Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Napa, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:31AMSunset 7:51PM Sunday August 25, 2019 9:48 AM PDT (16:48 UTC) Moonrise 12:14AMMoonset 3:13PM Illumination 24% Phase: Waning Crescent; Moon at 25 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 The San Francisco Bay North Of The Bay Bridge- 826 Am Pdt Sun Aug 25 2019
Today..SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt this afternoon.
Tonight..SW winds 10 to 15 kt.
Mon..SW winds 10 to 15 kt with gusts up to 25 kt.
Mon night..SW winds 10 to 15 kt.
Tue..SW winds 10 to 15 kt with gusts up to 25 kt.
Tue night..SW winds 10 to 15 kt.
Wed..SW winds 15 to 20 kt.
Thu..SW winds 15 to 20 kt.
PZZ500 826 Am Pdt Sun Aug 25 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Weakening high pressure over the eastern pacific will keep light winds over the coastal waters through early to mid next week. SEa breezes will develop in the afternoons and evenings over the san francisco bay to the delta. Southerly swell will increase to 2 to 3 feet today and persist through early next week as a tropical system west of the baja peninsula progresses northward. Additionally, light to moderate northwest swell will continue through the period.


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 251612
afdmtr
area forecast discussion
national weather service san francisco bay area
912 am pdt Sun aug 25 2019

Synopsis High pressure will produce warmer temperatures through
early next week, especially across inland areas where very warm
temperatures are forecast. The marine layer will persist along the
coast, along with light onshore flow, resulting in relatively
mild temperatures near the ocean and bays. Moisture from tropical
storm ivo may pass across our area from Tuesday afternoon into
Wednesday, bringing increasing clouds and higher humidity. Cooler
temperatures are forecast for the second half of next week.

Discussion As of 9:12 am pdt Sunday... High pressure overhead
has allowed for the marine layer to compress over the past 24
hours to about 1,000 ft deep. As of this update, 1-minute goes-
west visible imagery is showing signs of clearing in the south
bay, a trend that is expected to expand across the bay area as the
morning progresses. There was even some very patchy and locally
dense fog at the sonoma county airport outside of santa rosa where
the visibility dropped to less than 1 4 mile for about an hour.

Temperatures are forecast to warm by several degrees from
yesterday for most locations as the ridge continues to sit
overhead combined with some warming at the 850 mb level. No major
changes anticipated for the short-term; will continue to keep an
eye on temperature trends as the day continues. For additional
forecast details, please refer to the previous discussion section.

Prev discussion As of 3:12 am pdt Sunday... Overnight satellite
imagery indicates the marine layer has filled in nicely along the
coast and locally inland, especially the salinas valley. Fort ord
profiler indicates the depth is near 1,000 feet, which is a tad
more compressed compare to 24 hours. The shallower marine layer
has also led to some patchy fog this morning. Automated sensors
are bay area airports put the visibility at 2-5 miles. It's
possible that some patchy dense fog may develop between now and
sunrise.

No major change from the previous forecast. The large scale
synoptic pattern continues to be dominated by a large area of high
pressure currently over the eastern pacific extending eastward in
california. A trace of 500 mb heights over the bay area indicate a
rise in heights through at least Monday. This makes sense given
the slight compression of the marine layer and expected warm up
today and tomorrow. Given the more compressed marine layer
erosion of clouds back to the coast today will be earlier than
Saturday morning. Earlier clearing of clouds today, building 500
mb heights and warming 850 mb temperatures will all contribute to
warmer temperatures today. MAX temps today are forecast to be in
the 60s and 70s along the coast, 70s and 80s bay shoreline, and
90s to lower 100s interior. A shallow marine layer will once
again be possible Sunday night into Monday. An additional few
degrees of warming will be possible on Monday. High temperatures
will be above normal for Sunday and Monday, but heat risk
potential will be minimal thanks to some weak onshore flow and
some cooling at night.

All focus then turns toward tropical depression ivo currently
moving northward off the baja coast. Latest forecast keeps ivo
tracking northward into less than favorable conditions. Therefore,
ivo will ultimately become a remnant low later today or tonight.

Why is this important for the bay area? For several days now
models bring the leftover tropical moisture northward, which could
impact ca with thunderstorms. The real question is the exact track
of said tropical moisture. The 00z models keep the best moisture
and instability over the offshore waters before moving inland
ca or Tuesday into Wednesday. Therefore, will not mention any
convection in the forecast, but more likely higher dewpoints and
upper level clouds. There is definitely some bust potential as a
slight eastward shift would bring the possibility of
thunderstorms inland, which would be bad from a fire weather stand
point. Needless to say, this will be watched closely.

500 mb heights will lower by mid-week and into next weekend.

Therefore temperatures will cool and return to more seasonable
levels for late august.

Aviation As of 4:30 am pdt Sunday... For 12z tafs. Conditions
vary across the region this morning fromVFR at klvk to lifr at
ksts and kmry due to a mix of stratus and fog. Satellite imagery
shows stratus along the coast, over the bays, and down the salinas
valley as the marine layer sits at around 1000 ft agl per the
fort ord profiler. Ifr lifr conditions to prevail for most sites
this morning until ~16z-18z. Given a more compressed marine layer
compared to yesterday also expecting earlier clearing.VFR
conditions this afternoon and evening before patchy stratus and
potentially fog return overnight tonight. Light winds this morning
to increase and turn onshore this afternoon 10-15 kt with
occasional higher gusts possible.

Vicinity of ksfo... Satellite shows stratus filling in over the bay
and around the terminal. Ifr CIGS possible through 16z-17z.VFR
conditions this afternoon and evening. Patchy stratus to return
overnight. W to NW winds around 10 kt this morning increasing to
15 kt this afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Vlifr-ifr conditions due to low CIGS and
patchy fog through 16z-18z.VFR conditions this afternoon before
ifr CIGS potentially return early this evening. Onshore winds this
afternoon 10-15 kt.

Marine As of 8:26 am pdt Sunday... Weakening high pressure over
the eastern pacific will keep light winds over the coastal waters
through early to mid next week. Sea breezes will develop in the
afternoons and evenings over the san francisco bay to the delta.

Southerly swell will increase to 2 to 3 feet today and persist
through early next week as a tropical system west of the baja
peninsula progresses northward. Additionally, light to moderate
northwest swell will continue through the period.

Mtr watches warnings advisories
Tday None.

Public forecast: rowe mm
aviation: as
marine: sims
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 15 mi64 min W 8 71°F 1015 hPa58°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 17 mi55 min WSW 6 G 8.9 62°F 1015.8 hPa
UPBC1 20 mi55 min WNW 12 G 14
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi49 min WNW 12 G 14 64°F 72°F1015.7 hPa (+1.1)
PCOC1 - 9415144 - Port Chicago, CA 21 mi49 min W 16 G 18 64°F 71°F1015.5 hPa (+1.1)
RCMC1 - 9414863 - Richmond, CA 27 mi49 min S 1 G 4.1 62°F 67°F1016.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 28 mi49 min WNW 13 G 16 70°F 1014.2 hPa (+0.9)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi61 min S 5.1 G 6 61°F 1016.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi32 min NE 1.9 64°F 1017 hPa
OBXC1 34 mi49 min 59°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi49 min SW 2.9 G 5.1 59°F 1016.5 hPa (+1.2)
LNDC1 35 mi49 min WSW 4.1 G 5.1 61°F 1016.4 hPa (+1.2)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi49 min SW 4.1 G 5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi55 min SW 1.9 G 5.1 60°F 1015.5 hPa
PXSC1 35 mi49 min 61°F 61°F
FTPC1 - 9414290 - San Francisco, CA 36 mi49 min SW 1.9 G 5.1 58°F 63°F1016.8 hPa (+1.2)
AAMC1 - 9414750 - Alameda, CA 37 mi55 min W 1.9 G 2.9 60°F 71°F1016.9 hPa
46237 - San Francisco Bar, CA (142) 40 mi49 min 61°F3 ft
PRYC1 - 9415020 - Point Reyes, CA 42 mi49 min 61°F1016.5 hPa (+1.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 48 mi29 min WNW 1.9 G 3.9 57°F 60°F1017.2 hPa

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Napa, Napa County Airport, CA6 mi55 minSSW 510.00 miFair64°F57°F81%1015.1 hPa
Petaluma Municipal Airport, CA17 mi54 minN 010.00 miFair61°F59°F94%1016.6 hPa
Vacaville Nut Tree Airport, CA18 mi56 minSE 310.00 miFair79°F59°F50%1014.5 hPa
Novato / Gnoss Field, CA18 mi54 minN 010.00 miFair64°F57°F78%1016.3 hPa
Fairfield / Travis Air Force Base, CA19 mi1.8 hrsSW 14 G 1910.00 miFair68°F55°F66%1014.5 hPa

Link to 5 minute data for KAPC

Wind History from APC (wind in knots)
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Last 24hrW7S8S9S10S12SW13S15S17S14S10S9S10SW93SW7SW7SW3CalmCalmSW5CalmS3SW3SW5
1 day ago6SW7S12S13S16S18S14S16S17
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SW11SW9SW5CalmW3W7W7W9W5W7NW5W3
2 days agoCalmSW66S6SW9S12S13S13S10S11S6S5S4S4S3S4CalmCalmCalmCalmCalmCalmCalmSW3

Tide / Current Tables for Napa, Napa River, Carquinez Strait, California
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Napa
Click for Map
Sun -- 01:14 AM PDT     Moonrise
Sun -- 04:44 AM PDT     0.61 feet Low Tide
Sun -- 06:32 AM PDT     Sunrise
Sun -- 11:33 AM PDT     5.53 feet High Tide
Sun -- 04:12 PM PDT     Moonset
Sun -- 04:21 PM PDT     3.06 feet Low Tide
Sun -- 07:49 PM PDT     Sunset
Sun -- 09:59 PM PDT     7.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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53.72.31.30.70.61.11.9344.95.45.554.33.53.13.23.84.96.177.47.1

Tide / Current Tables for Mare Island Strait, So Vallejo, San Pablo Bay, California Current
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Mare Island Strait
Click for Map
Sun -- 01:14 AM PDT     Moonrise
Sun -- 04:44 AM PDT     0.00 knots Slack
Sun -- 06:32 AM PDT     Sunrise
Sun -- 08:40 AM PDT     1.04 knots Max Flood
Sun -- 11:24 AM PDT     -0.00 knots Slack
Sun -- 12:43 PM PDT     -0.74 knots Max Ebb
Sun -- 03:29 PM PDT     0.00 knots Slack
Sun -- 04:11 PM PDT     Moonset
Sun -- 06:54 PM PDT     1.50 knots Max Flood
Sun -- 07:48 PM PDT     Sunset
Sun -- 09:52 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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-2.2-2-1.7-1.2-0.50.10.60.9110.80.2-0.5-0.7-0.6-0.20.30.91.41.51.20.7-0.1-1.4

Weather Map and Satellite Images
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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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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.