Alert archive / California / Red Flag Warnings in 2017

Red Flag Warning 2, NWS Los Angeles, CA

June 25, 2017Los Angeles County, California

NWS Los Angeles, CA issued this red flag warning at Jun 25, 2017, 8:37 PM PDT for Los Angeles County, California. It took effect at Jun 26, 2017, 9:00 AM PDT. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 25, 2017, 8:37 PM PDT (03:37 UTC)
In effect from
Jun 26, 2017, 9:00 AM PDT
Expired
Jun 26, 2017, 9:00 PM PDT
In force
12 hr
Issued by
NWS Los Angeles, CA

County Los Angeles County, CA

The radar

The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 03:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 3.6 hours before the alert went out and 184 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, San Diego, CA at 00:00Z on 2017-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 00:00Z on 2017-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -41 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3359 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-41 m²/s²
0-3 km storm-relative helicity
-2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

380 
WWUS86 KLOX 260337
RFWLOX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
837 PM PDT Sun Jun 25 2017

...RED FLAG WARNING IN EFFECT FROM 9 AM TO 9 PM PDT MONDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE SANTA CLARITA AND ANTELOPE
VALLEYS AS WELL AS THE LOS ANGELES COUNTY MOUNTAINS...

.A hot and dry air mass will combine with gusty onshore winds on
Monday and Monday evening to produce critical fire weather
conditions across the Santa Clarita and Antelope Valleys as well
as the Los Angeles County Mountains.

CAZ254-288-261630-
/O.NEW.KLOX.FW.W.0002.170626T1600Z-170627T0400Z/
Los Angeles County Mountains / Angeles National Forest-
Santa Clarita Valley-
837 PM PDT Sun Jun 25 2017

...RED FLAG WARNING IN EFFECT FROM 9 AM TO 9 PM PDT MONDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE LOS ANGELES COUNTY
MOUNTAINS AND SANTA CLARITA VALLEY...

THE NATIONAL WEATHER SERVICE IN LOS ANGELES/OXNARD HAS ISSUED A 
RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE LOS 
ANGELES COUNTY MOUNTAINS AND THE SANTA CLARITA VALLEY. THIS 
WARNING IS IN EFFECT FROM 9 AM TO 9 PM PDT MONDAY.

* Winds...Southwest winds will increase to 15 to 25 mph with gusts
  to 35 mph on Monday morning and remain gusty through Monday
  evening. Local southwest winds will increase to 20 to 30 mph 
  with gusts to 45 mph over the interior foothills into the 
  Antelope Valley.

* Relative Humidity...Humidities will fall to generally between 6
  to 13 percent on Monday and remain below critical humidity 
  through Monday evening.

* Impacts...If fire ignition occurs, conditions are favorable for
  extreme fire behavior which would threaten life and property.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

CAZ259-261630-
/O.NEW.KLOX.FW.W.0002.170626T1600Z-170627T0400Z/
Antelope Valley-
837 PM PDT Sun Jun 25 2017

...RED FLAG WARNING IN EFFECT FROM 9 AM TO 9 PM PDT MONDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE ANTELOPE VALLEY...

THE NATIONAL WEATHER SERVICE IN LOS ANGELES/OXNARD HAS ISSUED A 
RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE 
ANTELOPE VALLEY. THIS WARNING IS IN EFFECT FROM 9 AM to 9 PM PDT 
MONDAY.

* Winds...Southwest winds will increase to 15 to 30 mph with gusts
  to 40 mph on Monday morning and remain gusty through Monday
  evening. Winds may be locally stronger near the foothills of 
  the Antelope Valley.

* Relative Humidity...Humidities will fall to generally between 3
  to 10 percent on Monday and remain below critical humidity
  through Monday evening.

* Impacts...If fire ignition occurs, conditions are favorable for
  extreme fire behavior which would threaten life and property.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

Hall/CK
2 follow-up statements
154 
WWUS86 KLOX 261627
RFWLOX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
927 AM PDT Mon Jun 26 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING 
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SANTA CLARITA AND 
ANTELOPE VALLEYS AS WELL AS THE LOS ANGELES COUNTY MOUNTAINS...

.A hot and dry air mass will combine with gusty west and southwest 
winds through this evening to produce critical fire weather 
conditions across the Santa Clarita and Antelope Valleys as well 
as the Los Angeles County Mountains.

CAZ254-288-270030-
/O.CON.KLOX.FW.W.0002.000000T0000Z-170627T0400Z/
Los Angeles County Mountains / Angeles National Forest-
Santa Clarita Valley-
927 AM PDT Mon Jun 26 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE LOS ANGELES COUNTY
MOUNTAINS AND SANTA CLARITA VALLEY...

* Winds...Southwest winds will increase to 15 to 25 mph with 
  gusts to 35 mph on Monday morning and remain gusty through 
  Monday evening. Local southwest winds will increase to 20 to 
  30 mph with gusts to 45 mph over the interior foothills into 
  the Antelope Valley. 

* Relative Humidity...Humidities will fall to generally between
  6 to 13 percent on Monday and remain below critical humidity 
  through Monday evening.

* Impacts...If fire ignition occurs, conditions are favorable 
  for extreme fire behavior which would threaten life and 
  property. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

CAZ259-270030-
/O.CON.KLOX.FW.W.0002.000000T0000Z-170627T0400Z/
Antelope Valley-
927 AM PDT Mon Jun 26 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE ANTELOPE VALLEY...

* Winds...Southwest winds will increase to 15 to 30 mph with 
  gusts to 40 mph on Monday morning and remain gusty through 
  Monday evening. Winds may be locally stronger near the 
  foothills of the Antelope Valley. 

* Relative Humidity...Humidities will fall to generally between
  3 to 10 percent on Monday and remain below critical humidity 
  through Monday evening.

* Impacts...If fire ignition occurs, conditions are favorable 
  for extreme fire behavior which would threaten life and 
  property. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$
913 
WWUS86 KLOX 270403
RFWLOX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
903 PM PDT Mon Jun 26 2017

...RED FLAG WARNING HAS EXPIRED FOR THE SANTA CLARITA VALLEY AS
WELL AS THE LOS ANGELES COUNTY MOUNTAINS AND ANTELOPE VALLEY...


CAZ254-259-288-270515-
/O.EXP.KLOX.FW.W.0002.000000T0000Z-170627T0400Z/
Los Angeles County Mountains / Angeles National Forest-
Antelope Valley-Santa Clarita Valley-
903 PM PDT Mon Jun 26 2017

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY...

Gusty onshore winds will continue to diminish tonight allowing
the Red Flag Warning to expire. However, very warm and dry
conditions coupled with a return of gusty onshore winds in the
afternoon hours will bring elevated fire danger to all interior 
sections on Tuesday.

$$

Gomberg

Nearby

Red Flag Warnings in California, 2017Every red flag warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.