938
WWUS86 KLOX 192027
RFWLOX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
127 PM PDT Tue Aug 19 2025

...RED FLAG WARNING IN EFFECT FROM 9 AM PDT WEDNESDAY TO 9 PM PDT
SATURDAY FOR AN UNSEASONABLY HOT AND UNSTABLE AIR MASS CAPABLE OF
PRODUCING EXTREME FIRE BEHAVIOR FROM VERTICAL PLUME GROWTH... LOW
RELATIVE HUMIDITY...AND LOCALLY BREEZY WINDS FOR PORTIONS OF THE
MOUNTAINS AND FOOTHILLS OF LOS ANGELES AND VENTURA COUNTIES...

...RED FLAG WARNING IN EFFECT FROM 9 AM PDT THURSDAY TO 9 PM PDT
SATURDAY FOR AN UNSEASONABLY HOT AND UNSTABLE AIR MASS CAPABLE OF
PRODUCING EXTREME FIRE BEHAVIOR FROM VERTICAL PLUME GROWTH...LOW
RELATIVE HUMIDITY...AND LOCALLY BREEZY WINDS FOR PORTIONS OF THE
MOUNTAINS AND FOOTHILLS OF SANTA BARBARA AND SAN LUIS OBISPO
COUNTIES...

.A significant heatwave is on the way for late this week into
this weekend, bringing dangerous fire-weather conditions.

CAZ238-345-351>353-240400-
/O.UPG.KLOX.FW.A.0007.250821T1600Z-250824T0400Z/
/O.EXB.KLOX.FW.W.0005.250821T1600Z-250824T0400Z/
Cuyama Valley-San Luis Obispo County Mountains-
Santa Ynez Mountains Western Range-
Santa Ynez Mountains Eastern Range-
Santa Barbara County Interior Mountains-
127 PM PDT Tue Aug 19 2025

...RED FLAG WARNING IN EFFECT FROM 9 AM PDT THURSDAY TO 9 PM PDT
SATURDAY FOR AN UNSEASONABLY HOT AND UNSTABLE AIR MASS CAPABLE OF
PRODUCING EXTREME FIRE BEHAVIOR FROM VERTICAL PLUME GROWTH...LOW
RELATIVE HUMIDITY...AND LOCALLY BREEZY WINDS FOR PORTIONS OF THE
MOUNTAINS AND FOOTHILLS OF SANTA BARBARA AND SAN LUIS OBISPO
COUNTIES...

* TEMPERATURES...Unseasonably hot high temperatures, generally
  95-105 degrees, producing unseasonably unstable conditions.

* RELATIVE HUMIDITY...Minimum relative humidity 8-20 percent.

* THUNDERSTORMS...There is a less than 10 percent chance of
  isolated thunderstorms Friday through the weekend, and any
  accompanying lightning strikes will be capable of starting new
  fires on the peripheries of rain cores.

* WINDS...Diurnal wind patterns with speeds of 5-10 mph gusting
  to 10-15 mph, locally higher in wind-favored areas such as
  through passes and canyons.

* IMPACTS...If fire ignition occurs, conditions are favorable
  for extreme fire behavior and rapid fire growth, which could
  threaten life and property. Be aware of sudden re-direction of
  fires in response to passing outflow boundaries.

* ADDITIONAL DETAILS...Fire-weather headlines may eventually
  need to be extended into Sunday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that fire-weather conditions could
potentially become favorable for the development of extreme fire
behavior in the coming days. Use extreme caution with anything
that can spark a wildfire. Residents near wildland interfaces
should be prepared to evacuate if a wildfire breaks out. See
readyforwildfire.org and wildfirerisk.org for information.

&&

$$

CAZ288-375>382-240400-
/O.CON.KLOX.FW.W.0005.250820T1600Z-250824T0400Z/
Santa Clarita Valley-Santa Susana Mountains-
Southern Ventura County Mountains-
Northern Ventura County Mountains-Interstate 5 Corridor-
Western San Gabriel Mountains and Highway 14 Corridor-
Eastern San Gabriel Mountains-Western Antelope Valley Foothills-
Eastern Antelope Valley Foothills-
127 PM PDT Tue Aug 19 2025

...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM PDT WEDNESDAY TO
9 PM PDT SATURDAY FOR AN UNSEASONABLY HOT AND UNSTABLE AIR MASS
CAPABLE OF PRODUCING EXTREME FIRE BEHAVIOR FROM VERTICAL PLUME
GROWTH...LOW RELATIVE HUMIDITY...AND LOCALLY BREEZY WINDS FOR
PORTIONS OF THE MOUNTAINS AND FOOTHILLS OF LOS ANGELES AND VENTURA
COUNTIES...

* TEMPERATURES...Unseasonably hot high temperatures, generally
  95- 110 degrees and highest Thursday through Saturday,
  producing unseasonably unstable conditions.

* RELATIVE HUMIDITY...Minimum relative humidity 8-20 percent,
  lowest Wednesday and Thursday.

* THUNDERSTORMS...Isolated thunderstorms will be possible Friday
  through the weekend, and any accompanying lightning strikes
  will be capable of starting new fires on the peripheries of rain
  cores.

* WINDS...Southwest at 10-20 mph gusting to 20-25 mph over the
  western Antelope Valley Foothills and vicinity and in other
  wind- favored areas such as through passes and canyons.
  Lighter winds elsewhere. Passing outflow boundaries could
  bring sudden wind- shifts and increased fire-spread rates,
  even from distant thunderstorms.

* IMPACTS...If fire ignition occurs, conditions are favorable
  for extreme fire behavior and rapid fire growth, which could
  threaten life and property. Be aware of sudden re-direction of
  fires in response to passing outflow boundaries.

* ADDITIONAL DETAILS...Fire-weather headlines may eventually
  need to be extended into Sunday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that fire-weather conditions are
expected to be favorable for the development of extreme fire
behavior. Use extreme caution with anything that can spark a
wildfire. Residents near wildland interfaces should be prepared
to evacuate if a wildfire breaks out. See readyforwildfire.org
and wildfirerisk.org for information.

&&

$$

Cohen/Gomberg/Lund