Alert archive / California / Red Flag Warnings in 2007

Red Flag Warning 7, NWS Las Vegas, NV

May 4, 2007San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this red flag warning at May 4, 2007, 3:48 AM PDT for San Bernardino County, California; Mohave County, Arizona. It took effect at May 4, 2007, 10:00 AM PDT. It was in force for 10 hr. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 4, 2007, 3:48 AM PDT (10:48 UTC)
In effect from
May 4, 2007, 10:00 AM PDT
Expired
May 4, 2007, 8:00 PM PDT
In force
10 hr
Issued by
NWS Las Vegas, NV

Counties Mohave County, AZ, San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 48 km from the middle of the area, began a volume at 10:49 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.

What was reported inside it

TimeReportWhereRemark
May 4, 11:58 AM PDTNON-TSTM WND GST 45Kingman, AZ
May 4, 3:40 PM PDTNON-TSTM WND GST 58Daggett, CA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 10.8 hours before the alert went out and 176 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, Mercury/Desert R, NV at 00:00Z on 2007-05-04Temperature 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, Mercury/Desert R, NV at 00:00Z on 2007-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.1939587897Sfc1 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
4672 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
20 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.

000 
WWUS85 KVEF 041048
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
348 AM PDT FRI MAY 4 2007

AZZ102-CAZ228-042300-
/O.UPG.KVEF.FW.A.0004.070504T1600Z-070505T0300Z/
/O.NEW.KVEF.FW.W.0007.070504T1700Z-070505T0300Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT-
348 AM PDT FRI MAY 4 2007 /348 AM MST FRI MAY 4 2007/

...RED FLAG WARNING IN EFFECT FROM 10 AM PDT /10 AM MST/ THIS
MORNING TO 8 PM PDT /8 PM MST/ THIS EVENING FOR THE SAN 
BERNARDINO COUNTY DESERTS AND THE NORTHWEST DESERTS OF ARIZONA...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 10 AM PDT /10 AM MST/ THIS
MORNING TO 8 PM PDT /8 PM MST/ THIS EVENING. THE FIRE WEATHER
WATCH IS NO LONGER IN EFFECT. 

A STRONG PACIFIC STORM MOVING INTO THE GREAT BASIN WILL PRODUCE
STRONG WEST TO SOUTHWEST WINDS ACROSS THE SAN BERNARDINO COUNTY
DESERTS AND THE NORTHWEST DESERTS OF ARIZONA THROUGH THIS EVENING.
SUSTAINED 20 FOOT WINDS BETWEEN 20 AND 30 MPH WITH GUSTS BETWEEN
40 AND 50 MPH. RELATIVE HUMIDITY VALUES COULD REMAIN ABOVE 15
PERCENT IN WESTERN SAN BERNARDINO COUNTY BUT SHOULD DROP BELOW 15
PERCENT IN CENTRAL AND EASTERN SAN BERNARDINO COUNTY AND IN
SOUTHERN MOHAVE COUNTY.

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
EXPLOSIVE FIRE GROWTH POTENTIAL.

$$
2 follow-up statements
000 
WWUS85 KVEF 042122
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
222 PM PDT FRI MAY 4 2007

AZZ102-CAZ228-050300-
/O.CON.KVEF.FW.W.0007.000000T0000Z-070505T0300Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT-
222 PM PDT FRI MAY 4 2007 /222 PM MST FRI MAY 4 2007/

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

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

A STRONG PACIFIC STORM MOVING INTO THE GREAT BASIN HAS PRODUCED 
PRODUCED STRONG WEST TO SOUTHWEST WINDS ACROSS THE SAN BERNARDINO
COUNTY DESERTS AND MOHAVE COUNTY TODAY. SUSTAINED 20 FOOT WINDS
BETWEEN 20 AND 30 MPH WITH GUSTS BETWEEN 40 AND 50 MPH. RELATIVE
HUMIDITY VALUES COULD REMAIN ABOVE 15 PERCENT IN WESTERN SAN
BERNARDINO COUNTY BUT SHOULD DROP BELOW 15 PERCENT IN CENTRAL AND
EASTERN SAN BERNARDINO COUNTY AND IN SOUTHERN MOHAVE COUNTY.

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
EXPLOSIVE FIRE GROWTH POTENTIAL.

$$

PIERCE
000 
WWUS85 KVEF 050315
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
815 PM PDT FRI MAY 4 2007


AZZ102-CAZ228-050415-
/O.EXP.KVEF.FW.W.0007.000000T0000Z-070505T0300Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT-
815 PM PDT FRI MAY 4 2007 /815 PM MST FRI MAY 4 2007/

...RED FLAG WARNING HAS EXPIRED...

THE RED FLAG WARNING IS NO LONGER IN EFFECT. 

AUTOMATED SENSORS SHOWED THAT RELATIVE HUMIDITY VALUES HAVE
CLIMBED ABOVE 15 PERCENT AT MOST SITES ACROSS THE AREA. RELATIVE
HUMIDITY VALUES ARE EXPECTED TO CONTINUE TO INCREASE THROUGHOUT
THE NIGHT.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 2:35 PM PDTLake Wind AdvisoryVEFSan Bernardino24 hr

Nearby

Red Flag Warnings in California, 2007Red Flag Warnings in Arizona, 2007Every red flag warning in 2007

Sources

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