Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Avalon, 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 6:08AMSunset 7:34PM Wednesday April 25, 2018 6:51 PM PDT (01:51 UTC) Moonrise 3:25PMMoonset 3:52AM Illumination 82% Phase: Waxing Gibbous; Moon at 11 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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PZZ655 Inner Waters From Point Mugu To San Mateo Pt. Ca Including Santa Catalina And Anacapa Islands- 206 Pm Pdt Wed Apr 25 2018
Tonight..W winds 10 to 15 kt, becoming 5 to 10 kt after midnight. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 14 seconds and S 2 ft at 16 seconds.
Thu..W winds 5 to 10 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 13 seconds and S 3 ft at 15 seconds.
Thu night..W winds 10 to 15 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 13 seconds and S 3 ft at 15 seconds.
Fri..Winds variable 10 kt or less, becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 4 ft at 11 seconds and S 3 ft at 15 seconds.
Fri night..Western portion, W winds 20 to 25 kt. Elsewhere, W winds 5 to 10 kt. Combined seas 5 to 7 ft dominant period 11 seconds.
Sat..N winds 10 to 15 kt, becoming W 15 to 25 kt with gusts to 30 kt in the afternoon. Combined seas 4 to 6 ft dominant period 11 seconds.
Sat night..W winds 15 to 25 kt with gusts to 30 kt, becoming E 5 to 10 kt after midnight. Combined seas 5 to 7 ft dominant period 11 seconds, subsiding to 4 to 5 ft dominant period 11 seconds after midnight.
Sun..W winds 15 to 25 kt with gusts to 30 kt. Combined seas 5 to 7 ft.
Mon..W winds 20 to 30 kt with gusts to 40 kt. Combined seas 5 to 7 ft.
PZZ600 206 Pm Pdt Wed Apr 25 2018
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 1020 mb surface high was about 250 nm south-southwest of point conception, while a 1009 mb low was near yuma az.

7 Day Forecast for Marine Location Near Avalon, CA
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location: 33.51, -118.64     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 260008 aaa
afdlox
area forecast discussion... Updated
national weather service los angeles oxnard ca
508 pm pdt Wed apr 25 2018
updated aviation discussion

Synopsis 25 507 pm.

A trough of low pressure will approach the west coast through
Friday before settling over the region through early next week.

This will result in a gradual cooling trend with increasing night
to morning low clouds through Friday. It will be breezy at times
in the evening to overnight hours and near normal temperatures
will continue through the weekend.

Short term (tdy-sat) 25 1214 pm.

Southwest flow aloft and increasing onshore flow are the themes
for the next few days as a large low pressure trough dominates
across the eastern pacific ocean. This pattern will result in a
deeper marine layer through Saturday with locally gusty southwest
winds through the highway 14 corridor of the san gabriels and into
the antelope valley. Pressure gradients increase 2-3 mb over today
and reach a peak of 9.5 mb between lax-dag on Thursday afternoon.

Wrf high-res model data also shows sustained winds over 25kts so
would expect a wind advisory will be needed for the av for the
afternoon and evening time frame.

There will be weak north winds for the western canyons of the
south santa barbara coast this evening. This may be just enough to
kick stratus southward off the coast by Thursday morning, and
models support this idea. Elsewhere, the low clouds and patchy fog
may gray pattern will persist overnight and through the morning
hours through Saturday. Temperatures will remain rather cool near
the beaches and normal for inland valleys and mountains. Stronger
onshore flow tomorrow will result in gusty west winds for the
central coast in the afternoon. Then, we will see sundowner season
get fully underway both Thursday and Friday evenings as north
winds kick in for passes and canyons west of santa barbara.

Advisory level winds look likely to occur with the sba-smx
pressure gradient peaking between 4-5mb late Friday and again late
Saturday.

Long term (sun-wed) 25 1228 pm.

Confidence in the longer term forecast is moderate. The eastern
pacific low pressure trough moves inland across northern
california and oregon over the weekend, then carves a trough
throughout the great basin early next week. This brings a more
northerly wind pattern into southwest california with periods of
gusty north-northwest winds across the region. Depending on the
location of the trough and or low pressure systems we could see
some light showers in the mountains early in the week, but this
scenario is an outlier and chances will remain under 15 percent.

The ECMWF and to a lesser degree on the gfs, high pressure will
build into the west coast by mid-week with temperatures rebounding
on Wednesday with the start of a warming trend and weak offshore
flow for the later part of the week.

Aviation 26 0006z.

At 2314z at klax, the marine layer was near 800 feet deep. The
top of the inversion was near 1700 feet with a temperature around
19 c.

Moderate confidence overall in the 00z tafs. A marine layer pattern
with low clouds and lifr ifr MVFR CIGS is expected for the coast and
adjacent vly airfields tonight and Thu morning. Low clouds are
forecast to develop between 03z at koxr to 11z at kvny, then clear
toVFR between late Thu morning to early Thu afternoon, with the
latest clearing expected at klax and koxr around 21z Thu afternoon.

The timing of the onset and clearing of the low clouds could be off
+ - an hour or two, and there is also a 20%-30% chance the low
clouds may persist most of the day at koxr, ksmo and klax.

A brief period of low clouds with MVFR CIGS should affect kprb from
about 14z-18z Thu morning as well, but the low clouds could move in
1 to 2 hours sooner, and there is a 20%-30% chance of ifr cigs.

For kwjf and kpmd, hi confidence in the 00z tafs withVFR conditions
thought Thu afternoon. Gusty SW winds can also be expected by late
thu afternoon.

Klax... Moderate confidence overall in the 00z taf. Low clouds with
MVFR CIGS are expected from about 05z-21z tonight and thu, withVFR
conditions for the rest of the afternoon and early evening before
MVFR CIGS develop again around 03z Thu evening. The timing of the
onset and clearing of the low clouds could be off + - an hour or
two, and there is also a 20%-30% chance the low clouds may persist
most of the day at the airfield.

Kbur... Moderate confidence overall in the 00z taf. Low clouds with
MVFR CIGS are expected from about 10z-1630z tonight and Thu morning,
withVFR conditions for the rest of the time. The timing of the
onset and clearing of the low clouds could be off + - an hour or two.

Marine 25 1143 am.

High confidence in winds and seas remaining below small craft
advisory levels across the waters through Thursday morning. Winds
will likely increase across the outer waters Thursday afternoon
through much of the following week. A gale watch has been issued
for the two southern outer water zones starting Friday afternoon
and continuing through early Monday afternoon. There is a 50%
chance gale force winds will continue across the same area into
early next week. NW winds will continue to be gusty across the
northern outer waters zone but should remain below gale levels.

There is a 70% chance that small craft advisory (sca) gusts will
occur during the the same time period as the gale watch and into
early next week. Expect building short period seas during this
time as well that will translate into the inner waters.

Inner waters for areas S of point conception... Waters should be
mostly quiet through Friday morning, then strong SCA level gusts
and a 40% chance that gale force winds could affect the western
portion of the eastern sba channel Friday afternoon and evening.

Gusty NW winds will become more widespread across the entire inner
waters Saturday. 70% chance for SCA winds and 30% chance for gale
force winds western portion of eastern sba channel in the
afternoon.There will be a 40% chance for SCA across the inner
waters from point sal north on Friday, and 70% chance for
Saturday. Winds should taper off a bit Sunday for all inner water
locations with a 30% chance for a sca.

Lox watches warnings advisories
Ca... None.

Pz... Gale watch in effect from Friday afternoon through late
Sunday night for zones 673-676. (see laxmwwlox).

Hazard potential outlook (sat-wed)
There will be potential gale force winds mainly for the outer
coastal waters during the outlook period.

Public... Boldt
aviation... Sirard
marine... Kaplan
synopsis... Rm b
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46222 - San Pedro, CA (092) 19 mi51 min 58°F3 ft
46262 23 mi51 min 60°F3 ft
46221 - Santa Monica Bay, CA (028) 24 mi51 min 60°F2 ft
OHBC1 - 9410660 - Los Angeles, CA 24 mi51 min 58°F1016.2 hPa (-1.2)
46253 25 mi51 min 61°F3 ft
46025 - Santa Monica Basin - 33NM West Southwest of Santa Monica, CA 27 mi41 min W 12 G 14 1016.5 hPa
46256 27 mi51 min 57°F3 ft
PSXC1 28 mi51 min NW 2.9 G 6
PFXC1 28 mi51 min WSW 6 G 8 67°F
PRJC1 29 mi51 min WSW 16 G 17
ICAC1 - 9410840 - Santa Monica Pier 35 mi51 min WSW 9.9 G 11 57°F 62°F1016.9 hPa (-1.1)

Wind History for Angels Gate, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Avalon Catalina Airport, CA14 mi60 minSW 810.00 miFair58°F30°F35%1016.9 hPa

Wind History from AVX (wind in knots)
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Last 24hrW6W5CalmCalmSW4CalmCalmSE3E6NE7E6NE7CalmCalmW4SW6W7W7W7W6W6SW5SW6SW8
1 day agoW6W10NW4NW5W5NW3N3W4CalmW3NW5CalmN3E3S4SW4SW8W5W5W8SW5SW8SW7W6
2 days agoW13
G19
W12W9CalmNW3N6N5NW3NW3CalmSW3CalmCalmCalmSW3S4SW5W5W7W8W8W10SW12W10

Tide / Current Tables for Catalina Harbor, California
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Catalina Harbor
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Wed -- 01:09 AM PDT     1.39 feet Low Tide
Wed -- 03:51 AM PDT     Moonset
Wed -- 06:11 AM PDT     Sunrise
Wed -- 06:52 AM PDT     4.47 feet High Tide
Wed -- 01:29 PM PDT     -0.29 feet Low Tide
Wed -- 03:24 PM PDT     Moonrise
Wed -- 07:32 PM PDT     Sunset
Wed -- 07:57 PM PDT     4.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.41.52.12.93.74.34.54.23.42.41.30.3-0.2-0.20.41.42.63.74.44.74.43.72.7

Tide / Current Tables for Catalina Harbor, Santa Catalina Island, California
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Catalina Harbor
Click for Map
Wed -- 01:07 AM PDT     1.46 feet Low Tide
Wed -- 03:51 AM PDT     Moonset
Wed -- 06:11 AM PDT     Sunrise
Wed -- 06:47 AM PDT     4.49 feet High Tide
Wed -- 01:29 PM PDT     -0.26 feet Low Tide
Wed -- 03:24 PM PDT     Moonrise
Wed -- 07:32 PM PDT     Sunset
Wed -- 07:55 PM PDT     4.66 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.51.62.233.84.34.54.13.42.31.20.3-0.2-0.20.41.42.63.74.44.74.43.72.7

Weather Map and Satellite Images
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GOES 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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Wind Forecast for Los Angeles/Oxnard, CA (21,6,7,8)
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Ground Weather Radar Station Santa Ana Mtns, 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.