Cal Poly University, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

970
FXUS66 KLOX 070409
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
909 PM PDT Mon Apr 6 2026

.SYNOPSIS...06/719 PM.

Temperatures will cool some again on Tuesday with increasing
onshore flow and areas of low clouds and fog near the coast.
Warmer temperatures will return briefly Wednesday before a
sustained cooling trend takes us into the weekend, along with a
chance of rain.

&&

.SHORT TERM (MON-THU)...06/908 PM.

***UPDATE***

A weak upper low brought cooling to the area today, aided by
onshore flow along the coast. Most of the cooldown occurred west
of the mountains, most notably along the Central Coast with highs
down 7 to 10 degrees from Sunday. Elsewhere from the valleys to
the coast, highs dropped by around 3 to 5 degrees.

Gusty, moderate northerly winds are currently affecting southwest
Santa Barbara County, where a Wind Advisory is in effect through
8 AM Tuesday. Gusts thus far have been peaking near 45 mph but
are expected to increase later this evening to up to 50 mph.
Pressure gradient tables indicate similar to slightly stronger
winds in this area again tomorrow night, and at that time an
Advisory may be needed for the I-5 Corridor as well. For tonight,
winds in the I-5 Corridor do not look to be quite strong enough.
Meanwhile, southwest to west winds are affecting the Antelope
Valley with gusts generally up to 30 mph. These onshore winds are
also expected to increase during the afternoon tomorrow, as the
LAX to Daggett gradients increase from around +6.2 mb to near 7
mb.

Low cloud cover is expected tonight into early Tuesday along most
of the coast except for the Santa Barbara South Coast. Fairly
extensive low clouds are likely over the Central Coast, with a
chance of moving into the Santa Ynez Valley. More uncertainty
exists with respect to the Oxnard Plain and LA Basin, but expect
coverage to be similar or slightly more expansive than what was
observed last night.

High temperatures on Tuesday will be in the 70s for most areas,
except for low 80s in some of the warmer valleys, and in the
Antelope Valley.

***From Previous Discussion***

Onshore pressure gradient are increasing this morning and will
further increase across the region this afternoon, when LAX-
Daggett pressure gradient could reach +5 to +6 mb range. This will
generate increasing onshore winds across the interior this
afternoon/evening, and this trend will continue the next few days.
Also expecting northwest pressure gradients to increase tonight
and the next few nights, with Santa Barbara-Santa Maria expected
to reach around -4 mb. A wind advisory has already been posted for
later today into tonight for the western Santa Ynez mountains and
southwest Santa Barbara coast, with gusts in the 35 to 50 mph
range. Winds will be strongest tonight from Gaviota to San Marcos
Pass. A wind advisory may need to be expanded to include the I-5
corridor and western Antelope Valley foothills as early as
tonight, with increasing probability for Tuesday night. In
addition, the sundowner winds are expected to shift eastward into
the eastern Santa Ynez range by Tuesday night, which may require
wind advisories for that region as well. North gradients will peak
Wednesday, and with an increase in support aloft and subsequent
downsloping south of the mountains, temperatures are expected to
rise anywhere from 3 to 6 degrees, making Wednesday the warmest
day of this week.

.LONG TERM (FRI-MON)...06/255 PM.

Light rain will be possible starting Thursday night, particularly
for areas north of Point Conception. By Friday, the cold upper
low will enter the region, bringing cooler temperatures, rain and
thunderstorms chances. Due to the cold and unstable nature of the
storm, thunderstorms will be possible. Most rain is likely to
fall between Friday and Saturday, with lingering chances for
showers and thunderstorms on Sunday. Rain totals with this storm
are likely to be between 0.25 inch and 1.0 inch, but locally up to
2 inches will be possible across some mountains and areas impacted
by thunderstorms. Ensemble means over the last couple days have
been fairly consistent with regards to average rain amounts and
timing. However there remains a lot of spread in the exact rain
totals between ensemble members, which suggests uncertainty in
rain totals and a showery rain pattern that would yield variable
rain amounts across the region. By early next week, a gradual
warming and drying trend is expected, however at this point there
is no strong signal for another storm or heatwave.

&&

.AVIATION...07/0249Z.

At 2205Z at KLAX, the marine layer was 1300 ft deep. The top of
the inversion was at 3400 ft with a temperature of 17 C.

Overall, moderate confidence in 00Z TAF Package. Timing of
CIG/VSBY restrictions may be off +/- 2 hours and flight minimums
by one category. There is a 30-40% chance for LIFR CIGs at KBUR &
KVNY after 10Z.

KLAX...Moderate confidence in TAF. Arrival and clearing times of
CIGs may be off +/- 2 hours. CIGs likely to range from IFR to
MVFR. Any east wind component that develops is expected to be
less than 5 kt.

KBUR...Moderate confidence in TAF. LIFR CIGs possible (40% chance)
after 10Z.

&&

.MARINE...06/904 PM.

Current Small Craft Advisories (SCA) look on track. SCA winds
will continue across all Outer Waters through Wednesday. There is
a 40% chance that a GALE Warning will be needed for the outer
waters south of Point Conception Tuesday evening through the
overnight hours. Another chance for outer water gales comes
Wednesday evening for about the same area.

The Inner Waters will reach SCA levels at times mainly during the
afternoon and evening hours - lower chances along the Central
Coast later in the week. There is a 30% chance of GALE force winds
Wednesday night across the Santa Barbara Channel and near the
Channel Islands.

Winds will diminish later in the week with moderate chances for
SCA winds lingering south of Point Conception on Thursday and
possibly into Friday.

A storm system is expected to impact the coastal waters starting
Thursday night lasting into the weekend bringing rainfall and the
potential for thunderstorms. Confidence is low on exact timing
and details for now.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory in effect until 8 AM PDT Tuesday for zones
      349-351. (See LAXNPWLOX).
PZ...Small Craft Advisory in effect until 3 AM PDT Tuesday for
      zone 645. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PDT Wednesday for
      zones 650-670-673-676. (See LAXMWWLOX).

&&

$$

PUBLIC...Gomberg/Schoenfeld
AVIATION...Phillips
MARINE...Phillips/Black
SYNOPSIS...MW/CC

weather.gov/losangeles

Experimental Graphical Hazardous Weather Outlook at:
https://www.weather.gov/erh/ghwo?wfo=lox