Monday, July24, 2017 L-36.com


Marine Weather and Tides
Signal Hill, 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 5:58AMSunset 7:59PM Monday July 24, 2017 1:51 PM PDT (20:51 UTC) Moonrise 7:24AMMoonset 9:09PM Illumination 2% 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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PZZ655 Inner Waters From Point Mugu To San Mateo Pt. Ca Including Santa Catalina And Anacapa Islands- 853 Am Pdt Mon Jul 24 2017
Today..Winds variable 10 kt or less...becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 3 ft at 9 seconds and S 2 ft at 12 seconds. Patchy fog in the morning. Slight chance of Thunderstorms in the afternoon.
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 3 ft at 10 seconds and S 2 ft at 12 seconds. Slight chance of Thunderstorms in the evening.
Tue..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 to 3 ft at 9 seconds and S 2 ft at 12 seconds.
Tue night..SW 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 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 at 9 seconds and S 2 ft at 12 seconds. Patchy fog in the morning.
Wed 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 9 seconds and S 2 ft at 12 seconds. Patchy fog after midnight.
Thu..W winds 10 to 15 kt. Wind waves 2 ft or less. Mixed swell W 2 ft and S 2 ft. Patchy fog.
Fri..W winds 10 to 15 kt. Wind waves 2 ft or less. SE swell 3 to 5 ft. Patchy fog.
PZZ600 853 Am Pdt Mon Jul 24 2017
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 15z...or 8 am pdt...1031 mb surface high pressure was centered 600 nm miles west of portland oregon. A 1006 mb thermal low was centered over southern nevada. There is a slight chance of Thunderstorms this afternoon and evening south of point conception.

7 Day Forecast for Marine Location Near Signal Hill, CA
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location: 33.76, -118.18     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 241833
afdlox
area forecast discussion
national weather service los angeles oxnard ca
1133 am pdt Mon jul 24 2017

Synopsis
A push of monsoonal moisture may bring isolated showers and
thunderstorms, mainly across interior areas, through Wednesday.

Increased cloud coverage may bring additional cooling for many
areas before a gradual warming trend takes hold later this week.

Hot and humid conditions are possible next weekend.

Short term (tdy-wed)
immediate concern today is with the forecast chances of showers
and thunderstorms across the mountains, valleys, and waters south
of point conception this morning, and moving to areas north of
point conception this afternoon and this evening. Current radar
has indicated a ne-sw oriented band of showers and thunderstorms
moving northwest from offshore san diego then northeast into the
big bear area. There was much more lightning activity earlier
this morning with this band, but much of the activity is gone
now. Difficult to find any kicker in the models, although this
area sure has the look of some kicker moving northwest.

Precipitable water values per gps met pw sites showing values of
around 1.75 inches to our south then drying out to around 1.25
inches over la and vtu counties, the hourly trends showing values
to flatten a bit. Instability parameters are not that impressive
over the forecast area for this afternoon. The only notable cape
in the NAM is over the ventura-sba-slo mountains this afternoon
and even at that is only around 200 j kg, and with very minimal
lifted indicies just barely negaative. High res models such as
the hrrr indicate that this activity weakens and is shifted to the
northeast as the 850-300 mb upper flow becomes more
southwesterly, although the hrrr strugles with weakly forced
precipitation.

So although not impressed with currently forecast shower and
thunderstorm chances for this afternoon given all the guidance
pointing to a downward trend as well as current lack of lightning
from this area, will need to leave chances in for the time being
since models may be missing the kicker that helped the activity to
our south and enough of the activity still holding together.

Will, however, remove chances for the valley to coastal areas
north of point conception for this afternoon, leaving chances only
in the sba-slo county mountains. Will also likely later pull out
any chances of trw for valleys and coastal waters this evening and
just leave chances in the mountains and antelope valley.

One thing that's more certain is the increase in cloud cover
through the day. Won't be a solid cover and expect breaks now and
then. Temps should be cooler while with higher humidity it won't
feel that much cooler than yesterday.

Upper flow stays southwesterly Tue and Wed and the area is just on
the edge of the high pw levels to our east. Precip chances should
be restricted to the antelope valley and mountains of la and vtu
counties, the better chances in the eastern san gabriels and
eastern antelope valley. Similar story for Wednesday although
chances should be less than tue.

Long term (thu-sun)
overall, 00z models exhibit decent synoptic agreement through
Saturday then start to diverge on Sunday. At upper levels, center
of the ridge will gradually work its way back west to meander
around the four corners area with models differing on exact
location through the weekend. Near the surface, onshore flow will
continue through the period with the models handling what will be
hurricane hilary.

Forecast-wise, Thursday and Friday will be rather quiet days with
stratus impacting the coastal plain each night morning, but mostly
clear skies otherwise. With h5 heights gradually increasing
temperatures will continue to exhibit a warming trend with
temperatures a few degrees above seasonal normals.

For Saturday Sunday, things start to get potentially more
interesting. Models indicate southeasterly flow developing over
the area which should be able to entrain moisture from hurricane
hilary. Based on current solutions, ECMWF has more realistic
handling of the track of hilary than the gfs. Latest forecast
track from NHC supports this thought. So, will lean forecast
towards ECMWF which supports partly cloudy skies for Saturday and
Sunday with potentially enough moisture instability to generate
some thunderstorms over the mountains and deserts on Sunday. Of
course if the GFS is closer to reality, there could be greater
chances of thunderstorms on Sunday and even Saturday. As for
temperatures, potential cloud cover could inhibit temperatures on
Saturday Sunday. However, the increasing relative humidity would
counteract that, resulting in conditions feeling just as warm.

Aviation 24 1800z.

At 1625z at klax... The marine layer depth was 1400 feet. The top
of the inversion was around 4600 feet with a temperature of about
23 degrees celsius.

There is only low confidence in the 18z TAF package. An extensive
area of mid level clouds has moved across the southern half of
the forecast area. There is now considerable doubt about the
return of marine clouds tonight for the southern half of the
forecast area. Therefore, the onset time of marine clouds for the
south coastal sections has been pushed back several hours.

North of point conception, there is little change and better
confidence in the anticipated onset of marine clouds for the
coastal sections.

There is a slight chance of thunderstorms this afternoon and
evening especially in the mountains and in the antelope valley.

Klax... Low confidence in the 18z taf. There is a 50 percent
chance of the marine clouds arriving plus or minus two or more
hours from the forecasted time. There is a 30 percent chance of
vfr conditions persisting through the night.

Kbur... Moderate confidence in the 18z taf. There is a 20 percent
chance of showers and thunderstorms through this evening.

Marine 24 900 am...

wind and sea conditions will remain below small craft advisory
(sca) levels through Thursday. There is a slight chance of
thunderstorms this afternoon and evening across the coastal
waters.

Beaches 24 0900 am.

Significant surf conditions may impact the southern california
beaches late this week as tropical storm hilary strengthens to a
major hurricane off the mexican coast during the week. A
southeasterly swell will likely be generated and push into the
coastal waters beginning Thursday night or Friday and peaking over
the weekend. This swell would generate high surf and strong rip
currents on south facing beaches. Damaging sets of surf and beach
erosion cannot be ruled out for south facing los angeles and
ventura county beaches.

Lox watches warnings advisories
Ca... None.

Pz... None.

Hazard potential outlook (wed-sun)
a significant surf event could develop as early as late Thursday as
swells from forecasted major hurricane hilary arrive at southern
california beaches. High surf and strong rip currents will likely
peak over the weekend.

Moisture from hurricane hilary could be entrained across the area
next weekend, bringing the potential for mountain and desert
thunderstorms.

Public... Jackson thompson
aviation... Sweet
marine... Sweet
beaches... Sweet
synopsis... Jld
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRJC1 2 mi52 min SW 9.9 G 11
PSXC1 2 mi52 min SSW 8.9 G 12
PFXC1 2 mi52 min SW 9.9 G 11 74°F
BAXC1 3 mi52 min SSW 12 G 15
46256 4 mi60 min 72°F2 ft
PFDC1 4 mi52 min S 4.1 G 6
AGXC1 5 mi52 min SSW 8.9 G 11 71°F 1013.3 hPa (-0.9)
PXAC1 5 mi52 min SSW 8.9 G 11
OHBC1 - 9410660 - Los Angeles, CA 6 mi52 min 68°F1013.4 hPa (-0.9)
46222 - San Pedro, CA (092) 12 mi52 min 72°F2 ft
46253 13 mi52 min 71°F2 ft
ICAC1 - 9410840 - Santa Monica Pier 24 mi52 min SW 9.9 G 11 69°F 74°F1013.4 hPa (-0.7)
46221 - Santa Monica Bay, CA (028) 25 mi52 min 73°F2 ft
46025 - Santa Monica Basin - 33NM West Southwest of Santa Monica, CA 46 mi42 min SW 5.8 G 7.8 72°F1013 hPa

Wind History for Los Angeles Pier S, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Long Beach, Long Beach Airport, CA5 mi59 minSSW 810.00 miFair75°F64°F69%1012.8 hPa
Los Alamitos Army Airfield, CA7 mi1.9 hrsSSW 77.00 miMostly Cloudy74°F64°F74%1013.5 hPa
Torrance, Zamperini Field Airport, CA8 mi65 minSE 810.00 miMostly Cloudy77°F64°F65%1012.9 hPa
Fullerton, Fullerton Municipal Airport, CA13 mi59 minVar 610.00 miFair76°F64°F69%1012.4 hPa
Hawthorne, Hawthorne Municipal Airport, CA14 mi59 minWSW 1010.00 miFair77°F64°F66%1012.8 hPa
Los Angeles, Los Angeles International Airport, CA17 mi59 minW 128.00 miMostly Cloudy76°F64°F69%1012.9 hPa
John Wayne-Orange County Airport, CA17 mi59 minSW 610.00 miMostly Cloudy74°F64°F74%1012.8 hPa
Los Angeles / USC Campus Downtown, CA19 mi65 minVar 310.00 miFair81°F64°F57%1012.2 hPa
Santa Monica, Santa Monica Municipal Airport, CA24 mi61 minWSW 810.00 miFair75°F64°F71%1013 hPa
El Monte, CA24 mi62 minno data10.00 miFair82°F60°F48%1013.2 hPa

Wind History from LGB (wind in knots)
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Last 24hrS7S7S7SW4W4NW9NW6S5SE7SW3CalmSE4SE4CalmS3S34CalmCalmSW3S44S7S8
1 day agoS7S10S7SE10S6SE7NW5NW5CalmS4S4S3S3SE4S3CalmCalmCalmCalmCalmSW5S96SW7
2 days agoS9S9S7NW9W6NW9W8NW6NW5NW3CalmS3S5S3S3CalmCalmCalmS4E3--CalmS8SW10

Tide / Current Tables for Long Beach, Outer Harbor, Pier A, California
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Long Beach
Click for Map
Mon -- 05:03 AM PDT     -1.22 feet Low Tide
Mon -- 05:59 AM PDT     Sunrise
Mon -- 07:24 AM PDT     Moonrise
Mon -- 11:24 AM PDT     4.54 feet High Tide
Mon -- 04:39 PM PDT     1.59 feet Low Tide
Mon -- 07:58 PM PDT     Sunset
Mon -- 09:09 PM PDT     Moonset
Mon -- 10:42 PM PDT     6.37 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.23.61.90.3-0.8-1.2-0.90.11.52.83.94.54.43.93.12.31.71.62.13.14.35.46.26.3

Tide / Current Tables for Los Angeles, California
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Los Angeles
Click for Map
Mon -- 04:55 AM PDT     -1.27 feet Low Tide
Mon -- 05:59 AM PDT     Sunrise
Mon -- 07:24 AM PDT     Moonrise
Mon -- 11:21 AM PDT     4.73 feet High Tide
Mon -- 04:31 PM PDT     1.66 feet Low Tide
Mon -- 07:59 PM PDT     Sunset
Mon -- 09:09 PM PDT     Moonset
Mon -- 10:39 PM PDT     6.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.33.61.80.2-0.9-1.3-0.80.21.73.14.24.74.643.12.31.71.72.33.34.65.76.56.6

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 (16,3,4,5)
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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.