Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Dillon Beach, 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 6:25AMSunset 8:03PM Saturday August 17, 2019 5:42 AM PDT (12:42 UTC) Moonrise 8:34PMMoonset 7:21AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 314 Am Pdt Sat Aug 17 2019
.small craft advisory in effect until 3 pm pdt this afternoon...
Today..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. NW swell 8 to 10 ft at 10 seconds.
Tonight..W winds 15 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 6 to 8 ft at 10 seconds.
Sun..S winds 5 to 10 kt. Wind waves 1 ft. NW swell 5 to 7 ft at 10 seconds.
Sun night..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 9 seconds.
Mon..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft at 9 seconds.
Mon night..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft at 9 seconds.
Tue..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft.
Wed..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft.
PZZ500 314 Am Pdt Sat Aug 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to gusty northwesterly winds will continue over the northern and outer waters into Sunday as high pressure remains over the eastern pacific. This high pressure will begin to weaken into Sunday before a strong low pressure center develops and approaches british columbia early next week. The persistent fetch produced by these systems will generate fresh short period swell that will propagate into the california coastal waters. This short period swell in combination with gusty winds will generate hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Dillon Beach, CA
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location: 38.25, -122.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 171215
afdmtr
area forecast discussion
national weather service san francisco bay area
512 am pdt Sat aug 17 2019

Synopsis The marine layer has returned to the bay area and will
continue to usher in cooler temperatures through the weekend as
onshore breezes continue. Dry and seasonable conditions early next
week turning into a warming trend inland as high pressure builds
from the deserts through next weekend.

Discussion As of 3:08 am pdt Saturday... A solid 2000 foot
marine layer has returned to the coast with low clouds filling the
valleys of the central coast. Onshore breezes induced by a 2.5 mb
sfo to sac onshore gradient will continue to allow for more low
cloud formation through sunrise inside sf bay and up into the
north bay valleys. Upper low level pressure with a closed
circulation at 700 mb will drop to just west of the golden gate
later this afternoon. That should mean a slow burn off of the
stratus back to the coast through midday. A general cooling trend
continues, especially inland where locations that were around 100
could cool towards the low to mid 80s this afternoon. Closer to
the bay trends should be 4-8 degrees cooler with highs generally
in the 70s.

The upper trough axis stays positioned right over san francisco
tonight into Sunday. This should allow the marine layer to deepen
to at least 2500 feet and possibly deeper. Not surprisingly the
models portend a big push of stratus tonight into Sunday morning
with low clouds likely pushing out into the delta and possibly
bumping into the foothills. Given the deep marine layer, onshore
gradients and cool air aloft expect a slow burn off of stratus
inside sf bay Sunday with cool temperatures regionwide as the
inland valleys struggle to reach the low 80s.

Sunday should be the coolest day followed by a modest warming
trend early next week as high pressure slowly builds. However, the
pattern looks stagnant early next week. The main player will then
be another ridge building from the desert southwest that should
induce another warming trend by the middle of next week. Models
continue to augur some tropical activity west of baja by next
weekend that allows a broad 595 dm ridge to build over the west
coast and out into the pacific which suggests above normal temps
in the extended.

Aviation As of 5:12 am pdt Saturday... Lifr-ifr spreading
inland due to robust cooling deepening the marine layer at a
faster pace since late last evening and a southerly wind driven by
a 3.5 mb smx-sfo and 3 mb sns-sjc pressure gradients and an
onshore wind with a 2.5 mb sfo-sac pressure gradient. On the
profilers 4c of cooling has occurred near 2500 feet with the
marine layer depth approx 2000 feet and lifting, light drizzle
also wetting the ground on parts of the monterey peninsula.

Coastal stratus and fog making solid strides inland even more so
tonight per WRF model output which is having trouble keeping up
with the coverage early this morning. At least partial clearing
taking place by late this morning through mid afternoon with
diurnal warming and a steadily deepening marine layer.

The NAM forecasts the smx-sfo gradient to hold near 4 mb through
today then weakening on Sunday. There may be enough cooling at the
marine layer inversion to weaken it to the point of mixing out
completely on Sunday based on the NAM which includes cool air
advection arriving from the northwest with an elevated cold front
(at the 925 mb and 850 mb levels) approaching the coast Sunday.

Vicinity of ksfo...VFR except stratus is circling around the terminal
at a faster pace including in the approach. Low confidence sky and
wind forecast for the morning, southerly pressure gradient is
resulting in light variable wind occasionally shifting to a
southerly direction.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Lifr-ifr, patchy drizzle this morning.

Ceilings lifting to MVFR by late morning,VFR this afternoon, but
probably short lived as stratus and fog inundates the coast again
tonight. MVFR-ifr tonight and Sunday morning, patchy drizzle
likely.

Marine As of 4:41 am pdt Saturday... Moderate to gusty
northwesterly winds will continue over the northern and outer
waters into Sunday as high pressure remains over the eastern
pacific. This high pressure will begin to weaken into Sunday
before a strong low pressure center develops and approaches
british columbia early next week. The persistent fetch produced by
these systems will generate fresh short period swell that will
propagate into the california coastal waters. This short period
swell in combination with gusty winds will generate hazardous seas
conditions, particularly for smaller vessels.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 pm
sca... Sf bay from 3 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 9 am
public forecast: rww
aviation marine: canepa
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 17 mi53 min NNW 5.8 G 9.7 54°F7 ft1009.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 18 mi55 min 62°F1009.4 hPa
46214 - Point Reyes, CA (029) 33 mi43 min 54°F10 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi43 min S 12 G 14 56°F 59°F1009.8 hPa (-0.0)
46237 - San Francisco Bar, CA (142) 37 mi73 min 59°F6 ft
RCMC1 - 9414863 - Richmond, CA 38 mi55 min 67°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi55 min WSW 16 G 19 61°F 1008.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi55 min SW 16 G 22 60°F 1009.2 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi61 min SW 8.9 G 13 58°F 60°F1009.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi55 min WSW 5.1 G 8 60°F 1008.3 hPa
OBXC1 46 mi55 min 61°F 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi55 min WNW 4.1 G 5.1 61°F 1009.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi61 min WSW 4.1 G 5.1
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi61 min W 11 G 14 62°F 72°F1008.6 hPa
UPBC1 48 mi55 min W 12 G 19
LNDC1 49 mi55 min N 1.9 G 2.9 62°F 1009.2 hPa
AAMC1 - 9414750 - Alameda, CA 49 mi61 min Calm G 1.9 61°F 71°F1009.7 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, CA20 mi50 minESE 46.00 miFog/Mist55°F53°F93%1008.6 hPa
Petaluma Municipal Airport, CA20 mi48 minN 05.00 miFog/Mist54°F53°F100%1009.5 hPa
Novato / Gnoss Field, CA24 mi48 minNNW 49.00 miFair52°F50°F94%1009.1 hPa

Link to 5 minute data for KSTS

Wind History from STS (wind in knots)
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Last 24hrCalmCalmCalmS33Calm4S3S8S12S11S11S9S10S6S5S4S6SE4S4S4SE4SE4SE4
1 day agoCalmNW3CalmS3CalmSE335S6S10S11S9S6SE8S7SE7CalmCalmS3CalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmSW34SW7S8S7W9S7S4SE6S6S4S3S4CalmCalmCalmCalmCalm

Tide / Current Tables for Tomales Bay Entrance, California
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Tomales Bay Entrance
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Sat -- 12:41 AM PDT     5.03 feet High Tide
Sat -- 06:28 AM PDT     Sunrise
Sat -- 07:41 AM PDT     0.08 feet Low Tide
Sat -- 08:21 AM PDT     Moonset
Sat -- 02:07 PM PDT     4.19 feet High Tide
Sat -- 07:36 PM PDT     2.04 feet Low Tide
Sat -- 08:02 PM PDT     Sunset
Sat -- 09:34 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.954.63.82.81.70.80.20.10.51.32.33.33.94.243.632.52.12.12.433.8

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sat -- 01:40 AM PDT     -0.00 knots Slack
Sat -- 04:44 AM PDT     -1.30 knots Max Ebb
Sat -- 06:28 AM PDT     Sunrise
Sat -- 08:21 AM PDT     Moonset
Sat -- 08:35 AM PDT     0.00 knots Slack
Sat -- 11:30 AM PDT     1.03 knots Max Flood
Sat -- 02:45 PM PDT     -0.00 knots Slack
Sat -- 05:11 PM PDT     -0.87 knots Max Ebb
Sat -- 08:02 PM PDT     Sunset
Sat -- 08:36 PM PDT     0.00 knots Slack
Sat -- 09:34 PM PDT     Moonrise
Sat -- 11:24 PM PDT     0.82 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.3-0.2-0.8-1.2-1.3-1.1-0.8-0.30.20.7110.80.4-0.1-0.6-0.9-0.8-0.5-0.20.20.60.8

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.