Alert archive / Nevada / Flash Flood Warnings in 2001

Flash Flood Warning 16, NWS Las Vegas, NV

August 9, 2001Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 9, 2001, 11:50 PM PDT for Clark County, Nevada. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 9, 2001, 11:50 PM PDT (06:50 UTC)
Expired
Aug 10, 2001, 2:45 AM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Clark County, NV

The radar

The Las Vegas radar (KESX), 82 km from the middle of the area, began a volume at 06:51 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 00:00Z, 6.8 hours before the alert went out and 81 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, Mercury/Desert R, NV at 00:00Z on 2001-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 786 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Mercury/Desert R, NV at 00:00Z on 2001-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
786 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
3225 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
-26 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 
WGUS55 KVEF 100650
FFWLAS
FFWLAS
NVC003-100945-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1150 PM PDT THU AUG 9 2001

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CLARK COUNTY IN SOUTHERN NEVADA
  THIS INCLUDES THE FOLLOWING LOCATIONS...NELLIS AFB...NORTH LAS
  VEGAS

* UNTIL 245 AM PDT

* AT 1146 PM PDT...DOPPLER RADAR AND AUTOMATED RAIN GAGES INDICATED 
VERY HEAVY RAIN NORTH OF CRAIG ROAD AND OVER NORTH LAS VEGAS. THE 
THUNDERSTORM WAS MOVING SOUTHEAST AT 10 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE...NEAR NELLIS AFB 
AT 1205 AM PDT.

STAY CLEAR OF LOW LYING AREAS AND DO NOT DRIVE YOUR VEHICLE WHERE 
WATER COVERS THE ROAD.

LAT...LON 3661 11517 3643 11538 3611 11507 3632 11486

Nearby

Flash Flood Warnings in Nevada, 2001Every flash flood warning in 2001

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.