Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 83, NWS Las Vegas, NV

September 12, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 12, 2011, 3:43 PM MST for Mohave County, Arizona. It was in force for 90 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
Sep 12, 2011, 3:43 PM MST (22:43 UTC)
Expired
Sep 12, 2011, 5:13 PM MST
In force
90 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 118 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 171 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 2011-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.1000850700500300200100-30°-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 2011-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
8060 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
34 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.

438 
WGUS55 KVEF 122243
FFWVEF
AZC015-130145-
/O.NEW.KVEF.FF.W.0083.110912T2243Z-110913T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
343 PM MST MON SEP 12 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 645 PM MST.

* AT 338 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL MOHAVE COUNTY...OR
  21 MILES EAST OF KINGMAN. THE STORM PRODUCING VERY HEAVY RAIN WAS 
  MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HACKBERRY ROAD JUST SOUTH OF HIGHWAY 66

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3535 11374 3537 11361 3525 11359 3523 11372

$$

MORGAN
2 follow-up statements
216 
WGUS75 KVEF 122338
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
438 PM MST MON SEP 12 2011

AZC015-130145-
/O.CON.KVEF.FF.W.0083.000000T0000Z-110913T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
438 PM MST MON SEP 12 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 431 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED THAT 
RAIN HAD STOPPED OVER HACKBERRY ROAD FOR THE 
MOMENT...HOWEVER...ANOTHER SHOWER WAS DEVELOPING BACK TO THE 
SOUTHWEST. RADAR ESTIMATED THAT ENOUGH RAIN HAD FALLEN TO CAUSE 
HACKBERRY WASH TO FLOOD THE ROAD...SO THE FLASH FLOOD WARNING 
REMAINS IN EFFECT.

LOCATIONS IMPACTED INCLUDE...
HACKBERRY ROAD SOUTH OF HIGHWAY 66

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3535 11374 3537 11361 3525 11359 3523 11372

$$

MORGAN
460 
WGUS75 KVEF 130013
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
513 PM MST MON SEP 12 2011

AZC015-130023-
/O.CAN.KVEF.FF.W.0083.000000T0000Z-110913T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
513 PM MST MON SEP 12 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL MOHAVE
COUNTY...

AT 513 PM MST...RADAR INDICATED THAT NO HEAVY RAIN HAD FALLEN ON 
HACKBERRY ROAD SINCE 415 PM. NO REPORTS OF FLOODING HAVE BEEN 
RECEIVED...SO THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3535 11374 3537 11361 3525 11359 3523 11372

$$

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 12, 3:00 PM MSTSevere Thunderstorm WarningVEFMohave30 min
Sep 12, 4:06 PM MSTSevere Thunderstorm WarningVEFMohave39 min

Nearby

Flash Flood Warnings in Arizona, 2011Every flash flood warning in 2011

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.