Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 185, NWS Las Vegas, NV

September 4, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 4, 2012, 7:22 PM MST for Mohave County, Arizona. It was in force for 113 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 4, 2012, 7:22 PM MST (02:22 UTC)
Expired: Sep 4, 2012, 9:15 PM MST
In force: 113 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), 188 km from the middle of the area, began a volume at 02:24 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

Phoenix, AZ (KPSR), launched 00:00Z, 2.4 hours before the alert went out and 182 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 386 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 2024 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: -20 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.

313 
WGUS55 KVEF 050222
FFWVEF
AZC015-050415-
/O.NEW.KVEF.FF.W.0185.120905T0222Z-120905T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 915 PM MST.

* AT 716 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM THUNDERSTORMS OVER EXTREME SOUTHEAST          
  MOHAVE COUNTY...OR 20 MILES SOUTH OF WIKIEUP. THE                  
  STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...NUMEROUS NORMALLY DRY WASHES THAT 
  DRAIN INTO THE BIG SANDY RIVER AND BURRO CREEK IN FAR SOUTHEAST MOHAVE
  COUNTY. 

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 3465 11380 3457 11354 3446 11337 3429 11334
      3429 11343 3430 11350 3430 11352 3428 11354
      3427 11376

$$

PIERCE

2 follow-up statements

554 
WGUS75 KVEF 050319
FFSVEF

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

AZC015-050415-
/O.CON.KVEF.FF.W.0185.000000T0000Z-120905T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
819 PM MST TUE SEP 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST FOR SOUTH
CENTRAL MOHAVE COUNTY...

AT 812 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS THAT PRODUCED VERY HEAVY RAIN IN THE AREA ARE 
WEAKENING. RUNOFF IN NORMALLY DRY WASHES THAT FEED INTO THE BIG 
SANDY RIVER AND BURRO CREEK WILL CONTINUE.

LOCATIONS IMPACTED INCLUDE...MAINLY RURAL AREAS OF SOUTHEAST MOHAVE 
COUNTY.

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 3465 11380 3457 11354 3446 11337 3429 11334
      3429 11343 3430 11350 3430 11352 3428 11354
      3427 11376

$$

PIERCE

743 
WGUS75 KVEF 050412
FFSVEF

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

AZC015-050421-
/O.EXP.KVEF.FF.W.0185.000000T0000Z-120905T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
912 PM MST TUE SEP 4 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MST FOR SOUTH
CENTRAL MOHAVE COUNTY...

THUNDERSTORMS HAVE BEEN WEAKENING OVER FAR SOUTHEAST MOHAVE COUNTY 
SINCE 815 PM. THE FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MST.

LAT...LON 3465 11380 3457 11354 3446 11337 3429 11334
      3429 11343 3430 11350 3430 11352 3428 11354
      3427 11376

$$

PIERCE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 6:10 PM MST	Areal Flood Advisory	VEF	Mohave	66 min
Sep 4, 6:46 PM MST	Flash Flood Warning	VEF	Mohave	119 min
Sep 5, 2:54 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Sep 5, 3:08 PM MST	Flash Flood Warning	VEF	Mohave	57 min
Sep 5, 4:24 PM MST	Severe Thunderstorm Warning	VEF	Mohave	40 min

Nearby

Flash Flood Warnings in Arizona, 2012 Every 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.