Alert archive / Nevada / Flash Flood Warnings in 2010

Flash Flood Warning 21, NWS Las Vegas, NV

July 30, 2010Lincoln County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 30, 2010, 6:42 PM PDT for Lincoln County, Nevada; Mohave County, Arizona. 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 outline as issued.

The facts

Issued
Jul 30, 2010, 6:42 PM PDT (01:42 UTC)
Expired
Jul 30, 2010, 8:45 PM PDT
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

Counties Mohave County, AZ, Lincoln County, NV

The radar

The Cedar City radar (KICX), 132 km from the middle of the area, began a volume at 01:45 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 00:00Z, 1.7 hours before the alert went out and 287 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 00:00Z on 2010-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 466 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 00:00Z on 2010-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 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
466 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
592 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
96 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.

203 
WGUS55 KVEF 310142
FFWVEF
AZC015-NVC017-310345-
/O.NEW.KVEF.FF.W.0021.100731T0142Z-100731T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
642 PM PDT FRI JUL 30 2010

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME NORTH CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...
  SOUTHEASTERN LINCOLN COUNTY IN SOUTH CENTRAL NEVADA...

* UNTIL 845 PM PDT/845 PM MST/

* AT 632 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN OVER SOUTHEAST LINCOLN COUNTY WITH RADAR ESTIMATES 
  IN EXCESS OF TWO INCHES OVER THE PAST HOUR. THIS WARNING INCLUDES 
  THE TOQUOP WASH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
TURN AROUND...DONT DROWN.

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. TURN AROUND...DONT DROWN. FIND ALTERNATE ROUTES.

&&

LAT...LON 3684 11405 3685 11432 3719 11428 3718 11404

$$

SC
2 follow-up statements
661 
WGUS75 KVEF 310240
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
740 PM MST FRI JUL 30 2010

AZC015-NVC017-310345-
/O.CON.KVEF.FF.W.0021.000000T0000Z-100731T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-LINCOLN NV-
740 PM MST FRI JUL 30 2010

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST/845 PM
PDT/ FOR SOUTHEASTERN LINCOLN AND MOHAVE COUNTIES...

AT 735 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE VERY HEAVY RAIN OVER PORTIONS OF SOUTHEAST LINCOLN 
COUNTY...INCLUDING THE EAST MORMON MOUNTAINS AND THE TOQUOP WASH. 
RADAR ESTIMATED RAINFALL AMOUNTS ARE BETWEEN TWO AND THREE INCHES. 
AN ADDITIONAL ONE HALF TO ONE INCH OF RAINFALL IS POSSIBLE BY 830 
PM. THE TOQUOP WASH...DIRT ROADS AND LOW LYING AREAS ARE LIKELY 
EXPERIENCING FLASH FLOODING.

LAT...LON 3684 11405 3685 11432 3719 11428 3718 11404

$$

SC
701 
WGUS75 KVEF 310343
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
843 PM MST FRI JUL 30 2010

AZC015-NVC017-310350-
/O.EXP.KVEF.FF.W.0021.000000T0000Z-100731T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-LINCOLN NV-
843 PM MST FRI JUL 30 2010

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MST/845 PM PDT/ FOR
SOUTHEASTERN LINCOLN AND MOHAVE COUNTIES...

RADAR DATA INDICATES THAT HEAVY RAIN HAS ENDED WITHIN THE WARNED 
AREA OF EXTREME SOUTHEAST LINCOLN AND EXTREME NORTHWEST MOHAVE 
COUNTIES. THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 845 
PM. 

LAT...LON 3684 11405 3685 11432 3719 11428 3718 11404

$$

PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 5:23 PM PDTSevere Thunderstorm WarningVEFLincoln19 min
Jul 31, 3:25 AM PDTFlash Flood WatchVEFMohave17 hr
Jul 31, 1:28 PM PDTAreal Flood AdvisoryVEFMohave44 min
Jul 31, 2:09 PM PDTAreal Flood AdvisoryVEFMohave60 min
Jul 31, 3:07 PM PDTFlash Flood WarningVEFMohave113 min

Nearby

Flash Flood Warnings in Nevada, 2010Flash Flood Warnings in Arizona, 2010Every flash flood warning in 2010

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.