Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 190, NWS Las Vegas, NV

September 9, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 9, 2012, 3:47 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
Sep 9, 2012, 3:47 PM MST (22:47 UTC)
Expired
Sep 9, 2012, 5:45 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), 76 km from the middle of the area, began a volume at 22:49 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
Sep 9, 5:13 PM MSTFLASH FLOOD4 Ene Golden Valley, AZTRAINED SPOTTER IN GOLDEN VALLEY REPORTED SEVERAL ROADS COMPLETELY FLOODED AND IMPASSABLE WITH AT LEAST TWO FEET OF WATER COVERING THE ROADS. SPOTTER ALSO STATED IT WAS THE WORST HE HAS EVER SEEN.

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, 10.8 hours before the alert went out and 170 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 2012-09-09Temperature 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 2012-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 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
3433 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
8 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.

858 
WGUS55 KVEF 092247
FFWVEF
AZC015-100045-
/O.NEW.KVEF.FF.W.0190.120909T2247Z-120910T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
347 PM MST SUN SEP 9 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 545 PM MST.

* AT 340 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 6 MILES NORTHEAST OF GOLDEN
  VALLEY...OR 8 MILES NORTHWEST OF KINGMAN. THE STORM PRODUCING VERY
  HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...STOCKTON HILL ROAD...NORTHWEST 
KINGMAN...GOLDEN VALLEY...HIGHWAY 93.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3531 11438 3538 11404 3521 11398 3518 11436

$$

ASG
2 follow-up statements
720 
WGUS75 KVEF 092341
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
441 PM MST SUN SEP 9 2012

AZC015-100045-
/O.CON.KVEF.FF.W.0190.000000T0000Z-120910T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
441 PM MST SUN SEP 9 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST FOR WEST
CENTRAL MOHAVE COUNTY...

AT 432 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN AROUND KINGMAN AND 
GOLDEN VALLEY. THESE STORMS WITH EXCESSIVE RAIN WERE NEARLY 
STATIONARY. NEW RAINFALL ON TOP OF RUNOFF FROM HEAVY RAINFALL 
EARLIER WILL KEEP THE THREAT OF FLASH FLOODING GOING THROUGH 545 PM.

LOCATIONS IMPACTED INCLUDE...
NEW KINGMAN-BUTLER AND GOLDEN VALLEY.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3531 11438 3538 11404 3521 11398 3518 11436

$$

JH
011 
WGUS75 KVEF 100042
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
542 PM MST SUN SEP 9 2012

AZC015-100050-
/O.EXP.KVEF.FF.W.0190.000000T0000Z-120910T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
542 PM MST SUN SEP 9 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST FOR WEST CENTRAL
MOHAVE COUNTY...

THE HEAVY RAIN THAT PROMPTED THE FLASH FLOOD WARNING HAS WEAKENED 
WITH ONLY LIGHT RAIN IN THE GENERAL AREA. HOWEVER...THERE HAVE BEEN 
REPORTS OF SEVERAL ROADS IN GOLDEN VALLEY THAT ARE CLOSED DUE TO 
FLOODING.  

LAT...LON 3531 11438 3538 11404 3521 11398 3518 11436

$$

ASG

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 1:58 PM MSTSevere Thunderstorm WarningVEFMohave35 min
Sep 9, 2:26 PM MSTFlash Flood WatchVEFMohave55 hr
Sep 9, 3:17 PM MSTSevere Thunderstorm WarningVEFMohave43 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.