El Segundo, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

611
FXUS66 KLOX 190549
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
1049 PM PDT Thu Jun 18 2026

.SYNOPSIS...18/620 PM.

Well below normal temperatures to continue through the weekend,
with a deep marine layer and a few spits of drizzle, as well as
gusty winds over the interior. A significant warming trend will
start Monday or Tuesday and peak Wednesday and Thursday.

&&

.SHORT TERM (THU-SUN)...18/803 PM.

***UPDATE***

The marine layer got so deep, that the low clouds scoured out
rather quickly late this afternoon and evening, but the clouds are
starting to redevelop. Expecting the marine layer itself to
change little through the weekend, as 500 millibar heights lower
a tad and fairly strong onshore pressure gradients (LAX-DAG
peaking around 9 millibars each afternoon) persist. This will
maintain well below normal temperatures everywhere, as well as
gusty onshore winds over the interior areas. The forecast is in
good shape, with the most significant changes focused on keeping
up with the mood changes of the marine layer.

***From Previous Discussion***

Marine layer stratus clouds have been slow to clear today,
especially across Ventura and LA counties. This is due mostly to
strong onshore flow, helping increase the depth of the marine
layer - up to 3000-4000 ft this morning - and push the stratus
further inland. A coastal eddy south of Point Conception may also
be contributing to the persistent low clouds. Everywhere below
the lingering stratus/stratocumulus was still experiencing
temperatures mostly in the 60s at noon today. The longer the
clouds linger over some of the inland valleys the less likely the
temperatures are to reach upper 70s to lower 80s and some of the
areas closer to the coast may only reach the upper 60s.

The June Gloom trend will continue through the short term with
moderate to strong onshore flow and the deeper marine layer
forecast to continue through this weekend. There may be enough
lift esp near the foothills to produce some morning drizzle.
Clearing will be slow today and many beaches will not clear at all
esp across VTA county.

The upper level flow will turn weakly cyclonic on Friday with a
shortwave trough moving through and will then become zonal on
Saturday. Hgts will remain near 588 dam through the period. Much
more importantly will be the strong onshore flow both to the N and
E. The push to the east will be near 10 mb each afternoon.

The passing shortwave Friday combined with the already strong
onshore flow and deep marine layer should induce slightly stronger
southwesterly downsloping winds into the Antelope Valley compared
to previous days which saw peak gusts up to 35-45 mph. A Wind
Advisory has been issued for Friday afternoon with the anticipated
slight uptick in magnitude.

A cooling trend will continue through Friday, with afternoon max
temperatures cooling another 1-3 degrees compared to today.
Only a few of the warmest vly locations will see highs reach or
eclipse 80 while the rest of the area sits in the 70s (the
nearshore area will actually not escape the 60s). Max temp will
change little on Saturday (perhaps a few degrees of warming across
San Obispo County) as the area remains swaddled by the cool
marine air and zonal flow. A few degrees of warming is expected on
Sunday as guidance shows onshore flow weakening slightly and H5
heights rising slightly.

.LONG TERM (MON-THU)...18/212 PM.

Zonal flow will continue over the area through at least Monday
morning before anticyclonic flow develops as an upper level high
strengthens ESE of SoCal. The onshore flow will weaken just a
little bit. This should decrease the morning cloud coverage a
little bit and allow for somewhat better and faster clearing. Look
for around 3 to 6 degrees of warming is possible Monday as hgts
rise a little and compresses the marine layer.

Models have backed off a little on the degree of warming slated
for next Tue-Thu. Hgts should still warm to an above normal with
global ensembles supporting 593-596 dam, which will be around the
90th-95th percentile of climatology. At the sfc, mdt-stg onshore
flow will persist in the W to E direction, but the onshore push
to the north will weaken through the period. The higher hgts will
likely smoosh the marine layer to 1000 ft or less which will
greatly reduce the amount of clouds making it into the vlys in the
mornings. This compression will strengthen the marine inversion
which will hinder the clearing near the shore. The current
forecast calls for 2 to 4 degrees of warming each day Tue and Wed
with little change on Thursday. This warming would bring vly temps
into the mid 80s and lower 90s. Latest NBM has good chances (50%)
of reaching 100 degrees across the Antelope Valley and even
slight chances (10%) in Paso Robles Wed-Fri. An Extreme Heat Watch
was issued for Tue-Thu for parts of LA County, including LA, with
temperatures expected to reach the 80s, to around 90 east of
Downtown LA. With an influx of people, especially those not from
the area, and events the risk of heat impacts will be greater,
despite forecast HeatRisk magnitudes of high-end Minor to low-end
Moderate.

&&

.AVIATION...19/0549Z.

At 0513Z at KLAX, the marine layer was 2500 ft deep. The top of
the inversion was near 5000 ft with a temperature of 20 Celsius.

High confidence in KPMD & KWJF staying VFR with gusty southwest
winds.

Low confidence in ceilings at all other airports. There is a 30 to
40 percent chc of IFR cigs at times. VFR transitions may be off
by +/- 2 hours

KLAX...Low to Moderate confidence in TAF. There is a 30 percent
chc of 015 cigs through 17Z and a 25 percent chc of 008 cigs
11Z-16Z. VFR conds could arrive as early as 18Z or as late as 22Z.
No significant east wind component expected.

KBUR...Low to Moderate confidence in TAF. There is a 30 percent
chc of cigs no hier than 015. There is a 25 percent chc of 008
cigs 11Z-16Z. VFR conds could arrive as early as 18Z or as late as
21Z.

&&

.MARINE...18/627 PM.

Fairly high confidence in winds and seas staying below Small
Craft Advisory (SCA) criteria through Sunday, but typically gusty
winds of 15 to 20 knots will form each afternoon and evening over
many nearshore waters as well as around the Channel Islands.

&&

.BEACHES...18/241 PM.

A long period south to southwest swell (14 seconds and 16
seconds) will continue to affect the coastal waters through at
least Friday. A Beach Hazard Statement is in effect through
Thursday evening due to elevated surf of 3 to 5 feet on south-
facing beaches of Ventura County Beaches, Malibu Coast, and Los
Angeles County Beaches. Portions of the Southern Santa Barbara
County Beaches could see surf to 2 to 4 feet.

High tides will continue to lower and should stay below 6.5 feet
MLLW. The coastal flooding risk has lowered significantly as a
result.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Extreme Heat Watch in effect from Tuesday morning through
      Thursday evening for zones 88-368-372-373-379-380-548. (See LAXNPWLOX).
     Beach Hazards Statement in effect until 3 AM PDT Friday for
      zones 349-350-354-362-366. (See LAXCFWLOX).
     Wind Advisory in effect from 1 PM to 10 PM PDT Friday for
      zones 381-383. (See LAXNPWLOX).
PZ...NONE.

&&

$$

PUBLIC...SB/RK
AVIATION...Rorke
MARINE...RK
BEACHES...Batz
SYNOPSIS...RK

weather.gov/losangeles

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