Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 21, NWS Las Vegas, NV

July 24, 1998Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 24, 1998, 4:49 AM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 2 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: Jul 24, 1998, 4:49 AM MST (11:49 UTC)
Expired: Jul 24, 1998, 6:50 AM MST
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Whole counties

Counties Mohave County, AZ, Clark County, NV

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 11.8 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: 245 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1915 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 5 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 241150
FFWLAS
AZC015-NVC003-241350-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
449 AM PDT (449 AM MST) FRI JUL 24 1998


*  FLASH FLOOD WARNING FOR
   NORTHEASTERN AND EAST CENTRAL CLARK COUNTY IN SOUTHERN NEVADA
   NORTHERN MOHAVE COUNTY IN NORTHWESTERN ARIZONA

*  UNTIL 650 AM PDT (650 AM MST)

*  SOME LOCATIONS AFFECTED
   THE LAKE MEAD NATIONAL RECREATION AREA...ESPECIALLY
   OVERTON BEACH...TEMPLE BAR...SOUTH COVE/MEADVIEW
   AND PEARCE FERRY
   OVERTON...MESQUITE...MOAPA...LOGANDALE...MOAPA...BUNKERVILLE
   LITTLEFIELD

*  AT 445 AM PDT (MST)...SATELLITE IMAGERY AND AUTOMATED RAIN GAGES
STILL INDICATED HEAVY RAIN FALLING OVER NORTHEASTERN AND EAST
CENTRAL CLARK COUNTY AND OVER PORTIONS OF NORTHERN MOHAVE COUNTY.
THUS...THE NATIONAL WEATHER SERVICE IS CONTINUING THE FLASH FLOOD
WARNING.  EVEN IF THUNDERSTORMS DO SUBSIDE OR WEAKEN SLIGHTLY
...FLASH FLOODING IS AND WILL CONTINUE TO BE LIKELY.

THESE STORMS HAVE EXHIBITED LITTLE MOVEMENT IN THE LAST COUPLE
HOURS AND WILL REMAIN FAIRLY STATIONARY FOR THE NEXT COUPLE
HOURS.  RAIN FALL RATES OF NEAR ONE INCH OR MORE PER HOUR CAN BE
EXPECTED WITH THESE STORMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING. IT IS VERY DIFFICULT
"AT NIGHT TO TELL HOW MUCH WATER IS ON ROADS. MOTORISTS SHOULD NOT
DRIVE THROUGH WATER OF UNKNOWN DEPTH.

CORDERO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 2:52 AM MST	Flash Flood Warning	VEF	Mohave	118 min
Jul 23, 6:14 PM MST	Flash Flood Warning	VEF	Esmeralda	116 min
Jul 23, 11:22 PM MST	Flash Flood Warning	VEF	Clark	2 hr
Jul 24, 3:15 PM MST	Severe Thunderstorm Warning	VEF	Clark	60 min
Jul 24, 3:21 PM MST	Flash Flood Warning	VEF	Clark	119 min

Nearby

Flash Flood Warnings in Arizona, 1998 Flash Flood Warnings in Nevada, 1998 Every flash flood warning in 1998

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.