Sunday, April22, 2018 L-36.com


Marine Weather and Tides
Dillon Beach, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:22AMSunset 7:55PM Sunday April 22, 2018 2:31 PM PDT (21:31 UTC) Moonrise 11:20AMMoonset 1:03AM Illumination 50% Phase: First Quarter Moon; Moon at 7 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 Point Arena To Point Reyes To 10 Nm- 213 Pm Pdt Sun Apr 22 2018
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 7 to 8 ft at 13 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 6 to 8 ft at 13 seconds.
Mon night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 6 ft at 12 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 5 to 7 ft at 18 seconds.
Tue night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 6 to 8 ft at 16 seconds.
Wed..SW winds 5 to 15 kt. Wind waves 1 to 3 ft.. W swell 5 to 7 ft.
Thu..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 4 to 6 ft. SWell S 3 ft.
Fri..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 4 to 6 ft and S 3 ft. Slight chance of rain.
PZZ500 213 Pm Pdt Sun Apr 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwesterly winds will continue through this evening across the coastal waters as high pressure resides over the eastern pacific and a trough sits over the california coast. Brisk winds will continue to produce steep wind waves and fresh swell resulting in choppy seas through this evening. Winds will diminish tonight into tomorrow.

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 222105
afdmtr
area forecast discussion
national weather service san francisco bay area
205 pm pdt Sun apr 22 2018

Synopsis Dry and seasonable weather for much of the upcoming
work week. An upper low may approach by Thursday or Friday with a
slight chance of showers, mainly for the north bay but most likely
scenario is all locations stay dry with a modest cooling trend by
late in the week into next weekend.

Discussion As of 2:05 pm pdt Sunday... Skies are mostly sunny
this Sunday afternoon with just some thin high clouds over the
region. Temperatures range from around 60 at the beaches, 60s
around the bay and mid 70s inland with lower 80s showing up
around stockton. Current dewpoint readings in the mid 50s along
with a strong northerly gradient of nearly 6 mb. This should keep
skies mostly clear with overnight lows from the mid 40s to lower
50s most locations.

Synoptic pattern doesnt change too much through midweek so that
should give us afternoon highs generally in the 70s inland with
60s near the coast. No extreme heat, precip or cold weather under
this pattern.

Next feature we'll be tracking is a cut-off type low coming in
from the west. At the very least onshore flow will increase by
midweek into Thursday with airmass cooling aloft. This should lead
to subtle cooling by Thursday and Friday.

General model trend has been to bring the upper low onshore north
of the golden gate later Friday into Saturday. Right now precip
chances look slight meager at best. However, decided to just keep
the slight chances in the forecast as we'll likely see forecast
simulations oscillate over the next few days. Either way there
does remain a slight chance of showers late in the week. Upper low
should eject inland by next Saturday or Sunday with dry and warm
weather on the backside of that. Spring appears to be here with
dry weather, cut-off lows and no storms of note in sight.

Prev discussion As of 3:00 am pdt Sunday... Early morning satellite
imagery indicates patchy low clouds have developed in coastal
areas overnight. Expect low clouds and fog to become somewhat
more widespread along the coast and into the salinas valley by
daybreak. Low clouds are expected to clear by late morning,
leaving mostly sunny skies for the balance of the day. A shortwave
trough currently moving into the pacific northwest and far
northern california is not expected to have a significant impact
on our weather today. However, the shortwave will weaken the
ridge over california and likely result in slightly cooler
temperatures today compared to Saturday. In any case, temperatures
today are expected to be 5 to 10 degrees warmer than normal.

By Monday, the upper ridge is forecast to rebuild over california
and offshore flow at 925 mb is expected to develop and bring
drier air into the boundary layer. These developments indicate the
potential for at least slight warming on Monday.

An upper trough currently in the gulf of alaska is forecast to dig
south over the next few days and form a cutoff low west of
california along 135w by Tuesday. The models agree that this low
will then move very slowly eastward towards the california coast
through the remainder of the week. The result will be a cooling
trend starting on Tuesday, with temperatures expected to cool
back down to near normal, or slightly below normal, by midweek.

The models agree that precipitation associated with the upper low
will remain offshore through at least Friday. But the models
diverge by next weekend. The ECMWF forecasts the low to track
inland near the ca or border on Saturday and then continue to move
steadily to the ene. Under the ECMWF solution, only the far
northern portion of our forecast area would have any potential for
rain. Initially, the GFS also tracks the low towards the ca or
border, but then forecasts the low to change direction and drop
southeast and into central california. The GFS solution would
result in widespread shower activity in our area on Friday night
and Saturday, with showers potentially continuing into next
Sunday. The canadian is similar to the gfs. Have introduced shower
chances to the for forecast Friday night and Saturday. But this
portion of the extended forecast is low confidence, as one would
expect with a cutoff low scenario during the spring months.

Aviation As of 10:32 am pdt Sunday... For 18z tafs. Satellite
imagery showing patchy coastal stratus beginning to dissipate.VFR
conditions expected before the redevelopment of low clouds and
possibly patchy fog in the north bay monterey bay tonight into
tomorrow morning. Generally light winds this morning turning
onshore this afternoon at 10-20 kt.

Vicinity of ksfo...VFR conditions to prevail through the period
with mainly high clouds. Light winds will continue this morning
before increasing to 10-20 kt this afternoon, with higher gusts
possible.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr lifr conditions remain at kmry this
morning. Stratus along the coast is finally beginning to show
signs of dissipating on visible satellite imagery. For now
expectingVFR conditions to develop over the next couple of hours,
taf may be amended as needed. Possible redevelopment of stratus
overnight tonight although timing is uncertain. Onshore winds this
afternoon 10-15 kt.

Marine As of 01:52 pm pdt Sunday... Moderate to locally gusty
northwest winds will continue today across the waters as high
pressure sits over the eastern pacific. Brisk winds will likely
continue to generate steep wind waves and fresh swell resulting in
choppy seas through the rest of today. Winds will gradually
diminish tonight into tomorrow.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pt arena to pt reyes 0-10 nm until 9 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 9 pm
public forecast: rww
aviation: as
marine: as
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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 mi32 min NW 16 G 19 52°F 50°F1015.8 hPa (-1.2)48°F
PRYC1 - 9415020 - Point Reyes, CA 18 mi44 min WNW 15 G 22 54°F1014.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi42 min NW 16 G 18 52°F 52°F8 ft1015.2 hPa (-1.1)
46237 - San Francisco Bar, CA (142) 37 mi62 min 57°F7 ft
RCMC1 - 9414863 - Richmond, CA 38 mi44 min WSW 2.9 G 4.1 68°F 58°F1014 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi44 min WSW 4.1 G 7 66°F 1014.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi44 min WSW 2.9 G 5.1 66°F 1014.1 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi44 min WSW 14 G 20 57°F 57°F1014.9 hPa
PXSC1 44 mi44 min 72°F 52°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi44 min WSW 5.1 G 8.9 73°F 1013.5 hPa
OBXC1 46 mi44 min 65°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi44 min W 6 G 7
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi44 min WNW 8.9 G 9.9 62°F 1014.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi44 min E 1.9 G 4.1 77°F 61°F1014.2 hPa55°F
AAMC1 - 9414750 - Alameda, CA 49 mi44 min W 6 G 8 68°F 63°F1014.4 hPa
LNDC1 49 mi44 min W 4.1 G 7 71°F 1014.2 hPa

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA20 mi39 minS 710.00 miPartly Cloudy78°F59°F52%1012.9 hPa
Petaluma Municipal Airport, CA20 mi57 minNNW 310.00 miFair75°F59°F57%1014.2 hPa
Novato / Gnoss Field, CA24 mi57 minN 010.00 miFair77°F53°F44%1014.2 hPa

Wind History from O69 (wind in knots)
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Last 24hrW1066
G14
NW4NW3NW3NW3CalmCalmCalmCalmCalmCalmCalmE3CalmCalmCalmCalmE3CalmCalmNW3NW3
1 day ago6
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W8W7NW5CalmNW3CalmNW3N3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW3CalmNW4
2 days agoW10
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W8SW6SW7CalmNW3NW4CalmCalmN4CalmN3CalmCalmCalmCalmCalmCalmCalm4NW5W9NW7
G13

Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
Click for Map
Sun -- 02:02 AM PDT     Moonset
Sun -- 04:38 AM PDT     4.62 feet High Tide
Sun -- 06:26 AM PDT     Sunrise
Sun -- 12:14 PM PDT     -0.62 feet Low Tide
Sun -- 12:19 PM PDT     Moonrise
Sun -- 02:46 PM PDT     First Quarter
Sun -- 07:19 PM PDT     3.71 feet High Tide
Sun -- 07:54 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.633.64.14.54.64.23.52.51.40.5-0.3-0.6-0.50.10.91.92.83.43.73.63.432.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sun -- 12:09 AM PDT     0.00 knots Slack
Sun -- 02:02 AM PDT     Moonset
Sun -- 02:49 AM PDT     0.54 knots Max Flood
Sun -- 05:30 AM PDT     -0.00 knots Slack
Sun -- 06:27 AM PDT     Sunrise
Sun -- 08:57 AM PDT     -1.21 knots Max Ebb
Sun -- 12:20 PM PDT     Moonrise
Sun -- 01:04 PM PDT     0.00 knots Slack
Sun -- 02:46 PM PDT     First Quarter
Sun -- 04:16 PM PDT     0.96 knots Max Flood
Sun -- 07:43 PM PDT     -0.00 knots Slack
Sun -- 07:54 PM PDT     Sunset
Sun -- 09:55 PM PDT     -0.58 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-00.20.50.50.40.2-0.2-0.7-1.1-1.2-1.1-0.8-0.5-00.40.810.90.70.3-0.1-0.5-0.6-0.5

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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (17,4,5,8)
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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.