Alert archive / Arizona / Flash Flood Warnings in 1997

Flash Flood Warning 20, NWS Las Vegas, NV

August 9, 1997Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 9, 1997, 12:29 AM MST for Mohave County, Arizona. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 9, 1997, 12:29 AM MST (07:29 UTC)
Expired: Aug 9, 1997, 1:30 AM MST
In force: 61 min
Issued by: NWS Las Vegas, NV
Area: Whole counties

County Mohave County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 7.5 hours before the alert went out and 185 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: 1807 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 11 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 
TTAA00 KLAS 090749 COR
FFWLAS
AZC015-090830-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING...CORRECTED TIME
NATIONAL WEATHER SERVICE LAS VEGAS NV
1229 AM PDT (1229 AM MST) SAT AUG 9 1997

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  130 AM PDT (130 AM MST)
FOR PEOPLE IN THE FOLLOWING LOCATIONS......

IN NORTHWEST ARIZONA

   ...CENTRAL MOHAVE COUNTY

AT 1230 AM LAS VEGAS DOPPLER WEATHER RADAR INDICATED AN AREA OF SEVERE
THUNDERSTORMS BETWEEN COTTONWOOD COVE AND DOLAN SPRINGS. MOVEMENT WAS
TOWARD THE NORTHEAST AT 10 MPH. RADAR ESTIMATED THAT AN INCH OF RAIN HAD
FALLEN OVER THIS AREA IN THE LAST HOUR.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T2 DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Aug 8, 9:49 PM MST, 2 hours 40 minutes earlier.

Area forecast discussion, Aug 8, 9:49 PM MST, 2 hours 40 minutes before

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
930 PM PDT FRI AUG 8 1997

KESX RADAR SHOWED THE MOST INTENSE TRW NOW ACRS ERN MOHAVE COUNTY N
OF INTERSTATE 40.  OTHER LESS INTENSE ACTIVITY WAS LIFTING NE ACRS
PTNS OF S CNTRL NEVADA.  UPDATED ALL ZONES TO REFLECT A TREND
TOWARD TRW DYING OUT ACRS S CNTRL NEVADA BY MIDNIGHT BUT CONTINUING
ACRS MAINLY ERN PTNS OF MOHAVE COUNTY ARIZONA THRU MOST OF THE
NIGHT DUE TO NEW DEVELOPMENT WITH MERGERS AND OUTFLOW BOUNDARY
INTERACTIONS. BRIEFLY LOOKED AT 00Z PROGS. THEY DID INDICATE SOME
SORT OF GRADUAL DRYING TREND...WHICH IS REFLECTED IN THE CURRENT
FSCT PACKAGE. NEW FSCT PACKAGE REFLECTING FIRST PD UPDlATES FOR ALL
ZONES ALREADY OUT.  LAS0100  MATUSIEWICZ

SRN NV...NONE
ERN CA...NONE
NW AZ ...NONE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 11:30 PM MST	Severe Thunderstorm Warning	VEF	Mohave	60 min
Aug 9, 12:29 AM MST	Severe Thunderstorm Warning	VEF	Mohave	61 min
Aug 9, 1:24 AM MST	Flash Flood Warning	VEF	Mohave	66 min
Aug 9, 1:24 AM MST	Severe Thunderstorm Warning	VEF	Mohave	66 min

Nearby

Flash Flood Warnings in Arizona, 1997 Every flash flood warning in 1997

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.