Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 144, NWS Las Vegas, NV

August 22, 2012Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2012, 12:12 AM PDT for Clark County, Nevada. It was in force for 2 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
Aug 22, 2012, 12:12 AM PDT (07:12 UTC)
Expired
Aug 22, 2012, 2:15 AM PDT
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Clark County, NV

The radar

The Las Vegas radar (KESX), 94 km from the middle of the area, began a volume at 07:13 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 00:00Z, 7.2 hours before the alert went out and 14 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 00:00Z on 2012-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2012-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3181 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

792 
WGUS55 KVEF 220712
FFWVEF
NVC003-220915-
/O.NEW.KVEF.FF.W.0144.120822T0712Z-120822T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1212 AM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 215 AM PDT.

* AT 1209 AM PDT...TRAINED WEATHER SPOTTERS REPORTED VERY HEAVY 
  RAIN FROM A THUNDERSTORM OVER MT. CHARLESTON NEAR FLETCHER VIEW 
  CAMPGROUND...MOVING NORTHEAST AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MT. CHARLESTON...FLETCHER VIEW CAMPGROUND...KYLE CANYON
  CAMPGROUND...MAHOGANY GROVE CAMPGROUND AND HILLTOP CAMPGROUND.

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 SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY RISING WATER 
AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND.

&&

LAT...LON 3630 11570 3635 11560 3625 11554 3621 11570

$$

JA
2 follow-up statements
737 
WGUS75 KVEF 220803
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
103 AM PDT WED AUG 22 2012

NVC003-220915-
/O.CON.KVEF.FF.W.0144.000000T0000Z-120822T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
103 AM PDT WED AUG 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM PDT FOR WEST
CENTRAL CLARK COUNTY...

RAINFALL ENDED BETWEEN 1230 AND 100 AM AROUND THE MOUNT CHARLESTON 
AREA BUT RUNOFF FROM EARLIER ESTIMATED RAINFALL AMOUNTS UP TO ONE 
INCH WILL PRODUCE WATER FLOWING IN WASHES.

LOCATIONS IMPACTED INCLUDE...
FLETCHER VIEW CAMPGROUND...KYLE CANYON CAMPGROUND...MAHOGANY GROVE 
CAMPGROUND AND HILLTOP CAMPGROUND.

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 SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY RISING WATER 
AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND.

&&

LAT...LON 3630 11570 3635 11560 3625 11554 3621 11570

$$

JA
922 
WGUS75 KVEF 220908
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
208 AM PDT WED AUG 22 2012

NVC003-220915-
/O.EXP.KVEF.FF.W.0144.000000T0000Z-120822T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
208 AM PDT WED AUG 22 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 215 AM PDT FOR WEST CENTRAL
CLARK COUNTY...

NO ADDITIONAL RAINFALL HAS OCCURRED AROUND KYLE CANYON SINCE BEFORE
100 AM AND RUNOFF FROM THE HEAVY RAIN THAT FELL EARLIER HAS LIKELY 
RECEDED. THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE ON 
SCHEDULE.

LAT...LON 3630 11570 3635 11560 3625 11554 3621 11570

$$

JA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 6:10 PM PDTFlash Flood WarningVEFClark, Lincoln2 hr
Aug 21, 6:47 PM PDTFlash Flood WarningVEFLincoln118 min
Aug 22, 2:35 AM PDTFlash Flood WarningVEFClark115 min
Aug 22, 8:22 AM PDTAreal Flood AdvisoryVEFClark9 hr
Aug 22, 9:19 AM PDTAreal Flood AdvisoryVEFClark, Lincoln, Nye3 hr
Aug 22, 9:20 AM PDTFlash Flood WarningVEFClark101 min
Aug 22, 9:34 AM PDTFlash Flood WarningVEFClark116 min
Aug 22, 9:59 AM PDTFlash Flood WarningVEFClark59 min
Aug 22, 10:05 AM PDTFlash Flood WarningVEFEsmeralda76 min
Aug 22, 10:53 AM PDTFlash Flood WarningVEFClark4 hr
Aug 22, 12:12 PM PDTFlash Flood WarningVEFClark4 hr
Aug 22, 12:33 PM PDTFlash Flood WarningVEFClark117 min
Aug 22, 2:40 PM PDTAreal Flood AdvisoryVEFClark6 hr
Aug 22, 3:43 PM PDTFlash Flood WarningVEFClark2 hr

Nearby

Flash Flood Warnings in Nevada, 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.