Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 83, NWS Las Vegas, NV

July 31, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 4:29 PM MST for 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 31, 2012, 4:29 PM MST (23:29 UTC)
Expired
Jul 31, 2012, 6:30 PM MST
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 135 km from the middle of the area, began a volume at 23:32 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, 11.5 hours before the alert went out and 153 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 2012-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 209 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 2012-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.193958Sfc1 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
209 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
818 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
121 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.

309 
WGUS55 KVEF 312329
FFWVEF
AZC015-010130-
/O.NEW.KVEF.FF.W.0083.120731T2329Z-120801T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
429 PM MST TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 630 PM MST.

* AT 423 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL MOHAVE COUNTY...OR
  48 MILES NORTHEAST OF KINGMAN...OR ABOUT 10 MILES SOUTH OF THE 
  DIAMOND CREEK CAMPGROUND. THE STORM WAS MOVING TO THE NORTH AT 
  15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DIAMOND CREEK CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3576 11343 3576 11333 3557 11334 3560 11344

$$

SC
2 follow-up statements
026 
WGUS75 KVEF 010039
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
539 PM MST TUE JUL 31 2012

AZC015-010130-
/O.CON.KVEF.FF.W.0083.000000T0000Z-120801T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
539 PM MST TUE JUL 31 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 532 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THE 
THUNDERSTORMS HAVE MOVED NORTH OF THE AREA WARNED AREA. RUNOFF FROM 
THE EARLIER RAIN IS STILL LIKELY MOVING DOWN WASH TOWARD THE DIAMOND 
CREEK CAMPGROUND. 

LOCATIONS IMPACTED INCLUDE...DIAMOND CREEK CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3576 11343 3576 11333 3557 11334 3560 11344

$$

SC
674 
WGUS75 KVEF 010126
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
626 PM MST TUE JUL 31 2012

AZC015-010134-
/O.EXP.KVEF.FF.W.0083.000000T0000Z-120801T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
626 PM MST TUE JUL 31 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MST FOR CENTRAL
MOHAVE COUNTY...

AS OF 625 PM MST...NO REPORTS OF FLASH FLOODING HAVE BEEN REPORTED. 
PARK RANGERS ARE EXPECTED TO SURVEY TOMORROW FOR ANY EVIDENCE OF 
FLOODING. THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 630 
MST. 

LAT...LON 3576 11343 3576 11333 3557 11334 3560 11344

$$

SC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 2:29 AM MSTFlash Flood WatchVEFMohave19 hr
Jul 31, 12:14 PM MSTAreal Flood AdvisoryVEFMohave83 min
Jul 31, 1:55 PM MSTFlash Flood WarningVEFMohave2 hr
Jul 31, 2:21 PM MSTFlash Flood WarningVEFMohave114 min
Jul 31, 2:42 PM MSTFlash Flood WarningVEFMohave3 hr
Jul 31, 2:48 PM MSTFlash Flood WarningVEFMohave3 hr
Jul 31, 3:12 PM MSTAreal Flood AdvisoryVEFMohave113 min
Jul 31, 3:24 PM MSTFlash Flood WarningVEFMohave111 min
Jul 31, 4:15 PM MSTFlash Flood WarningVEFMohave2 hr

Nearby

Flash Flood Warnings in Arizona, 2012Every flash flood warning in 2012

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.