Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 80, NWS Las Vegas, NV

July 31, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 3:24 PM MST for Mohave County, Arizona. It was in force for 111 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: Jul 31, 2012, 3:24 PM MST (22:24 UTC)
Expired: Jul 31, 2012, 5:15 PM MST
In force: 111 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Mohave County, AZ

The radar

The Cedar City radar (KICX), 126 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 159 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.

258 
WGUS55 KVEF 312224
FFWVEF
AZC015-010015-
/O.NEW.KVEF.FF.W.0080.120731T2224Z-120801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
324 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 515 PM MST.

* AT 321 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER NORTH CENTRAL MOHAVE
  COUNTY...OR 11 MILES SOUTHEAST OF MESQUITE...MOVING NORTHWEST AT 5
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHERN MOHAVE COUNTY INCLUDING ROADS
  IN THE GRAND CANYON-PARASHANT NATIONAL MONUMENT BETWEEN
  WOLF HOLE AND WHITNEY PASS.

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 3678 11400 3687 11374 3685 11365 3666 11360
      3664 11399

$$

JA

2 follow-up statements

624 
WGUS75 KVEF 312345
FFSVEF

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

AZC015-010015-
/O.CON.KVEF.FF.W.0080.000000T0000Z-120801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
445 PM MST TUE JUL 31 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MST FOR NORTH
CENTRAL MOHAVE COUNTY...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN ENDED 
NEAR THE VIRGIN MOUNTAINS IN NORHTWEST MOHAVE COUNTY AROUND 4 PM. 
RUNOFF FROM THESE STORMS WILL CONTINUE TO FLOW THROUGH WASHES AND 
POSSIBLY ACROSS SECONDARY ROADS ALONG THE NORTHWEST AND EAST FACING 
SLOPES OF THE VIRGIN MOUNTAINS THROUGH 515 PM MOST.

LOCATIONS IMPACTED INCLUDE...
REMOTE ROADS IN THE GRAND CANYON-PARASHANT NATIONAL MONUMET NEAR 
WHITNEY PASS.

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 3678 11400 3687 11374 3685 11365 3666 11360
      3664 11399

$$

JA

967 
WGUS75 KVEF 010009
FFSVEF

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

AZC015-010016-
/O.EXP.KVEF.FF.W.0080.000000T0000Z-120801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
509 PM MST TUE JUL 31 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MST FOR NORTH
CENTRAL MOHAVE COUNTY...

RUNOFF FROM EARLIER HEAVY RAIN OVER THE VIRGIN MOUNTAINS HAS LIKELY 
RECEDED AND THE FLASH FLOODING WARNING WILL BE ALLOWED TO EXPIRE ON 
SCHEDULE.

LAT...LON 3678 11400 3687 11374 3685 11365 3666 11360
      3664 11399

$$

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, 2:48 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jul 31, 3:12 PM MST	Areal Flood Advisory	VEF	Mohave	113 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.