Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 50, NWS Las Vegas, NV

July 9, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 9, 2011, 4:57 PM MST for Mohave County, Arizona. It was in force for 98 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 9, 2011, 4:57 PM MST (23:57 UTC)
Expired
Jul 9, 2011, 6:35 PM MST
In force
98 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), 141 km from the middle of the area, began a volume at 23:55 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, 12.0 hours before the alert went out and 148 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 2011-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 293 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 2011-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
293 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1247 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
-4 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.

857 
WGUS55 KVEF 092357
FFWVEF
AZC015-100200-
/O.NEW.KVEF.FF.W.0050.110709T2357Z-110710T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
457 PM MST SAT JUL 9 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 700 PM MST.

* AT 450 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM NEAR DIAMOND M RANCH...OR 37   
  MILES EAST OF KINGMAN JUST NORTH OF INTERSTATE 40. THE STORM 
  PRODUCING FLASH FLOODING WAS   NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...DIAMOND M RANCH AND RURAL ROAD JUST 
  NORTH OF INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS...AROUND UNDERPASSES...
AND IN NORMALLY DRY WASHES AND LOW LYING AREAS. FLASH FLOODING IS
NATURES NUMBER ONE KILLER. 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 11348 3535 11334 3516 11334 3517 11348

$$

JH
2 follow-up statements
406 
WGUS75 KVEF 100041
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
541 PM MST SAT JUL 9 2011

AZC015-100200-
/O.CON.KVEF.FF.W.0050.000000T0000Z-110710T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
541 PM MST SAT JUL 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 533 PM MST...RADAR INDICATED THAT THE THUNDERSTORMS PRODUCING 
HEAVY RAIN HAVE MOVED NORTH OF THE AREA. A SPOTTER AT DIAMOND M 
RANCH REPORTED WASHES RUNNING BANKFULL. ADDITIONAL RUNOFF FROM THE 
EARLIER RAIN COULD STILL CAUSE FLASH FLOODING IN THE AREA NORTH OF 
INTERSTATE 40 IN EAST CENTRAL MOHAVE COUNTY. 

LOCATIONS IMPACTED INCLUDE...DIAMOND M RANCH.

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 11348 3535 11334 3516 11334 3517 11348

$$

JH
485 
WGUS75 KVEF 100135
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
635 PM MST SAT JUL 9 2011

AZC015-100144-
/O.CAN.KVEF.FF.W.0050.000000T0000Z-110710T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
635 PM MST SAT JUL 9 2011

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

NO RAIN HAS FALLEN IN QUITE AWHILE IN THE AREA AROUND DIAMOND M 
RANCH NORTH OF INTERSTATE 40. ANY FLOODING WOULD HAVE DIMINISHED. 

LAT...LON 3535 11348 3535 11334 3516 11334 3517 11348

$$

JH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 1:28 PM MSTAreal Flood AdvisoryVEFMohave3 hr
Jul 9, 3:01 PM MSTSevere Thunderstorm WarningVEFMohave44 min
Jul 9, 4:07 PM MSTFlash Flood WarningVEFMohave113 min
Jul 9, 4:46 PM MSTFlash Flood WarningVEFMohave119 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.