Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Pismo Beach, 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 6:49AMSunset 7:00PM Thursday September 21, 2017 2:22 PM PDT (21:22 UTC) Moonrise 7:13AMMoonset 7:14PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 212 Pm Pdt Thu Sep 21 2017
.small craft advisory in effect through late tonight...
Tonight..NW winds 15 to 25 kt with local gusts to 35 kt in the evening...becoming 15 to 25 kt. Combined seas 6 to 8 ft dominant period 11 seconds.
Fri..Winds variable 10 kt or less...becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 6 ft at 11 seconds.
Fri night..NW winds 15 to 20 kt with gusts to 25 kt in the evening...becoming 10 to 15 kt. Wind waves 2 to 4 ft. NW swell 5 to 6 ft at 12 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 5 to 6 ft at 12 seconds.
Sat 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 6 ft at 12 seconds.
Sun..N winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft.
Sun 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 6 ft.
Mon..NW winds 10 to 15 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft.
Tue..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft.
PZZ600 212 Pm Pdt Thu Sep 21 2017
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 21z...or 2 pm pdt...a weak frontal system will move over the coastal waters today. Winds will increase to moderate to strong by this afternoon and evening along with building short-period steep seas.

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 212048
afdlox
area forecast discussion
national weather service los angeles oxnard ca
148 pm pdt Thu sep 21 2017

Synopsis
An upper level trough of low pressure will remain over the western
united states through Saturday resulting in cooler than usual and
breezy conditions. An upper level ridge of high pressure and weak
offshore flow will setup Sunday through the middle of next week,
with warmer than usual conditions and minimal marine layer.

Short term (tdy-sun)
a pretty impressive cold front for september moved through the
area this afternoon. Ahead of it the marine layer deepened to
almost 6000' and ample lift in the lower layers helped generate
widespread drizzle and light rain across central and eastern la
county. Parts of the foothills and lower mountain slopes received
a quarter to half inch of rain while most other areas got under a
tenth. Behind the front cooler drier air is moving in and clouds
are clearing pretty rapidly in most areas except still some
lingering overcast conditions across the san gabriel valley and
adjacent mountains. Some locally gusty winds are developing behind
the front as well, so far all below advisory levels but we could
see some isolated advisory level wind gusts across western sb
county and the av.

The cool air aloft will maintain a weak inversion tonight and
likely Friday night as well so low clouds will struggle to form.

Will likely have some patches here and there but not expecting
anything close to a solid marine layer. With less clouds the next
couple nights it will definitely start feeling a lot more like
fall with cooler temperatures. Another day of well below normal
temps Friday with highs mostly in the 70s, then a little warmer
inland Saturday while a coastal eddy and weak onshore flow
maintain similar temps at the coast.

On Sunday pressure gradients turn 1-2mb offshore but still very
little support aloft. Forecast sounding from coastal areas south
of sb show a stronger inversion developing and 90-100% humidities
in the boundary layer so unless we see some better winds aloft or
a much stronger gradient developing it's likely at least the la
county coast will see some low clouds and maybe some dense fog to
start the day. Still some warming expected Sunday but more so for
the valleys than the coast.

Long term (mon-thu)
offshore gradients strengthen slightly each day through Tuesday
which corresponds to the best period of upper level support with
some additional energy dropping into the trough. As a result the
breeziest day (still likely below advisory levels) still appears
to be Tuesday and we'll also see a corresponding jump in
temperatures that day as well. Gradients and upper support weaken
wed Thu but air mass warms up as high pressure builds in from the
west. Coast and valleys could actually see slight cooling wed
with the weaker offshore flow, however mtns and av will continue
to warm through the period. Models continue to show light offshore
flow and warm temps continuing right on through next weekend.

Aviation 21 1800z.

At 1720z at klax... A weak marine inversion is not long for this
world. A dry cold front will eliminate the marine inversion in a
couple of hours.

Low to moderate confidence in the current tafs. A dry cold front
is sweeping through la county this morning with rather impressive
clearing behind it. Many TAF sites will enjoyVFR conditions by
late this afternoon.

Klax and kbur... Moderate confidence in the current taf. Primarily
vfr conditions through the period. There is a 30 percent chance
of MVFR ceilings reforming overnight.

Marine 21 200 pm.

Northwest winds across the outer waters will be at gale warning
levels through late tonight. Scas will likely be issued for Friday
as the winds begin to diminish on Friday.

A fairly low confidence forecast today as wind speeds are falling
right on the criteria cutoff point between categories. Northwest
winds will continue at SCA level across all of the inner waters
through this evening or even overnight. Nearshore winds along
central coast and across the western santa barbara channel may
increase to gale warning level by late afternoon.

Steep short-period seas are likely on this afternoon and evening
across much of the waters.

Lox watches warnings advisories
Ca... Wind advisory in effect until 9 pm pdt this evening for zones
34-35. (see laxnpwlox).

Wind advisory in effect until 4 am pdt Friday for zones
39-52. (see laxnpwlox).

Wind advisory in effect until 10 pm pdt this evening for zone
59. (see laxnpwlox).

Pz... Small craft advisory in effect until 3 am pdt Friday for
zones 645-650-655. (see laxmwwlox).

Gale warning in effect until 3 am pdt Friday for zones
670-673-676. (see laxmwwlox).

Hazard potential outlook (sun-thu)
no significant hazards expected.

Public... Mw
aviation... Sweet
marine... Sweet
synopsis... Kittell
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 mi52 min WNW 9.9 G 21 65°F 59°F1013.3 hPa
CPXC1 10 mi110 min W 19 G 24 64°F 1013.2 hPa49°F
46215 - Diablo Canyon, CA (076) 13 mi55 min 58°F6 ft
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 13 mi92 min NW 19 G 23 61°F 60°F7 ft1013.3 hPa (+0.0)
PTGC1 - Point Arguello, CA 32 mi82 min NNW 22 G 24 59°F 1013.4 hPa (-0.3)
HRVC1 39 mi52 min 60°F 1013.7 hPa
46218 - Harvest, CA (071) 40 mi52 min 59°F9 ft

Wind History for Port San Luis, CA
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W16
G21
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G18
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N3
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G6
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W18
G22
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N9
G16
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S1
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S1
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SE1
N11
G14
N9
G13
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G15
W24
G29
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NW18
G23
NW12
G16
W14
G18
W10
G14
E6
NW7
NE3
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N2
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W6
G9
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W8
NW1
W1
SE1
SW2
S6
E3
NW7
G13
W10
G14
W4
G7
W11
G17
W22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Luis Obispo, San Luis Obispo County-Mc Chesney Field, CA17 mi26 minNW 21 G 2910.00 miPartly Cloudy and Breezy69°F46°F45%1012 hPa
Santa Maria Public Airport/Capt G Allan Hancock Field, CA20 mi31 minWNW 239.00 miA Few Clouds and Windy67°F50°F55%1012 hPa
Lompoc, Vandenberg Air Force Base, CA23 mi87 minNW 2010.00 miA Few Clouds and Breezy65°F51°F62%1013.7 hPa

Wind History from SBP (wind in knots)
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Last 24hrNW21
G27
NW20NW18
G22
NW14NW11NW8NW8NW7N3NW3CalmNW33NW7NW5CalmCalmNW6NW4NW4W8NW17NW19
G25
NW21
G29
1 day agoNW22
G30
NW20
G29
NW22
G29
NW14
G21
NW14NW13W6W6Calm4W5W4W43W8NW11N12NW13NW14NW12NW15NW14NW21NW19
G26
2 days agoNW21
G28
NW19
G28
NW15NW13NW11NW11NW6CalmSW3S3S3CalmCalmNW13NW12NW13W7N10
G18
NW15
G21
NW14NW13
G16
NW13NW20NW19

Tide / Current Tables for Avila, California
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Avila
Click for Map
Thu -- 05:06 AM PDT     -2.50 feet Low Tide
Thu -- 06:50 AM PDT     Sunrise
Thu -- 08:12 AM PDT     Moonrise
Thu -- 11:20 AM PDT     2.14 feet High Tide
Thu -- 05:27 PM PDT     -2.02 feet Low Tide
Thu -- 07:00 PM PDT     Sunset
Thu -- 08:14 PM PDT     Moonset
Thu -- 11:31 PM PDT     2.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91-0.2-1.3-2.2-2.5-2.3-1.5-0.40.81.72.121.40.4-0.6-1.5-2-1.9-1.4-0.50.61.52

Tide / Current Tables for Port San Luis, Pacific Ocean, California
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Port San Luis
Click for Map
Thu -- 05:15 AM PDT     0.63 feet Low Tide
Thu -- 06:50 AM PDT     Sunrise
Thu -- 08:12 AM PDT     Moonrise
Thu -- 11:27 AM PDT     5.27 feet High Tide
Thu -- 05:40 PM PDT     0.79 feet Low Tide
Thu -- 07:00 PM PDT     Sunset
Thu -- 08:14 PM PDT     Moonset
Thu -- 11:47 PM PDT     4.93 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
54.33.121.10.70.81.52.53.74.75.25.24.63.62.51.50.90.81.32.13.24.14.8

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

GOES Local Image of Southwest    EDIT
Geos

Wind Forecast for Los Angeles/Oxnard, CA (17,4,5,8)
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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.