Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 78, NWS Las Vegas, NV

July 31, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 2:48 PM MST for Mohave County, Arizona. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 31, 2012, 2:48 PM MST (21:48 UTC)
Expired: Jul 31, 2012, 5:45 PM MST
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Mohave County, AZ

The radar

The Cedar City radar (KICX), 103 km from the middle of the area, began a volume at 21:50 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, 9.8 hours before the alert went out and 187 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: 121 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1334 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: -43 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.

475 
WGUS55 KVEF 312148
FFWVEF
AZC015-010045-
/O.NEW.KVEF.FF.W.0078.120731T2148Z-120801T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
248 PM MST TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 545 PM MST.

* AT 244 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER NORTH CENTRAL MOHAVE
  COUNTY...OR 25 MILES SOUTH OF ST GEORGE...MOVING NORTH AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHERN MOHAVE COUNTY INCLUDING THE MOUNT
  TRUMBALL LOOP 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 3685 11365 3700 11356 3700 11340 3682 11337
      3662 11339 3662 11359

$$

JA

2 follow-up statements

640 
WGUS75 KVEF 312257
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
357 PM MST TUE JUL 31 2012

AZC015-010045-
/O.CON.KVEF.FF.W.0078.000000T0000Z-120801T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
357 PM MST TUE JUL 31 2012

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

NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED AROUND 2 INCHES OF 
RAIN FELL OVER NORTH CENTRAL MOHAVE COUNTY BEFORE THUNDERSTORMS 
MOVED AWAY TO THE NORTHWEST. RUNOFF WILL IMPACT THE MOUNT TRUMBULL 
LOOP ROAD SOUTH OF WOLF HOLE. WASHES WILL CARRY WATER TO THE NORTH 
TOWARD THE UTAH BORDER THROUGH 545 PM MST. 

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 3685 11365 3688 11354 3700 11352 3700 11340
      3682 11337 3662 11339 3662 11359

$$

JA

533 
WGUS75 KVEF 010043
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
543 PM MST TUE JUL 31 2012

AZC015-010049-
/O.EXP.KVEF.FF.W.0078.000000T0000Z-120801T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
543 PM MST TUE JUL 31 2012

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

NO ADDITIONAL RAINFALL HAS OCCURRED SINCE 330 PM OVER NORTH CENTRAL 
MOHAVE COUNTY NEAR WOLF HOLE AND THE MOUNT TRUMBULL LOOP ROAD. 
RUNOFF FROM THE EARLIER HEAVY RAINFALL HAS LIKELY RECEDED AND THE 
FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE ON SCHEDULE.

LAT...LON 3685 11365 3688 11354 3700 11352 3700 11340
      3682 11337 3662 11339 3662 11359

$$

JA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 2:29 AM MST	Flash Flood Watch	VEF	Mohave	19 hr
Jul 31, 12:14 PM MST	Areal Flood Advisory	VEF	Mohave	83 min
Jul 31, 1:55 PM MST	Flash Flood Warning	VEF	Mohave	2 hr
Jul 31, 2:21 PM MST	Flash Flood Warning	VEF	Mohave	114 min
Jul 31, 2:42 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 31, 3:12 PM MST	Areal Flood Advisory	VEF	Mohave	113 min
Jul 31, 3:24 PM MST	Flash Flood Warning	VEF	Mohave	111 min
Jul 31, 4:15 PM MST	Flash Flood Warning	VEF	Mohave	2 hr
Jul 31, 4:29 PM MST	Flash Flood Warning	VEF	Mohave	2 hr

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.