Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 180, NWS Las Vegas, NV

September 4, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 4, 2012, 2:36 PM MST for Mohave County, Arizona. It was in force for 114 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 4, 2012, 2:36 PM MST (21:36 UTC)
Expired
Sep 4, 2012, 4:30 PM MST
In force
114 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), 149 km from the middle of the area, began a volume at 21:36 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 4, 3:27 PM MSTHEAVY RAIN 310 Ssw Mt. Trumbull, AZTRAINED SPOTTER AT BAR TEN RANCH REPORTED 3 INCHES OF RAIN IN THE LAST HOUR.

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

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.6 hours before the alert went out and 173 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 2012-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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 2012-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 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
188 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
1448 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
-2 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.

188 
WGUS55 KVEF 042136
FFWVEF
AZC015-042330-
/O.NEW.KVEF.FF.W.0180.120904T2136Z-120904T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
236 PM MST TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 430 PM MST.

* AT 230 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR BAR TEN RANCH...OR 53     
  MILES SOUTH OF COLORADO CITY. THE STORM PRODUCING VERY HEAVY RAIN  
  WAS NEARLY STATIONARY. EXTREMELY HEAVY RAIN ALONG WITH A FEW       
  INCHES OF STANDING WATER WAS REPORTED RECENTLY BY THE STAFF AT THE 
  BAR TEN RANCH.

* LOCATIONS IMPACTED INCLUDE...
  BAR TEN 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.

CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY
RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF
FLASH FLOODING IS OBSERVED.

&&

LAT...LON 3605 11348 3616 11353 3635 11313 3619 11309

$$

STACHELSKI
2 follow-up statements
017 
WGUS75 KVEF 042228
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
328 PM MST TUE SEP 4 2012

AZC015-042330-
/O.CON.KVEF.FF.W.0180.000000T0000Z-120904T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
328 PM MST TUE SEP 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 325 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN.  THIS STORM WAS
LOCATED NEAR BAR TEN RANCH...OR 51 MILES SOUTH OF COLORADO CITY. THE 
THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY. THE BAR TEN 
RANCH MEASURED 3 INCHES OF RAIN FROM THIS STORM IN ROUGHLY THE LAST 
HOUR.

LOCATIONS IMPACTED INCLUDE...
THE BAR TEN 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 3605 11348 3616 11353 3635 11313 3619 11309

$$

STACHELSKI
004 
WGUS75 KVEF 042329
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
429 PM MST TUE SEP 4 2012

AZC015-042338-
/O.EXP.KVEF.FF.W.0180.000000T0000Z-120904T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
429 PM MST TUE SEP 4 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM MST FOR CENTRAL
MOHAVE COUNTY...

THUNDERSTORMS WITH HEAVY RAIN HAVE WEAKENED IN THE BAR TEN RANCH 
AREA. THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM MST.

LAT...LON 3605 11348 3616 11353 3635 11313 3619 11309

$$

PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 10:48 AM MSTFlash Flood WarningVEFMohave117 min
Sep 4, 12:11 PM MSTFlash Flood WarningVEFMohave64 min
Sep 4, 2:54 PM MSTFlash Flood WarningVEFMohave2 hr
Sep 4, 3:47 PM MSTFlash Flood WarningVEFMohave34 min
Sep 4, 4:50 PM MSTSevere Thunderstorm WarningVEFMohave40 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.