Glendale, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

299
FXUS66 KLOX 301105
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
405 AM PDT Fri May 30 2025

.SYNOPSIS...30/338 AM.

Significant warming today with an elevated risk for heat illness.
Cooler but more humid over the weekend as tropical moisture moves
over the region, also bringing a chance for showers or a
thunderstorm. Near normal conditions to follow Monday and Tuesday,
before another warm up arrives for the back half of next week.

&&

.SHORT TERM (TDY-SUN)...30/401 AM.

A shallow marine layer has brought dense fog and low visibilities
to northwest Santa Barbara County this morning, which will likely
linger into the daylight hours. Low confidence on how the low
clouds and fog will behave elsewhere, including off Los Angeles
County as a sudden and much delayed surge is now pushing up from
San Diego County.

Southwest California will be caught in between a narrow upper
level high just to the north and a stationary cutoff low just to
the south (more on the low later). With weakening onshore flow and
a reduced marine layer, expect more sunshine and drastically
warmer conditions on the coastal side of the ranges today when
compared to yesterday. Highs will generally be in the 70s near
the coast, 80s over the inland coastal plains, and 90s to 102 in
the valleys and lower mountains. The previously issued Heat
Advisories look good with no changes planned, highlighting the
elevated risk for heat illness for sensitive populations,
including those active outdoors like hikers. While sunny skies
will be common today, a few afternoon cumulus clouds should bubble
up in the mountains, but look unlikely to result in any showers
at this point.

Temperatures will lower some over the weekend but will continue
to feel warm as humidity rises, especially towards Los Angeles
County as that fairly stationary low draws up tropical moisture
from Mexico. With precipitable water values approaching Monsoon-
like 1.5 inches, expecting a noticeable muggy factor on the rise
from Saturday through Sunday. Combine this moisture with a few
upper level disturbances (with omega values of 10+ at 500
millibars) and marginal instability (MUCAPE 500-1000 and K-Index
around 35), and a few showers or even a thunderstorm is also in
the cards. That potential is highest towards Los Angeles County,
and more so Saturday Night through Sunday. If any shower develops,
it will likely be light or a few fat drops, with the highest
potential of a legit shower over the mountains and deserts. The
thunderstorm potential is highest over the mountains in the
afternoon hours, and over the waters overnight. Winds will be
rather complex with varying wind directions, especially if a
heavier shower or thunderstorm forms.

.LONG TERM (MON-THU)...30/405 AM.

Another low pressure system will drop through California Monday
and Tuesday, but does not look to stall like our weekend system.
This will likely accelerate our return to a more typical June
Gloom pattern with seasonal temperatures. Ensemble projections
show a range of outcomes after that from Wednesday on. While the
majority favor a warm up, little change is also a possibility.

&&

.AVIATION...30/0524Z.

At 0456Z, the marine layer was 700 feet deep at KLAX. The top of
the inversion was around 3200 feet with a temperature of 25 C.

Overall, low to moderate confidence in the 00Z TAF Package. High
confidence for desert and valley terminals and low for coastal
sites. Significant lowering of the marine layer is expected
tonight with IFR conditions along the coast and a 15% chance of
LIFR conditions. There is also a 30% chance that conditions remain
VFR through 18Z Fri.

KLAX...Low confidence in the 06Z TAF. Most likely outcome is IFR
cigs developing around 08Z, with clearing around 16Z Fri (+/- 2
hours). There is a 10% chance of LIFR conds if cigs materialize.
However, there is a 30% chance conds remain VFR (FEW-SCT) through
00Z Sat. Uncertain in return of cigs after 03Z Sat. No significant
east wind component expected.

KBUR...High confidence in the 06Z TAF. VFR conditions are expected
to dominate the fcst pd.

&&

.MARINE...30/321 AM.

For the outer waters, moderate to high confidence in current
forecast. Small Craft Advisory (SCA) conditions are expected to
linger into the morning hours (PZZ673) and evening hours (PZZ670)
on Friday. Conditions are then expected to remain below SCA
levels through Saturday. Thereafter, chances will increase for
SCA winds and seas early next week (higher confidence in seas
reaching SCA thresholds).

For the nearshore waters along the Central Coast, Conditions are
expected to remain below SCA criteria through the weekend.
However, there is a 30% chance of SCA level NW wind gusts during
the afternoon hours on Friday. Low chance for SCA winds and seas
early next week.

For the Santa Barbara Channel, moderate-to-high confidence in
conds remaining below SCA criteria through the weekend. There is
a 30% chance of SCA level winds for western portions during the
afternoon and evening hours on Monday.

For the Inner Waters off the Los Angeles and Orange County coasts,
moderate-to-high confidence in conditions remaining below SCA
levels through Tuesday. However, there is a 30% chance of SCA
level wind gusts nearshore Mailbu during the late afternoon/eve
hours on Friday.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory remains in effect from 11 AM this morning to 8
      PM PDT this evening for zones 38-88-343>345-358-372-373. (See LAXNPWLOX).
     Dense Fog Advisory in effect until 9 AM PDT this morning for
      zones 346>348. (See LAXNPWLOX).
PZ...Small Craft Advisory in effect until 9 PM PDT this evening
      for zone 670. (See LAXMWWLOX).
     Small Craft Advisory in effect until noon PDT today for zone
      673. (See LAXMWWLOX).

&&

$$

PUBLIC...Kittell
AVIATION...Black/Ciliberti
MARINE...Black
SYNOPSIS...RK

weather.gov/losangeles

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