Alert archive / Arizona / Flash Flood Warnings in 2001

Flash Flood Warning 19, NWS Las Vegas, NV

August 14, 2001Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 14, 2001, 3:45 PM MST for Mohave County, Arizona. It was in force for 75 min. 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 14, 2001, 3:45 PM MST (22:45 UTC)
Expired: Aug 14, 2001, 5:00 PM MST
In force: 75 min
Issued by: NWS Las Vegas, NV
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 148 km from the middle of the area, began a volume at 22:45 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.8 hours before the alert went out and 170 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: 342 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 23 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 142247
FFWLAS
AZC015-150100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
345 PM MST TUE AUG 14 2001

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA
  THIS INCLUDES THE FOLLOWING LOCATION...WIKIEUP...AREAS ALONG
  HIGHWAY 93 SOUTH OF INTERSTATE 40...THE HUALAPAI MOUNTAINS...TROUT
  CREEK AND THE BIG SANDY RIVER 

* UNTIL 600 PM MST

* AT 345 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
  AREA OF THUNDERSTORMS WITH VERY HEAVY RAIN ALONG HIGHWAY 93 SOUTH
  OF INTERSTATE 40 TO NEAR WIKIEUP. THE STORMS WERE MOVING SOUTHWEST
  AT 10 MPH.

* THE THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL BE...  EAST OF
  HIGHWAY 93 AND OVER THE HUALAPAI MOUNTAINS AT 430 PM MST

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLASH FLOODING OF 
WASHES AND SMALL STREAMS. ADDITIONALLY...HIGHWAYS...UNDERPASSES AND 
OTHER LOW LYING AREAS WILL BE SUBJECT TO FLASH FLOODING.

NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
IT ONLY TAKES A FOOT OR TWO OF FLOWING WATER TO WASH MOST CARS AWAY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

NEMETH

LAT...LON 3519 11339 3517 11378 3439 11411 3441 11341

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 2:31 PM MST	Severe Thunderstorm Warning	VEF	Mohave	59 min
Aug 14, 3:30 PM MST	Severe Thunderstorm Warning	VEF	Mohave	60 min

Nearby

Flash Flood Warnings in Arizona, 2001 Every 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.