Tuesday, September17, 2019 L-36.com


Marine Weather and Tides
Bolinas, CA

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
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 6:52AMSunset 7:16PM Tuesday September 17, 2019 3:19 AM PDT (10:19 UTC) Moonrise 8:27PMMoonset 9:03AM Illumination 89% Phase: Waning Gibbous; Moon at 18 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- 246 Am Pdt Tue Sep 17 2019
Today..NW winds 5 to 15 kt. NW swell 5 to 7 ft at 12 seconds and S 2 to 3 ft at 12 seconds.
Tonight..NW winds up to 10 kt. NW swell 4 to 6 ft at 11 seconds and S 2 to 3 ft at 12 seconds.
Wed..W winds 5 to 10 kt. Mixed swell nw 3 to 5 ft at 11 seconds and S 2 to 3 ft at 12 seconds. A slight chance of showers.
Wed night..NW winds 5 to 15 kt. NW swell 5 to 7 ft at 12 seconds and S around 2 ft at 13 seconds.
Thu..NW winds 5 to 15 kt. NW swell 6 to 8 ft at 12 seconds and S around 2 ft at 13 seconds.
Thu night..NW winds 5 to 15 kt. NW swell 5 to 7 ft at 12 seconds and S around 2 ft at 12 seconds.
Fri..NW winds up to 10 kt. NW swell 4 to 6 ft and S around 2 ft.
Sat..NW winds up to 10 kt. NW swell 3 to 5 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 3 to 4 ft with a dominant swell period of 13 seconds. Across the bar...seas 3 to 5 ft with a dominant swell period of 13 seconds. Maximum ebb current of 2.0 kt at 07:19 am Tuesday and 2.9 kt at 07:07 pm Tuesday.
PZZ500 246 Am Pdt Tue Sep 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light west to northwest winds will persist through late this week aside from locally breezy afternoon and evening winds along the inner coastal waters south of pigeon point and over the bays. A front will move through Tuesday night and Wednesday bringing a slight chance of showers to the northern waters Tuesday night and Wednesday morning. Northwesterly winds will increase at the end of the week. Mixed seas will continue with moderate period northwest swell and a light southerly swell.


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 171012
afdmtr
area forecast discussion
national weather service san francisco bay area
312 am pdt Tue sep 17 2019

Synopsis Dry and mild weather conditions are expected across
the region today. A weather system approaching from the northwest
may bring scattered showers to primarily the north bay late
tonight and Wednesday, and will also keep temperatures on the
cool side of normal through Thursday. Warmer weather is forecast
on Friday and Saturday, with slight cooling then expected for
Sunday.

Discussion As of 3:10 am pdt Tuesday... Drier air has made its
way into our region after the departure of yesterday's frontal
system. Skies remain mostly clear early this morning with only
patchy low clouds and a few thin high clouds drifting by. Expect
mostly sunny skies today along with mild temperatures. Highs are
forecast to be mostly in the 70s to lower 80s, except 60s along
the immediate coast.

Early morning satellite imagery shows an upper trough off the
coast of the pacific northwest, moving to the southeast. Like the
system that brought rain to our region yesterday, this one also
has a fairly decent moisture tap with precipitable water values as
high as 1.5 inches. However, this incoming system is forecast to
have more of an inland trajectory, which means less potential for
widespread rainfall across our area when the system moves through
late tonight and Wednesday. Based on a consensus of model data,
showers may begin in the north bay shortly after midnight tonight
and then spread as far south as the san francisco peninsula and
east bay on Wednesday morning. Isolated showers may linger into
Wednesday afternoon. Rainfall totals are generally forecast to be
less than a tenth of an inch, although the 06z hrrr forecasts
isolated amounts up to a half inch in the hills of the north bay.

This system will usher a cooler airmass into our region, and high
temperatures on Wednesday will mostly be in the upper 60s and
70s. Locally breezy conditions will develop near the coast and in
the hills on Wednesday afternoon as northwest winds increase.

The upper trough is forecast to move into the great basin by
Thursday morning and drier northerly flow will develop over our
area at that time. Earlier model runs indicated the potential for
gusty northerly winds in our hills late Wednesday night and
Thursday morning, but most recent models forecast only moderate
wind speeds. Temperatures will begin to warm in portions of our
area on Thursday, but still remain at or below seasonal averages.

An upper ridge is forecast to develop along the west coast by late
Friday and onshore flow will diminish and perhaps transitions to
light offshore. These developments will result in warmer weather
on Friday and Saturday with high temperatures warming into the 70s
and lower 80s near the coast, and 80s and lower 90s inland.

The models generally agree that the ridge will weaken and shift to
our east by Sunday as a trough approaches from the northwest.

Thus, Sunday will likely be at least a few degrees cooler than
Saturday, with low clouds potentially returning to coastal areas
as onshore flow redevelops.

Aviation As of 11:04 pm pdt Monday...VFR. Warm air advection
aloft later Tuesday and Tuesday night increases air mass stability
and brings in cloud layers. A period of marginal low level wind
shear develops over the north bay and east bay per recent wrf
model output 925 mb winds 06z to 14z Tuesday night and Wednesday
morning. Warm air advection light rain reaches the north bay late
Tuesday night or Wednesday morning.

Vicinity of ksfo...VFR, west wind 10 knots tonight. West wind near
15 knots with gusts to 25 knots Tuesday afternoon and evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR, light and variable winds resuming to
onshore near 10 knots by late Tuesday morning and afternoon.

Marine As of 2:46 am pdt Tuesday... Light west to northwest
winds will persist through late this week aside from locally
breezy afternoon and evening winds along the inner coastal waters
south of pigeon point and over the bays. A front will move through
Tuesday night and Wednesday bringing a slight chance of showers
to the northern waters Tuesday night and Wednesday morning.

Northwesterly winds will increase at the end of the week. Mixed
seas will continue with moderate period northwest swell and a
light southerly swell.

Mtr watches warnings advisories
Tday Sca... Mry bay from 2 pm
sca... Pigeon pt to pt pinos 0-10 nm from 2 pm
sca... Pt pinos to pt piedras blancas 0-10 nm until 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm from 2 pm
public forecast: dykema
aviation: canepa
marine: canepa
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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 mi30 min NW 3.9 G 7.8 59°F 59°F5 ft1017.2 hPa
PRYC1 - 9415020 - Point Reyes, CA 24 mi50 min 54°F1016.9 hPa
46214 - Point Reyes, CA (029) 26 mi20 min 57°F6 ft
46237 - San Francisco Bar, CA (142) 28 mi50 min 58°F4 ft
FTPC1 - 9414290 - San Francisco, CA 37 mi50 min S 2.9 G 4.1 60°F1017 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 40 mi30 min NW 7.8 G 9.7 54°F6 ft1017 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi87 min Calm 60°F 1017 hPa (+1.0)
PXSC1 41 mi50 min 63°F 54°F
RCMC1 - 9414863 - Richmond, CA 43 mi50 min WNW 5.1 G 7 65°F1016.7 hPa
OBXC1 44 mi50 min 64°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi50 min WNW 5.1 G 7 63°F 1016.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi50 min WNW 4.1 G 5.1
PPXC1 - 9414847 - Richmond (Point Potrero), CA 45 mi50 min WNW 6 G 7 64°F 1017 hPa
AAMC1 - 9414750 - Alameda, CA 46 mi50 min WNW 4.1 G 5.1 69°F1017.2 hPa
LNDC1 47 mi50 min NW 2.9 G 5.1 64°F 1016.7 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 mi84 minW 810.00 miFair63°F53°F70%1016.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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2 days agoW7W4W7W7W7W9W11NW12NW15NW17W20W19W23W20
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Tide / Current Tables for Southeast Farallon Island, California
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Southeast Farallon Island
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Tue -- 01:23 AM PDT     4.66 feet High Tide
Tue -- 06:55 AM PDT     Sunrise
Tue -- 07:25 AM PDT     1.51 feet Low Tide
Tue -- 10:02 AM PDT     Moonset
Tue -- 01:35 PM PDT     5.11 feet High Tide
Tue -- 07:16 PM PDT     Sunset
Tue -- 07:58 PM PDT     1.21 feet Low Tide
Tue -- 09:25 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.24.64.64.23.42.61.91.51.62.12.93.74.555.14.73.92.921.41.21.422.8

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Tue -- 02:50 AM PDT     -0.00 knots Slack
Tue -- 05:35 AM PDT     -0.99 knots Max Ebb
Tue -- 06:55 AM PDT     Sunrise
Tue -- 08:57 AM PDT     0.00 knots Slack
Tue -- 10:02 AM PDT     Moonset
Tue -- 11:54 AM PDT     0.84 knots Max Flood
Tue -- 02:53 PM PDT     -0.00 knots Slack
Tue -- 05:54 PM PDT     -1.12 knots Max Ebb
Tue -- 07:17 PM PDT     Sunset
Tue -- 09:25 PM PDT     Moonrise
Tue -- 09:28 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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0.90.70.4-0.1-0.6-0.9-1-0.7-0.400.40.70.80.70.4-0.1-0.5-1-1.1-0.9-0.6-0.20.20.6

Weather Map
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GEOS 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 (6,6,7,8)
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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.