Alert archive / Arizona / Red Flag Warnings in 2007

Red Flag Warning 13, NWS Las Vegas, NV

May 23, 2007Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this red flag warning at May 23, 2007, 5:14 AM MST for Mohave County, Arizona; Clark County, Nevada. It took effect at May 23, 2007, 10:00 AM MST. It was in force for 4 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: May 23, 2007, 5:14 AM MST (12:14 UTC)
In effect from: May 23, 2007, 10:00 AM MST
Expired: May 23, 2007, 1:41 PM MST
In force: 4 hr
Issued by: NWS Las Vegas, NV

Counties Mohave County, AZ, Clark County, NV

The radar

The Las Vegas radar (KESX), 54 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.

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 0.2 hours before the alert went out and 162 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: 2020 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: -193 m²/s²
0-3 km storm-relative helicity: -70 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 231214
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
514 AM PDT WED MAY 23 2007


AZZ101-NVZ466-232015-
/O.NEW.KVEF.FW.W.0013.070523T1700Z-070524T0000Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LAKE MEAD NRA/COLORADO RIVER-
NV SIDE-
514 AM PDT WED MAY 23 2007 /514 AM MST WED MAY 23 2007/

...RED FLAG WARNING IN EFFECT FROM 10 AM PDT /10 AM MST/ THIS
MORNING TO 5 PM PDT /5 PM MST/ THIS AFTERNOON FOR GUSTY WINDS 
AND LOW RELATIVE HUMIDITY...

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 5 PM PDT /5 PM MST/ THIS AFTERNOON FOR THE LAKE MEAD
NRA DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY.

A COLD FRONT ALONG WITH A WEAK STORM MOVING ACROSS THE AREA THIS
MORNING WILL PRODUCE STRONG AND GUSTY WINDS ACROSS THE AREA BY
LATE MORNING AND INTO THIS AFTERNOON. NORTH WINDS BETWEEN 20 AND
30 MPH WITH GUSTS TO AROUND 40 MPH WILL LIKELY BE SEEN DURING THE
DAY. THESE WINDS COMBINED WITH RELATIVE HUMIDITY VALUES BELOW 15
PERCENT BY THIS AFTERNOON WILL LIKELY CREATE ERRATIC FIRE BEHAVIOR
TO ANY STARTS.

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 231656
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
956 AM PDT WED MAY 23 2007

AZZ101-NVZ466-240000-
/O.CON.KVEF.FW.W.0013.070523T1700Z-070524T0000Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LAKE MEAD NRA/COLORADO RIVER-
NV SIDE-
956 AM PDT WED MAY 23 2007 /956 AM MST WED MAY 23 2007/

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT /5 PM MST/
THIS AFTERNOON...

A RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT /5 PM MST/
THIS AFTERNOON. 

A COLD FRONT ALONG WITH A WEAK STORM SYSTEM MOVING ACROSS THE
AREA WILL PRODUCE STRONG AND GUSTY WINDS THROUGH THIS AFTERNOON.
NORTH WINDS BETWEEN 20 AND 30 MPH WITH GUSTS TO AROUND 40 MPH WILL
BE SEEN DURING THE DAY. THESE WINDS COMBINED WITH RELATIVE
HUMIDITY VALUES BELOW 15 PERCENT WILL LIKELY CREATE ERRATIC FIRE
BEHAVIOR TO ANY STARTS.

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.

$$

000 
WWUS85 KVEF 232041
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
141 PM PDT WED MAY 23 2007

AZZ101-NVZ466-232145-
/O.CAN.KVEF.FW.W.0013.000000T0000Z-070524T0000Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LAKE MEAD NRA/COLORADO RIVER-
NV SIDE-
141 PM PDT WED MAY 23 2007 /141 PM MST WED MAY 23 2007/

...RED FLAG WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS CANCELLED THE RED
FLAG WARNING. 

WINDS HAVE SLOWLY DECREASED THIS AFTERNOON AND HAVE DROPPED TO
BELOW RED FLAG WARNING CRITERIA. NORTH WINDS 10 TO 20 MPH WITH
OCCASIONAL GUSTS TO 30 MPH ARE STILL LIKELY FOR THE REMAINDER OF
THE AFTERNOON.

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 3:48 AM MST	Lake Wind Advisory	VEF		13 hr
May 23, 12:33 AM MST	Wind Advisory	VEF	Clark, Esmeralda, Nye	5 hr

Nearby

Red Flag Warnings in Arizona, 2007 Red Flag Warnings in Nevada, 2007 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.