Monday, September25, 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 6:42AMSunset 6:45PM Monday September 25, 2017 3:28 PM PDT (22:28 UTC) Moonrise 11:46AMMoonset 10:30PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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- 201 Pm Pdt Mon Sep 25 2017
Tonight..From point mugu to santa Monica...w winds 10 to 20 kt becoming N to ne 15 to 20 kt with local gusts to 25 kt after midnight. Elsewhere...w winds 15 to 20 kt becoming nw 5 to 10 kt after midnight. Locally choppy seas. Wind waves 2 ft or less. W swell 2 ft at 8 seconds.
Tue..From point mugu to santa Monica...n to ne winds 15 to 20 kt with local gusts to 25 kt. Elsewhere...winds variable 10 kt or less becoming ne 10 to 15 kt in the afternoon. Locally choppy seas. Wind waves 2 ft or less. W swell 2 to 3 ft at 9 seconds.
Tue night..W winds 5 to 10 kt...becoming se 10 to 15 kt after midnight. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 9 seconds and S 2 ft at 12 seconds.
Wed..S winds 5 to 10 kt. Wind waves 2 ft or less. Mixed swell W 2 ft at 10 seconds and S 2 ft at 11 seconds.
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 10 seconds and S 2 ft at 11 seconds.
Thu..Winds variable 10 kt or less...becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. W swell 2 ft at 10 seconds.
Thu night..W winds 10 to 15 kt in the evening...becoming variable 10 kt or less. Wind waves 2 ft or less. W swell 2 ft at 9 seconds.
Fri..W winds 10 to 15 kt. Wind waves 2 ft or less. W swell 2 ft.
Sat..W winds 5 to 10 kt. Wind waves 2 ft or less. W swell 2 to 3 ft.
PZZ600 201 Pm Pdt Mon Sep 25 2017
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 20z...or 1 pm pdt....A 1021 mb surface high was over the great basin, while a 1009 mb thermal trough was along the southern california coast. Light to moderate west to northwest flow aloft will continue across the coastal waters this afternoon and evening, then locally moderate offshore winds will develop nearshore 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 252104
afdlox
area forecast discussion
national weather service los angeles oxnard ca
204 pm pdt Mon sep 25 2017

Synopsis
Gradually strengthening offshore flow will bring a warming and
drying trend with mostly clear skies to the area through this week
and into the weekend. There will be some gusty north to northeast
winds at times over the region, especially below and through
passes and canyons. Temperatures will be a few degrees above
normal for many areas early this week, then increase to much
above normal for late this week and into the weekend.

Short term (tdy-thu)
offshore flow resulted in a decent bump in temperatures area-wide
today but most noticeably for the coast and coastal valleys where
temps were up about 10 degrees on average. Northeast winds picked
up as well but most areas were well below advisory levels.

Gradients and upper support are expected to increase tonight and
Tuesday morning which will lead to a slight increase in santa ana
winds and temperatures. Have opted to not go with wind advisories
at this point though it's likely one or two spots near the
la ventura county line will get a few hours of advisory level
gusts.

On Wednesday gradients and upper support weaken and models show a
little eddy spinning up and pulling in some low level moisture
from the south that could allow some low clouds and fog to creep
up from the south. But even if low clouds do not form coast valley
temps should cool a few degrees and potentially more than what is
currently forecast. Some mixed signals for Thu but likely minimal
change overall. Low level temps are warmer but gradients trend
slightly onshore so those factors likely will cancel each other
out. If low clouds manage to work their way into la county
Wednesday they will likely still be around Thu and forecast highs
will almost certainly be too warm.

Long term (fri-mon)
models are definitely trending away from the ridge pattern through
the weekend and gradients generally trend more onshore each day.

So a few degrees have been trimmed off the forecast highs and more
trimming may be needed if this continues, especially Sunday into
Monday as both the GFS and ECMWF show a pretty strong upper low
moving into the pac NW late in the weekend. Low clouds would
likely return by the weekend as well if models don't flip back
around to a warmer pattern.

Aviation 25 1600z.

At 16z, there was no marine layer at klax.

High confidence inVFR conditions throughout the period.

Moderate-to-high confidence in offshore winds. Periods of moderate
to strong wind shear are possible tonight at mainly terminals
south of point conception.

Klax...VFR conditions are expected throughout the period. There is
a 40 percent chance of moderate wind shear between 00z and 04z. There
is 10 percent chance of east winds greater than 7 knots after
07z.

Kbur...VFR conditions are expected throughout the period. There is
a 50 percent chance of moderate wind shear between 10z and 18z.

Marine 25 200 pm.

Moderate-to-high confidence in the current forecast. Main concern
is winds for the outer waters this evening and across the inner
waters tonight and into Tuesday morning.

Marginal small craft advisory level winds will likely develop
late this afternoon across the northern outer waters and continue
through this evening, otherwise winds and seas will remain below
small craft advisory levels through at least Friday. Winds will
likely increase over the weekend.

For the inner waters, winds and seas are expected to remain below
small craft advisory levels through Friday. There is a 40 percent
chance of small craft advisory north to northeast winds each
night and morning through Thursday across the nearshore waters
from ventura south to santa monica.

Fire weather 25 1130 am.

A long duration of elevated fire danger expected to continue
across portions of southwest california through this upcoming
weekend. Weak to occasionally moderate offshore flow is expected
during this period which will continue to support a prolonged
period of very warm and dry conditions to the region.

In the short term, offshore pressure gradients are expected to
peak today and Tuesday when lax-daggett gradients are expected to
range between -3 and -4 mb each morning. There is the potential
for a slight ramp up in upper level support on Tuesday and
Wednesday as computer models continue to show the potential for a
cutoff low pressure system to develop near the colorado river
valley. Offshore winds are expected to be the strongest across
the mountains today and Tuesday with some weakening for Wednesday
(including the santa monica mountains) when gusts between 30 and
40 mph are expected with local gusts to around 45 mph. Gusts
between 25 and 35 mph are likely for wind prone valley and
interior coastal areas. Offshore flow is expected to be weaker on
Thursday and Friday, then potentially nudge upward again by
Sunday.

This prolonged period of offshore flow will bring widespread
minimum humidities between 10 and 20 percent for areas away from
the coast through next weekend, along with poor overnight
recoveries across the mountains, foothills, and wind exposed
locations. In addition, there will be a prolonged period of very
warm temperatures with highs climbing into the 90s much of this
week in the valleys, and triple digit readings possible Friday
through next weekend. The above mentioned fire weather conditions
combined with fuels becoming critically dry will support this long
duration of elevated fire danger, with an increased risk for
large fires and erratic fire behavior. Brief critical fire weather
conditions are likely for areas with strongest winds today,
Tuesday and possibly Wednesday. Local or brief critical fire
weather conditions may return by Sunday.

Lox watches warnings advisories
Ca... None.

Pz... Small craft advisory in effect until 9 pm pdt this evening
for zones 670-673. (see laxmwwlox).

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

Public... Mw
aviation... Hall
marine... Hall
fire... Munroe gomberg
synopsis... Sweet
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRJC1 2 mi40 min WSW 18 G 19
PSXC1 2 mi40 min SW 13 G 15
PFXC1 2 mi40 min WSW 13 G 16 81°F
BAXC1 3 mi40 min SW 12 G 15
46256 4 mi36 min 67°F2 ft
PFDC1 4 mi40 min SSW 11 G 12
PXAC1 5 mi40 min SW 8.9 G 13
AGXC1 5 mi40 min WSW 9.9 G 12 74°F 1009 hPa
OHBC1 - 9410660 - Los Angeles, CA 6 mi40 min 67°F1008.9 hPa
46222 - San Pedro, CA (092) 12 mi58 min 69°F2 ft
46253 13 mi28 min 69°F1 ft
ICAC1 - 9410840 - Santa Monica Pier 24 mi40 min WSW 9.9 G 11
46221 - Santa Monica Bay, CA (028) 25 mi28 min 70°F2 ft
46262 44 mi28 min 69°F2 ft
46025 - Santa Monica Basin - 33NM West Southwest of Santa Monica, CA 46 mi28 min W 9.7 G 12 1008.7 hPa (-2.0)

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 mi35 minW 1110.00 miFair90°F26°F10%1008.1 hPa
Los Alamitos Army Airfield, CA7 mi30 minWSW 1110.00 miA Few Clouds89°F30°F12%1008.1 hPa
Torrance, Zamperini Field Airport, CA8 mi41 minWNW 1010.00 miPartly Cloudy84°F33°F16%1008.8 hPa
Fullerton, Fullerton Municipal Airport, CA13 mi35 minW 1110.00 miA Few Clouds90°F26°F10%1007.5 hPa
Hawthorne, Hawthorne Municipal Airport, CA14 mi35 minWSW 1110.00 miFair83°F34°F17%1008.7 hPa
Los Angeles, Los Angeles International Airport, CA17 mi35 minW 1110.00 miA Few Clouds81°F42°F25%1008.7 hPa
John Wayne-Orange County Airport, CA17 mi35 minSW 1210.00 miPartly Cloudy83°F37°F19%1008.3 hPa
Los Angeles / USC Campus Downtown, CA19 mi41 minW 810.00 miFair84°F30°F15%1008.2 hPa
Santa Monica, Santa Monica Municipal Airport, CA24 mi37 minSW 10 G 1510.00 miFair81°F34°F18%1008.7 hPa
El Monte, CA24 mi43 minS 11 G 1610.00 miFair90°F26°F10%1008.8 hPa

Wind History from LGB (wind in knots)
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Last 24hrS8NW11W13W11W6N4S3CalmCalmCalmNW3CalmW3NW3NW3CalmNW3CalmCalmCalmCalmSW7SW9W11
1 day agoS8W10W11W6NW3CalmCalmCalmCalmCalmNE3CalmCalmCalmCalmCalmCalmN3N4NE3E3S7S9S8
2 days agoSW8SW9NW13NW11NW9W6W4W4CalmCalmCalmCalmCalmCalmCalm--CalmSE4Calm3SW8S85S10

Tide / Current Tables for Long Beach, Outer Harbor, Pier A, California
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Long Beach
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Mon -- 01:20 AM PDT     3.54 feet High Tide
Mon -- 06:29 AM PDT     2.31 feet Low Tide
Mon -- 06:43 AM PDT     Sunrise
Mon -- 11:45 AM PDT     Moonrise
Mon -- 12:49 PM PDT     4.63 feet High Tide
Mon -- 06:44 PM PDT     Sunset
Mon -- 08:15 PM PDT     1.33 feet Low Tide
Mon -- 10:30 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.33.53.53.22.92.52.32.32.63.13.64.24.54.64.443.32.621.51.31.41.72.1

Tide / Current Tables for Los Angeles, California
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Los Angeles
Click for Map
Mon -- 01:16 AM PDT     3.69 feet High Tide
Mon -- 06:21 AM PDT     2.40 feet Low Tide
Mon -- 06:43 AM PDT     Sunrise
Mon -- 11:46 AM PDT     Moonrise
Mon -- 12:46 PM PDT     4.82 feet High Tide
Mon -- 06:45 PM PDT     Sunset
Mon -- 08:07 PM PDT     1.39 feet Low Tide
Mon -- 10:31 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.53.73.63.432.62.42.52.83.23.84.44.74.84.64.13.42.721.61.41.51.82.2

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 (18,4,5,8)
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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.