Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Rancho Palos Verdes, 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 6:18AMSunset 7:34PM Sunday August 20, 2017 4:35 AM PDT (11:35 UTC) Moonrise 5:05AMMoonset 7:00PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 217 Am Pdt Sun Aug 20 2017
Today..Winds variable 10 kt or less...becoming sw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 ft at 10 seconds and S 3 ft at 14 seconds. Patchy fog in the morning.
Tonight..W winds 10 to 15 kt in the evening...becoming variable 10 kt or less. Wind waves 2 ft or less. Mixed swell W 2 ft at 10 seconds and S 3 ft at 13 seconds. Patchy fog after midnight.
Mon..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 ft at 10 seconds and S 2 ft at 13 seconds. Patchy fog in the morning.
Mon night..W winds 10 to 15 kt in the evening...becoming variable 10 kt or less. Wind waves 2 ft or less. Mixed swell W 2 ft at 10 seconds and S 2 ft at 12 seconds. Patchy fog after midnight.
Tue..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 ft at 9 seconds and S 2 ft at 12 seconds. Patchy fog in the morning.
Tue night..W winds 10 to 15 kt...becoming 5 to 10 kt after midnight. Wind waves 2 ft or less. Mixed swell W 2 ft at 9 seconds and S 2 ft at 12 seconds. Patchy fog after midnight.
Wed..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 ft and S 2 ft. Patchy fog.
Thu..W winds 10 to 15 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 2 ft. Patchy fog.
PZZ600 217 Am Pdt Sun Aug 20 2017
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 09z...or 2 am pdt...a 1030 mb surface high was about 600 nm W of eureka and a 1004 mb low was near las vegas.

7 Day Forecast for Marine Location Near Rancho Palos Verdes, CA
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location: 33.7, -118.31     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 201031
afdlox
area forecast discussion
national weather service los angeles oxnard ca
331 am pdt Sun aug 20 2017

Synopsis
A weak trough of low pressure off the coast will remain over the
region through Wednesday. A persistent and deep marine layer will
continue to keep a cooler air mass in place through midweek.

Through Tuesday, there is outside chance of afternoon and
evening showers and thunderstorms across the mountains and
desert, and night through morning drizzle for the coast, valleys
and foothills. A warming trend should develop for late week as
high pressure builds in.

Short term (tdy-tue)
the latest satellite imagery shows a trough of low pressure
centered near 33n and 121w, or about 125 miles west of los angeles
this morning. This trough will remain over the region, wobbling
around off the coast through Wednesday night. A deepening marine
layer and a strengthening onshore flow pattern will bring a
cooling trend across the area into at least Monday, and possibly
Tuesday or Wednesday. Model solutions hold the trough near the
bight through Monday, but slightly retrograde the trough west
between Monday and Tuesday, then eject it across the area on
Wednesday.

The latest amdar soundings from klax indicate a marine layer
depth currently near 2200 feet this morning. The marine layer
depth should continue to deepen up to around 2500-2700 feet later
today. If nam-wrf solutions play out, a marine layer depth closer
to around 3000-3500 feet on Monday morning could develop. With
the instability from trough aloft and the deepening marine layer
taking place, drizzle cannot be ruled out across the area as the
stratus deck lifts and squeezes out some precipitation. Highest
confidence for drizzle remains for areas south of point
conception on the front side of the trough axis and where
orographic effects may aid in development through Monday. Less
confidence exists for Tuesday and Wednesday as models dampen the
marine layer quite a bit. With the trough in place, the marine
layer could remain equally as deep or just slightly less deep.

Pops remain in the forecast for the next several days as isolated
showers and thunderstorms cannot be ruled out across the mountains
and desert. Some negative lifted index values and positive cape
values remain through Tuesday, but the main question will be the
amount of moisture. Some model solutions start dry slotting the
area which could cut-off the moisture supply. For the current
time, a consistent forecast remains as confidence is lower in the
trough's exact movement over the coming days, but future shifts
may need to address this development.

Clouds will likely struggle to clear the next couple of days,
reminiscent of a common may or june weather pattern for southern
california. The best clearing will likely take place at los
angeles county beaches each afternoon and evening where ocean
temperatures are warmest, with areas north and west of point dume
or mugu struggling to clear. With that being said, an earlier
arrival of the stratus clouds should expected the next several
afternoons and evenings.

Long term (wed-sat)
the trough should exit the region on Wednesday night. 500 mb
heights start to rise in the wake of the trough as high pressure
builds. Drier southwest flow aloft should keep a persistent marine
layer in place, but the areal extent may keep in confined mainly
to the coast. A warming trend should develop for late this week
with a thinning marine layer depth in weakening onshore flow.

Model solutions are subtle hinting at the possibility of a return
of monsoonal moisture for late in the week or over the weekend.

Given the pattern setting up, it cannot be ruled out. With much
focus given to the short-term, the forecast keeps low pops for
now.

Aviation 20 1000z.

At 0930z, the marine inversion at klax was based around 2200 feet.

The top of the inversion was 4800 feet with a temperature of 21
degrees celsius.

Overall, moderate confidence in 12z TAF package. MVFR conditions
impacting all coastal valley sites this morning. With deepening
marine inversion, there is a 30% chance of drizzle with ifr cigs
12z-18z from ksba southward. Stratus will dissipate a couple hours
slower than Saturday with the possibility of ksba koxr klax
remaining MVFR through the afternoon. For tonight, all coastal and
valley sites should experience MVFR conditions.

Klax... Moderate confidence in 12z taf. There is a 40% chance that
MVFR CIGS will persist through the afternoon. There is a 20%
chance of drizzle 12z-18z with ifr cigs.

Kbur... Moderate confidence in 12z taf. Dissipation of MVFR cigs
could be as late as 20z. There is a 30% chance of drizzle 12z-18z
with ifr cigs. For tonight, arrival of MVFR CIGS could be 1-2
hours earlier than current 06z forecast.

Marine 20 200 am.

For the outer waters, high confidence in current forecast. Winds
and seas will remain below small craft advisory (sca) levels
through Tuesday. On Wednesday and Thursday, northwest winds will
increase with SCA level winds likely.

For the inner waters, high confidence in current forecast. For the
waters north of point sal, winds and seas will remain below sca
levels through Tuesday. On Wednesday and Thursday, SCA level winds
are likely each afternoon and evening. For the waters south of
point conception, winds and seas are expected to remain below sca
levels through Thursday.

Lox watches warnings advisories
Ca... Beach hazards statement in effect through this evening for
zones 40-41. (see laxcfwlox).

Pz... None.

Hazard potential outlook (tue-sat)
isolated showers and thunderstorms for the mountains and desert
cannot be ruled out for Tuesday.

Public... Hall
aviation... Thompson
marine... Thompson
synopsis... Hall
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OHBC1 - 9410660 - Los Angeles, CA 2 mi48 min 68°F1013.4 hPa
PFXC1 6 mi48 min S 6 G 7 67°F
PSXC1 6 mi48 min S 2.9 G 5.1
46256 6 mi44 min 67°F3 ft
46222 - San Pedro, CA (092) 6 mi36 min 71°F2 ft
PRJC1 7 mi48 min S 5.1 G 6
46253 11 mi36 min 71°F2 ft
46221 - Santa Monica Bay, CA (028) 20 mi36 min 69°F3 ft
ICAC1 - 9410840 - Santa Monica Pier 24 mi54 min NW 1.9 G 2.9 66°F 70°F1013.3 hPa
46025 - Santa Monica Basin - 33NM West Southwest of Santa Monica, CA 40 mi36 min S 1.9 G 5.8 71°F1012.9 hPa (-0.8)

Wind History for Los Angeles Pier 400, CA
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Last
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Long Beach, Long Beach Airport, CA12 mi43 minS 310.00 miOvercast67°F61°F81%1012.9 hPa
Los Alamitos Army Airfield, CA15 mi98 minSSW 310.00 miOvercast67°F60°F80%1013.5 hPa
Hawthorne, Hawthorne Municipal Airport, CA16 mi43 minN 010.00 miOvercast67°F60°F79%1013.1 hPa
Los Angeles, Los Angeles International Airport, CA17 mi43 minSW 410.00 miOvercast67°F62°F84%1012.9 hPa
Fullerton, Fullerton Municipal Airport, CA21 mi43 minSSW 410.00 miOvercast68°F61°F78%1012.5 hPa
Avalon Catalina Airport, CA21 mi45 minN 00.25 miFog59°F59°F100%1012.6 hPa
Los Angeles / USC Campus Downtown, CA22 mi49 minN 010.00 miOvercast68°F60°F76%1012.6 hPa
John Wayne-Orange County Airport, CA23 mi43 minN 010.00 miOvercast68°F60°F76%1012.7 hPa
Santa Monica, Santa Monica Municipal Airport, CA24 mi45 minN 010.00 miOvercast67°F61°F81%1013 hPa

Wind History from TOA (wind in knots)
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Last 24hr--------------------SW4SW4CalmE3NW8NW9NW13NW12NW16W15W13W13W8W6
1 day ago--------------------------W6NW9W12NW14W14NW11W14
G20
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2 days ago--------------------CalmCalmCalmNW3W5W9NW12NW14W13W14W15--NW11--

Tide / Current Tables for Los Angeles (outer harbor), California
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Los Angeles (outer harbor)
Click for Map
Sun -- 03:10 AM PDT     -0.96 feet Low Tide
Sun -- 05:04 AM PDT     Moonrise
Sun -- 06:18 AM PDT     Sunrise
Sun -- 09:32 AM PDT     4.78 feet High Tide
Sun -- 02:49 PM PDT     1.44 feet Low Tide
Sun -- 06:59 PM PDT     Moonset
Sun -- 07:33 PM PDT     Sunset
Sun -- 08:58 PM PDT     6.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.40.7-0.4-0.9-0.70.21.52.944.74.74.23.32.31.61.41.92.94.25.56.46.86.45.2

Tide / Current Tables for Long Beach, Terminal Island, California
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Long Beach
Click for Map
Sun -- 03:10 AM PDT     -0.95 feet Low Tide
Sun -- 05:04 AM PDT     Moonrise
Sun -- 06:18 AM PDT     Sunrise
Sun -- 09:33 AM PDT     4.83 feet High Tide
Sun -- 02:48 PM PDT     1.49 feet Low Tide
Sun -- 06:59 PM PDT     Moonset
Sun -- 07:33 PM PDT     Sunset
Sun -- 08:58 PM PDT     6.88 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.40.8-0.4-0.9-0.70.21.52.94.14.74.84.23.32.41.71.51.92.94.25.66.56.96.55.3

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 (7,2,3,4)
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Ground Weather Radar Station Santa Ana Mtns, 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.