Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 46, NWS Las Vegas, NV

July 15, 2012Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 15, 2012, 4:40 PM PDT for Clark County, Nevada; 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
Jul 15, 2012, 4:40 PM PDT (23:40 UTC)
Expired
Jul 15, 2012, 5:45 PM PDT
In force
65 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

Counties Mohave County, AZ, Clark County, NV

The radar

The Las Vegas radar (KESX), 128 km from the middle of the area, began a volume at 23:43 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, 11.7 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 2012-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 335 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 2012-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
335 J/kg
Mixed-layer CIN
-212 J/kg
Mixed-layer LCL
1353 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
8 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.

595 
WGUS55 KVEF 152340
FFWVEF
AZC015-NVC003-160045-
/O.NEW.KVEF.FF.W.0046.120715T2340Z-120716T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
440 PM MST SUN JUL 15 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...
  EXTREME NORTHEASTERN CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 545 PM MST/545 PM PDT/.

* AT 434 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER NORTH CENTRAL MOHAVE
  COUNTY...OR 14 MILES SOUTH OF MESQUITE. THE STORM PRODUCING VERY
  HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHEASTERN CLARK AND NORTHERN
  MOHAVE COUNTIES.

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 3649 11393 3651 11412 3676 11408 3675 11390

$$

JENSEN
2 follow-up statements
373 
WGUS75 KVEF 160018
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
518 PM MST SUN JUL 15 2012

AZC015-NVC003-160045-
/O.CON.KVEF.FF.W.0046.000000T0000Z-120716T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
518 PM MST SUN JUL 15 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST/545 PM
PDT/ FOR EXTREME NORTHEASTERN CLARK AND NORTH CENTRAL MOHAVE
COUNTIES...

AT 513 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN.  THIS STORM WAS
LOCATED OVER NORTH CENTRAL MOHAVE COUNTY...OR 12 MILES SOUTH OF
MESQUITE. THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF NORTHERN 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 3649 11393 3651 11412 3676 11408 3675 11390

$$

JENSEN
381 
WGUS75 KVEF 160040
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
540 PM MST SUN JUL 15 2012

AZC015-NVC003-160049-
/O.EXP.KVEF.FF.W.0046.000000T0000Z-120716T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
540 PM MST SUN JUL 15 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST/545 PM PDT/ FOR
EXTREME NORTHEASTERN CLARK AND NORTH CENTRAL MOHAVE COUNTIES...

THE FLASH FLOOD WARNING WILL EXPIRE AS OF 545 PM PDT/ 545 PM MST 
HOWEVER THE MOHAVE COUNTY PORTION WILL BE INCLUDED IN A NEW WARNING 
THAT WILL BE ISSUED SHORTLY DUE TO CONTINUED HEAVY RAINFALL IN 
MOHAVE COUNTY.

LAT...LON 3649 11393 3651 11412 3676 11408 3675 11390

$$

JENSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 6:02 PM PDTAreal Flood AdvisoryVEFClark116 min
Jul 14, 8:41 PM PDTAreal Flood AdvisoryVEFClark16 min
Jul 14, 8:56 PM PDTFlash Flood WarningVEFClark109 min
Jul 15, 10:14 AM PDTFlash Flood WatchVEFClark, Lincoln, Nye11 hr
Jul 15, 10:30 AM PDTFlash Flood WarningVEFLincoln4 hr
Jul 15, 1:12 PM PDTFlash Flood WarningVEFClark2 hr
Jul 15, 1:24 PM PDTFlash Flood WarningVEFNye4 hr
Jul 15, 1:58 PM PDTFlash Flood WarningVEFLincoln82 min
Jul 15, 2:16 PM PDTSevere Thunderstorm WarningVEFClark44 min
Jul 15, 2:41 PM PDTAreal Flood AdvisoryVEFClark3 hr
Jul 15, 3:01 PM PDTFlash Flood WarningVEFLincoln6 hr
Jul 15, 4:58 PM PDTFlash Flood WarningVEFClark92 min
Jul 14, 5:10 PM PDTFlash Flood WarningVEFMohave3 hr
Jul 14, 5:30 PM PDTFlash Flood WarningVEFMohave2 hr
Jul 14, 6:36 PM PDTFlash Flood WarningVEFMohave114 min
Jul 14, 8:20 PM PDTFlash Flood WarningVEFMohave115 min
Jul 14, 10:01 PM PDTFlash Flood WarningVEFMohave3 hr
Jul 15, 12:53 PM PDTFlash Flood WarningVEFMohave2 hr

Nearby

Flash Flood Warnings in Nevada, 2012Flash 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.