Monday, December18, 2017 L-36.com


Marine Weather and Tides
San Simeon, CA

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:10AMSunset 4:54PM Monday December 18, 2017 1:04 AM PST (09:04 UTC) Moonrise 7:22AMMoonset 5:40PM Illumination 0% Phase: New Moon; Moon at 0 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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PZZ565 Point Pinos To Point Piedras Blancas To 10 Nm- 831 Pm Pst Sun Dec 17 2017
Tonight..N winds 10 kt...becoming east after midnight. Wind waves 2 ft or less. NW swell 4 to 6 ft at 12 seconds.
Mon..SW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 11 seconds.
Mon night..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 13 seconds.
Tue..S winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 16 seconds.
Tue night..S winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft at 15 seconds.
Wed..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 6 ft...becoming 4 to 6 ft. Slight chance of showers.
Thu..N winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft.
Fri..NW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
PZZ500 831 Pm Pst Sun Dec 17 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Surface high pressure 650 miles west of the bay area will gradually move southeast and weaken through early week. As a result winds will diminish tonight and remain mainly light Monday into Tuesday. South to southwest winds Tuesday precede the arrival of a moderate cold front Tuesday evening and early Wednesday morning. Modified arctic air and high pressure will build over the eastern pacific and extend into the intermountain west. Post cold frontal northwest winds will become gusty over the coastal waters and bays mid to late this week. A dry cold front will usher in a reinforcement of modified arctic air from the north and northeast beginning Saturday evening and continuing into early next week.

7 Day Forecast for Marine Location Near San Simeon, CA
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location: 35.65, -121.79     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 180645
afdmtr
area forecast discussion
national weather service san francisco bay area
1045 pm pst Sun dec 17 2017

Synopsis Dry and quiet weather Monday and Tuesday with
seasonable temperatures. A fast moving cold front will arrive
Wednesday morning with a quick shot of light rain for the morning
commute. Dry but cool and breezy at times weather returns
Wednesday afternoon through christmas eve.

Discussion As of 9:52 pm pst Sunday... No need for short term
updates tonight with mostly clear skies overhead. Offshore winds
in the hills continue to ease with temperatures now falling into
the 40s. Dewpoints are in the 30s and with lighter winds expect
widespread readings into the 30s by morning for the interior
valleys.

Monday will be another sunny and seasonably mild december
afternoon with highs back in the 60s. On Tuesday winds will turn
onshore which will lead to a few degrees of cooling ahead of an
incoming weather system as high clouds increase by Tuesday
afternoon.

Minor forecast updates were completed for the late Tuesday night
into weds morning time frame. 00z NAM and GFS guidance are in and
continue to trend wetter (in a relative sense). Scenario is
currently looking like a high pop low QPF scenario. Latest nam
solutions now show 0.20 and perhaps upwards of a quarter inch for
the north bay with a tenth or two for the greater bay area and
then lesser amounts rain shadowed interior valleys and central
coast.

System should be out of the area by weds afternoon but leaving
cool and blustery winds in its wake. High pressure to rebuild
Thursday through the upcoming holiday weekend.

Prev discussion As of 1:32 pm pst Sunday... Temperatures are
rebounding nicely after a cool december morning across the san
francisco bay area and central california coast. Temperature
observations this early afternoon are generally in the 60s with
dewpoints in the upper teens to 30s as the airmass remains dry.

Preliminary and non-operational goes-16 (tentatively scheduled to
become operational as goes-east this week) shows mostly clear
skies across the state as an upper level low continues to move
east along the arizona mexico border and an upper level ridge
builds over the eastern pacific.

In the short-term low relative humidity values and locally breezy
conditions will continue, particularly in the higher elevations.

While some locations in the north bay hills and east bay hills are
still reporting sustained winds over 20 mph, expect these winds
to continue to subside through the afternoon hours. Because the
elevated wind speeds are no longer widespread and are primarily
confined to the ridgetops and peaks, the wind advisory was allowed
to expire earlier as scheduled at 10 am pst.

The red flag warning that was issued earlier for the higher
elevations across the area was also allowed to expire at 10 am
pst. Though the humidity values will drop to 25 percent or less in
many elevated areas, the diminishing winds are what helped to
improve the fire weather conditions from "critical" to "near-
critical". That being said -- fuels still remain abnormally dry
for middle december.

The upper level ridge will begin to flatten late Monday and
Tuesday as an upper level low drops southeastward from the gulf of
alaska to the pacific northwest. The gfs, ecmwf, and canadian
models remain optimistic that parts of northern california will
receive light amounts of precipitation from late Tuesday and into
Wednesday. The big questions at this point are 1) what exact track
will the upper low take, and 2) how far south will this moisture
make it? As witnessed earlier this season, the north bay is
typically the favored location to receiving the most (if any)
rainfall. Models have trended marginally wetter over the past day,
so we'll wait and see what the 00z model runs advertise. While
rain amounts are expected to remain rather limited, any moisture
at this time would be much welcomed.

Heading into Friday and beyond, models are advertising a high-
amplitude ridge in the eastern pacific with dry weather for much
of california. Climatology tells us that december is normally the
wettest month of the year for san francisco (4.56" according to
the 1981-2010 normals). As it stands right now, downtown san
francisco has observed only 0.02" of rain so far this month. With
records going back to 1850, the first 17 days of this month mark
the 7th driest start to december on record for san francisco, and
the driest since 1989. With the climate prediction center's 8 to
14 day outlook now valid through the last day of 2017, confidence
remains fairly high that this month will conclude drier than normal.

Aviation As of 10:45 pm pst Sunday... Light offshore flow, dry
conditions supportVFR tonight and Monday. However, air temperatures
are cooler and dewpoint temperatures are higher per 24 hour trends.

Thus nocturnal cooling combining with a light mixing wind may produce
a few patches of valley fog tonight. Statistical guidance for ksts
does indicate fog development tonight, not indicated in TAF for now,
but will monitor and amend if needed overnight. Any patchy valley fog
early Monday should mix out quickly in the morning.

Late Monday night and Tuesday morning offshore pressure gradients and
winds become neutral to onshore. Increasingly milder maritime weather
influence including low clouds are quite likely Tuesday. A cold front
and rain band will be moving southeast over the area Tuesday night.

Vicinity of ksfo...VFR. Light winds.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. E-se winds near 5 knots tonight except
near 10 knots in the salinas valley. Winds becoming light variable
late Monday afternoon.

Marine As of 9:35 pm pst Sunday... Surface high pressure 650
miles west of the bay area will gradually move southeast and
weaken through early week. As a result winds will diminish tonight
and remain mainly light Monday into Tuesday. South to southwest
winds Tuesday precede the arrival of a moderate cold front Tuesday
evening and early Wednesday morning. Modified arctic air and high
pressure will build over the eastern pacific and extend into the
intermountain west. Post cold frontal northwest winds will become
gusty over the coastal waters and bays mid to late this week. A
dry cold front will usher in a reinforcement of modified arctic
air from the north and northeast beginning Saturday evening and
continuing into early next week.

Mtr watches warnings advisories
Tngt None.

Public forecast: rww
aviation marine: canepa
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46028 - CAPE SAN MARTIN - 55NM West Northwest of Morro Bay, CA 6 mi75 min N 3.9 G 3.9 58°F 58°F6 ft1019 hPa (+1.0)
46239 - Point Sur, CA (157) 51 mi35 min 55°F6 ft
46215 - Diablo Canyon, CA (076) 58 mi38 min 58°F5 ft

Wind History for Port San Luis, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Paso Robles Municipal Airport, CA62 mi72 minno data10.00 miFair33°F23°F66%1020.8 hPa

Wind History from PRB (wind in knots)
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Last 24hrCalmSE5CalmE3E6N3E5E3CalmNW5N64E10E12E11E7NE5SE8S5S3SE6S3--Calm
1 day agoW12N4E5NE4E5E7E8CalmSE3NW12NW11SE7NE7SE4NW12
G20
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2 days agoCalmCalmCalmCalmS3CalmE3CalmCalmCalmCalm3NW4CalmS4S8S8SW5W6NW12W8N9CalmNW7

Tide / Current Tables for San Simeon, California
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San Simeon
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Mon -- 03:11 AM PST     2.49 feet Low Tide
Mon -- 07:09 AM PST     Sunrise
Mon -- 07:18 AM PST     Moonrise
Mon -- 09:18 AM PST     5.66 feet High Tide
Mon -- 04:38 PM PST     -0.51 feet Low Tide
Mon -- 04:54 PM PST     Sunset
Mon -- 05:37 PM PST     Moonset
Mon -- 11:24 PM PST     3.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.53.12.72.52.63.13.84.65.35.65.54.93.92.61.30.2-0.4-0.5-00.81.82.73.43.7

Tide / Current Tables for Morro Beach, Estero Bay, California
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Morro Beach
Click for Map
Mon -- 03:13 AM PST     2.01 feet Low Tide
Mon -- 07:07 AM PST     Sunrise
Mon -- 07:17 AM PST     Moonrise
Mon -- 09:26 AM PST     5.64 feet High Tide
Mon -- 04:38 PM PST     -0.43 feet Low Tide
Mon -- 04:53 PM PST     Sunset
Mon -- 05:36 PM PST     Moonset
Mon -- 11:07 PM PST     3.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.32.72.322.12.63.44.35.15.65.6542.71.40.3-0.3-0.400.81.82.73.33.6

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (4,6,7,8)
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Ground Weather Radar Station Vandenberg AFB, CA
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weather_mapweather_map weather_map

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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.