Marine Weather and Tides
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|Sunrise 6:51AM||Sunset 6:54PM||Tuesday September 25, 2018 6:07 AM PDT (13:07 UTC)||Moonrise 6:44PM||Moonset 6:21AM||Illumination 100%|
7 Day Forecast for Marine Location Near Casmalia, CAHourly EDIT Help
Area Discussion for - Los Angeles/Oxnard, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 klox 251208|
area forecast discussion
national weather service los angeles oxnard ca
508 am pdt Tue sep 25 2018
Synopsis 25 325 am.
Afternoon temperatures will be near normal today. An upper high
will bring temperatures to much above normal levels Wednesday and
Thursday. Low pressure will bring some cooling on Friday, with
much cooler weather Saturday through Monday.
Short term (tdy-thu) 25 345 am.
Low clouds were widespread in all coastal and valley areas this
morning, with the exception of the santa clarita valley, and
clouds will probably push into that area before daybreak.
The marine layer was around 1800 feet again early this morning.
Onshore pressure gradients have begun to weaken. Profiler data
was showing a bit of cooling all the way through 4000 feet, with
the most cooling between 2000 and 3000 feet. With weakening
onshore gradients and a weakening inversion, except somewhat
faster clearing today, by mid morning in the valleys, and by late
morning across most of the coastal plain. The WRF shows some
warming at 950 mb this afternoon, and this, in concert with
faster clearing and weaker onshore flow, expect a few degrees of
warming in most areas today. This will bring temps close to normal
in most areas.
An upper high well off the pac NW coast will build into northern
california tonight and wed. Another ridge will develop just to the
west of the forecast area ahead of a large upper low moving slowly
eastward through the eastern pacific, far to the west of the
region. Heights and thicknesses will rise across the forecast area,
which will cause the marine layer to become more shallow. Night
through morning low clouds and fog will likely be confined to the
coastal plain, and possibly to locations within a few miles of the
beaches. Pressure gradients will become nearly neutral late
tonight, then will be only weakly onshore Wed afternoon. This
should lead to significant warming in all areas on wed, with temps
possibly approaching 100 degrees in the antelope valley, at lower
mountain elevations, and in the warmest locations in the valleys.
The upper low will continue to move slowly toward ca Wed night and
thu, the ridge will hold strongly across the region. Gradients may
even become very weakly offshore Thu morning, then become onshore
thu afternoon. Expect night through morning low clouds and fog
to be confined to the coastal plain, and once again possibly to
areas near the immediate coast. There may be a bit of cooling
near the coast on thu, mainly north of point conception.
Elsewhere, expect similar MAX temps, and there could even be a
couple of degrees of warming across ventura and los angeles
counties away from the beaches.
Long term (fri-mon) 25 414 am.
The ec and the GFS are in fairly good agreement showing the upper
low tracking eastward toward the west coast Thu night fri, and it
will be located about 250 nm west of san francisco by late fri
afternoon. Heights thicknesses will fall across the region, and
onshore flow will increase fri. Expect more in the way of night
through morning low clouds Thu night Fri morning, with clouds
possibly sneaking into the valleys. There should be several
degrees of cooling in most areas fri, especially in the valleys.
Both the GFS and ec show the upper low tracking into far northern
ca or extreme southern oregon late by late Sat afternoon and
evening, a definite shift to the north for the gfs. A trough will
extend southward to just west of the forecast area. Expect the
marine layer to continue to deepen, with widespread night thru
morning low cloud in all coastal and valley areas. There should be
several more degrees of cooling in most areas sat, with temps down
to near or possibly evening slightly below normal levels.
A trough will linger west of the region on sun, maintaining a deep
marine layer and plenty of night morning low clouds and fog west|
of the mountains. Do not expect too much change in MAX temps sun.
For Sun night mon, the models begin to diverge, with a rather
complex upper pattern evolving across the eastern pacific. The ec
has an upper low approaching northern ca Sun night, while the gfs
has a broader trough in this location, with a strong upper low a
few hundred miles to the northwest of it. The ec shows its upper
low moving into northern ca on mon, while the GFS shows the first
trough minoring out and its upper low dropping southward to a
position a few hundred miles west of pt conception by mon
afternoon. The ec suggests that the tail end of a frontal system
could bring a chance of rain to areas north of pt conception on
mon. The GFS captures an upper system off baja and lifts it
northward across northern baja and extreme southern ca by mon
afternoon. The GFS shows rain across most of l.A. County Monday
afternoon, with significant rain just to the south and east of the
area. This looks a bit odd, but it certainly bears watching, and
a chance of precip may have to be introduced into the forecast for
mon is later runs continue to support this solution.
Aviation 25 1207z.
At 1113z, the marine layer depth was near 1300 feet deep at klax.
The top of the inversion was around 3500 feet with a temperature
of 22 degrees celsius.
N of point conception... Moderate confidence with ifr CIGS at
coastal tafs and vlifr conds at kprb. 30% chance that coastal cigs
could lower to lifr and also linger an additional hour from 12z
tafs. Expect similar conditions tonight with stratus developing
+ - 2 hours from currents tafs. Except better chance for lifr cigs
for ksmx ksbp. Higher confidence with no CIGS at kprb early wed
S of point conception... Moderate confidence with MVFR CIGS for
coastal tafs with high ifr CIGS at ksba briefly before coming
MVFR. Moderate confidence for ifr CIGS for valley TAF sites. 30%
chance that coastal CIGS could linger an additional hour or two.
Higher confidence for no CIGS for valley tafs tonight into wed
Klax... MVFR conditions will persist through at least 17z or as
late as 19z. No wind impacts are expected at this time.
Kbur... Ifr CIGS will scour out 16z or 17z this morning. Higher
confidence forVFR conds tonight into Wed morning. 30% chance for
ifr CIGS after 10z tonight.
Marine 25 152 am.
High confidence in wind and sea conditions remaining below small
craft advisory levels (sca) through Thursday and possibly into
Friday. There is a 30 percent chance of small craft advisory winds
late Thursday afternoon through Thursday evening across the
western portion of the outer waters.
No SCA issues expected for the inner waters through at least
Dense fog with visibility one nautical mile or less will likely
affect portions of the coastal waters N of point conception
through this morning.
Lox watches warnings advisories
Hazard potential outlook (thu-mon)
No significant hazards expected.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|46259||19 mi||46 min||58°F||7 ft|
|46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA||23 mi||78 min||NW 3.9 G 7.8||56°F||59°F||5 ft||1012.9 hPa (+0.0)|
|46218 - Harvest, CA (071)||32 mi||38 min||60°F||6 ft|
|PTGC1 - Point Arguello, CA||36 mi||68 min||NNE 5.1 G 7||53°F||1013.3 hPa (-0.0)|
|46215 - Diablo Canyon, CA (076)||42 mi||41 min||60°F||5 ft|
|PSLC1 - 9412110 - Port San Luis, CA||43 mi||38 min||53°F||60°F||1013.8 hPa|
|CPXC1||44 mi||30 min||N 2.9 G 5.1||53°F||1013.9 hPa||52°F|
Wind History for Port San Luis, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Lompoc, Vandenberg Air Force Base, CA||39 mi||2.2 hrs||N 0||2.50 mi||Fog/Mist||53°F||52°F||97%||1012.8 hPa|
Wind History from VBG (wind in knots)
|1 day ago||NW||NW||Calm||Calm|
|2 days ago|
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Wind Forecast for Los Angeles/Oxnard, CA (9,2,3,4)(on/off)  Help
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