Alert archive / Arizona / Flash Flood Warnings in 2003

Flash Flood Warning 2, NWS Las Vegas, NV

July 22, 2003Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 22, 2003, 6:34 PM MST for Mohave County, Arizona. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 22, 2003, 6:34 PM MST (01:34 UTC)
Expired: Jul 22, 2003, 7:30 PM MST
In force: 56 min
Issued by: NWS Las Vegas, NV
Area: Counties, with a storm outline in the text

County Mohave County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 1.6 hours before the alert went out and 216 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: 387 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2073 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 76 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 230134
FFWVEF
AZC015-230330-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
634 PM MST TUE JUL 22 2003

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA

* UNTIL 830 PM MST

* AT 633 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAIN OVER NORTHERN MOHAVE COUNTY 31 
  MILES EAST OF LITTLEFIELD...MOVING WEST AT 15 MPH.

* THE THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL BE...
  NEAR LITTLEFIELD AT 810 PM MST

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLASH FLOODING OF 
WASHES AND NARROW CANYONS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK 
AND MUDSLIDES IN STEEP TERRAIN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT. IF YOU ARE 
CAMPING OR HIKING...IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO
STREAMS...RIVERS...OR WASHES. STAY AWAY FROM NARROW CANYONS WHERE 
FLOOD WATERS CAN BECOME KILLERS IN HEAVY RAINS.

LAT...LON 3642 11290 3699 11329 3701 11406 3643 11401

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:06 PM MST	Severe Thunderstorm Warning	VEF	Mohave	39 min
Jul 23, 12:51 PM MST	Severe Thunderstorm Warning	VEF	Mohave	39 min
Jul 23, 1:38 PM MST	Severe Thunderstorm Warning	VEF	Mohave	37 min

Nearby

Flash Flood Warnings in Arizona, 2003 Every flash flood warning in 2003

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.