720
FXUS66 KLOX 071216
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
516 AM PDT Sun Jul 7 2024

.SYNOPSIS...07/515 AM.

A long-lasting and extreme heatwave will continue across the
region, especially the interior, through much of next week. There
is a high risk for dangerous heat illness and fast-growing fires.
High temperatures will reach 105 to 115 across interior valleys,
mountains and deserts. Dense fog may develop across some beaches
during the night and morning hours.

&&

.SHORT TERM (TDY-TUE)...07/437 AM.

Strong upper high level high pressure will linger across the
region today. Slight height falls may result in a degree or two
of cooling in the mountains and desert. Some cooling is also
possible in coastal areas, due to slow clearing of marine layer
clouds today. Despite slight cooling, Excessive Heat Warnings are
still necessary due to temperatures of 95-105 degrees across the
coastal slopes and Santa Clarita Valley, and 105-115 degrees
across the far interior areas including the Antelope Valley.
Expecting low clouds this morning to burn off, but there is a good
chance that the clouds will hug the coast through the day and
maybe not even clear at some of the beaches.

Monday should again be very similar to today, if not a little bit
warmer as the onshore flow starts to weaken. Tuesday will once
again warm up as the gradients will weaken even more, allowing
the valleys to warm up - possibly to heat advisory levels.

Sundowners across the Santa Barbara South coast will start Monday
night resulting in winds close to, but likely just sub- advisory
levels. However, Tuesday night the offshore gradients will
increase and likely result in advisory level winds across the SBA
South Coast.

.LONG TERM (WED-SAT)...07/511 AM.

The upper level high will slowly move eastward through the workweek
and by Saturday, a weak upper level trough will start to push
into the California Coast. Onshore gradients will continue to
weaken through midweek, allowing Wednesday and Thursday to be
extremely similar to Tuesday in terms of temperatures and cloud
coverage. Thus, the excessive heat will continue across the the
interior valleys, mountains, and deserts, and possible heat
advisories or even warnings across the valleys of Ventura and Los
Angeles Counties, and a less, but still present, chance across the
far interior coastal plains.

The Central Coast is expected to have night and morning low
clouds and fog through the period, with varying amounts of low
clouds and fog South of Point Conception, primarily on the
L.A. and Ventura County coast at times. However, the (likely
advisory level) Sundowner winds across Southern Santa Barbara
County Wednesday and Thursday nights should keep the
southern coast free of low clouds.

Temperatures should cool down enough Friday and Saturday due to
stronger onshore flow to the N and E, that the only locations that
may need heat products would be the L.A. County interior mountains
and deserts. However, even with cooler temps for the coast and
valleys, it will still be several degrees above normal each day.

&&

.AVIATION...07/0653Z.

At 06Z at KLAX, the marine layer was 900 feet deep. The top of
the inversion was at 4200 feet with a temperature of 33 deg C.

High confidence in CAVU TAFs for KPRB, KPMD, and KWJF.

Low confidence in all other TAFs. Flight category changes may be
off by +/- 2 hours. LIFR conditions possible starting after 08Z at
KSMO (20%), KLAX (30%), KLGB (20%).

VLIFR conditions possible 08Z-16Z at KSBP (20%), KSMX (40%), KSBA
(40%), KOXR (40%), KCMA (30%), KBUR (10%), and KVNY (10%) due to
rapid shallowiing of the marine layer. Cigs/vsbys are likely
(80-90%) to improve to MVFR-VFR conditions 18-22Z. There is a
chance that KOXR/KSBA/KSMX (30-50%) have limited to no clearing.

Nearby fires may lead to periods of MVFR/VFR smoke at terminal,
especially KSBA and north.

KLAX...Moderate confidence in the 06Z TAF. Timing of flight cat
changes could be off by +/- 2 hours. There is a chance (30%) of
1/2SM and BKN002-BKN004 conditions thru 14Z Sun. Good confidence in
any east wind component remaining under 5 kts.

KBUR...Low confidence in the 06Z TAF. Cig/vis arrivals could be
off by +/- 2 hours. There is 10% chance of 1/4SM and BKN002 conds
10Z-14Z Sun. There is a 40% chance of no cig/vsby arrival.

&&

.MARINE...06/935 PM.

For the Outer Waters, expecting winds to generally remain below
SCA levels tonight and Sun morning. However, cannot rule out local
gusts near SCA levels along the Central Coast and near Point
Conception. Winds are expected to decrease overnight tonight.
There is a 30% chance for SCA level winds Sunday afternoon and
evening near Point Conception. By Monday, chances for SCA winds
increase to around 40%, with more widespread winds through the
outer waters through Tuesday night. Could see SCA winds
Wednesday through Thursday as well.

In the inner waters N of Pt. Sal, there is a 30% chance of SCA
level winds during the afternoon/evening hours Mon and Tue,
otherwise SCA conds are not expected thru Wed night.

In the inner waters south of Pt Conception, SCA conditions are
not expected thru Thu. However, there is a 20% chance for SCA
level winds over far western portions of the Santa Barbara
Channel Sunday evening. Then there is a 30% chance of SCA winds
during the afternoon/evening hours Tue thru Thu in western
portions of the Santa Barbara Channel, mainly from Santa Cruz
Island to the SBA County south coast from Pt. Conception to
Gaviota to Refugio State Beach.

Areas of dense fog will continue to affect the coastal waters
through Sun morning. Please reference the Marine Weather
Statement for additional information.

&&

.BEACHES...06/958 PM.

A moderate southerly swell will continue to affect the Southern
California coastal waters through Sunday, with a 14-16-second
period this weekend. While surf is not expected to be particularly
high, surf heights of up to 4 to 6 feet are anticipated at
beaches exposed to southerly swell, especially the LA and Ventura
County beaches.

Significant wave energy with the long-period swell will combine
with the elevated surf to create dangerous conditions at area
beaches, with powerful and dangerous rip currents expected. This
is especially the case for the south-facing beaches of LA and
Ventura Counties. A Beach Hazards Statement is in effect through
Sunday evening to address these concerns.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Excessive Heat Warning remains in effect until 9 PM PDT
      Wednesday for zones 38-343>345-353-376>379-381>383. (See LAXNPWLOX).
     Excessive Heat Warning remains in effect until 9 PM PDT this
      evening for zones 88-351-352-375-380. (See LAXNPWLOX).
     Beach Hazards Statement in effect through this evening for
      zones 354-362-366. (See LAXCFWLOX).
     Red Flag Warning in effect until 6 AM PDT Monday for zones
      378-381. (See LAXRFWLOX).
PZ...NONE.

&&

$$

PUBLIC...Lund/DB
AVIATION...Lewis/KL
MARINE...Phillips/DB
BEACHES...LP/DB
SYNOPSIS...Sirard

weather.gov/losangeles

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