557
FNUS86 KLOX 171611
FWLLOX

ECCDA Discussions
National Weather Service Los Angeles/Oxnard CA
911 AM PDT Sun Aug 17 2025

ECC029-181015-
Los Padres National Forest-
Discussion for Vandenberg ECC Dispatch
911 AM PDT Sun Aug 17 2025

...Discussion from Monterey...

Slightly reduced cloud cover and cooler temperatures are expected
today and Monday in the way of a cold front. Temperatures begin to
warm again into the mid week as an upper  level ridge build across
the region. This warming will mostly be affecting the interior areas
as the marine layer stays intact, but does compress. This will be
most noticeable for sites above 2000  ft in elevation where poor
daytime humidity retention and poor  overnight recoveries will
persist for much of the upcoming week. The current forecast shows
peak warming and drying on Thursday and Friday, but conditions may
be slow to improve as onshore flow will only slightly increase into
the weekend.


Note : All winds are 20-foot Winds Unless otherwise specified.
Thunderstorms imply strong, gusty and erratic winds.



...Discussion from Los Angeles/Oxnard...

...LONG DURATION HEATWAVE WITH WIDESPREAD ELEVATED FIRE WEATHER
CONDITIONS INCLUDING POTENTIAL FOR LARGE PLUME DOMINATED FIRES AWAY
FROM THE COAST FROM WEDNESDAY THROUGH SUNDAY...

A weak upper level trough over the region combined with strong
onshore flow will continue to bring mild conditions across the
region today. There will be gradual warming and drying across the
interior on Monday and Tuesday as upper level high pressure begins
to expand westward. There will be  gusty Sundowner winds the next
few evenings, mainly focused from Gaviota to San Marcos Pass. Wind
gusts of 35 to 50 mph will be common each evening. While humidity
levels will be elevated this evening, but could lower into the 20 to
40 percent range on Monday evening and Tuesday evening, thereby
increasing the fire weather concerns for southwest Santa Barbara
county.

A long duration heat wave is becoming more likely from Wednesday
through Sunday. With onshore flow expected to be weaker with this
event, heat impacts could potentially spread to inland portions of
the coastal plain. The combination of hot temperatures, low
humidities (including poor overnight recoveries in the mountains and
foothills), and critically dry fuels away from the coast, will
likely bring widespread elevated fire weather conditions across the
valleys, mountains.During the peak of the heatwave, which will
likely be Thursday through Saturday, temperatures could soar to
between 98 and 108 degrees for the valleys, lower mountains, and
deserts, with minimum humidities generally ranging between 8 and 20
percent, and mixing heights potentially rising to between 12,000 and
17,000 feet across the interior. While widespread strong winds are
not anticipated with this upcoming heat wave, the hot temperatures,
low humidities, increased instability, locally gusty winds(mainly
across mountains, foothills, and canyons), and critically dry fuels
will bring the threat of large plume dominated fires (especially in
the mountains and foothills), capable of rapid growth and extreme
fire behavior. As a result, Fire Weather Watch issuances will be
considered for portions of the interior later today and tomorrow.


$$

ECC028-181015-
Santa Barbara County excluding Los Padres National Forest-
Discussion for Santa Barbara ECC Dispatch
911 AM PDT Sun Aug 17 2025

...LONG DURATION HEATWAVE WITH WIDESPREAD ELEVATED FIRE WEATHER
CONDITIONS INCLUDING POTENTIAL FOR LARGE PLUME DOMINATED FIRES AWAY
FROM THE COAST FROM WEDNESDAY THROUGH SUNDAY...

A weak upper level trough over the region combined with strong
onshore flow will continue to bring mild conditions across the
region today. There will be gradual warming and drying across the
interior on Monday and Tuesday as upper level high pressure begins
to expand westward. There will be  gusty Sundowner winds the next
few evenings, mainly focused from Gaviota to San Marcos Pass. Wind
gusts of 35 to 50 mph will be common each evening. While humidity
levels will be elevated this evening, but could lower into the 20 to
40 percent range on Monday evening and Tuesday evening, thereby
increasing the fire weather concerns for southwest Santa Barbara
county.

A long duration heat wave is becoming more likely from Wednesday
through Sunday. With onshore flow expected to be weaker with this
event, heat impacts could potentially spread to inland portions of
the coastal plain. The combination of hot temperatures, low
humidities (including poor overnight recoveries in the mountains and
foothills), and critically dry fuels away from the coast, will
likely bring widespread elevated fire weather conditions across the
valleys, mountains.During the peak of the heatwave, which will
likely be Thursday through Saturday, temperatures could soar to
between 98 and 108 degrees for the valleys, lower mountains, and
deserts, with minimum humidities generally ranging between 8 and 20
percent, and mixing heights potentially rising to between 12,000 and
17,000 feet across the interior. While widespread strong winds are
not anticipated with this upcoming heat wave, the hot temperatures,
low humidities, increased instability, locally gusty winds(mainly
across mountains, foothills, and canyons), and critically dry fuels
will bring the threat of large plume dominated fires (especially in
the mountains and foothills), capable of rapid growth and extreme
fire behavior. As a result, Fire Weather Watch issuances will be
considered for portions of the interior later today and tomorrow.


$$

ECC031-181015-
Angeles National Forest-
Discussion for Lancaster ECC Dispatch
911 AM PDT Sun Aug 17 2025

...LONG DURATION HEATWAVE WITH WIDESPREAD ELEVATED FIRE WEATHER
CONDITIONS INCLUDING POTENTIAL FOR LARGE PLUME DOMINATED FIRES AWAY
FROM THE COAST FROM WEDNESDAY THROUGH SUNDAY...

A weak upper level trough over the region combined with strong
onshore flow will continue to bring mild conditions across the
region today. There will be gradual warming and drying across the
interior on Monday and Tuesday as upper level high pressure begins
to expand westward. There will be  gusty Sundowner winds the next
few evenings, mainly focused from Gaviota to San Marcos Pass. Wind
gusts of 35 to 50 mph will be common each evening. While humidity
levels will be elevated this evening, but could lower into the 20 to
40 percent range on Monday evening and Tuesday evening, thereby
increasing the fire weather concerns for southwest Santa Barbara
county.

A long duration heat wave is becoming more likely from Wednesday
through Sunday. With onshore flow expected to be weaker with this
event, heat impacts could potentially spread to inland portions of
the coastal plain. The combination of hot temperatures, low
humidities (including poor overnight recoveries in the mountains and
foothills), and critically dry fuels away from the coast, will
likely bring widespread elevated fire weather conditions across the
valleys, mountains.During the peak of the heatwave, which will
likely be Thursday through Saturday, temperatures could soar to
between 98 and 108 degrees for the valleys, lower mountains, and
deserts, with minimum humidities generally ranging between 8 and 20
percent, and mixing heights potentially rising to between 12,000 and
17,000 feet across the interior. While widespread strong winds are
not anticipated with this upcoming heat wave, the hot temperatures,
low humidities, increased instability, locally gusty winds(mainly
across mountains, foothills, and canyons), and critically dry fuels
will bring the threat of large plume dominated fires (especially in
the mountains and foothills), capable of rapid growth and extreme
fire behavior. As a result, Fire Weather Watch issuances will be
considered for portions of the interior later today and tomorrow.


$$

ECC024-181015-
San Luis Obispo County-
Discussion for San Luis Obispo ECC Dispatch
911 AM PDT Sun Aug 17 2025

...LONG DURATION HEATWAVE WITH WIDESPREAD ELEVATED FIRE WEATHER
CONDITIONS INCLUDING POTENTIAL FOR LARGE PLUME DOMINATED FIRES AWAY
FROM THE COAST FROM WEDNESDAY THROUGH SUNDAY...

A weak upper level trough over the region combined with strong
onshore flow will continue to bring mild conditions across the
region today. There will be gradual warming and drying across the
interior on Monday and Tuesday as upper level high pressure begins
to expand westward. There will be  gusty Sundowner winds the next
few evenings, mainly focused from Gaviota to San Marcos Pass. Wind
gusts of 35 to 50 mph will be common each evening. While humidity
levels will be elevated this evening, but could lower into the 20 to
40 percent range on Monday evening and Tuesday evening, thereby
increasing the fire weather concerns for southwest Santa Barbara
county.

A long duration heat wave is becoming more likely from Wednesday
through Sunday. With onshore flow expected to be weaker with this
event, heat impacts could potentially spread to inland portions of
the coastal plain. The combination of hot temperatures, low
humidities (including poor overnight recoveries in the mountains and
foothills), and critically dry fuels away from the coast, will
likely bring widespread elevated fire weather conditions across the
valleys, mountains.During the peak of the heatwave, which will
likely be Thursday through Saturday, temperatures could soar to
between 98 and 108 degrees for the valleys, lower mountains, and
deserts, with minimum humidities generally ranging between 8 and 20
percent, and mixing heights potentially rising to between 12,000 and
17,000 feet across the interior. While widespread strong winds are
not anticipated with this upcoming heat wave, the hot temperatures,
low humidities, increased instability, locally gusty winds(mainly
across mountains, foothills, and canyons), and critically dry fuels
will bring the threat of large plume dominated fires (especially in
the mountains and foothills), capable of rapid growth and extreme
fire behavior. As a result, Fire Weather Watch issuances will be
considered for portions of the interior later today and tomorrow.


$$

ECC032-181015-
Ventura County excluding Los Padres National Forest-
Discussion for Ventura ECC Dispatch
911 AM PDT Sun Aug 17 2025

...LONG DURATION HEATWAVE WITH WIDESPREAD ELEVATED FIRE WEATHER
CONDITIONS INCLUDING POTENTIAL FOR LARGE PLUME DOMINATED FIRES AWAY
FROM THE COAST FROM WEDNESDAY THROUGH SUNDAY...

A weak upper level trough over the region combined with strong
onshore flow will continue to bring mild conditions across the
region today. There will be gradual warming and drying across the
interior on Monday and Tuesday as upper level high pressure begins
to expand westward. There will be  gusty Sundowner winds the next
few evenings, mainly focused from Gaviota to San Marcos Pass. Wind
gusts of 35 to 50 mph will be common each evening. While humidity
levels will be elevated this evening, but could lower into the 20 to
40 percent range on Monday evening and Tuesday evening, thereby
increasing the fire weather concerns for southwest Santa Barbara
county.

A long duration heat wave is becoming more likely from Wednesday
through Sunday. With onshore flow expected to be weaker with this
event, heat impacts could potentially spread to inland portions of
the coastal plain. The combination of hot temperatures, low
humidities (including poor overnight recoveries in the mountains and
foothills), and critically dry fuels away from the coast, will
likely bring widespread elevated fire weather conditions across the
valleys, mountains.During the peak of the heatwave, which will
likely be Thursday through Saturday, temperatures could soar to
between 98 and 108 degrees for the valleys, lower mountains, and
deserts, with minimum humidities generally ranging between 8 and 20
percent, and mixing heights potentially rising to between 12,000 and
17,000 feet across the interior. While widespread strong winds are
not anticipated with this upcoming heat wave, the hot temperatures,
low humidities, increased instability, locally gusty winds(mainly
across mountains, foothills, and canyons), and critically dry fuels
will bring the threat of large plume dominated fires (especially in
the mountains and foothills), capable of rapid growth and extreme
fire behavior. As a result, Fire Weather Watch issuances will be
considered for portions of the interior later today and tomorrow.


$$

ECC030-181015-
Los Angeles County excluding Angeles National Forest-
Discussion for Los Angeles ECC Dispatch
911 AM PDT Sun Aug 17 2025

...LONG DURATION HEATWAVE WITH WIDESPREAD ELEVATED FIRE WEATHER
CONDITIONS INCLUDING POTENTIAL FOR LARGE PLUME DOMINATED FIRES AWAY
FROM THE COAST FROM WEDNESDAY THROUGH SUNDAY...

A weak upper level trough over the region combined with strong
onshore flow will continue to bring mild conditions across the
region today. There will be gradual warming and drying across the
interior on Monday and Tuesday as upper level high pressure begins
to expand westward. There will be  gusty Sundowner winds the next
few evenings, mainly focused from Gaviota to San Marcos Pass. Wind
gusts of 35 to 50 mph will be common each evening. While humidity
levels will be elevated this evening, but could lower into the 20 to
40 percent range on Monday evening and Tuesday evening, thereby
increasing the fire weather concerns for southwest Santa Barbara
county.

A long duration heat wave is becoming more likely from Wednesday
through Sunday. With onshore flow expected to be weaker with this
event, heat impacts could potentially spread to inland portions of
the coastal plain. The combination of hot temperatures, low
humidities (including poor overnight recoveries in the mountains and
foothills), and critically dry fuels away from the coast, will
likely bring widespread elevated fire weather conditions across the
valleys, mountains.During the peak of the heatwave, which will
likely be Thursday through Saturday, temperatures could soar to
between 98 and 108 degrees for the valleys, lower mountains, and
deserts, with minimum humidities generally ranging between 8 and 20
percent, and mixing heights potentially rising to between 12,000 and
17,000 feet across the interior. While widespread strong winds are
not anticipated with this upcoming heat wave, the hot temperatures,
low humidities, increased instability, locally gusty winds(mainly
across mountains, foothills, and canyons), and critically dry fuels
will bring the threat of large plume dominated fires (especially in
the mountains and foothills), capable of rapid growth and extreme
fire behavior. As a result, Fire Weather Watch issuances will be
considered for portions of the interior later today and tomorrow.


$$