Alert archive / Arizona / Flash Flood Warnings in 1999

Flash Flood Warning 26, NWS Las Vegas, NV

July 12, 1999Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 12, 1999, 6:26 AM MST for Mohave County, Arizona. It was in force for 64 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
Jul 12, 1999, 6:26 AM MST (13:26 UTC)
Expired
Jul 12, 1999, 7:30 AM MST
In force
64 min
Issued by
NWS Las Vegas, NV
Area
Whole counties

County Mohave County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 1.4 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 1999-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 1999-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.1939Sfc1 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
1297 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-25 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 121328
FFWLAS
AZC015-121430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
626 AM PDT (626 AM MST) MON JUL 12 1999


*  FLASH FLOOD WARNING FOR
   WEST CENTRAL MOHAVE COUNTY IN NORTHWESTERN ARIZONA

*  UNTIL 730 AM MST

*  SOME LOCATIONS AFFECTED
   KINGMAN
   STATE ROUTE 66 BETWEEN KINGMAN AND TRUXTON

*  AT 620 AM MST RADAR SHOWED A STORMS CONTAINING VERY HEAVY
   RAINFALL MOVING INTO KINGMAN. THESE STORMS WILL LIKELY
   PRODUCE RAINFALL RATES IN EXCESS OF 1 INCH PER HOUR...
   RESULTING IN FLASH FLOODING OF WASHES AND LOW-LYING AREAS.


A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR
IMMINENT.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. IF WATER COVERS THE
ROADWAY...DO NOT ATTEMPT TO DRIVE THROUGH IT. IT ONLY TAKES ABOUT
A FOOT OR TWO OF WATER TO CAUSE A CAR TO FLOAT. DO NOT DRIVE AROUND
BARRICADES.

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 Jul 12, 5:42 AM MST, 44 minutes earlier.

Area forecast discussion, Jul 12, 5:42 AM MST, 44 minutes before
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
...UPDATED
NATIONAL WEATHER SERVICE LAS VEGAS NV
542 AM PDT MON JUL 12 1999

SYNOPSIS...WEATHER DISTURBANCE OVER NORTHWEST ARIZONA WILL CONTINUE
MOVING WEST...AND WILL BRING SCATTERED SHOWERS AND THUNDERSTORMS TO
THE REGION TODAY. EXPECT IMPROVING CONDITIONS THIS AFTERNOON OVER
NORTHWEST ARIZONA AND SOUTHERN NEVADA IN THE WAKE OF THIS
DISTURBANCE. HIGH PRESSURE WILL REFORM NEAR THE FOUR CORNERS ON
TUESDAY...AND THIS WILL GIVE THE REGION A SOUTH OR SOUTHEAST FLOW
ALOFT. OVERALL THE AIRMASS WILL REMAIN FAIRLY MOIST AND UNSTABLE
THROUGH MIDWEEK. DAYTIME TEMPERATURES WILL BE NEAR OR BELOW NORMAL.

DISCUSSION...VORT MAX OVER FAR NW AZ HAS INTENSIFIED AS EVIDENCED BY
SATELLITE AND RADAR TRENDS. HAVE UPDATED THE FORECAST TO INCREASE
AREAL COVERAGE OF SHOWERS/THUNDERSTORMS AND INCREASED POPS ACROSS
MUCH OF THE CWA TODAY. VORT FEATURE WILL CONTINUE MOVING WWD...WITH
IMPROVING CONDITIONS ANTICIPATED OVER NW AZ AND SRN NV THIS
AFTERNOON.

AUTOMATED GAGES THUS FAR HAVE RECORDED LIGHT RAINFALL AMOUNTS OVER NW
AZ AND FAR SRN NV. HOWEVER...MODERATE TO LOCALLY HEAVY RAINFALL IS
POSSIBLE WITH ANY CONVECTION.

.LAS...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 7:30 AM MSTFlash Flood WarningVEFMohave60 min

Nearby

Flash Flood Warnings in Arizona, 1999Every flash flood warning in 1999

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.