Thursday, May24, 2018 L-36.com


Marine Weather and Tides
Napa, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:49AMSunset 8:23PM Thursday May 24, 2018 6:39 PM PDT (01:39 UTC) Moonrise 2:37PMMoonset 2:23AM Illumination 77% Phase: Waxing Gibbous; Moon at 10 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- 224 Pm Pdt Thu May 24 2018
Tonight..SW winds 5 to 15 kt. Slight chance of showers after midnight.
Fri..SE winds 10 kt...becoming north in the afternoon. Chance of showers.
Fri night..W winds 10 kt. Slight chance of showers in the evening.
Sat..W winds 10 to 20 kt.
Sat night..W winds 10 to 20 kt.
Sun..SW winds 10 kt.
Memorial day..SW winds 10 kt.
Tue..SW winds 10 kt.
PZZ500 224 Pm Pdt Thu May 24 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure near the coast will keep light to moderate winds over the coastal waters. Gusty winds will be possible this evening north of the bay bridge inside the san francisco bay. Northwest winds increase Friday. Gusty winds will impact the coastal waters this holiday weekend. Mixed seas with a longer period southwest swell and a smaller northwest swell.

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 250103
afdmtr
area forecast discussion
national weather service san francisco bay area
603 pm pdt Thu may 24 2018

Synopsis Cloudy and cool today with increasing chance of
showers tonight into Friday as a late season low passes over the
region. Shower chances end by early Saturday morning. High
pressure builds Sunday through Tuesday with a noted warming and
drying trend.

Discussion As of 1:38 pm pdt Thursday... Overcast conditions
continue to dominate much of the central california coast and san
francisco bay area this early afternoon. The marine stratus
earlier today managed to push well inland to the santa clara-
merced county line at pacheco pass, and south through monterey
county up to the monterey-fresno and monterey-kings county lines.

The healthy marine layer is responding to an approaching upper
level low that will be the main weather story for our region over
the next day or two as it approaches the california coast.

Temperatures this afternoon will remain rather cool for much of
the area blanketed under the clouds. Highs will be in 50s to 60s
along the coast, and 60s to low 70s for interior locations.

Overnight tonight, the aforementioned upper level low will be
within a few hundred miles of the central california coast. As the
low moves eastward, precipitation chances will increase later
tonight and into the day on Friday. Not expecting a widespread
washout by any means, but more or less scattered shower activity.

In terms of convective thunder potential, models are suggesting
some minimal surface-based and mid-level instability with a
notable downward trend from model run-to-run. The latest day 2
storm prediction center convective outlook has actually backed off
on the general thunder area over parts of the state, which
previously had included parts of the north bay. It's still a non-
zero chance, but not looking as likely as earlier. Nonetheless,
the main impacts expected will be wet roadways from the scattered
showers that may impact the Friday commutes. With the scattered
nature of the showers, total rain amounts are expected to remain
light overall with amounts reaching a tenth of an inch or locally
a quarter of an inch for the higher elevations.

Rain chances will begin to diminish overnight Friday and into
Saturday, though can't rule out lingering showers -- particularly
in the north bay -- through midday Saturday. Temperatures will
begin rebounding back toward seasonal normals with noticeable
warming for the interior from Saturday to Sunday. Highs will
likely reach the mid 70s to 80s for the interior by Sunday with
additional warming for Monday as a ridge builds over the eastern
pacific. Can't rule out the potential for some 90s by memorial day
for the interior. Overall it should be a very nice holiday
weekend weather-wise by Sunday and Monday with some clearing even
reaching the beaches. Any beachgoers should always be mindful of
the hazards the pacific ocean presents year-round, including the
cold water temperatures and rip current risks. Always be aware of
your surroundings, and never turn your back to the ocean.

As the ridge shifts inland by Tuesday and Wednesday next week,
temperatures will likely begin a gradual cooling trend. By this
time next week models advertise a trough developing over the west
coast, which would help to reinforce a downward trend in afternoon
highs.

Aviation As of 6:00 pm pdt Thursday... Low clouds did not clear
in most areas today and will likely persist through the night now
that solar heating is diminishing. Expect widespread ceilings
near 3k feet overnight. Scattered showers associated with
approaching upper low will likely develop overnight and persist
through much of Friday. As the low moves inland on Friday, cooling
aloft should help produce sufficient mixing to clear lower
clouds. So, expect mostlyVFR conditions by late Friday morning.

Winds will be generally light except locally moderate west to
southwest winds early this evening. Forecast confidence moderate.

Vicinity of ksfo... Bkn-ovc ceilings between 2500-3000 feet
expected overnight with vcsh developing by 03z and continuing
through much of Friday. Ceilings likely to lift above 3000 feet
on Friday morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR CIGS expected into Friday morning
along with vcsh after 06z.VFR conditions forecast to develop by
midday Friday.

Marine As of 10:33 am pdt Thursday... Light to locally moderate
winds over the coastal waters today as high pressure remains off
the immediate coast. The strongest winds today will be located in
the northern san francisco bay. Northwest winds pick up by mid
day tomorrow and become locally moderate by tomorrow night
through the upcoming weekend. Mixed seas with a longer period
southwest swell and a smaller northwest swell. Increasing winds
later this weekend will bring locally steep fresh swell.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 10 pm
public forecast: rowe
aviation: dykema
marine: mm
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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 mi115 min W 16 62°F 1016 hPa52°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 17 mi52 min WSW 15 G 19 58°F 1016.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi52 min 64°F
PCOC1 - 9415144 - Port Chicago, CA 21 mi58 min WSW 16 G 22 59°F 64°F1016.3 hPa
RCMC1 - 9414863 - Richmond, CA 27 mi58 min SW 8 G 12 57°F 60°F1017.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi52 min SW 11 G 14 58°F 1017.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 28 mi64 min WNW 11 G 21 61°F 1015.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi59 min NNW 7 56°F 1018 hPa
OBXC1 34 mi52 min 57°F 50°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi52 min W 8 G 12 58°F 1017.8 hPa
PXSC1 35 mi58 min 59°F 50°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi58 min WSW 7 G 13 57°F 1016.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi58 min WSW 14 G 18
LNDC1 35 mi52 min W 8 G 13 57°F 1017.8 hPa
FTPC1 - 9414290 - San Francisco, CA 36 mi58 min SW 6 G 13 56°F 58°F1018.1 hPa
AAMC1 - 9414750 - Alameda, CA 37 mi58 min W 8 G 12 57°F 63°F1018 hPa
46237 - San Francisco Bar, CA (142) 40 mi70 min 55°F5 ft
PRYC1 - 9415020 - Point Reyes, CA 42 mi58 min W 4.1 G 8.9 53°F1017.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 48 mi50 min SW 5.8 G 7.8 55°F 54°F5 ft1018.6 hPa55°F

Wind History for Martinez-Amorco Pier, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Napa, Napa County Airport, CA6 mi46 minW 1410.00 miMostly Cloudy61°F48°F63%1015.8 hPa
Petaluma Municipal Airport, CA17 mi45 minWSW 710.00 miOvercast57°F51°F82%1017.6 hPa
Novato / Gnoss Field, CA18 mi65 minSW 10 G 1610.00 miOvercast59°F48°F68%1017.3 hPa
Vacaville Nut Tree Airport, CA18 mi47 minSW 11 G 2410.00 miFair65°F54°F68%1014.6 hPa
Fairfield / Travis Air Force Base, CA19 mi42 minWSW 24 G 3310.00 miPartly Cloudy and Windy61°F48°F64%1015.2 hPa

Wind History from APC (wind in knots)
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Last 24hrW13W12W12W10SW11SW10SW8W5W9W8W7SW8SW7SW9W7SW10SW10S13S17SW14SW15SW14W17W14
1 day agoW14W12W11W9W9W9W7W8W9W7W8W10W10W8SW9W8W7W8SW10W12W10W15W10W13
2 days agoS14S13S13
G18
S12S14S13S11SW9S11W5W4S11S9S12S12
G17
S12SW9SW10SW9S11S17S16SW15
G19
W16

Tide / Current Tables for Napa, Napa River, Carquinez Strait, California
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Napa
Click for Map
Thu -- 03:23 AM PDT     Moonset
Thu -- 05:27 AM PDT     1.23 feet Low Tide
Thu -- 05:51 AM PDT     Sunrise
Thu -- 10:48 AM PDT     5.77 feet High Tide
Thu -- 03:37 PM PDT     Moonrise
Thu -- 05:11 PM PDT     0.57 feet Low Tide
Thu -- 08:21 PM PDT     Sunset
Thu -- 11:33 PM PDT     7.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.65.54.22.81.81.31.32.13.34.55.55.85.44.43.21.910.60.81.83.14.76.17.1

Tide / Current Tables for Mare Island Strait, So Vallejo, San Pablo Bay, California Current
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Mare Island Strait
Click for Map
Thu -- 01:22 AM PDT     -1.98 knots Max Ebb
Thu -- 03:23 AM PDT     Moonset
Thu -- 04:50 AM PDT     0.00 knots Slack
Thu -- 05:51 AM PDT     Sunrise
Thu -- 08:09 AM PDT     1.22 knots Max Flood
Thu -- 10:37 AM PDT     -0.00 knots Slack
Thu -- 01:10 PM PDT     -1.93 knots Max Ebb
Thu -- 03:36 PM PDT     Moonrise
Thu -- 04:43 PM PDT     0.00 knots Slack
Thu -- 08:20 PM PDT     Sunset
Thu -- 08:42 PM PDT     1.77 knots Max Flood
Thu -- 11:41 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.2-1.9-1.9-1.5-0.70.10.71.11.21.10.5-0.5-1.5-1.9-1.8-1.4-0.70.20.91.41.71.81.40.6

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 (21,6,7,8)
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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.