Alert archive / California / Red Flag Warnings in 2012

Red Flag Warning 6, NWS Las Vegas, NV

April 1, 2012San Bernardino County, California; Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this red flag warning at Apr 1, 2012, 2:09 PM PDT for San Bernardino County, California; Mohave County, Arizona; Clark County, Nevada. It took effect at Apr 2, 2012, 10:00 AM PDT. It was in force for 9 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: Apr 1, 2012, 2:09 PM PDT (21:09 UTC)
In effect from: Apr 2, 2012, 10:00 AM PDT
Expired: Apr 2, 2012, 7:00 PM PDT
In force: 9 hr
Issued by: NWS Las Vegas, NV

Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV

The radar

The Las Vegas radar (KESX), 15 km from the middle of the area, began a volume at 21:10 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

Las Vegas, NV (KVEF), launched 12:00Z, 9.2 hours before the alert went out and 101 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2061 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: -105 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

242 
WWUS85 KVEF 012109
RFWVEF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAS VEGAS NV
209 PM PDT SUN APR 1 2012

...RED FLAG WARNING FOR TODAY HAS BEEN CANCELLED...

.STRONG NORTH WINDS...RELATIVE HUMIDITY VALUES LESS THAN 15
PERCENT AND DRY FUELS WILL LEAD TO THE POTENTIAL OF ERRATIC FIRE
BEHAVIOR MONDAY.

AZZ101-CAZ229-NVZ466-021400-
/O.CAN.KVEF.FW.W.0005.000000T0000Z-120403T0300Z/
/O.NEW.KVEF.FW.W.0006.120402T1700Z-120403T0300Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY-
LAKE MEAD NRA/COLORADO RIVER-NV SIDE-
209 PM PDT SUN APR 1 2012 /209 PM MST SUN APR 1 2012/

...RED FLAG WARNING IN EFFECT FROM 10 AM PDT /10 AM MST/ TO 8 PM
PDT /8 PM MST/ MONDAY FOR STRONG WINDS AND LOW RELATIVE HUMIDITY
FOR FIRE WEATHER ZONES 101...229 AND 466...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG
WARNING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY...WHICH IS IN
EFFECT FROM 10 AM PDT /10 AM MST/ TO 8 PM PDT /8 PM MST/ MONDAY.

THE RED FLAG WARNING FOR TODAY HAS BEEN CANCELLED. 

* AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 101 LAKE MEAD 
  NRA/COLORADO RIVER-AZ SIDE. IN CALIFORNIA...FIRE WEATHER ZONE 
  229 LOWER COLORADO RIVER VALLEY. IN NEVADA...FIRE WEATHER ZONE 
  466 LAKE MEAD NRA/COLORADO RIVER-NV SIDE. 

* TIMING...GUSTY NORTH WINDS WILL DEVELOP MONDAY MORNING WITH
  RELATIVE HUMIDITY VALUES DROPPING TO BELOW 15 PERCENT BY LATE
  MORNING. WINDS WILL DECREASE EARLY MONDAY EVENING.

* WIND...NORTH WIND 25 TO 35 MPH WITH GUSTS TO 55 MPH.

* HUMIDITY...LOWERING TO BETWEEN 10 AND 15 PERCENT.

* IMPACTS...THE COMBINATION OF STRONG WINDS...LOW HUMIDITY AND 
  DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR 
  EXTREME FIRE BEHAVIOR. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG
WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE
EXTREME FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/LASVEGAS

PIERCE

3 follow-up statements

058 
WWUS85 KVEF 021108
RFWVEF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAS VEGAS NV
408 AM PDT MON APR 2 2012

.STRONG NORTH WINDS...RELATIVE HUMIDITY VALUES LESS THAN
15 PERCENT AND DRY FUELS WILL LEAD TO THE POTENTIAL FOR EXTREME
FIRE BEHAVIOR MONDAY.

AZZ102-030200-
/O.EXB.KVEF.FW.W.0006.120402T1700Z-120403T0200Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-
408 AM MST MON APR 2 2012

...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 7 PM MST
THIS EVENING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE
WEATHER ZONE 102...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG
WARNING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY...WHICH IS IN
EFFECT FROM 10 AM THIS MORNING TO 7 PM MST THIS EVENING. 

* AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 102 NORTHWEST 
  DESERTS/NORTHWEST PLATEAU.

* TIMING...WINDS WILL INCREASE THIS MORNING...PEAK THIS AFTERNOON
  THEN DIMINISH EARLY THIS EVENING. RELATIVE HUMIDITY WILL DROP
  BELOW 15 PERCENT BY LATE MORNING OVER MUCH OF THE AREA.

* WIND...NORTH WIND 20 TO 30 MPH WITH GUSTS TO 50 MPH.

* HUMIDITY...10 TO 15 PERCENT LATE THIS MORNING THROUGH EARLY
  EVENING. 

* IMPACTS...THE COMBINATION OF STRONG WINDS...LOW HUMIDITY AND 
  DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR 
  EXTREME FIRE BEHAVIOR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG
WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE
EXTREME FIRE GROWTH POTENTIAL.

&&

$$

AZZ101-CAZ229-NVZ466-030300-
/O.CON.KVEF.FW.W.0006.120402T1700Z-120403T0300Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY-
LAKE MEAD NRA/COLORADO RIVER-NV SIDE-
408 AM PDT MON APR 2 2012 /408 AM MST MON APR 2 2012/

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM PDT /10 AM MST/
THIS MORNING TO 8 PM PDT /8 PM MST/ THIS EVENING FOR STRONG WINDS
AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 101...229 AND
466...

A RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM PDT /10 AM MST/
THIS MORNING TO 8 PM PDT /8 PM MST/ THIS EVENING. 

* AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 101 LAKE MEAD 
  NRA/COLORADO RIVER-AZ SIDE. IN CALIFORNIA...FIRE WEATHER ZONE 
  229 LOWER COLORADO RIVER VALLEY. IN NEVADA...FIRE WEATHER ZONE 
  466 LAKE MEAD NRA/COLORADO RIVER-NV SIDE. 

* TIMING...NORTH WINDS WILL INCREASE THIS MORNING WITH RELATIVE
  HUMIDITY VALUES DROPPING TO BELOW 15 PERCENT BY LATE MORNING.
  WINDS WILL DECREASE EARLY THIS EVENING.

* WIND...NORTH WIND 25 TO 35 MPH WITH GUSTS TO 55 MPH.

* HUMIDITY...LOWERING TO BETWEEN 10 AND 15 PERCENT.

* IMPACTS...THE COMBINATION OF STRONG WINDS...LOW HUMIDITY AND 
  DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR 
  EXTREME FIRE BEHAVIOR. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG
WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE
EXTREME FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/LASVEGAS

288 
WWUS85 KVEF 021825
RFWVEF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAS VEGAS NV
1125 AM PDT MON APR 2 2012

.STRONG NORTH WINDS...RELATIVE HUMIDITY VALUES LESS THAN
15 PERCENT AND DRY FUELS WILL LEAD TO THE POTENTIAL FOR EXTREME
FIRE BEHAVIOR TODAY.

AZZ101-CAZ229-NVZ466-030300-
/O.CON.KVEF.FW.W.0006.000000T0000Z-120403T0300Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY-
LAKE MEAD NRA/COLORADO RIVER-NV SIDE-
1125 AM PDT MON APR 2 2012 /1125 AM MST MON APR 2 2012/

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/
THIS EVENING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE
WEATHER ZONES 101...229 AND 466...

A RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/
THIS EVENING. 

* AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 101 LAKE MEAD 
  NRA/COLORADO RIVER-AZ SIDE. IN CALIFORNIA...FIRE WEATHER ZONE 
  229 LOWER COLORADO RIVER VALLEY. IN NEVADA...FIRE WEATHER ZONE 
  466 LAKE MEAD NRA/COLORADO RIVER-NV SIDE. 

* TIMING...NORTH WINDS WILL CONTINUE WITH RELATIVE HUMIDITY VALUES
  BELOW 15 PERCENT. WINDS WILL DECREASE EARLY THIS EVENING WHILE
  HUMIDITY VALUES SLOWLY START TO RISE.

* WIND...NORTH WIND 25 TO 35 MPH WITH GUSTS TO 55 MPH.

* HUMIDITY...LOWERING TO BETWEEN 10 AND 15 PERCENT.

* IMPACTS...THE COMBINATION OF STRONG WINDS...LOW HUMIDITY AND 
  DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR 
  EXTREME FIRE BEHAVIOR. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG
WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE
EXTREME FIRE GROWTH POTENTIAL.

&&

$$

AZZ102-030200-
/O.CON.KVEF.FW.W.0006.000000T0000Z-120403T0200Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-
1125 AM MST MON APR 2 2012

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING
FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE
102...

A RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING
FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE
102.

* AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 102 NORTHWEST 
  DESERTS/NORTHWEST PLATEAU. 

* TIMING...WIND SPEED WILL PEAK THIS AFTERNOON THEN DIMINISH EARLY
  THIS EVENING. RELATIVE HUMIDITY WILL REMAIN BELOW 15 PERCENT
  THROUGH THIS EVENING BEFORE SLOWLY RECOVERING TONIGHT.

* WIND...NORTH WIND 20 TO 30 MPH WITH GUSTS TO 50 MPH.

* HUMIDITY...10 TO 15 PERCENT LATE THIS MORNING THROUGH EARLY 
  EVENING. 

* IMPACTS...THE COMBINATION OF STRONG WINDS...LOW HUMIDITY AND 
  DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR 
  EXTREME FIRE BEHAVIOR. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG
WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE
EXTREME FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/LASVEGAS

649 
WWUS85 KVEF 030133
RFWVEF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAS VEGAS NV
633 PM PDT MON APR 2 2012

AZZ101-CAZ229-NVZ466-030245-
/O.CAN.KVEF.FW.W.0006.000000T0000Z-120403T0300Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY-
LAKE MEAD NRA/COLORADO RIVER-NV SIDE-
633 PM PDT MON APR 2 2012 /633 PM MST MON APR 2 2012/

...RED FLAG WARNING IS CANCELLED FOR STRONG WINDS AND LOW
RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 101 - 229 AND 466...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS CANCELLED THE RED
FLAG WARNING FOR THE LAKE MEAD NATIONAL RECREATION AREA AND THE
COLORADO RIVER VALLEY.

WINDS HAD SUBSIDED EARLY THIS EVENING...SO THE RED FLAG WARNING
HAS BEEN CANCELLED.

$$

AZZ102-030245-
/O.EXP.KVEF.FW.W.0006.000000T0000Z-120403T0200Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-
633 PM MST MON APR 2 2012

...RED FLAG WARNING WILL EXPIRE AT 7 PM MST THIS EVENING FOR
STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE
102...

THE RED FLAG WARNING FOR MUCH OF MOHAVE COUNTY WILL EXPIRE AT 7
PM MST THIS EVENING.

WINDS HAD SUBSIDED EARLY THIS EVENING...SO THE RED FLAG WARNING
WILL BE ALLOWED TO EXPIRE.

$$

MORGAN

HTTP://WEATHER.GOV/LASVEGAS

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 1, 3:57 AM PDT	High Wind Watch	VEF	San Bernardino	10 hr
Apr 1, 2:00 PM PDT	Wind Advisory	VEF	San Bernardino	29 hr

Nearby

Red Flag Warnings in California, 2012 Red Flag Warnings in Arizona, 2012 Red Flag Warnings in Nevada, 2012 Every red flag warning in 2012

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.