Alert archive / Nevada / Flash Flood Warnings in 2011

Flash Flood Warning 32, NWS Las Vegas, NV

July 7, 2011Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 7, 2011, 1:16 PM PDT for Clark County, Nevada. It was in force for 119 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 7, 2011, 1:16 PM PDT (20:16 UTC)
Expired: Jul 7, 2011, 3:15 PM PDT
In force: 119 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), 111 km from the middle of the area, began a volume at 20:16 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, 8.3 hours before the alert went out and 16 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: 34 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 2113 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 114 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.

531 
WGUS55 KVEF 072016
FFWVEF
NVC003-072215-
/O.NEW.KVEF.FF.W.0032.110707T2016Z-110707T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
116 PM PDT THU JUL 7 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 315 PM PDT.

* AT 111 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER WEST CENTRAL CLARK
  COUNTY...OR 11 MILES NORTH OF MT. CHARLESTON. THE STORM PRODUCING  
  VERY HEAVY RAIN WAS NEARLY STATIONARY. RAIN GAUGES NEAR COLD CREEK 
  REPORT THERE QUARTERS OF AN INCH OF RAIN SINCE 1245 PM WITH THIS 
  STORM. 

* THE STORM PRODUCING VERY HEAVY RAIN WILL REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED 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 TWITTER #NWSVEGAS.

&&

LAT...LON 3640 11575 3648 11574 3651 11573 3653 11568
      3656 11563 3647 11550 3640 11564

$$

JGG

2 follow-up statements

421 
WGUS75 KVEF 072028
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
128 PM PDT THU JUL 7 2011

NVC003-072215-
/O.CON.KVEF.FF.W.0032.000000T0000Z-110707T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
128 PM PDT THU JUL 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 122 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN.  THIS STORM WAS
LOCATED OVER WEST CENTRAL CLARK COUNTY...OR 14 MILES NORTH OF MT.
CHARLESTON. THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY
STATIONARY. RAIN GAUGES REPORT NEARLY ONE INCH OF RAIN HAS FALLEN 
SINCE 1230 PM AT COLD CREEK.

LOCATIONS IMPACTED INCLUDE COLD CREEK AND COLD CREEK 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 TWITTER #NWSVEGAS.

&&

LAT...LON 3640 11575 3648 11574 3651 11573 3653 11568
      3656 11563 3647 11550 3640 11564

$$

JGG

469 
WGUS75 KVEF 072117
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
217 PM PDT THU JUL 7 2011

NVC003-072215-
/O.CON.KVEF.FF.W.0032.000000T0000Z-110707T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
217 PM PDT THU JUL 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 213 PM PDT...RADAR INDICATED ANOTHER AREA OF MODERATE TO HEAVY 
RAIN MOVING INTO THE COLD CREEK ROAD AREA. THIS WILL FURTHER 
AGGRAVATE ANY EXISTING FLOODING. ANOTHER ONE HALF INCH OF RAIN WILL 
BE POSSIBLE IN ADDITION TO AROUND ONE TO POSSIBLY ONE AND ONE HALF 
INCHES OF RAIN THAT HAS ALREADY FALLEN IN THE AREA SINCE 1230 PM.

LOCATIONS IMPACTED INCLUDE COLD CREEK ROAD AND THE COLD CREEK AREA.

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 3648 11552 3641 11565 3640 11575 3648 11574
      3651 11573 3653 11568 3656 11563

$$

JGG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 5:48 PM PDT	Areal Flood Advisory	VEF	Clark, Nye	71 min
Jul 7, 1:01 PM PDT	Areal Flood Advisory	VEF	Clark	43 min
Jul 7, 2:54 PM PDT	Severe Thunderstorm Warning	VEF	Clark	51 min
Jul 7, 3:01 PM PDT	Severe Thunderstorm Warning	VEF	Clark	33 min
Jul 7, 3:18 PM PDT	Severe Thunderstorm Warning	VEF	Clark	42 min
Jul 7, 3:32 PM PDT	Severe Thunderstorm Warning	VEF	Clark	43 min
Jul 7, 3:35 PM PDT	Flash Flood Warning	VEF	Clark	114 min
Jul 7, 4:26 PM PDT	Areal Flood Advisory	VEF	Clark	74 min
Jul 7, 4:29 PM PDT	Severe Thunderstorm Warning	VEF	Clark	46 min
Jul 7, 4:37 PM PDT	Flash Flood Warning	VEF	Clark	53 min
Jul 7, 4:52 PM PDT	Flash Flood Warning	VEF	Clark	113 min

Nearby

Flash Flood Warnings in Nevada, 2011 Every 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.