Friday, October20, 2017 L-36.com


Marine Weather and Tides
Rossmoor, 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 7:00AMSunset 6:12PM Friday October 20, 2017 11:06 AM PDT (18:06 UTC) Moonrise 7:45AMMoonset 7:10PM Illumination 0% Phase: New Moon; Moon at 0 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- 859 Am Pdt Fri Oct 20 2017
.small craft advisory in effect through late tonight...
Today..NW winds 15 to 25 kt in the afternoon. Local gusts to 35 kt. Strongest western portion. Combined seas 6 to 8 ft dominant period 7 seconds. Slight chance of showers in the morning.
Tonight..Western portion, nw winds 20 to 30 kt with local gusts to 35 kt becoming 10 to 15 kt after midnight. Elsewhere, nw winds 15 to 25 kt becoming N 10 to 15 kt with gusts to 20 kt after midnight. Combined seas 6 to 8 ft dominant period 8 seconds, subsiding to 4 to 6 ft dominant period 9 seconds after midnight.
Sat..N to ne winds 10 to 15 kt. Local gusts to 25 kt between point mugu and santa Monica. Wind waves 1 to 3 ft. W swell 3 to 5 ft at 15 seconds.
Sat night..NW winds 10 to 15 kt, becoming N to ne 5 to 10 kt after midnight. Wind waves 1 to 3 ft. W swell 3 to 4 ft at 14 seconds.
Sun..N to ne 5 to 15 kt, becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. W swell 3 ft at 13 seconds. S swell 2 ft.
Sun night..W winds 10 to 15 kt, becoming ne 5 to 15 kt after midnight. Wind waves 2 ft or less. Mixed swell W 3 ft at 13 seconds and S 2 ft at 18 seconds.
Mon..From point mugu to santa Monica, ne winds 15 to 20 kt with gusts to 25 kt, becoming nw to N 10 to 15 kt by late afternoon. Elsewhere, ne winds 5 to 10 kt, becoming nw 10 to 15 kt in the afternoon. Combined seas 3 to 5 ft.
Tue..From point mugu to santa Monica, ne winds 15 to 20 kt with gusts to 25 kt, becoming nw to N 10 to 15 kt by late afternoon. Elsewhere, ne winds 5 to 10 kt, becoming nw 10 to 15 kt in the afternoon. Combined seas 3 to 4 ft.
PZZ600 859 Am Pdt Fri Oct 20 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...a 990 mb low was located over northern Montana with a weak cold front extending into central california. Gale force winds are likely behind the front across the outer water late this afternoon through tonight.

7 Day Forecast for Marine Location Near Rossmoor, CA
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location: 33.79, -118.07     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 201716
afdlox
area forecast discussion
national weather service los angeles oxnard ca
1016 am pdt Fri oct 20 2017

Synopsis
A weak cold front moving over the region this morning will bring
a mix of clouds, gusty winds, and a showery weather pattern to the
area. Offshore wind will develop by Saturday behind the trough.

Very hot temperatures are expected for early next week as a santa
ana develops. Record heat is possible for Monday and Tuesday.

Short term (tdy-sun)
main updates to adjust cloud cover and placement of showers
today. An upper level trough axis has moved across southwest
california this morning bringing cooler air into the region and
some upslope rain showers across the santa lucia mtns and san
gabriel mtns. Increased west to northwest winds will bring gusty
conditions throughout the area today. Already seeing west wind
gusts topping 40 mph in the antelope valley and blowing dust near
lancaster this morning. Satellite confirms mountain wave clouds in
the area as well. Temperatures are running a good 10-15 degrees
cooler in the mountains due to this air mass change and cloud
cover, so the theme today will be cool and breezy compared to
recent days. Have confined most shower threat for the remainder of
today across the mountains where gauges continue to record a few
hundredths each hour or two.

Winds will be the trickiest part of the forecast in the next
24-hours followed by the building heat wave over the weekend.

Strongest advisory level winds anticipated across the mountains
from santa barbara county eastward to los angeles county. Winds
transition to northeast by Saturday morning then we will be in a
classic santa ana wind pattern for several days with near record-
breaking heat expected early next week from the foothills to the
ocean.

Long term (mon-thu)
a significant warming trend is forecast for Monday and Tuesday as
offshore pressure gradients peak across the area. Offshore flow
will combine with strong high pressure aloft to bring a mix of gusty
santa ana winds, record hot conditions, and dry conditions to the
area. Heat risk will be on the rise for early next week as record
hot temperatures develop. The forecast continues to take a warmer
than guidance stance as model output statistic trend toward
climatology in the long term portions of the forecast. Surface
gradients and compressional heating will likely win out to bring
record level heat to the region. 06z nam-wrf solutions back up
this idea with the thermal surface trough deepening on Monday. An
excessive heat watch remains in place for early next week.

Advisory level winds could also be the mix for Monday, which
could make the coast much hotter than the current forecast and the
valleys somewhat cooler than the current forecast.

Offshore flow starts to weaken and high pressure starts to break
down on Wednesday. Model solutions continue to disagree on when
more pronounced cooling will arrive to the area. GFS solutions
tend to want to delay a weak cold front moving south until Friday,
while ECMWF solutions are much more progressive with it, pushing
it into the area on Thursday. The forecast trends more toward the
idea of the GFS hanging on to the ridge a little longer.

Aviation 20 1145z...

at 1130z, the marine inversion at klax was based at 3700 feet. The
top of the inversion was 6800 feet with a temperature of 12
degrees celsius.

Overall, moderate confidence in 12z TAF package. Deep moist layer
and dying cold front will generate MVFR toVFR CIGS across the
area with the central coast and interior coastal plain and valleys
of ventura la counties the most likely to experience CIGS this
morning. Clouds should dissipate by late morning withVFR
conditions for all areas this afternoon and tonight. Main issue
this afternoon and evening will be gusty west to northwest winds.

Klax... Moderate confidence in 12z taf. There is a 30% chance of
MVFR CIGS 12z-16z. West winds, gusting to 30 kt, will be likely
this afternoon and early evening.

Kbur... Moderate confidence in 12z taf. Dissipation of MVFR cigs
could be delayed until 16z or 17z. There is a 30% chance of llws
and turbulence after 03z.

Marine 20 915 am...

for the outer waters, high confidence in current forecast. Small
craft advisory (sca) level winds this morning will increase to
gale force levels this afternoon through tonight. The winds will
diminish on Saturday, but remain at SCA levels through Monday.

For the inner waters, moderate confidence in the current
forecast. For the waters north of point sal, winds are expected to
increase to gale force levels this afternoon through tonight. On
Saturday, the winds will diminish, but SCA level winds are
anticipated through Sunday. For the waters south of point
conception, SCA level winds are expected through tonight with the
strongest winds across western sections and a 30% chance of gale
force gusts across the western santa barbara channel. From Sunday
night through Tuesday, there is a 50% chance of SCA level
northeasterly winds nearshore from ventura southward.

A large long-period NW swell will move into our waters Friday and
persist through the weekend. Seas up to 15 feet are likely across
the outer and northern waters. There will likely be dangerous
breaking waves on the central coast through the weekend with
dangerous conditions in near harbors. South of point
conception... The westerly swell will contribute to continued
hazardous conditions at the beaches through this weekend.

Beaches 20 200 am...

central coast... A significant storm system in the gulf of alaska
has caused large swells to develop. These large northwest swells
will approach the central coast by this morning. A high surf
advisory has been issued valid for the central coast from this
morning through Sunday morning. Surf will quickly rise to around
10 to 12 feet initially this morning. By this evening through
early Saturday, surf should increase to between 14 and 20 feet.

Surf will then begin to lower through Saturday afternoon into
Sunday morning, but remain above 10 feet. Some impacts from these
large and powerful waves and strong currents would be the risk of
ocean drowning. Also sneaker waves can suddenly overrun previously
dry beaches and jetties. With surf approaching 20 feet, some low
lying beach parking lots, harbor walkways and campgrounds could
see local coastal flooding during the peak of the highest surf.

South of point conception... The large northwest swell forecast to
bring very large surf to the central coast should filter some of
the energy into the southern california bight allowing for higher
surf potential by this weekend. Confidence is high with respect to
elevated surf (3 to 6 feet with local sets to 8 feet) and
dangerous rip currents. So, the beach hazards statement has been
extended through Sunday afternoon.

Fire weather 20 1015 am.

A weakening cold front will bring isolated showers and drizzle to
portions of southwest california this morning. The main impact will
be increasing northwest to north winds behind the front which
will bring elevated fire danger to many areas today through
tonight. The strongest winds today through tonight will be focused
across the mountains, antelope valley, central coast, and santa
barbara county south coast where gusts between 40 and 55 mph will
be common. Humidites are not expected to be sufficiently low
during this time to warrant any red flag warnings, however a
drying trend will beginning to occur across downslope portions of
the mountains overnight.

Northerly flow on Saturday and Saturday night is expected to bring a
warming and drying trend along with elevated fire danger to the
region. The strongest winds during this period will remain focused
across the mountains, especially the interstate 5 corridor and
santa ynez mountains where gusts between 40 and 50 mph can be
expected. A fire weather watch is in effect for the mountains
beginning Saturday morning and will likely be converted to a red
flag warning later today.

From Sunday through Tuesday, there is the potential for a
prolonged duration of gusty santa ana winds with hot and very dry
conditions. The strongest santa ana winds during this period is
expected to be Monday through Tuesday when gusts between 40 and 50
mph will be possible across wind prone passes and canyons of los
angeles and ventura counties. Record breaking triple digit heat
and humidities lowering into the single digits and lower teens
will be possible during this time. In addition, very warm and dry
conditions during the overnight hours in the mountains, foothills,
and wind prone areas will add to this fire weather threat during
this long duration of dangerous fire weather conditions. A fire
weather watch is in effect for all mountain and valley areas of
los angeles and ventura counties Sunday through Tuesday, and may
need to be expanded into coastal areas as we draw closer to the
event.

Lox watches warnings advisories
Ca... High surf advisory in effect until noon pdt Sunday for zones
34-35. (see laxcfwlox).

Wind advisory in effect until 10 pm pdt this evening for
zones 34-35-40-59-88. (see laxnpwlox).

Wind advisory in effect until 3 am pdt Saturday for zones
39-52>54. (see laxnpwlox).

Excessive heat watch in effect from Monday morning through
Tuesday evening for zones 39>41-44>46-88-547. (see laxnpwlox).

Beach hazards statement in effect through Sunday afternoon
for zones 40-41. (see laxcfwlox).

Fire weather watch in effect from Sunday morning through
Tuesday afternoon for zones 244>246-288-547-548. (see laxrfwlox).

Fire weather watch in effect from Saturday morning through
Sunday morning for zone 252. (see laxrfwlox).

Fire weather watch in effect from Saturday morning through
Tuesday afternoon for zones 253-254. (see laxrfwlox).

Pz... Gale warning in effect from 3 pm this afternoon to 9 pm pdt
this evening for zone 645. (see laxmwwlox).

Small craft advisory in effect until 4 am pdt Saturday for
zones 650-655. (see laxmwwlox).

Small craft advisory in effect until 3 pm pdt this afternoon
for zones 670-673-676. (see laxmwwlox).

Gale warning in effect from 3 pm this afternoon to 3 am pdt
Saturday for zones 670-673-676. (see laxmwwlox).

Hazard potential outlook (sun-thu)
hot temperatures and elevated fire weather conditions are
expected into early next week as another santa ana develops.

Record heat is possible for Monday and Tuesday. High surf and
strong rip currents will linger along central coast beaches
Sunday.

Public... Boldt hall
aviation... Rat
marine... Rm rat
beaches... Rat
fire... Gomberg
synopsis... Jld
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRJC1 7 mi49 min WNW 8.9 G 13
PFXC1 8 mi49 min WNW 16 G 18 68°F
PSXC1 8 mi49 min WNW 15 G 19
BAXC1 9 mi49 min NW 13 G 17
46256 9 mi45 min 67°F5 ft
PFDC1 10 mi49 min W 9.9 G 12
PXAC1 10 mi49 min NW 11 G 15
AGXC1 11 mi49 min WSW 8.9 G 11 67°F 1014.1 hPa
OHBC1 - 9410660 - Los Angeles, CA 12 mi49 min 67°F1014 hPa
46253 16 mi67 min 69°F6 ft
46222 - San Pedro, CA (092) 18 mi37 min 68°F7 ft
ICAC1 - 9410840 - Santa Monica Pier 27 mi55 min WSW 7 G 8.9 65°F 68°F1013.9 hPa
46221 - Santa Monica Bay, CA (028) 30 mi37 min 66°F6 ft

Wind History for Los Angeles Pier J, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Los Alamitos Army Airfield, CA1 mi69 minW 710.00 miPartly Cloudy70°F57°F63%1013.8 hPa
Long Beach, Long Beach Airport, CA5 mi74 minWNW 1310.00 miFair68°F57°F70%1013.5 hPa
Fullerton, Fullerton Municipal Airport, CA7 mi74 minSW 410.00 miPartly Cloudy68°F57°F70%1013.5 hPa
John Wayne-Orange County Airport, CA13 mi74 minSW 810.00 miMostly Cloudy68°F57°F68%1013.8 hPa
Torrance, Zamperini Field Airport, CA14 mi79 minW 19 G 2410.00 miPartly Cloudy and Breezy66°F57°F73%1013.5 hPa
Hawthorne, Hawthorne Municipal Airport, CA17 mi74 minW 710.00 miFair68°F55°F65%1013.5 hPa
Los Angeles / USC Campus Downtown, CA19 mi80 minVar 310.00 miPartly Cloudy70°F59°F68%1013 hPa
Los Angeles, Los Angeles International Airport, CA20 mi74 minW 99.00 miPartly Cloudy68°F57°F68%1013.5 hPa
El Monte, CA21 mi76 minno data8.00 miMostly Cloudy66°F59°F78%1014.2 hPa

Wind History from SLI (wind in knots)
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Last 24hrCalmSW8S7SW9S10SW9SW7S7S5S5S5SE3SE3CalmSE4SE5E4W8W3W8W7W4W9W7
1 day agoCalmSW9S8SW9S7S7S5S6S7S5SE3SE3CalmCalmCalmCalmCalmCalmCalmE6E4E4SE4Calm
2 days agoCalmS3SW9SW9W6W8S6S4CalmCalmCalmCalmSE4SE3SE3CalmE3E3CalmCalmCalmCalmSE5SE6

Tide / Current Tables for Los Patos (highway bridge), California
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Los Patos (highway bridge)
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Fri -- 04:56 AM PDT     0.71 feet Low Tide
Fri -- 07:01 AM PDT     Sunrise
Fri -- 07:44 AM PDT     Moonrise
Fri -- 10:55 AM PDT     4.90 feet High Tide
Fri -- 05:44 PM PDT     0.08 feet Low Tide
Fri -- 06:11 PM PDT     Sunset
Fri -- 07:10 PM PDT     Moonset
Fri -- 11:41 PM PDT     3.82 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.93.22.41.50.90.711.82.83.94.74.94.63.92.81.70.80.20.10.51.32.33.23.7

Tide / Current Tables for Long Beach, Inner Harbor, California
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Long Beach
Click for Map
Fri -- 03:51 AM PDT     1.08 feet Low Tide
Fri -- 07:02 AM PDT     Sunrise
Fri -- 07:45 AM PDT     Moonrise
Fri -- 10:00 AM PDT     5.64 feet High Tide
Fri -- 04:37 PM PDT     0.13 feet Low Tide
Fri -- 06:12 PM PDT     Sunset
Fri -- 07:11 PM PDT     Moonset
Fri -- 10:46 PM PDT     4.40 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.82.91.91.31.11.42.33.44.55.35.65.34.53.320.90.20.20.71.62.73.64.34.4

Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
west_satellite

GOES Local Image of Southwest    EDIT
Geos

Wind Forecast for Los Angeles/Oxnard, CA (14,3,4,5)
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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.