Flash Flood Warning 23, NWS Los Angeles, CA

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
440 AM PDT Tue Oct 14 2025

.SYNOPSIS...14/146 AM.

A strong storm system will bring widespread rain with isolated
heavy rain and scattered thunderstorms today. There is a
significant risk of debris flows, road flooding, and isolated wind
damage. The rain will diminish and end by late afternoon and
early evening. Dry conditions and warming trend will develop
Wednesday and continue through Saturday.

&&

.SHORT TERM (TDY-THU)...14/331 AM.

The strong cold front assoc with an early season low is currently
draped over the middles of SLO and SBA counties. A strong for
October 100kt jet stream is aligned almost perpendicular to the
main front and this will help move it along. Look for it to move
into and through the City of SBA between 330am and 500 am. The
Front will then enter VTA county around 5am and exit around 8am.
It will then enter LA county around 600 am and exit between 10am.
A tightly wrapped vort lobe is following on the heels of the front
and this will keep the shower and thunderstorm threat going for a
few hours after the main frontal passage.

Rainfall amounts so far have added up to about an inch and half
across SLO county; and inch across most of SBA county; a quarter
to a half inch for the non mtn areas of VTA county and about an
inch across most the counties mtns; LA county has received
anywhere from a tenth to a quarter inch. When all is said done
rainfall amounts should come close to the forecast numbers of
0.75 and 1.50 inches common, except 2.00 to 4.00 inches in the
favorable south facing slopes.

Peak rainfall rates in and near to the front have ranged from .5
to 1.00 inch/hr which is more than enough to create flooding and
debris flows over and near to the 1st and 2nd year burn scars. A
flash flood watch for these burn scars is in effect and people who
live near by must pay close attention to the weather and emergency
officials.

There is an unusual amount of twist in the lower atmosphere and
this along with all of the energy the jet is pumping into the
system and the excellent diffluence aloft has created a very
favorable environment for low topped severe convective storms.
Several severe storms as indicated by doppler weather radar have
already been observed with the front and its likely that it will
produce more as it marches through the rest of the area.

Gusty winds will occur ahead of the front and many areas across
the mtns and deserts will see advisory level gusts from 45 to 55
mph.

Snow will fall at the resort levels (7000+ ft) but will not affect
the major passes.

Lastly Max temps today will only be in the lower to mid 60s or 12
to 24 degrees blo normal - these temps, in fact, would be below
normal for January.

Look for clearing from the west to east during the afternoon and
early evening with dry conditions and mostly clear skies.

Wednesday will be sunny and dry as dry NW flow coming around the
backside of the departing upper low. There will be 5 to 10 degrees
of warming under sunny skies.

Good northerly upper level flow along with moderate offshore flow
from the north develops Wednesday and continues into Thursday
morning. There will be some northerly to northeasterly winds in
the morning but mostly likely under advisory levels. Otherwise
look for continued warming under sunny skies. Max temps will jump
another 5 to 10 degrees.

.LONG TERM (FRI-MON)...14/208 AM.

A little bit of northerly offshore flow along with weak upper
level northerly flow on the back side of a pos tilt trof moving
out of Srn CA will combine to bring some gusty northerly winds to
the mtn canyons and passes. Despite a little cool air advection
from the north max temps will by 3 to 4 degrees under sunny skies.
Max temps will, however, still remain under normals.

Weak ridging aloft along with weak offshore flow will bring
continued sunny skies to all of the area. Upper support and sfc
gradients are weaker than they were on Friday so there will only
be minimal morning winds. Max temps will bump up another 2 or 3
degrees and this will bring max temps up to near normal with
mostly 70s across the csts and 80s in the vlys.

A switch to onshore flow on Sunday will likely bring a return to
the coastal morning marine layer cloud deck. The onshore flow will
also bring 3 to 5 degrees of cooling up and down the csts/vlys.

Long wave troffing will move over the area on Monday bringing more
marine layer clouds and stronger onshore flow. Max temps will fall
4 to 8 locally 10 degrees and end up 6 to 12 degrees blo normals.

&&

.AVIATION...14/1139Z.

At 1122Z at KLAX, there a was 12000 ft moist layer.

Low confidence in the TAFs. A strong cold front will pass through
the area and will exit LA county around 20Z. Strong south winds
ahead of the front will create areas of TURBC over and near to
hier trrn through 20Z.

Both Cigs and Vis will vary frequently as the front nears passes
over every site. Ocnl IFR cig/vis is likely under heavier showers
and/or TSTMs. There is a 10-20 percent chc of TSTMs through 22Z.

KLAX...Low confidence in TAF. Cigs and Vis will vary frequently
08Z-20Z. There is a 30% chance of a thunderstorm from 12Z to 18Z
Tue. There is a 25 percent chc of ocnl 2SM ovc008 conds 12Z-18Z.
High confidence in a 12-18 kt east wind component 13Z-17Z.

KBUR...Low confidence in TAF. Cigs and Vis will vary frequently
08Z-20Z. There is a 30% chance of a thunderstorm from 12Z to 18Z
Tue. There is a 25 percent chc of ocnl 2SM ovc008 conds 12Z-18Z.

&&

.MARINE...14/225 AM.

Through this afternoon, a storm system and associated cold front
will move across the region. This will bring a 20-40% chance of
thunderstorms to all of the coastal waters during that timeframe.
Any thunderstorms that form may be capable of frequent cloud to
surface lightning, gusty and erratic winds with locally higher,
choppy seas, small hail, and even a waterspout. Please see the
latest Marine Weather Statement (LAXMWSLOX) for further details.

For the outer waters and inner waters N of Point Sal, Small Craft
Advisory (SCA) level south winds are expected (60%-70% chance)
with the cold front this morning, then decreasing from the west
behind the front this afternoon and evening. Wednesday through
Thursday increasing NW winds will likely reach SCA levels once
again. Best chances south of Point Conception. Conds should then
be below SCA levels Friday through Saturday night.

For the inner waters south of Point Conception, S to SW winds
at SCA levels are expected across the area through this morning
as the front moves through the region. There is a 50% chance of
Gale Force winds over these waters through mid morning. The
strongest winds will be north of Santa Cruz and Anacapa Islands
and along the coast from Point Mugu to Point Dume. Conds should
then be below SCA levels Tuesday night through Saturday night.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory in effect until 8 AM PDT this morning for zones
      38-342>345-351>353. (See LAXNPWLOX).
     Flood Watch remains in effect until 3 PM PDT this afternoon
      for zones
      38-88-342-344-345-348-353-355-358-362-368>375-377>380-548. (See LAXFFALOX).
     Wind Advisory in effect until 2 PM PDT this afternoon for
      zones 376>383. (See LAXNPWLOX).
PZ...Small Craft Advisory in effect until 9 AM PDT this morning
      for zone 645. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 PM PDT this afternoon
      for zones 673-676. (See LAXMWWLOX).

&&

PUBLIC...Rorke
AVIATION...Rorke
MARINE...Sirard/Ciliberti
SYNOPSIS...RK/CC

weather.gov/losangeles

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

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