Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Bolinas, CA

Version 3.4
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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 6:32AMSunset 7:52PM Saturday August 24, 2019 4:40 AM PDT (11:40 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 244 Am Pdt Sat Aug 24 2019
Today..S winds 10 to 15 kt, diminishing to 5 to 10 kt this afternoon. NW swell 3 to 5 ft at 9 seconds and sw around 2 ft at 15 seconds.
Tonight..SW winds around 5 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sun..W winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sun night..W winds 5 to 10 kt. W swell 3 to 5 ft at 12 seconds and S around 2 ft at 14 seconds.
Mon..W winds 5 to 10 kt. NW swell 3 to 5 ft at 11 seconds and S around 2 ft at 13 seconds. Patchy fog.
Mon night..W winds 5 to 10 kt. NW swell 3 to 5 ft at 11 seconds and S around 2 ft at 11 seconds. Patchy fog.
Tue..W winds 5 to 10 kt. Mixed swell nw 2 to 4 ft and S around 2 ft. Patchy fog.
Wed..SW winds 5 to 10 kt. NW swell 2 to 3 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 9 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 9 seconds. Maximum ebb current of 1.0 kt at 12:19 pm Saturday and 2.4 kt at 11:49 pm Saturday.
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 Bolinas, CA
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location: 37.67, -123.15     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
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi40 min S 5.8 G 7.8 59°F 59°F1012.6 hPa (+0.4)
PRYC1 - 9415020 - Point Reyes, CA 24 mi58 min 57°F1011.9 hPa
46214 - Point Reyes, CA (029) 26 mi40 min 57°F7 ft
46237 - San Francisco Bar, CA (142) 28 mi70 min 61°F4 ft
FTPC1 - 9414290 - San Francisco, CA 37 mi58 min WSW 5.1 G 11 60°F 64°F1012.2 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 40 mi40 min Calm G 1.9 55°F1012.2 hPa (+0.3)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi47 min Calm 60°F 1012 hPa (+0.0)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi52 min W 6 G 9.9 61°F 1010.8 hPa
PXSC1 41 mi52 min 62°F 60°F
RCMC1 - 9414863 - Richmond, CA 43 mi52 min 67°F
OBXC1 44 mi52 min 62°F 62°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi58 min WNW 7 G 9.9 62°F 1011.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi58 min W 7 G 8.9
PPXC1 - 9414847 - Richmond (Point Potrero), CA 45 mi52 min WSW 7 G 11 62°F 1012 hPa
AAMC1 - 9414750 - Alameda, CA 46 mi58 min WNW 4.1 G 5.1 63°F 72°F1012.2 hPa
LNDC1 47 mi58 min NW 4.1 G 5.1 62°F 1011.7 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA42 mi44 minW 610.00 miA Few Clouds61°F55°F84%1011.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW8W10W8W3NE3N5NE5NE4NE6NE8N5N6SW154NW8NW8NW7CalmCalmNW5W5W3W4W6
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Tide / Current Tables for Southeast Farallon Island, California
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Southeast Farallon Island
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Sat -- 12:30 AM PDT     1.07 feet Low Tide
Sat -- 12:34 AM PDT     Moonrise
Sat -- 06:35 AM PDT     Sunrise
Sat -- 07:20 AM PDT     3.56 feet High Tide
Sat -- 11:59 AM PDT     2.94 feet Low Tide
Sat -- 03:11 PM PDT     Moonset
Sat -- 06:05 PM PDT     5.43 feet High Tide
Sat -- 07:52 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.11.41.92.42.93.33.53.53.43.232.93.13.54.14.75.25.45.34.73.92.81.8

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sat -- 12:34 AM PDT     Moonrise
Sat -- 01:54 AM PDT     0.00 knots Slack
Sat -- 04:43 AM PDT     0.63 knots Max Flood
Sat -- 06:34 AM PDT     Sunrise
Sat -- 08:10 AM PDT     -0.00 knots Slack
Sat -- 10:16 AM PDT     -0.49 knots Max Ebb
Sat -- 01:18 PM PDT     0.00 knots Slack
Sat -- 03:12 PM PDT     Moonset
Sat -- 04:29 PM PDT     0.55 knots Max Flood
Sat -- 07:19 PM PDT     -0.00 knots Slack
Sat -- 07:53 PM PDT     Sunset
Sat -- 10:45 PM PDT     -1.09 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.6-0.300.40.60.60.50.40.1-0.3-0.5-0.4-0.2-0.10.10.40.50.50.40.1-0.2-0.7-1-1.1

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 (7,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, 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.