Frost Advisory 21, NWS Los Angeles, CA

964 
WWUS76 KLOX 121127
NPWLOX

URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
327 AM PST Thu Dec 12 2024

CAZ383-121700-
/O.CON.KLOX.FZ.W.0015.000000T0000Z-241212T1700Z/
Antelope Valley-
Including the cities of Palmdale, Lake Los Angeles, and Lancaster
327 AM PST Thu Dec 12 2024

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 15 degrees expected.

* WHERE...Antelope Valley.

* WHEN...Until 9 AM PST this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

To prevent water pipes from freezing; wrap or drain or allow them to 
drip slowly.

&&

$$

CAZ340-341-347-122330-
/O.EXA.KLOX.WI.Y.0101.241212T2000Z-241213T0200Z/
San Luis Obispo County Beaches-San Luis Obispo County Inland
Central Coast-Santa Barbara County Inland Central Coast-
Including the cities of Cambria, Lopez Lake, Pismo Beach, Avila
Beach, Morro Bay, Nipomo, San Luis Obispo, Buellton, Santa Maria,
and Arroyo Grande
327 AM PST Thu Dec 12 2024

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 6 PM PST THIS 
EVENING...

* WHAT...Northwest winds 15 to 25 mph with gusts up to 35 mph 
  expected.

* WHERE...San Luis Obispo County Beaches, San Luis Obispo County 
  Inland Central Coast, and Santa Barbara County Inland Central 
  Coast.

* WHEN...From noon today to 6 PM PST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for drivers 
of high profile vehicles. Use extra caution.

&&

$$

CAZ357-371-121700-
/O.CON.KLOX.FR.Y.0021.000000T0000Z-241212T1700Z/
Ojai Valley-Calabasas and Agoura Hills-
Including the cities of Oak View, Ojai, Westlake Village, and
Malibu Lake
327 AM PST Thu Dec 12 2024

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WHAT...Temperatures of 33 to 35 degrees will result in frost 
  formation.

* WHERE...Calabasas and Agoura Hills and Ojai Valley.

* WHEN...Until 9 AM PST this morning.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive 
  outdoor plants may be killed if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

CAZ346-349-351>353-122330-
/O.CON.KLOX.WI.Y.0101.241212T2000Z-241213T0200Z/
Santa Barbara County Central Coast Beaches-Santa Barbara County
Southwestern Coast-Santa Ynez Mountains Western Range-Santa Ynez
Mountains Eastern Range-Santa Barbara County Interior Mountains-
Including the cities of El Capitan State Beach, Vandenberg Space
Force Base, San Marcos Pass, Refugio State Beach, Figueroa
Mountain, Gaviota, San Rafael Mountain, Montecito Hills, Big Pine
Mountain, Lompoc, and Jalama Beach
327 AM PST Thu Dec 12 2024

...WIND ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 6 PM PST THIS 
EVENING...

* WHAT...North to northwest winds 15 to 30 mph with gusts of 35 to 
  45 mph expected. Wind gusts will be highest in the mountains.

* WHERE...Santa Barbara County Central Coast Beaches, Santa Barbara 
  County Interior Mountains, Santa Barbara County Southwestern 
  Coast, Santa Ynez Mountains Eastern Range, and Santa Ynez 
  Mountains Western Range.

* WHEN...From noon today to 6 PM PST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for drivers 
of high profile vehicles. Use extra caution.

&&

$$

CAZ354-122330-
/O.CON.KLOX.WI.Y.0101.241212T2200Z-241213T0200Z/
Ventura County Beaches-
Including the cities of Port Hueneme, Point Mugu, Ventura, and
Oxnard
327 AM PST Thu Dec 12 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 6 PM 
PST THIS EVENING...

* WHAT...West to northwest winds 15 to 25 mph with gusts up to 35 
  mph expected.

* WHERE...Ventura County Beaches.

* WHEN...From 2 PM this afternoon to 6 PM PST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

Visit us at http://www.weather.gov/LosAngeles

DB

447 
WWUS76 KLOX 121703
NPWLOX

URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
903 AM PST Thu Dec 12 2024

CAZ383-121815-
/O.EXP.KLOX.FZ.W.0015.000000T0000Z-241212T1700Z/
Antelope Valley-
Including the cities of Lancaster, Palmdale, and Lake Los Angeles
903 AM PST Thu Dec 12 2024

...FREEZE WARNING HAS EXPIRED...

$$

CAZ357-371-121815-
/O.EXP.KLOX.FR.Y.0021.000000T0000Z-241212T1700Z/
Ojai Valley-Calabasas and Agoura Hills-
Including the cities of Ojai, Oak View, Malibu Lake, and Westlake
Village
903 AM PST Thu Dec 12 2024

...FROST ADVISORY HAS EXPIRED...

$$

CAZ340-341-347-130200-
/O.CON.KLOX.WI.Y.0101.241212T2000Z-241213T0200Z/
San Luis Obispo County Beaches-San Luis Obispo County Inland
Central Coast-Santa Barbara County Inland Central Coast-
Including the cities of Nipomo, Arroyo Grande, Lopez Lake,
Buellton, Santa Maria, Pismo Beach, Cambria, Avila Beach, Morro
Bay, and San Luis Obispo
903 AM PST Thu Dec 12 2024

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS EVENING...

* WHAT...Northwest winds 15 to 25 mph with gusts up to 35 mph 
  expected.

* WHERE...San Luis Obispo County Beaches, San Luis Obispo County 
  Inland Central Coast, and Santa Barbara County Inland Central 
  Coast.

* WHEN...Until 6 PM PST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for drivers 
of high profile vehicles. Use extra caution.

&&

$$

CAZ346-349-351>353-130200-
/O.CON.KLOX.WI.Y.0101.241212T2000Z-241213T0200Z/
Santa Barbara County Central Coast Beaches-Santa Barbara County
Southwestern Coast-Santa Ynez Mountains Western Range-Santa Ynez
Mountains Eastern Range-Santa Barbara County Interior Mountains-
Including the cities of Refugio State Beach, Gaviota, Vandenberg
Space Force Base, Figueroa Mountain, Big Pine Mountain, Lompoc,
Jalama Beach, San Marcos Pass, El Capitan State Beach, San Rafael
Mountain, and Montecito Hills
903 AM PST Thu Dec 12 2024

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS EVENING...

* WHAT...North to northwest winds 15 to 30 mph with gusts of 35 to 
  45 mph expected. Wind gusts will be highest in the mountains.

* WHERE...Santa Barbara County Central Coast Beaches, Santa Barbara 
  County Interior Mountains, Santa Barbara County Southwestern 
  Coast, Santa Ynez Mountains Eastern Range, and Santa Ynez 
  Mountains Western Range.

* WHEN...Until 6 PM PST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for drivers 
of high profile vehicles. Use extra caution.

&&

$$

CAZ354-130200-
/O.CON.KLOX.WI.Y.0101.241212T2200Z-241213T0200Z/
Ventura County Beaches-
Including the cities of Point Mugu, Ventura, Oxnard, and Port
Hueneme
903 AM PST Thu Dec 12 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 6 PM 
PST THIS EVENING...

* WHAT...West to northwest winds 15 to 25 mph with gusts up to 35 
  mph expected.

* WHERE...Ventura County Beaches.

* WHEN...From 2 PM this afternoon to 6 PM PST this evening.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

Visit us at http://www.weather.gov/LosAngeles

MW

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
522 PM PST Wed Dec 11 2024

.SYNOPSIS...11/202 PM.

A couple of storm systems will move through the area, Thursday and
again later Saturday. Amounts will be light, except briefly heavy
in northwestern San Luis Obispo county Saturday. Temperatures
will mostly be a few degrees below normal, with slight warming
next week.

&&

.SHORT TERM (TDY-SAT)...11/145 PM.

Offshore winds continue to diminish today as a storm system moves
into northern California, causing pressure falls over the Great
Basin. As a result, all red flag warnings and high wind hazards
have been discontinued. There will continue to be some locally
gusty northeast winds to around 30 mph through early Thursday and
areas of very low humidities, but not meeting any hazard
criteria.

Once again it will be quite chilly tonight with sub-freezing
overnight lows across the interior valleys and other wind
protected areas.

A weakening and fast moving upper low will mostly pass north and
east of the area Thursday. A rapidly decaying frontal boundary
will drop some light rain across northern areas and possibly some
drizzle or very light rain south. Amounts expected to be a quarter
inch or so across northern SLO County and a tenth or less south.
And many areas south of Santa Barbara will receive little to no
rain. Temperatures will be 3-6 degrees cooler than today.

Following the frontal passage a strong west wind will develop
through the Santa Barbara Channel and outer coastal waters
bringing some gusty west to northwest winds to the coastal areas
south of Pt Conception and the Santa Ynez range during the
afternoon and evening.

A little warmer Friday under a quick little pop up ridge in
between low pressure systems.

A second fast moving system Saturday into Saturday night will
have a slightly farther south trajectory and stronger southerly
winds with it which will provide higher rain rates and amounts
across northwest SLO County. Models are showing 50-60kt south to
southwest winds at 850 mb as it approaches the Central Coast late
Saturday morning with precipitable water close to 1". However, the
front will be moving very fast and the duration of rain will
likely not exceed 3 hours in any one location. Still, northwest
SLO County could get a quick inch of rain or locally more in that
period which could create some brief ponding of water on the roads
in that area.

The front will be weakening quickly as it moves through the area,
with rain totals tapering down to a third of an inch across
northern SBA County and likely a tenth or less across LA/Ventura
Counties.

.LONG TERM (SUN-WED)...11/201 PM.

Chances for rain will return again on later Monday with another
weak system that likely will peter out before it reaches Santa
Barbara. Rain amounts will be quarter inch or less. Otherwise next
week looks dry with likely another Santa Ana wind event around
Wednesday. While the deterministic runs keep the preceding upper
trough farther east with offshore gradients only around -5 with
minimal upper support, there are at least 20-30% of ensemble
members that show the upper low making a closer path through the
Great Basin which could create a stronger offshore flow than the
deterministic models are currently showing.

Overall temperatures will be slowly warming through the period
with high by mid week in the low to mid 70s in the valleys and mod
to upper 60s closer to the coast.

&&

.AVIATION...12/0120Z.

At 00Z at KLAX, there was a no marine layer. There was a sfc-based
inversion up to 1200 ft and a temperature of 19 C.

Medium to high confidence in TAFs. Timing of rain chances and cat
changes could be off by +/- 2 hours. There is a 30% chance for
minimum forecast cig/vsby restrictions to be off by one category.
Rain will become much more spotty as the front moves south of Pt.
Conception, however there is a 20% chance for rain along with MVFR
cigs for locations to the south after 18Z Thursday. High
confidence in VFR conditions at desert TAFs.

KLAX...Medium to high confidence in TAF. There is a 20% chance for
light rain and BKN012-025 cigs to occur after 18Z Thursday. There
is a 30% chance for an east wind component to reach 8 kt between
06Z and 18Z on Thursday.

KBUR...Medium to high confidence in TAF. There is a 20% chance for
light rain and BKN012-025 cigs to occur after 18Z Thursday.

&&

.MARINE...11/226 PM.

A frontal system will bring hazardous winds and seas to most of
the coastal waters for Thursday.

For the Inner Waters north of Pt. Sal, Small Craft Advisory (SCA)
conditions are forecast to develop on Thursday and continue
through Thursday evening, and then there is a 60% chance for SCA
conditions to persist through Friday and re-develop over the
weekend.

For the Inner Waters south of Pt. Sal, SCA conditions are
forecast to develop early Thursday and continue through Thursday
afternoon, with GALE-FORCE winds expected over the Santa Barbara
Channel on Thursday. There is a 30% chance for SCA winds to
continue over the Santa Barbara Channel Thursday evening, and then
SCA conditions are unlikely afterward.

For the Outer Waters, SCA conditions are forecast to begin
developing late tonight with GALE-FORCE winds expected over the
central/southern Outer Waters for Thursday. There is at least an
80% chance for SCA winds to continue later in the week through
the weekend and into next week.

&&

.FIRE WEATHER...11/1233 PM.

All Red Flag Warnings will end early as winds have decreased
faster than expected. While very dry air and elevated fire
weather conditions will persist into tonight, the threat of
critical fire weather conditions have ended.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Advisory in effect from 4 PM Thursday to 4 PM PST
      Sunday for zones 340-346-354. (See LAXCFWLOX).
     Beach Hazards Statement in effect from Thursday afternoon
      through Sunday afternoon for zones 349-350-362-366. (See LAXCFWLOX).
PZ...Small Craft Advisory in effect from 10 AM to 10 PM PST
      Thursday for zones 645-655. (See LAXMWWLOX).
     Small Craft Advisory in effect from 1 AM to 10 AM PST
      Thursday for zones 650-673-676. (See LAXMWWLOX).
     Gale Warning in effect from 10 AM to 10 PM PST Thursday for
      zones 650-673-676. (See LAXMWWLOX).
     Small Craft Advisory in effect from 4 AM to 10 PM PST
      Thursday for zone 670. (See LAXMWWLOX).

&&

PUBLIC...MW
AVIATION...Lund
MARINE...Cohen
FIRE...Kittell
SYNOPSIS...MW

weather.gov/losangeles

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