Saturday, April29, 2017 L-36.com


Marine Weather and Tides
South Monrovia Island, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:01AMSunset 7:36PM Saturday April 29, 2017 10:38 AM PDT (17:38 UTC) Moonrise 9:03AMMoonset 11:24PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 905 Am Pdt Sat Apr 29 2017
.small craft advisory in effect through this evening...
Today..NE winds 15 to 25 kt...becoming W in the afternoon. Combined seas 4 to 6 ft dominant period 10 seconds.
Tonight..W winds 15 to 25 kt...becoming nw 5 to 10 kt after midnight. Combined seas 4 to 5 ft dominant period 11 seconds.
Sun..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 11 seconds and S 2 ft at 18 seconds.
Sun 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 3 ft at 9 seconds and sw 2 ft at 17 seconds. Patchy fog after midnight.
Mon..Winds variable 10 kt or less...becoming sw 10 kt in the afternoon. Wind waves 2 ft or less. W swell 3 to 4 ft at 9 seconds. Patchy fog in the morning.
Mon night..SW winds 10 kt in the evening...becoming variable 10 kt or less. Wind waves 2 ft or less. W swell 3 to 4 ft at 9 seconds. Patchy fog after midnight.
Tue..S winds 5 to 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft. Patchy fog.
Wed..SW winds 5 to 10 kt. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft and S 2 ft. Patchy fog.
PZZ600 905 Am Pdt Sat Apr 29 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 1025 mb surface high was over nevada and will weaken by this evening. Meanwhile a 1030 mb surface high was centered 800 nm northwest of point conception and will change little through at least Tuesday.

7 Day Forecast for Marine Location Near South Monrovia Island, CA
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location: 34.14, -118     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 291543
afdlox
area forecast discussion
national weather service los angeles/oxnard ca
843 am pdt Sat apr 29 2017

Synopsis
Gusty offshore winds and continued warming west of the mountains
can be expected through today. A transition to onshore flow will
bring cooler conditions to the coast but some locations will warm
across interior areas as high pressure builds overhead through at
least early next week.

Short term (tdy-mon)
overall, forecast looks pretty good in the short term with main
focus being the offshore winds today.

Latest surface observations indicate moderate santa ana across the
area with northeast wind gusts between 35 and 55 mph across much
of ventura and los angeles counties (with even some isolated gusts
around 65 mph in some mountain spots). These winds are expected to
peak later this morning then weaken during the afternoon. Current
wind advisories valid until 200 pm which looks good at this time.

Otherwise... Secondary issue for today will be the temperatures.

With high pressure aloft and the offshore flow near the surface,
today will be a very warm day with afternoon temperatures in the
mid 80s to mid 90s across the coasts/valleys of ventura/la
counties and in the 70s to lower 80s across the central coast.

Given current 24 hour temperature trends, these forecast
temperatures look on track at this time.

For the rest of the short term, quick look at initial 12z model
data indicates no significant changes to previous forecast
thinking. Offshore flow will be much weaker tonight and Sunday
morning, before shifting to onshore Sunday afternoon. So, will
expect skies to remain clear through Sunday due to the weak
offshore flow tonight/Sunday morning. As for temperatures, the
onshore flow will cool off the coasts/valleys on Sunday, but
interior sections will actually warm a few degrees.

For Sunday night and Monday, onshore flow will continue across the
district. So, will expect a little more cooling for the coasts and
valleys on Monday, but little change across interior sections. As
for skies, mostly clear skies are expected through Monday for most
areas. Only exception will be across the southern coastal waters
and la coastal plain where a weak eddy is still forecast which
should allow for the return of some stratus/fog (although
confidence in a Monday morning return of stratus is moderate at
best).

Overall, current forecast looks good in the short term. So, no
updates are anticipated.

Long term (tue-fri)
the ec and the GFS agree well on the forecast through Wednesday.

Both forecast a weak east pac ridge to set up just off the state.

Both forecast week offshore flow from the north and weak onshore
flow to the east. There will likely be some night through morning
low clouds and fog across the la coast. MAX temps will continue
above normal ESP from the vlys and inland.

The ec breaks the ridge down quicker than the GFS starting
Thursday. It also forecasts much stronger onshore flow. If it
turns out to be correct MAX temps will be much cooler than the gfs
or the forecast. Will have to keep an eye on this and see which
mdl trends to the other.

Aviation 29/12z
at 09z at klax... There was a surface based inversion with a top around
400 feet. The temperature of the top of the inversion was about
twenty three degrees celsius.

Overall... High confidence in the current tafs.VFR
conditions will prevail throughout the forecast period. Periods of
low level as well as vertical wind shear will be possible...

especially for ventura and los angeles county terminals.

Klax... High confidence in the current taf.VFR conditions will
prevail throughout the forecast period. Periods of low level as
well as vertical wind shear will be possible. There is a fifteen
percent chance that east winds could exceed 7 knots this morning
and a less than ten percent chance that it would exceed 10 knots.

Kbur... High confidence in the current taf.VFR conditions will
prevail throughout the forecast period. Periods of low level as
well as vertical wind shear will be possible.

Marine 29/830 am.

Moderate confidence in low-end small craft advisory (sca)
conditions for northeast winds will continue through this morning
from ventura to santa monica, as well as the waters off of orange
county. Avalon harbor may see an hour of two with gusts around 15
kt. Those winds will then abruptly shift to westerly this
afternoon and remain gusty through this evening. Otherwise sca
conditions will pick up off the outer waters later this afternoon
and evening, then persist through much of next week. The SCA will
likely be extended each day.

Due to the gusty winds... Choppy seas should be expected in most
areas (including near shore) into next week.

Lox watches/warnings/advisories
Ca... Wind advisory in effect until 2 pm pdt this afternoon for
zones 40-41-44>46-53-54-88-547. (see laxnpwlox).

Pz... Small craft advisory in effect until midnight pdt tonight for
zones 650-655. (see laxmwwlox).

Small craft advisory in effect until 3 am pdt Monday for
zones 670-673-676. (see laxmwwlox).

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

Public... Rat/rorke
aviation... Kj
marine... Kittell
synopsis... Sweet
weather.Gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSXC1 28 mi51 min NE 5.1 G 8.9
ICAC1 - 9410840 - Santa Monica Pier 28 mi57 min SE 6 G 8.9 67°F 52°F1016.2 hPa
PFXC1 29 mi51 min NE 2.9 G 8 78°F
BAXC1 29 mi51 min ENE 7 G 12
PRJC1 30 mi51 min ENE 13 G 20
PXAC1 30 mi57 min E 5.1 G 7
PFDC1 31 mi51 min NE 9.9 G 12
OHBC1 - 9410660 - Los Angeles, CA 32 mi51 min 60°F1016.1 hPa
46256 32 mi47 min 58°F3 ft
AGXC1 32 mi51 min NE 11 G 12 72°F 1016 hPa
46221 - Santa Monica Bay, CA (028) 39 mi39 min 57°F4 ft
46222 - San Pedro, CA (092) 40 mi50 min 57°F5 ft
46253 40 mi39 min 56°F4 ft

Wind History for Los Angeles Pier S, CA
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S6
G11
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G16
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G30
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G29
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G25
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G24
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SE7
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G22
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G13
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G17
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W6
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G24
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SE4
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G8
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N6
G10
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S5
G8
S6

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
El Monte, CA4 mi54 minN 010.00 miFair77°F15°F10%1016.6 hPa
La Verne / Brackett, CA12 mi52 minN 010.00 miFair72°F12°F10%1016.9 hPa
Los Angeles / USC Campus Downtown, CA17 mi52 minN 010.00 miFair77°F19°F11%1015.4 hPa
Fullerton, Fullerton Municipal Airport, CA19 mi46 minENE 12 G 2110.00 miFair78°F15°F9%1015.5 hPa
Burbank - Bob Hope Airport, CA20 mi46 minE 10 G 1510.00 miFair74°F7°F7%1015.1 hPa
Ontario, Ontario International Airport, CA22 mi46 minNE 26 G 3910.00 miFair and Windy71°F12°F10%1015.1 hPa
Chino, Chino Airport, CA22 mi46 minNE 15 G 2610.00 miFair74°F19°F12%1015.4 hPa
Hawthorne, Hawthorne Municipal Airport, CA23 mi46 minN 010.00 miFair74°F8°F8%1016.1 hPa
Long Beach, Long Beach Airport, CA23 mi46 minNNE 7 G 1710.00 miFair78°F8°F7%1015.7 hPa
Los Angeles, Whiteman Airport, CA23 mi44 minWNW 15 G 2010.00 miClear70°F12°F11%1018.3 hPa
Los Alamitos U. S. Army Airfield, CA24 mi1.7 hrsE 14 G 1910.00 miFair74°F19°F12%1015.8 hPa

Wind History from EMT (wind in knots)
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Last 24hrCalmS36N12
G18
W10
G15
W9
G17
NW8
G20
SW12
G19
NW6
G21
------------------------S6S4Calm
1 day agoS4--SW9S9SE11
G17
E7NE7----NW6
G16
----------------------CalmS4S3
2 days ago------S9
G16
S9
G14
--S6S9SW11
G16
S7----------------------CalmCalmCalm

Tide / Current Tables for El Segundo, Santa Monica Bay, California
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El Segundo
Click for Map
Sat -- 06:06 AM PDT     Sunrise
Sat -- 06:39 AM PDT     -0.96 feet Low Tide
Sat -- 09:05 AM PDT     Moonrise
Sat -- 01:11 PM PDT     3.71 feet High Tide
Sat -- 06:07 PM PDT     1.75 feet Low Tide
Sat -- 07:36 PM PDT     Sunset
Sat -- 11:25 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.95.24.12.61.1-0.1-0.8-0.9-0.40.51.62.63.43.73.63.12.521.81.92.53.34.35.1

Tide / Current Tables for Long Beach, Inner Harbor, California
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Long Beach
Click for Map
Sat -- 06:05 AM PDT     Sunrise
Sat -- 06:34 AM PDT     -0.96 feet Low Tide
Sat -- 09:05 AM PDT     Moonrise
Sat -- 01:06 PM PDT     3.70 feet High Tide
Sat -- 06:02 PM PDT     1.79 feet Low Tide
Sat -- 07:34 PM PDT     Sunset
Sat -- 11:23 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.753.92.41-0.2-0.9-0.9-0.40.61.72.73.43.73.53.12.521.822.63.44.35.1

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 (13,3,4,5)
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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.