Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Petaluma, 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 7:53PM Saturday August 24, 2019 4:06 AM PDT (11:06 UTC) Moonrise 12:00AMMoonset 2:11PM Illumination 36% Phase: Waning Crescent; Moon at 24 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- 244 Am Pdt Sat Aug 24 2019
.small craft advisory in effect from noon pdt today through this evening...
Today..SW winds 10 to 20 kt. Gusts up to 30 kt this afternoon.
Tonight..SW winds 10 to 15 kt.
Sun..SW winds 10 to 15 kt with gusts up to 25 kt.
Sun night..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 15 to 20 kt with gusts up to 25 kt.
Wed..SW winds 15 to 20 kt with gusts up to 25 kt.
PZZ500 244 Am Pdt Sat Aug 24 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northerly winds will persist over the northern outer waters while light southwesterly winds will develop elsewhere through the weekend. Steep, short period northwesterly swells will continue to decrease through the weekend with period becoming 7 to 8 seconds. Moderate period southerly swells will increase to 2 to 3 feet on Sunday and persist through early next week with light moderate period northwesterly swell continuing through the period.


7 Day Forecast for Marine Location Near Petaluma, CA
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location: 38.22, -122.6     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 241035
afdmtr
area forecast discussion
national weather service san francisco bay area
335 am pdt Sat aug 24 2019

Synopsis High pressure will bring a fairly seasonable weather
pattern to the bay area this weekend into early next week. The
marine layer will persist along the coast along with onshore flow
keeping temperatures warm near the coast and bays. Inland
temperatures will trend hotter as the strong high pressure builds.

Remnants of tropical storm ivo will pass offshore Tuesday and
Wednesday with increasing clouds and higher humidity developing.

Discussion As of 3:35 am pdt Saturday... Fairly strong high
pressure ridge will stretch from the eastern pacific to over
california and towards arizona. Heights will rise to around 594 dm
over the bay area by this afternoon and then hold fairly steady
through about Tuesday. The fort ord profiler shows the marine
layer as deep as 2500 feet but on average it looks to be closer to
2000 feet across the region early this morning. In general the
strong ridge should start to compress the layer but low level
southerly flow continues to advect marine air locally into the bay
and valleys. Despite the strong ridge the 850 mb temps are only
around 21-22 celsius this weekend. This in combination with
onshore flow will keep things from getting too hot. In general the
ridge will allow temps to trend a few degrees above normal but
expecting mainly 70s 80s around the bay with 90s farther inland.

No big changes of note Sunday and Monday but the trend should be
for hotter temps inland as mid and upper 90s become more
widespread due to the ridge strengthening and the marine layer
compressing. Heat risk values become moderate through the period
for the interior valleys but the lack of widespread triple digit
heat should preclude the need for any headlines. Overall trend for
above normal temps but nothing too out of the ordinary for late
august.

The most interesting weather item to monitor will continue to be
the remnants of tropical storm ivo moving northward. The models
continue to be fairly consistent in their handling of this feature
as it shifts northward and interacts with the strong ridge. While
we continue to mention the increase in mid high clouds as well as
higher dewpoints as this feature passes offshore Tuesday and
Wednesday the main concern for the state will be the possibility
of thunderstorms.

The general model consensus has been to keep the main moisture and
instability well offshore, west of point conception and big sur on
Tuesday. However, the 06z GFS brings the moisture and instability
closer to shore and clips the north bay with some elevated values
of most unstable CAPE as well as modified total totals in excess
of 30. In fact the 06z GFS even generates some spotty QPF over
the north bay early weds morning. As we've been mentioning in
previous discussions the details of the storm track will remain
fluid. The conceptual model strongly suggests there will be some
type of convective activity associated with this feature as the
tropical moisture and decaying low interact with the upper ridge
and an incoming mid-latitude shortwave. However and this is to be
stressed, at this time the best chance for t-storms looks to be
north and east of the bay area (think trinity alps, mt shasta,
modoc, northern sierra). That being said cant rule out a scenario
where our CWA is impacted (and at this time the north bay would be
in the 5-10% range late Tuesday night early weds am). Due to the
nature of the system, any lightning would tend to be wet.

However, fuels are trending to their driest levels this summer and
an abundant lightning event could lead to new starts. So that
remains a very low probability scenario but worth monitoring as
impacts could be significant.

The disturbance should quickly move northward by later weds
afternoon evening followed by rebuilding high pressure and a
return of dry seasonable wx.

Aviation As of 10:52 pm pdt Friday... In most places winds have
eased since earlier today, the smx-sfo gradient has decreased to
1 mb while the onshore gradient sfo-sac is 2.8 mb. 925 mb south
winds ease tonight but resume to gusty again Saturday, 850 mb
south winds hold steady tonight and Saturday based on WRF output.

Very localized low level wind shear remains a possibility on the
coast and over the coastal waters Saturday, not enough to place in
06z tafs for now. Otherwise it'sVFR inland for the period and
ifr-MVFR coastal sections and nearby valleys tonight and Saturday
morning.

Vicinity of ksfo...VFR conditions will prevail with ifr MVFR cigs
briefly possible Saturday morning. Low confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr ceilings tonight and Saturday morning.

Vfr returning by late morning Saturday.

Marine As of 02:53 am pdt Saturday... Light northerly winds will
persist over the northern outer waters while light southwesterly
winds will develop elsewhere through the weekend. Steep, short
period northwesterly swells will continue to decrease through the
weekend with period becoming 7 to 8 seconds. Moderate period
southerly swells will increase to 2 to 3 feet on Sunday and
persist through early next week with light moderate period
northwesterly swell continuing through the period.

Mtr watches warnings advisories
Tday Sca... Sf bay from 12 pm
public forecast: rww
aviation: st
marine: st
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 21 mi49 min W 8.9 G 14 62°F 1011.1 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi49 min 67°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi56 min N 4.1 60°F 1012 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi49 min SW 8.9 G 12 62°F 1011.8 hPa
PRYC1 - 9415020 - Point Reyes, CA 25 mi55 min 56°F1011.9 hPa
UPBC1 28 mi49 min WNW 15 G 20
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi55 min W 9.9 G 17 62°F 71°F1011 hPa
FTPC1 - 9414290 - San Francisco, CA 29 mi55 min WSW 5.1 G 8.9 60°F 64°F1012 hPa
46237 - San Francisco Bar, CA (142) 30 mi37 min 61°F4 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi82 min WNW 8 61°F 1010 hPa59°F
PXSC1 31 mi49 min 62°F 61°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi49 min W 6 G 8.9 61°F 1010.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi55 min W 8 G 8.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi55 min W 19 G 23 63°F 72°F1010.6 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi49 min W 7 G 8 1011.5 hPa
OBXC1 32 mi55 min 62°F 62°F
LNDC1 34 mi49 min NNW 2.9 G 5.1 1011.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi27 min S 7.8 G 9.7 59°F 59°F1012.5 hPa
AAMC1 - 9414750 - Alameda, CA 35 mi55 min WNW 4.1 G 5.1 63°F 72°F1012 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi37 min Calm G 1.9 56°F1012.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi55 min NW 14 G 19 64°F 1009.4 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi72 minW 87.00 miOvercast59°F59°F100%1012.2 hPa
Novato / Gnoss Field, CA6 mi72 minN 010.00 miFair57°F55°F94%1011.5 hPa
Napa, Napa County Airport, CA17 mi73 minW 710.00 miFair58°F55°F93%1010.4 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi74 minSSW 310.00 miOvercast59°F55°F90%1011.2 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmS6CalmCalmCalm4N4E7E6SE7SE75
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1 day agoCalmCalmCalmCalmCalmCalmCalm4SE644
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2 days agoCalmCalmCalmCalmCalmCalm34N9SW7W9
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Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Sat -- 12:31 AM PDT     Moonrise
Sat -- 03:59 AM PDT     0.87 feet Low Tide
Sat -- 06:32 AM PDT     Sunrise
Sat -- 10:09 AM PDT     4.48 feet High Tide
Sat -- 03:10 PM PDT     Moonset
Sat -- 03:28 PM PDT     2.38 feet Low Tide
Sat -- 07:51 PM PDT     Sunset
Sat -- 08:54 PM PDT     6.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.62.51.610.91.21.82.73.54.24.54.43.93.32.82.42.53.14.15.36.36.66.45.7

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Sat -- 12:31 AM PDT     Moonrise
Sat -- 03:20 AM PDT     0.00 knots Slack
Sat -- 06:14 AM PDT     0.38 knots Max Flood
Sat -- 06:32 AM PDT     Sunrise
Sat -- 09:31 AM PDT     -0.00 knots Slack
Sat -- 11:34 AM PDT     -0.30 knots Max Ebb
Sat -- 02:08 PM PDT     0.00 knots Slack
Sat -- 03:09 PM PDT     Moonset
Sat -- 04:50 PM PDT     0.65 knots Max Flood
Sat -- 07:50 PM PDT     Sunset
Sat -- 08:17 PM PDT     -0.00 knots Slack
Sat -- 11:36 PM PDT     -0.82 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.5-0.3-0.10.20.30.40.40.30.1-0.1-0.3-0.3-0.2-00.30.60.60.50.30.1-0.3-0.6-0.8

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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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.