Alert archive / Nevada / Red Flag Warnings in 2008

Red Flag Warning 13, NWS Las Vegas, NV

April 23, 2008Clark County, Lincoln County, Nye County, Nevada; San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this red flag warning at Apr 23, 2008, 5:20 AM PDT for Clark County, Lincoln County, Nye County, Nevada; San Bernardino County, California; Mohave County, Arizona. It took effect at Apr 23, 2008, 11:00 AM PDT. It was in force for 9 hr. 5 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: Apr 23, 2008, 5:20 AM PDT (12:20 UTC)
In effect from: Apr 23, 2008, 11:00 AM PDT
Expired: Apr 23, 2008, 8:00 PM PDT
In force: 9 hr
Issued by: NWS Las Vegas, NV

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

The radar

The Las Vegas radar (KESX), 94 km from the middle of the area, began a volume at 12:17 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

Time	Report	Where	Remark
Apr 23, 12:14 PM PDT	NON-TSTM WND GST 42	19 Nnw Lenwood, CA	MESONET RAWS, NAME OPAL MOUNTAIN.
Apr 23, 12:40 PM PDT	NON-TSTM WND GST 42	30 W Baker, CA	SITE CLR14, NAME 4-CORNERS.
Apr 23, 2:29 PM PDT	NON-TSTM WND GST 45	Daggett, CA	MEASURED AT KDAG.
Apr 23, 7:00 PM PDT	NON-TSTM WND GST 47	5 E Daggett, CA	PEAK GUST THROUGH 2300 PDT. SITE CLR11 MESONET. NAME, DAGGETT.
Apr 23, 8:10 PM PDT	NON-TSTM WND GST 49	30 W Baker, CA	PEAK GUST THROUGH 2300 PDT. SITE CLR14 MESONET, NAME, 4-CORNERS.

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 12:00Z, 0.3 hours before the alert went out and 68 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: 3451 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 95 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 231220
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
520 AM PDT WED APR 23 2008

...RED FLAG WARNING TODAY DUE TO GUSTY SOUTHWEST WINDS AND LOW
RELATIVE HUMIDITY...

.GUSTY SOUTHWEST WINDS WILL DEVELOP IN THE MOJAVE DESERT
THIS AFTERNOON AS AN AREA OF LOW PRESSURE MOVES THROUGH THE
INTERMOUNTAIN WEST. THE WIND WILL COMBINE WITH VERY LOW RELATIVE
HUMIDITY VALUES THAT CRITICAL FIRE WEATHER CONDITIONS WILL OCCUR.

AZZ102-CAZ228-NVZ463>465-240300-
/O.UPG.KVEF.FW.A.0009.080423T1800Z-080424T0300Z/
/O.NEW.KVEF.FW.W.0013.080423T1800Z-080424T0300Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT-SHEEP RANGE-
SPRING MOUNTAINS-
CLARK AND SW LINCOLN COUNTY DESERTS/LAS VEGAS DISPATCH-
520 AM PDT WED APR 23 2008 /520 AM MST WED APR 23 2008/

...RED FLAG WARNING IN EFFECT FROM 11 AM PDT/MST THIS MORNING TO
8 PM PDT/MST THIS EVENING...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 11 AM PDT/MST THIS MORNING TO 8
PM PDT/MST THIS EVENING. THE FIRE WEATHER WATCH HAS BEEN UPGRADED
TO A RED FLAG WARNING.

RELATIVE HUMIDITY RECOVERY HAS BEEN POOR OVERNIGHT WITH MOST
READINGS IN SOUTHERN NEVADA AND NORTHWEST ARIZONA BETWEEN 20 AND
30 PERCENT. RECOVERY HAS BEEN SLIGHTLY BETTER IN THE SOUTHERN
NEVADA MOUNTAINS AND SAN BERNARDINO COUNTY WITH READINGS BETWEEN
30 AND 40 PERCENT. SUSTAINED SOUTHWEST WINDS OF 20 TO 25 MPH WITH
GUST BETWEEN 35 AND 40 MPH WILL OCCUR ACROSS THE MOJAVE DESERT
THIS AFTERNOON AND EVENING WITH RELATIVE HUMIDITY VALUES IN THE
SINGLE DIGITS OR LOW TEENS.

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.

$$

PIERCE

1 follow-up statement

000
WWUS85 KVEF 240259
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
759 PM PDT WED APR 23 2008

AZZ102-CAZ228-NVZ463>465-240400-
/O.EXP.KVEF.FW.W.0013.000000T0000Z-080424T0300Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT-SHEEP RANGE-
SPRING MOUNTAINS-
CLARK AND SW LINCOLN COUNTY DESERTS/LAS VEGAS DISPATCH-
759 PM PDT WED APR 23 2008 /759 PM MST WED APR 23 2008/

...RED FLAG WARNING WILL EXPIRE AT 8 PM PDT /8 PM MST/ THIS
EVENING...

THE RED FLAG WARNING WILL EXPIRE AT 8 PM PDT /8 PM MST/ THIS
EVENING FOR THE NORTHWEST DESERTS/NORTHWEST PLATEAU...THE MOJAVE
DESERT...SHEEP RANGE...SPRING MOUNTAINS...CLARK AND SW LINCOLN
COUNTY DESERTS AND THE LAS VEGAS DISPATCH.

ALTHOUGH GUSTY WINDS WILL CONTINUE ESPECIALLY ACROSS THE SAN
BERNARDINO COUNTY DESERT THROUGH THE EVENING HOURS...RELATIVE
HUMIDITIES HAVE BEGUN TO RECOVER WITH MOST AREAS APPROACHING OR
ALREADY ABOVE THE CRITICAL 15 PERCENT VALUE. DUE TO THE WINDS
DECREASING AND THE RELATIVE HUMIDITY INCREASE...CRITICAL FIRE
WEATHER CRITERIA IS NO LONGER EXPECTED THROUGH THIS EVENING OR
TONIGHT. THUS THE RED FLAG WARNING WILL EXPIRE AS OF 8 PM PDT /
MST.

$$

Nearby

Red Flag Warnings in Nevada, 2008 Red Flag Warnings in California, 2008 Red Flag Warnings in Arizona, 2008 Every red flag warning in 2008

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.