-0.6-1.5-1.7-1.4-0.9-0.10.71.31.61.510.4-0.7-1.6-1.9-1.8-1.5-1-0.2

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 (6,6,7,8)
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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.