Wednesday, September20, 2017 L-36.com


Marine Weather and Tides
Channel Islands 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 6:43AMSunset 6:56PM Wednesday September 20, 2017 12:38 AM PDT (07:38 UTC) Moonrise 7:07AMMoonset 7:34PM Illumination 0% Phase: New Moon; Moon at 29 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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PZZ650 East Santa Barbara Channel From Pt. Conception To Pt. Mugu Ca Including Santa Cruz Island- 858 Pm Pdt Tue Sep 19 2017
.small craft advisory in effect until 3 am pdt Wednesday...
Tonight..Western portion...nw winds 15 to 20 kt. Eastern portion... SW winds 5 to 10 kt becoming se after midnight. Combined seas 6 to 8 ft dominant period 10 seconds...subsiding to 4 to 6 ft dominant period 10 seconds after midnight.
Wed..E winds 10 to 15 kt...becoming S 10 kt in the afternoon. Wind waves 2 ft or less. W swell 4 to 6 ft at 10 seconds.
Wed night..Western portion...w winds 15 to 20 kt. Eastern portion...sw winds 5 to 10 kt becoming variable 10 kt or less after midnight. Combined seas 4 to 6 ft dominant period 10 seconds.
Thu..Western portion...nw winds 15 to 20 kt becoming 20 to 25 kt in the afternoon. Eastern portion...winds variable 10 kt or less becoming W 10 to 15 kt in the afternoon. Combined seas 5 to 7 ft dominant period 10 seconds.
Thu night..Western portion...nw winds 20 to 25 kt. Eastern portion...w winds 10 to 15 kt. Combined seas 4 to 6 ft dominant period 10 seconds.
Fri..W winds 10 to 15 kt...becoming 15 to 20 kt with gusts to 25 kt in the afternoon. Wind waves 2 ft or less. W swell 4 to 5 ft at 10 seconds.
Fri night..Western portion...w winds 20 to 25 kt becoming nw 15 to 20 kt after midnight. Eastern portion...sw winds 15 to 20 kt becoming nw 5 to 10 kt after midnight. Wind waves 1 to 3 ft. W swell 4 to 5 ft.
Sat..NW winds 10 to 15 kt. Wind waves 2 ft or less. W swell 4 to 5 ft.
Sun..NW winds 10 to 15 kt. Wind waves 2 ft or less. W swell 4 to 5 ft.
PZZ600 858 Pm Pdt Tue Sep 19 2017
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 1030 mb high pressure center was located 1100 nm west of san francisco and a 1005 mb thermal low was located near las vegas. Moderate to strong northwest flow will continue across the northern inner waters and outer waters, with light to moderate westerly flow across the southern inner waters. A long period northwest swell and building short period waves will create hazardous combined seas.

7 Day Forecast for Marine Location Near Channel Islands Beach CDP, CA
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location: 34.15, -119.26     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 200632
afdlox
area forecast discussion
national weather service los angeles oxnard ca
1132 pm pdt Tue sep 19 2017

Synopsis
An upper level trough will continue to persist over the region
allowing for partly to mostly cloudy conditions through wednesay.

As the trough deepens, a cold front will move through the area
Thursday bringing a slight chance for a few showers and drizzle.

Cooler air behind the front will bring much cooler and breezy
conditions, especially for inland areas. Weak offshore winds are
expected to build late this weekend into early next week with
significant warming expected, especially for coast and coastal
valleys.

Short term (tue-fri)
another trough of low pressure off of victoria island will pivot
the broader troughing pattern over the west and dig south into
southern california through Friday. A weak marine inversion in
place this evening is keeping a muddled cloud pattern over the
south coast basin this evening. Clouds should fill in overnight
and into Wednesday, but lower confidence is placed in the sky
cover forecast for tonight. Highest confidence exists for los
angeles county areas, with moderate to high confidence for the
santa barbara and ventura counties.

Nam-wrf solutions are increasing winds through the interstate 5
corridor tonight and into Wednesday morning. Nam-wrf boundary
layer winds increase to 25-30 knots across the interstate 5
corridor in northern los angeles and ventura counties and 850 mb
winds increase to 40 knots across the same area. A marginal wind
advisory was added to the forecast for tonight and into Wednesday
morning.

With the troughing in place, a cooler than normal air mass should
remain across the region. As the trough's vort MAX drops south, a
showery weather pattern could develop late Wednesday night into
Thursday morning as the trough interacts with the deep marine
layer in place. NAM bufr time heights sections suggest los
angeles county areas picking up a few hundredths of
precipitation.

*** from previous discussion ***
then Thursday with the trough deepening look for the marine layer
depth to increase again south of pt conception with possibly some
morning drizzle or light rain, especially up along the south
facing slopes. Highs Thu should be 5-10 degrees cooler than wed
and 10-20 degrees below normal for inland areas. Clearing will be
slow and possibly not at all in some areas south of pt conception.

Cool and breezy along the central coast with some morning marine
layer but not as extensive as further south.

By Thursday night and early Friday with the trough axis moving
through the area it's possible the inversion will become so weak
that marine layer clouds will have a very difficult time
reforming. In any case, another day of well below normal temps
Friday with coast valleys mostly in the 70s. If marine lyr
struggles to reform Thu night at the very least some stratocu
should form during the day Friday as the low levels remain quite
moist.

Long term (sat-tue)
remainder of the forecast for the weekend into early next week
remains more or less unchanged. We'll be shifting from a deep
marine strong onshore flow pattern to an offshore santa ana
pattern but it will take a couple days for this shift to really
take effect. So still some lingering marine layer Saturday morning
but early clearing and warmer temps. Then turning weakly offshore
Sunday and slightly stronger Monday and Tuesday which should be
the warmest days of this 7 day period. Still not seeing a lot of
upper support with this offshore event but enough to boost temps
several degrees Sunday and then again Mon tue. Will have to see as
we get closer if we'll see much in the way of winds with this but
at this point the upper support doesn't quite look strong enough
to get anything more than some locally breezy conditions through
passes and canyons. We should start seeing some 90s in the valleys
by Sunday and possibly some near 90 temps for inland coastal areas
early next week. The rest of next week looks quite warm with weak
offshore flow. Not enough for advisory level winds but certainly
enough for above normal temps, especially for coastal areas which
should stay in the 80s and lower 90s all week, perhaps mid to
upper 90s around downtown la by Wed thu.

Aviation 20 0630z.

At 05z, the marine layer was around 3900 ft deep at klax. The top
of the inversion was around 6500 ft with a temperature of 18c.

Low confidence in the current forecast as a weak marine inversion
is in place across the area. Expect stratus to develop across most
coastal and valley areas south of pt conception, with generally
high MVFR CIGS or possiblyVFR CIGS expected. Clearing is expected
by mid to late morning in the valleys and by early afternoon
across the coastal plain.

Klax and kbur... Low confidence in the 06z taf. There is a 30-40%
chance that conds will remainVFR overnight, either due to no
cigs, or CIGS in the MVFR category. If MVFR CIGS develop as
expected, there is a 20-30% chance they will linger thru 22z.

Marine 19 900 pm.

Winds struggling to reach gale warning levels this evening. A gale
warning for the southern outer waters have been replaced with a
small craft advisory through 3 am Thursday morning. A gale watch
was also added for the southern outer waters from Thursday morning
through Thursday afternoon. This watch will likely need to be
extended into Thursday evening, as well. All other headlines for
the outer and northern waters have been extended until Thursday
afternoon for now, but they likely will need to extended until
early Friday morning.

Western portions of the santa barbara channel will have SCA level
winds through late tonight and possibly into each afternoon and
evening through Thursday night.

Combined seas will increase through Wednesday as building short-
period waves combine with the first northwest swell of the season.

Seas will build to 7 to 10 feet at 14 seconds on Wednesday.

Lox watches warnings advisories
Ca... Wind advisory in effect until 10 am pdt Wednesday for zones
53-54. (see laxnpwlox).

Pz... Small craft advisory in effect until 3 pm pdt Thursday for
zone 645. (see laxmwwlox).

Small craft advisory in effect until 3 am pdt Wednesday for
zone 650. (see laxmwwlox).

Gale warning in effect until 3 pm pdt Thursday for zones
670-673. (see laxmwwlox).

Small craft advisory in effect until 3 am pdt Thursday for
zone 676. (see laxmwwlox).

Gale watch in effect from late Wednesday night through
Thursday afternoon for zone 676. (see laxmwwlox).

Hazard potential outlook (fri-tue)
no significant hazards expected.

Public... Hall mw
aviation... Db
marine... Hall
synopsis... Kaplan
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46217 - Anacapa Passage, CA (111) 9 mi69 min 67°F3 ft
NTBC1 - Santa Barbara, CA - 9411340 29 mi63 min N 1 G 1.9 62°F 1011.7 hPa
46025 - Santa Monica Basin - 33NM West Southwest of Santa Monica, CA 30 mi39 min N 3.9 G 5.8 67°F1011.3 hPa (+0.0)
46251 31 mi48 min 67°F4 ft
46053 - E. SANTA BARBARA - 12NM Southwest of Santa Barbara, CA 32 mi39 min ENE 3.9 G 5.8 67°F 67°F1012.1 hPa (+0.3)62°F
46221 - Santa Monica Bay, CA (028) 39 mi69 min 70°F3 ft
ICAC1 - 9410840 - Santa Monica Pier 41 mi57 min S 1 G 1.9 66°F1012.4 hPa

Wind History for Santa Barbara, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oxnard, Oxnard Airport, CA5 mi48 minENE 410.00 miFair62°F57°F84%1011.6 hPa
Point Mugu, Naval Air Warfare Center, CA8 mi1.7 hrsN 010.00 miFair61°F55°F84%1012.1 hPa
Camarillo, Camarillo Airport, CA10 mi44 minNE 510.00 miFair64°F57°F81%1012.4 hPa

Wind History from OXR (wind in knots)
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Last 24hrSE3E5NE5E4CalmCalmCalmCalmCalmCalm3W7W7W9W12W12W12W11W7W4CalmCalmNE4NE4
1 day agoE3NE4N4NE5NE4CalmCalmNW3W44SW6SW7SW7W8SW8S8SW7W10W5SE3CalmSE3E3SE4
2 days agoCalmCalmCalmE3E3NE4NE4NE3CalmCalmCalmSW4W7W10W12W10W12W11W9W8W7W4W3Calm

Tide / Current Tables for Port Hueneme, California
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Port Hueneme
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Wed -- 04:07 AM PDT     0.04 feet Low Tide
Wed -- 06:43 AM PDT     Sunrise
Wed -- 07:06 AM PDT     Moonrise
Wed -- 10:17 AM PDT     5.47 feet High Tide
Wed -- 04:21 PM PDT     0.67 feet Low Tide
Wed -- 06:55 PM PDT     Sunset
Wed -- 07:34 PM PDT     Moonset
Wed -- 10:23 PM PDT     5.55 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.32.91.50.500.31.22.53.84.95.45.34.63.52.21.20.70.81.52.63.94.95.55.4

Tide / Current Tables for Ventura, California
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Ventura
Click for Map
Wed -- 04:10 AM PDT     0.04 feet Low Tide
Wed -- 06:44 AM PDT     Sunrise
Wed -- 07:06 AM PDT     Moonrise
Wed -- 10:16 AM PDT     5.47 feet High Tide
Wed -- 04:24 PM PDT     0.67 feet Low Tide
Wed -- 06:56 PM PDT     Sunset
Wed -- 07:34 PM PDT     Moonset
Wed -- 10:22 PM PDT     5.55 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.32.91.50.500.31.22.53.84.95.45.34.63.52.31.30.70.81.52.63.94.95.55.4

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 (3,6,7,8)
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Ground Weather Radar Station Los Angeles, 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.