Alert archive / Nevada / Flash Flood Warnings in 2011

Flash Flood Warning 17, NWS Las Vegas, NV

July 5, 2011Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 5, 2011, 3:01 PM PDT for Clark County, Nevada. It was in force for 89 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 5, 2011, 3:01 PM PDT (22:01 UTC)
Expired
Jul 5, 2011, 4:30 PM PDT
In force
89 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Clark County, NV

The radar

The Las Vegas radar (KESX), 105 km from the middle of the area, began a volume at 22:03 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, 10.0 hours before the alert went out and 11 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 2011-07-05Temperature 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 12:00Z on 2011-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
2419 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
137 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.

238 
WGUS55 KVEF 052201
FFWVEF
NVC003-052330-
/O.NEW.KVEF.FF.W.0017.110705T2201Z-110705T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
301 PM PDT TUE JUL 5 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 430 PM PDT.

* AT 253 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 7 MILES NORTHEAST OF DOLOMITE
  CAMPGROUND...OR 8 MILES NORTH OF MT. CHARLESTON. THE STORM
  PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...MCWILLIAMS CAMPGROUND AND DOLOMITE
  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 TWITTER #NWSVEGAS.

CAMPERS AND HIKERS SHOULD BE ALERT TO THE POSSIBILITY OF RAPIDLY
RISING WATER AND BE PREPARED TO MOVE QUICKLY TO HIGHER GROUND IF
FLASH FLOODING IS OBSERVED.

&&

LAT...LON 3640 11571 3652 11574 3654 11555 3641 11545
      3629 11569

$$

JENSEN
2 follow-up statements
751 
WGUS75 KVEF 052250
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
350 PM PDT TUE JUL 5 2011

NVC003-052330-
/O.CON.KVEF.FF.W.0017.000000T0000Z-110705T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
350 PM PDT TUE JUL 5 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 341 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM CONTINUING TO PRODUCE HEAVY RAIN.  THIS 
STORM WAS LOCATED NEAR DOLOMITE CAMPGROUND...OR NEAR MT. CHARLESTON. 
THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY.

ALTHOUGH THERE HAVE NOT BEEN REPORTS OF FLOODING IN THIS 
AREA...HEAVY RAINFALL IS LIKELY CREATING FLOWING WATER THROUGH THE 
AREA. HIKERS AND CAMPERS SHOULD BE ESPECIALLY CAUTIOUS.

LOCATIONS IMPACTED INCLUDE...MCWILLIAMS CAMPGROUND AND DOLOMITE
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 TWITTER #NWSVEGAS.

&&

LAT...LON 3640 11571 3652 11574 3654 11555 3641 11545
      3629 11569

$$

JENSEN
660 
WGUS75 KVEF 052326
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
426 PM PDT TUE JUL 5 2011

NVC003-052332-
/O.EXP.KVEF.FF.W.0017.000000T0000Z-110705T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
426 PM PDT TUE JUL 5 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM PDT FOR WEST CENTRAL
CLARK COUNTY...

THUNDERSTORMS HAVE MOVED OUT OF THE AREA AND ALTHOUGH VERY LIGHT 
RAIN MAY BE SEEN INTO THE EVENING HOURS...HEAVY RAINFALL IS NO 
LONGER EXPECTED.

CAMPERS AND TRAVELERS...ESPECIALLY IN THE MCWILLIAMS CAMPGROUND AND 
DOLOMITE CAMPGROUND SHOULD CONTINUE TO USE CAUTION AS FLOWING WATER 
WILL LIKELY BE SEEN IN THE NORMALLY DRY WASHES AND POSSIBLY 
ACROSS LOW WATER CROSSINGS INTO THE EVENING HOURS.

LAT...LON 3640 11571 3652 11574 3654 11555 3641 11545
      3629 11569

$$

JENSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 12:14 PM PDTFlash Flood WarningVEFClark76 min
Jul 5, 12:54 PM PDTSevere Thunderstorm WarningVEFClark36 min
Jul 5, 1:12 PM PDTFlash Flood WarningVEFClark2 hr
Jul 5, 2:01 PM PDTSevere Thunderstorm WarningVEFClark33 min
Jul 5, 2:21 PM PDTFlash Flood WarningVEFClark114 min
Jul 5, 3:09 PM PDTFlash Flood WarningVEFClark2 hr
Jul 5, 3:46 PM PDTAreal Flood AdvisoryVEFClark, Esmeralda, Lincoln, Nye119 min
Jul 5, 4:10 PM PDTFlash Flood WarningVEFClark110 min

Nearby

Flash Flood Warnings in Nevada, 2011Every flash flood warning in 2011

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.