Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Roseland, CA

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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 7:54PM Saturday August 24, 2019 5:17 AM PDT (12:17 UTC) Moonrise 12:00AMMoonset 2:12PM Illumination 35% 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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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 244 Am Pdt Sat Aug 24 2019
Today..S winds 5 to 10 kt. NW swell 4 to 6 ft at 9 seconds and sw around 2 ft at 15 seconds.
Tonight..W winds around 5 kt. Wind waves 3 to 4 ft. W swell 2 to 3 ft at 12 seconds and sw around 2 ft at 15 seconds. Patchy fog.
Sun..SW winds around 5 kt. Wind waves 2 to 3 ft. NW swell 3 to 5 ft at 12 seconds and S around 2 ft at 15 seconds.
Sun night..W winds 5 to 10 kt. NW swell 4 to 6 ft at 12 seconds and S around 2 ft at 13 seconds.
Mon..S winds around 5 kt. NW swell 5 to 7 ft at 11 seconds and S around 2 ft at 12 seconds. Patchy fog.
Mon night..W winds around 5 kt. NW swell 5 to 7 ft at 11 seconds and S around 2 ft at 11 seconds. Patchy fog.
Tue..SW winds 5 to 10 kt. NW swell 3 to 5 ft and S around 2 ft. Patchy fog.
Wed..SW winds 5 to 10 kt. NW swell 2 to 3 ft. Patchy fog.
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 Roseland, CA
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location: 38.43, -122.71     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 241158
afdmtr
area forecast discussion
national weather service san francisco bay area
458 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 04:58 am pdt Saturday... Depth of the marine
layer varies around 1500-2500 feet across the area this morning.

Southerly gradient has held steady at around 1 mb with light
southerly winds in the valleys such as at ksjc and ksns. CIGS are
higher than previous mornings with ifr to MVFR along the coast and
sf bay as well as the north bay valleys whileVFR continues
inland. Stratus should begin to retreat to the coast after sunrise
withVFR developing at all TAF sites by late morning. Winds this
afternoon turning onshore and increasing to 10-15 kt. Stratus will
likely impact similar locations tonight with lower CIGS as high
pressure compresses the marine layer.

Vicinity of ksfo... Stratus rapidly filling in near the terminal
and approach with MVFR CIGS at times through 16-17z. Stratus may
be patchy through the morning especially if any light
southwesterly winds mix down to the surface.VFR this afternoon
with winds increasing to near 15kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS this morning withVFR developing
around 17-18z. Ifr CIGS returning early to mid evening tonight.

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
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 33 mi48 min 57°F1012.1 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 34 mi28 min Calm G 1.9 55°F5 ft1012.2 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi48 min WSW 8.9 G 14 62°F 1011.5 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi48 min 67°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi37 min N 4.1 60°F 1012 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi93 min WNW 12 60°F 1010 hPa58°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 41 mi48 min SW 6 G 8.9 62°F 1012.3 hPa
UPBC1 41 mi48 min WNW 16 G 20
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi48 min W 16 G 18 62°F 71°F1011.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi48 min WSW 16 G 21 63°F 72°F1011.1 hPa
FTPC1 - 9414290 - San Francisco, CA 45 mi54 min WSW 6 G 9.9 60°F 64°F1012.3 hPa
46237 - San Francisco Bar, CA (142) 45 mi48 min 61°F4 ft
PXSC1 46 mi48 min 62°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi48 min WNW 9.9 G 12 61°F 1011.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 47 mi28 min S 5.8 G 7.8 59°F 59°F5 ft1012.7 hPa
OBXC1 47 mi48 min 61°F 61°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 47 mi48 min W 5.1 G 9.9 60°F 1011 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 48 mi48 min W 9.9 G 12
LNDC1 49 mi48 min WNW 5.1 G 7 62°F 1011.9 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA8 mi25 minW 310.00 miOvercast59°F55°F90%1011.7 hPa
Petaluma Municipal Airport, CA13 mi23 minNW 36.00 miFog/Mist59°F59°F100%1012.5 hPa
Novato / Gnoss Field, CA21 mi23 minN 010.00 miMostly Cloudy57°F55°F94%1012.2 hPa

Link to 5 minute data for KSTS

Wind History from STS (wind in knots)
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Last 24hrCalmNW3CalmCalmCalm44S8SW9SW9SW12
G20
S9SW7S8S6S6S6SE4S5S4CalmS3W3W3
1 day agoS4CalmCalm34--Calm4SW7S9S10S8S9S8SE9S6SE6S3S3CalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmS4SW445SW7NW12
G17
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G22
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NW13N12NW11
G21
NW11NW9NW9S3S3S3S3

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
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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 Lakeville, Petaluma River, San Pablo Bay, California
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Lakeville
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Sat -- 12:31 AM PDT     Moonrise
Sat -- 03:39 AM PDT     0.87 feet Low Tide
Sat -- 06:32 AM PDT     Sunrise
Sat -- 09:58 AM PDT     4.28 feet High Tide
Sat -- 03:08 PM PDT     2.38 feet Low Tide
Sat -- 03:10 PM PDT     Moonset
Sat -- 07:51 PM PDT     Sunset
Sat -- 08:43 PM PDT     6.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.12.11.40.90.91.322.83.64.14.34.13.73.12.62.42.63.34.35.46.26.365.3

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (8,2,3,4)
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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.