Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 108, NWS Las Vegas, NV

August 9, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 9, 2012, 4:32 PM MST for Mohave County, Arizona. It was in force for 118 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 9, 2012, 4:32 PM MST (23:32 UTC)
Expired
Aug 9, 2012, 6:30 PM MST
In force
118 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), 63 km from the middle of the area, began a volume at 23:34 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.

What was reported inside it

TimeReportWhereRemark
Aug 9, 5:00 PM MSTFLASH FLOOD12 Ne Dolan Springs, AZSTOCKTON HILL ROAD WAS FLOODED AND CLOSED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 11.5 hours before the alert went out and 145 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 2012-08-09Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 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
4744 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
29 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.

189 
WGUS55 KVEF 092332
FFWVEF
AZC015-100130-
/O.NEW.KVEF.FF.W.0108.120809T2332Z-120810T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
432 PM MST THU AUG 9 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 422 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR DOLAN SPRINGS...OR 30
  MILES NORTH OF KINGMAN...MOVING SOUTH AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DOLAN SPRINGS...PIERCE FERRY ROAD AND STOCKTON HILLS ROAD.

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 3564 11442 3565 11414 3582 11414 3584 11406
      3550 11391 3550 11431

$$

JS
2 follow-up statements
333 
WGUS75 KVEF 100031
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
531 PM MST THU AUG 9 2012

AZC015-100130-
/O.CON.KVEF.FF.W.0108.000000T0000Z-120810T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
531 PM MST THU AUG 9 2012

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

AT 521 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN.  THIS STORM WAS 
LOCATED BETWEEN DOLAN SPRINGS AND CHLORIDE AND WAS MOVING SOUTH AT 
10 MPH.

LOCATIONS IMPACTED INCLUDE...
DOLAN SPRINGS...PIERCE FERRY ROAD AND STOCKTON HILLS ROAD.

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 3564 11442 3565 11414 3582 11414 3584 11406
      3550 11391 3550 11431

$$

JS
868 
WGUS75 KVEF 100128
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
628 PM MST THU AUG 9 2012

AZC015-100137-
/O.EXP.KVEF.FF.W.0108.000000T0000Z-120810T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
628 PM MST THU AUG 9 2012

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

THUNDERSTORMS THAT PRODUCED THE EARLIER HEAVY RAIN HAVE DISSIPATED 
AND FLASH FLOODING IS NO LONGER EXPECTED. ELEVATED WATER LEVELS AND 
PONDING OF WATER IN LOW LYING AREAS IS STILL POSSIBLE THROUGH 8 PM.

LAT...LON 3564 11442 3565 11414 3582 11414 3584 11406
      3550 11391 3550 11431

$$

JS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 2:43 PM MSTFlash Flood WarningVEFMohave2 hr
Aug 9, 2:58 PM MSTFlash Flood WarningVEFMohave3 hr
Aug 9, 3:55 PM MSTFlash Flood WarningVEFMohave102 min
Aug 9, 4:04 PM MSTFlash Flood WarningVEFMohave116 min
Aug 9, 4:48 PM MSTSevere Thunderstorm WarningVEFMohave23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.