Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 198, NWS Las Vegas, NV

September 11, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 11, 2012, 5:05 AM MST for Mohave County, Arizona. It was in force for 65 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 11, 2012, 5:05 AM MST (12:05 UTC)
Expired
Sep 11, 2012, 6:10 AM MST
In force
65 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 12:08 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, 0.1 hours before the alert went out and 141 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 2012-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
2 J/kg
Mixed-layer CIN
-171 J/kg
Mixed-layer LCL
1725 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
37 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.

153 
WGUS55 KVEF 111205
FFWVEF
AZC015-111400-
/O.NEW.KVEF.FF.W.0198.120911T1205Z-120911T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
505 AM MST TUE SEP 11 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 700 AM MST.

* AT 503 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED 
TO INDICATE MODERATE SHOWERS FALLING FROM MEADVIEW...ALONG PIERCE 
FERRY ROAD TO THE PIERCE FERRY AND ANTARES ROAD JUNCTION...AND EAST 
TO GRAND CANYON RANCH. THIS ADDITIONAL RAINFALL IS OCCURRING OVER 
AREAS THAT HAVE ALREADY RECEIVED SIGNIFICANT RAINFALL OVER THE PAST 
COUPLE HOURS...WITH ONE LOCAL OBSERVATION SITE NEAR DIAMOND BAR ROAD 
AND PIERCE FERRY ROAD INDICATING TWO AND A QUARTER INCHES OF RAIN 
HAD FALLEN IN THE PAST TWO HOURS. 

THIS FLASH FLOOD WARNING REPLACES THE PREVIOUS WARNING THAT WAS 
ISSUED FOR THE SAME AREA...AND IS VALID UNTIL 700 AM MST.

* LOCATIONS IMPACTED INCLUDE...PIERCE FERRY ROAD...DIAMOND BAR 
ROAD...MEADVIEW...AND GRAND CANYON 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 BY USING THE TWITTER 
HASHTAG...NWSVEGAS.

&&

LAT...LON 3600 11417 3607 11394 3569 11394 3570 11420

$$

KENNEDY
1 follow-up statement
610 
WGUS75 KVEF 111310
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
610 AM MST TUE SEP 11 2012

AZC015-111309-
/O.CAN.KVEF.FF.W.0198.000000T0000Z-120911T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
610 AM MST TUE SEP 11 2012

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

AT 600 AM MST...RADAR IMAGERY INDICATED THAT THE HEAVY PRECIPITATION 
FROM MEADVIEW TO THE PIERCE FERRY AND ANTARES ROAD JUNCTION HAD 
LARGELY ENDED. FLOOD WATERS IN WASHES...LOW WATER CROSSINGS AND ON 
AREA ROADWAYS SHOULD BE RECEDING. A SIGNIFICANT AMOUNT OF RAIN HAD 
FALLEN...WITH OVER TWO AND A QUARTER INCHES OF RAIN FALLING AT AND 
OBSERVATION SITE NEAR THE DIAMOND BAR AND PIERCE FERRY ROAD JUNCTION 
BETWEEN 315 AM MST AND 500 AM MST.

YOU CAN REPORT FLOODING OR EVIDENCE OF FLOODING BY POSTING YOUR 
REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR 
BY USING THE TWITTER HASHTAG...NWSVEGAS.

LAT...LON 3600 11417 3607 11394 3569 11394 3570 11420

$$

KENNEDY

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 5:35 PM MSTFlash Flood WarningVEFMohave115 min
Sep 11, 3:24 AM MSTFlash Flood WarningVEFMohave111 min
Sep 11, 2:16 PM MSTSevere Thunderstorm WarningVEFMohave44 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.