Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 62, NWS Las Vegas, NV

July 30, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 30, 2012, 11:42 AM 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 30, 2012, 11:42 AM MST (18:42 UTC)
Expired
Jul 30, 2012, 1:45 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), 107 km from the middle of the area, began a volume at 18:42 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

Las Vegas, NV (KVEF), launched 12:00Z, 6.7 hours before the alert went out and 201 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, Las Vegas, NV at 12:00Z on 2012-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
2888 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
63 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.

678 
WGUS55 KVEF 301842
FFWVEF
AZC015-302045-
/O.NEW.KVEF.FF.W.0062.120730T1842Z-120730T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1142 AM MST MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 145 PM MST.

* AT 1133 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL MOHAVE COUNTY...OR
  11 MILES SOUTH OF KINGMAN...MOVING NORTHWEST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...WABAYUMA PEAK WILDERNESS AND WALNUT   
  CREEK AND BLACK ROCK WASH FLOWING FROM THE WESTERN SLOPES OF THE   
  HUALAPAI MOUNTAINS.

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 3515 11411 3515 11398 3503 11389 3494 11389
      3491 11415

$$

PIERCE
2 follow-up statements
467 
WGUS75 KVEF 301946
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1246 PM MST MON JUL 30 2012

AZC015-302045-
/O.CON.KVEF.FF.W.0062.000000T0000Z-120730T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1246 PM MST MON JUL 30 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 1238 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH HEAVY RAIN HAVE MOVED AWAY FROM THE WABAYUMA PEAK 
WILDERNESS AREA. HOWEVER...RUNOFF FROM THE HEAVY RAIN EARLIER WILL 
CONTINUE TO IMPACT WALNUT CREEK AND BLACK ROCK WASH...AS WELL AS 
OTHER NORMALLY DRY WASHES IN THE AREA THAT FLOW OUT OF THE WESTERN 
SLOPES OF THE HUALAPAI MOUNTAINS. A FLASH FLOOD WARNING REMAINS IN 
EFFECT UNTIL 145 PM MST. 

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 3515 11411 3515 11398 3503 11389 3494 11389
      3491 11415

$$

PIERCE
774 
WGUS75 KVEF 302038
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
138 PM MST MON JUL 30 2012

AZC015-302047-
/O.EXP.KVEF.FF.W.0062.000000T0000Z-120730T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
138 PM MST MON JUL 30 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 145 PM MST FOR CENTRAL
MOHAVE COUNTY...

HEAVY RAINFALL HAS NOT FALLEN WITHIN THE WARNING AREA DURING THE 
PAST HOUR. THE FLASH FLOOD WARNING WILL EXPIRE AT 145 PM MST. 


LAT...LON 3515 11411 3515 11398 3503 11389 3494 11389
      3491 11415

$$

PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 9:00 PM MSTFlash Flood WatchVEFMohave25 hr
Jul 30, 11:01 AM MSTFlash Flood WarningVEFMohave119 min
Jul 30, 12:05 PM MSTAreal Flood AdvisoryVEFMohave115 min
Jul 30, 1:16 PM MSTFlash Flood WarningVEFMohave119 min

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.