Alert archive / Nevada / Flash Flood Warnings in 2014

Flash Flood Warning 73, NWS Las Vegas, NV

August 3, 2014Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 3, 2014, 11:31 PM PDT for Clark County, Nevada. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 3, 2014, 11:31 PM PDT (06:31 UTC)
Expired
Aug 4, 2014, 2:30 AM PDT
In force
3 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), 82 km from the middle of the area, began a volume at 06:33 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.

What was reported inside it

TimeReportWhereRemark
Aug 4, 12:30 AM PDTFLASH FLOOD7 Ese Mt. Charleston, NVMT CHARLESTON FIRE REPORTS HARRIS SPRINGS CANYON ROAD WASHED OUT. CREWS RESPONDING TO REPAIR THIS MORNING. TIME ESTIMATED FROM RADAR
Aug 4, 1:00 AM PDTFLASH FLOOD9 Nw Summerlin, NVMT CHARLESTON FIRE REPORTS SECONDARY ROADS WASHED OUT IN LOWER KYLE CANYON. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 6.5 hours before the alert went out and 13 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 2014-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 00:00Z on 2014-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1593 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
33 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.

940 
WGUS55 KVEF 040631
FFWVEF
NVC003-040930-
/O.NEW.KVEF.FF.W.0073.140804T0631Z-140804T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1131 PM PDT SUN AUG 3 2014

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 230 AM PDT

* AT 1125 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM 9 MILES EAST OF KYLE CANYON
  CAMPGROUND...OR 9 MILES NORTH OF RED ROCK CANYON...MOVING NORTHWEST
  AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HARRIS SPRING CANYON...RAINBOW CANYON...KYLE CANYON                
  CAMPGROUND...FLETCHER VIEW CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAIN WILL FALL ON THE CARPENTER ONE BURN AREA. WATER LEVELS 
WILL RISE VERY RAPIDLY...LEADING TO MUD AND DEBRIS FLOWS IN AND 
DOWNSTREAM OF THE BURN AREA.

&&

LAT...LON 3627 11568 3629 11553 3640 11536 3631 11523
      3631 11533 3629 11534 3629 11536 3630 11539
      3625 11540 3623 11543 3621 11547 3619 11553
      3620 11556 3622 11560 3624 11561 3623 11564

$$

BP
2 follow-up statements
408 
WGUS75 KVEF 040718
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1218 AM PDT MON AUG 4 2014

NVC003-040930-
/O.CON.KVEF.FF.W.0073.000000T0000Z-140804T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
1218 AM PDT MON AUG 4 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 1210 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING.  THIS STORM WAS
LOCATED 9 MILES WEST OF FLOYD LAMB PARK...OR 8 MILES NORTHWEST OF 
SUMMERLIN...MOVING WEST AT 5 MPH.

MOST OF THE HEAVY RAIN HAS FALLEN IN HARRIS SPRINGS CANYON AND LOWER 
KYLE CANYON. RUNOFF FROM THIS HEAVY RAIN WILL REACH KYLE CANYON 
DETENTION BASIN.

LOCATIONS IMPACTED INCLUDE...
HARRIS SPRINGS CANYON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
ROADS. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO
CROSS A FLOODED ROAD OR ENTER A FLOOD CHANNEL. TURN AROUND...DONT
DROWN!

REPORT FLOODING TO THE LAS VEGAS NATIONAL WEATHER SERVICE VIA
FACEBOOK OR TWITTER.

&&

LAT...LON 3627 11568 3629 11553 3640 11536 3631 11523
      3631 11533 3629 11534 3629 11536 3630 11539
      3625 11540 3623 11543 3621 11547 3619 11553
      3620 11556 3622 11560 3624 11561 3623 11564

$$

BP
883 
WGUS75 KVEF 040929
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
229 AM PDT MON AUG 4 2014

NVC003-040935-
/O.EXP.KVEF.FF.W.0073.000000T0000Z-140804T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
229 AM PDT MON AUG 4 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 230 AM PDT FOR WEST CENTRAL
CLARK COUNTY...

HEAVY RAIN ENDED ALONG LOWER KYLE CANYON ROAD AROUND 1 AM AND LIGHT 
TO MODERATE SHOWERS WERE DISSIPATING AND MOVING TO THE NORTH. UP TO 
1 INCH OF RAINFALL WAS RECORDED AROUND HARRIS SPRINGS WITHIN THE  
CARPENTER 1 BURN SCAR. RUNOFF AND DEBRIS WILL LIKELY CONTINUE TO 
MAKE IT INTO THE KYLE CANYON DETENTION BASIN BUT THE THREAT OF 
ADDITIONAL HEAVY RAIN AND SIGNIFICANT FLASH FLOODING HAS ENDED FOR 
NOW. THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE ON SCHEDULE 
AT 230 AM. 

LAT...LON 3627 11568 3629 11553 3640 11536 3631 11523
      3631 11533 3629 11534 3629 11536 3630 11539
      3625 11540 3623 11543 3621 11547 3619 11553
      3620 11556 3622 11560 3624 11561 3623 11564

$$

JA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 5:32 PM PDTAreal Flood AdvisoryVEFClark3 hr
Aug 3, 6:08 PM PDTFlash Flood WarningVEFClark3 hr
Aug 3, 7:24 PM PDTFlash Flood WarningVEFClark3 hr
Aug 3, 8:02 PM PDTFlash Flood WarningVEFClark3 hr
Aug 3, 9:05 PM PDTFlash Flood WarningVEFClark3 hr
Aug 3, 9:51 PM PDTFlash Flood WarningVEFClark3 hr
Aug 3, 11:06 PM PDTAreal Flood AdvisoryVEFClark3 hr
Aug 3, 11:17 PM PDTAreal Flood AdvisoryVEFClark3 hr
Aug 3, 11:35 PM PDTFlash Flood WarningVEFClark, Lincoln3 hr
Aug 3, 11:45 PM PDTAreal Flood AdvisoryVEFNye3 hr
Aug 3, 11:58 PM PDTFlash Flood WarningVEFClark3 hr
Aug 4, 2:44 AM PDTAreal Flood AdvisoryVEFNye2 hr
Aug 4, 3:25 AM PDTFlash Flood WarningVEFClark3 hr
Aug 4, 4:58 AM PDTAreal Flood AdvisoryVEFClark3 hr
Aug 4, 12:06 PM PDTFlash Flood WarningVEFClark3 hr
Aug 4, 1:13 PM PDTAreal Flood AdvisoryVEFNye3 hr
Aug 4, 1:21 PM PDTAreal Flood AdvisoryVEFClark114 min
Aug 4, 1:47 PM PDTFlash Flood WarningVEFClark118 min
Aug 4, 2:16 PM PDTFlash Flood WarningVEFClark3 hr
Aug 4, 2:21 PM PDTFlash Flood WarningVEFNye114 min
Aug 4, 2:21 PM PDTFlash Flood WarningVEFClark3 hr
Aug 4, 2:28 PM PDTFlash Flood WarningVEFClark3 hr
Aug 4, 2:57 PM PDTAreal Flood AdvisoryVEFClark, Lincoln5 hr
Aug 4, 3:45 PM PDTFlash Flood WarningVEFEsmeralda, Nye3 hr
Aug 4, 3:56 PM PDTFlash Flood WarningVEFLincoln3 hr
Aug 4, 4:16 PM PDTAreal Flood AdvisoryVEFClark, Nye3 hr

Nearby

Flash Flood Warnings in Nevada, 2014Every flash flood warning in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.