Pasadena, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

644
FXUS66 KLOX 170358
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
758 PM PST Tue Dec 16 2025

.SYNOPSIS...16/726 PM.

Dense fog will affect the Los Angeles area tonight and Wednesday
morning. Well above normal temperatures will continue through
Friday, with locally gusty north to northeast winds peaking
tonight through Wednesday Night. Dry conditions will continue at
least through Saturday, but a storm will affect the area sometime
early to mid week next.

&&

.SHORT TERM (TUE-FRI)...16/754 PM.

***UPDATE***

The marine layer is currently 500 ft deep. A weak eddy has brought
low clouds as far north as Santa Barbara. The low clouds will
likely settle overnight and produce areas of dense fog up and down
the coast. A dense fog advisory is in effect until 10 am Wednesday
for the coasts. A wind advisory is in effect for the Santa Ynez
range, but the winds are a little slow to develop and will likely
come up around midnight when the rest of the wind advisories for
the mtns go into effect. A little less confidence in these wind
advisories as KBFL-KLAX pressure gradient may be a little
unrepresentative due to the Tule Fog`s effect on the KBFL
pressure.

The eddy and marine layer wreaked havoc on the temperature
forecast for the coasts south of Pt Conception - where warming was
forceast cooling actually occurred. The offshore flow and much
higher than normal hgts did bring warming to the rest of the area,
esp the mtns and the Central Coast where 8 to 12 locally 15
degrees of warming was noted.

Wednesday will see slow morning clearing at the coasts south of Pt
Conception. Skies, otherwise, will be partly cloudy as high clouds
drift overhead. The winds will begin to increase in earnest around
noon and are forecast to peak early in the evening. The main wind
thrust will be across the northern mtns, I-5 corridor and Antelope
Vly in the afternoon. By late afternoon the wind max will extend
to the south and will move into the Santa Clarita Vly, The western
San Fernando Vly, The Calabasas region and the Santa Monicas.
There is a chc there strong winds will make it Malibu, the City of
Santa Monica and the KLAX area.

Temperatures Wednesday will be tricky across the coasts as they
will be dependent on the dominant weather if the marine layer
holds sway max temps will again be on the cool side, but if the
offshore winds make it to the coasts than temps will rise above
forecast values.

The forecast was updated to fiddle with clouds, fog and temps.

***From Previous Discussion***

The offshore flow and strong ridge aloft will combine to support
widespread highs in the 70s and 80s through Thursday with the
warmest coastal valleys such as near Woodland hills possibly
flirting with 90. Those sensitive to the heat may want to take
extra precautions, especially if outside for a prolonged period of
time.

.LONG TERM (SAT-TUE)...16/225 PM.

The next of a series of storms is expected to impact the West
Coast this weekend. Most the impacts from the storm will remain
well to our north. However, periods of light rain are possible,
mainly San Luis Obispo, possibly teetering into northern Santa
Barbara County, at times Saturday through Monday. Further south,
the associated breakdown of the ridge will support cooling to
coastal valleys in particular.

We continue to track the potential for a wet period during the
holidays with an 80 percent chance of a moderate to strong strong
sometime in the December 23rd-26th time frame with active weather
possibly continuing beyond this period.

&&

.AVIATION...16/2333Z.

At 2240Z, the marine layer was around 600 feet deep at KLAX. The
inversion was topped at 3600 feet with a temperature of 22 degrees
C.

High confidence in VFR conds for KPRB, KSBP, KSMX, KBUR, KVNY,
KPMD, and KWJF. Moderate confidence in winds for all sites except
high for KPRB. Timing of wind shifts may be off +/- 3 hours, and
max wind gusts may be 15 kts higher at times. For KSBP, 30% chance
for NE winds 10-15 kts to surface from 16Z through the end of the
period.

Low confidence in TAFs for KLAX, KSBA, KOXR, KCMA, KSMO, and
KLGB. For tonight, moderate to high confidence in VLIFR to LIFR
conds for KLAX, KLGB and KSMO as early as 02Z and continuing into
at least 16Z. Moderate confidence for KOXR and KCMA. Low
confidence for KSBA, 40% chance for VLIFR to LIFR conds as early
as 06Z. Flight cat changes may be off +/- 3 hours. Arrival of
north winds for KLAX, KLGB, KSBA, and KSMO may be off +/- 3 hours,
and gusts may be 10 kts higher than forecast, with highest
uncertainty in wind speeds at KSMO.

KLAX...Low confidence in TAF. There is a 40% chance for vsbys
less than 1/4SM any point when cigs return, especially 02Z through
16Z. Flight cat changes may be off +/- 2 hours. Any east wind
component should remain less than 7 knots, however north winds
will arrive sometime between 17/18Z-18/00Z. There is a 30% chance
for gusts above 20 kts through 05Z.

KBUR...Moderate confidence in TAF. VFR conditions are expected
through the period. North wind arrival may be off +/- 3 hours.
There is a 30% chance for gusts to 30 knots after 17/20Z.

&&

.MARINE...16/753 PM.

High confidence in the current forecast through Thursday, then
moderate to high confidence thereafter.

For the waters southwest through northwest of the Channel Islands
and the nearshore waters along the Central Coast, there is a 60-90
percent chance of Small Craft Advisory (SCA) level winds through
Friday, highest during the afternoon and evening hours beyond 20
NM from shore. There is a 30-40 percent chance of widespread
GALES each afternoon and evening through Wednesday night, but
local GALE force gusts are possible each afternoon and evening
from Point Conception south to San Nicolas Island. Winds will
likely diminish some for Thursday night into Friday with chances
of SCA level winds decreasing to a 40-70 percent chance, highest
from Point Conception south to San Nicolas Island.

Inside the southern California bight, winds and seas will remain
below SCA levels through Wednesday, but there is a moderate (30-40
percent) chance of SCA level winds across the western portions.
Winds will increase on Wednesday and continue into Wednesday night
while becoming northerly and impacting near coastal nears from
Malibu to Palos Verdes with a 50-70 percent chance of SCA
conditions. Winds and seas should drop below SCA levels for Friday
and Saturday.

Patchy dense fog will continue at times through at least Wednesday
morning, likely becoming more widespread tonight.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory in effect from noon to 10 PM PST Wednesday for
      zones 88-356-362-369>375-383. (See LAXNPWLOX).
     Wind Advisory in effect until 4 AM PST Thursday for zones
      349-351. (See LAXNPWLOX).
     Wind Advisory in effect from 2 AM Wednesday to 4 AM PST
      Thursday for zones 352-353-376>381. (See LAXNPWLOX).
     Dense Fog Advisory in effect until 10 AM PST Wednesday for
      zones 366-368. (See LAXNPWLOX).
PZ...Small Craft Advisory in effect from 6 PM Wednesday to 2 AM
      PST Thursday for zone 655. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PST Thursday for
      zones 670-673-676. (See LAXMWWLOX).

&&

$$

PUBLIC...Munroe
AVIATION...Lewis
MARINE...Lewis/Hall
SYNOPSIS...jld

weather.gov/losangeles

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