Saturday, September21, 2019 L-36.com


Marine Weather and Tides
Pismo Beach, 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 6:47AMSunset 7:03PM Friday September 20, 2019 10:17 PM PDT (05:17 UTC) Moonrise 10:10PMMoonset 11:46AM Illumination 54% Phase: Third Quarter Moon; Moon at 22 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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PZZ645 Point Piedras Blancas To Point Sal Westward Out To 10 Nm- 823 Pm Pdt Fri Sep 20 2019
Tonight..NW winds 10 to 20 kt with local gusts to 25 kt in the evening, becoming N 5 to 10 kt. Wind waves 2 to 3 ft. NW swell 5 to 6 ft at 10 seconds.
Sat..Winds variable 10 kt or less, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 4 to 6 ft at 9 seconds.
Sat night..NW winds 10 to 15 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. NW swell 4 to 5 ft at 9 seconds.
Sun..Winds variable 10 kt or less, becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 4 to 6 ft at 8 seconds.
Sun night..NW winds 15 to 20 kt with gusts to 25 kt in the evening, becoming 5 to 10 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 9 seconds.
Mon..Winds variable 10 kt or less, becoming nw 10 to 20 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 7 ft at 9 seconds.
Mon night..NW winds 10 to 15 kt in the evening, becoming N 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft at 11 seconds.
Tue..NW winds 15 to 20 kt. Combined seas 5 to 7 ft.
Wed..SW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft.
PZZ600 823 Pm Pdt Fri Sep 20 2019
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 03z, or 8 pm pdt, a 1026 mb surface high was centered about 900 nm nw of point conception, and a 1008 mb low was over southern az. Moderate nw winds will return to the outer waters late Sunday and Monday.


7 Day Forecast for Marine Location Near Pismo Beach, CA
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location: 35.03, -120.79     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 210306
afdlox
area forecast discussion
national weather service los angeles oxnard ca
806 pm pdt Fri sep 20 2019

Synopsis 20 717 pm.

Above normal temperatures and areas of gusty north to northeast
winds will continue through this weekend. Onshore flow returns
Sunday night with the approach of an inside slider low pressure
center. As this low cuts off Monday night, offshore flow returns
Tuesday and Wednesday of next week.

Short term (fri-mon) 20 800 pm.

***update***
northerly winds are affecting portions of southwest california
this evening, strongest along the western santa barbara south
coast where local gusts between 30 to 35 mph are noted between
gaviota and refugio. Winds are expected to shift to the northeast
later tonight as weak high pressure pushes from the offshore
waters into the northern great basin. A weak offshore gradient
will set up over the area, with northeast winds 15 to 25 mph
across the ventura and l.A. Mountains and the eastern ventura
and santa clarita valleys, and over the santa monicas. Most areas
will remain clear overnight, except for a chance of low clouds
and fog over the l.A basin late tonight into Saturday morning.

Temperatures are expected to increase by 5 to 10 degrees across
the area tomorrow as heights rise and offshore winds result in
compressional warming.

***from previous discussion***
offshore trends continue into Sunday morning but a trough hitting
the pac NW will reverse those trends by afternoon. So another warm
day expect but beaches may cool a degree or two from Saturday
while other areas are similar or slightly warmer.

Models now in excellent agreement on the path of the trough, which
closely mirrors the trends we saw yesterday in the GFS and ecmwf
ensembles. It's now expected to dig along the west coast Sunday
night into Monday but take a slightly inland trajectory as it does
with a semi-cutoff upper low settling over palm springs Monday
night. The inside track will starve it of moisture. However,
increasing onshore flow Monday along with cooling aloft will drop
highs 5-10 degrees from Sunday. We also will likely see some
marine layer clouds returning to coast and valley areas. Have
indicated a mostly sunny day by afternoon but depending on the
timing and exact track of the trough clouds may be much slower to
clear which would also mean a cooler day than currently forecast.

So probably little change in temps except warmer across far inland
areas as the low moves farther away.

Long term (tue-fri) 20 211 pm.

Model agreement continues throughout the rest of next week
showing the upper low moving into mexico Tuesday and Wednesday
before ejecting east as a much colder trough drops south out of
canada Thu fri. For Tuesday the pattern looks good for a more
traditional, though still fairly low end santa ana event with
much better upper support due to the track of the low. Models are
still pretty conservative with the pressure gradient forecast but
we'll see how this GOES as we get closer to Tuesday and it gets
into the time window of our higher res models. Regardless most
coast valley areas should warm up several degrees with the
downslope warming effects, though inland areas likely will be
slower to warm up. Conditions not as favorable for wind on
Wednesday as we lose some of the upper support but gradients may
end up being stronger with temps about the same as or slightly
than Tuesday.

Forecast gets more interesting later in the week, especially by
Friday and next weekend as models have been very consistent
showing an unseasonably cold trough dropping south along the west
coast. It looks like this one too will be just inland enough to
minimize its moisture intake but significant cooling aloft will
likely lead to a rapid deepening of the marine layer by Friday
with possibly some drizzle light rain, especially south of pt
conception. Have introduced some low pops across these areas for
Friday and cooled temps quite a bit, though possibly not enough if
current model solutions hold. And it looks like this
cooler cloudier pattern will continue through next weekend as
well, though it's unlikely we'll see any significant precip.

Mainly just periods of drizzle light showers with amounts under a
quarter inch.

Aviation 20 2353z.

At 2300z at lax, there was a moist layer up to 3000 ft with no
significant inversion. The temperature at 3000 ft was 18 deg c.

N of point conception... Moderate to high confidence in 00z tafs
withVFR conditions expected, except for a 30% chance of ifr
cigs br in valleys south of ksmx between 09z-15z sat.

S of point conception... Moderate confidence in 00z tafs for
coastal sites, and high confidence inVFR conditions inland.

There is a 30% chance of ifr conditions for the ventura co. Sites
overnight, and a 40% chance that the l.A. Coastal sites remainVFR
through the period.

Klax... Moderate confidence in the 00z taf. Ifr conds expected
between 12z-17z, but timing may differ by + - 2 hrs from taf
times. There is a 40% chance conds remainVFR.

Kbur... High confidence in the 00z TAF with cavu skies through the
period.

Marine 20 712 pm.

Moderate confidence in the current forecast.

For the outer waters, NW wind gusts to 25 kt have become
widespread enough to warrant issuance of a SCA for the two
northern zones (pzz673-670). Slightly weaker winds are expected
Saturday, then there is a 60% chance for SCA gusts returning
late Sunday afternoon through Monday.

Across the inner waters north of pt sal, local gusts to 25 kt will
be possible through late this evening over the western portion of
the zone. There will be a 30% chance for (sca) gusts Sunday
afternoon, and again during the afternoon hours Monday and
Tuesday. The inner waters south of point conception should remain
below SCA conditions through Wednesday.

Lox watches warnings advisories
Ca... None.

Pz... Small craft advisory in effect until 3 am pdt Saturday for
zones 670-673. (see laxmwwlox).

Hazard potential outlook (mon-fri)
On Tuesday and Wednesday, there is a chance of a santa ana wind
event as well as elevated fire weather conditions.

Public... Mw smith
aviation... Smith
marine... Smith
synopsis... Tf
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSLC1 - 9412110 - Port San Luis, CA 10 mi47 min Calm G 1.9 69°F 58°F1012.7 hPa
CPXC1 10 mi23 min WSW 1.9 G 2.9 64°F 1012.5 hPa52°F
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 13 mi87 min 62°F 60°F6 ft1012 hPa (+0.4)
46215 - Diablo Canyon, CA (076) 13 mi47 min 59°F4 ft
PTGC1 - Point Arguello, CA 32 mi77 min N 18 G 20 61°F 1011.7 hPa (+0.6)
HRVC1 39 mi47 min 60°F 1012.5 hPa
46218 - Harvest, CA (071) 40 mi47 min 61°F6 ft
46259 42 mi47 min 62°F7 ft

Wind History for Port San Luis, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Luis Obispo, San Luis Obispo County-Mc Chesney Field, CA17 mi21 minWNW 410.00 miFair60°F53°F78%1012.2 hPa
Santa Maria Public Airport/Capt G Allan Hancock Field, CA20 mi26 minN 010.00 miFair62°F48°F62%1012.4 hPa
Lompoc, Vandenberg Air Force Base, CA23 mi79 minN 010.00 miFair55°F49°F82%1012.8 hPa

Link to 5 minute data for KSBP

Wind History from SBP (wind in knots)
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Last 24hrCalmCalmE3SE4SE3E5SE4CalmNW8SE5W7N5CalmN9W10
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1 day agoW4NW6W4W3W4CalmCalmCalmNW4NW9N9NW11NW12NW13NW17NW20NW19NW20
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Tide / Current Tables for Avila, California
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Avila
Click for Map
Sat -- 04:44 AM PDT     0.29 feet High Tide
Sat -- 06:50 AM PDT     Sunrise
Sat -- 08:37 AM PDT     -0.22 feet Low Tide
Sat -- 01:46 PM PDT     Moonset
Sat -- 03:17 PM PDT     2.09 feet High Tide
Sat -- 07:01 PM PDT     Sunset
Sat -- 07:43 PM PDT     Last Quarter
Sat -- 11:12 PM PDT     -2.26 feet Low Tide
Sat -- 11:58 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.5-0.9-0.400.20.30.2-0-0.2-0.2-00.30.81.41.82.121.610.2-0.7-1.5-2-2.3

Tide / Current Tables for Port San Luis, Pacific Ocean, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map
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wmap_P
GEOS Local Image of Southwest    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 Los Angeles/Oxnard, CA (1,6,7,8)
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Ground Weather Radar Station Vandenberg AFB, 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.