Alert archive / Arizona / Flash Flood Warnings in 2007

Flash Flood Warning 41, NWS Las Vegas, NV

August 30, 2007Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 30, 2007, 1:40 PM MST for Mohave County, Arizona. It took effect at Aug 30, 2007, 1:45 PM MST. 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
Aug 30, 2007, 1:40 PM MST (20:40 UTC)
In effect from
Aug 30, 2007, 1:45 PM MST
Expired
Aug 30, 2007, 3:45 PM MST
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Whole counties

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 102 km from the middle of the area, began a volume at 20:43 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, 8.7 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 2007-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2007-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
117 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
2155 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
19 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 302045
FFWVEF
AZC015-302245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
140 PM MST THU AUG 30 2007

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 345 PM MST.

* AT 132 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...HUALAPAI PEAK.

AT 140 PM RAIN GAGES INDICATE OVER A HALF AN INCH OF RAIN IN LESS 
THAN 10 MINUTES IN THE HUALAPAI RANGE HAS FALLEN...WITH OVER AN INCH 
TOTAL SO FAR THIS AFTERNOON. THE MOSS WASH IS THE MOST THREATENED 
AREA FOR THE HEAVY RUN OFF. HIKERS AND OTHERS IN AND NEAR THE 
HUALAPAI MOUNTAINS SHOULD LEAVE LOW LYING AREAS AND SEEK HIGHER 
GROUND.

LAT...LON 3500 11411 3477 11386 3514 11337 3536 11395

$$

JJ
1 follow-up statement
000
WGUS75 KVEF 302152
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
245 PM PDT THU AUG 30 2007

AZC015-302245-
MOHAVE AZ-
245 PM MST THU AUG 30 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST FOR
CENTRAL MOHAVE COUNTY...

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HUALAPAI PEAK

THE THUNDERSTORM THAT PRODUCED THE HEAVY RAIN FALL HAS NEARLY 
DISSIPATED AT 245 PM. SEVERAL AUTOMATED RAIN GAGES REPORTED VERY 
HEAVY RAINFALL IN A SHORT PERIOD OF TIME. IN THE MOSS WASH AN 
AUTOMATED GAGE REPORTED ONE AND A HALF INCHES OF RAIN IN AN HOUR 
ENDING AT 208 PM. ANOTHER GAGE REPORTED .82 INCHES OF RAIN IN 50 
MINUTES ENDING AT 220 PM AND 1.61 INCHES OF RAIN SINCE 1140 AM.

RUN OFF IS EXPECTED TO CONTINUE TO PRODUCE FLOODING CONDITIONS ON 
AND NEAR THE HUALAPAI MOUNTAINS UNTIL 345 PM THIS AFTERNOON. 

IN DESERT TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. SEVERAL INCHES OF SWIFTLY
FLOWING WATER CAN CARRY VEHICLES AWAY.

LAT...LON 3500 11411 3477 11386 3514 11337 3536 11395

$$

JJ

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 3:39 PM MSTFlash Flood WarningVEFMohave2 hr
Aug 30, 3:55 PM MSTFlash Flood WarningVEFMohave3 hr

Nearby

Flash Flood Warnings in Arizona, 2007Every flash flood warning in 2007

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.