Alert archive / Nevada / Flash Flood Warnings in 2013

Flash Flood Warning 9, NWS Las Vegas, NV

July 12, 2013Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 12, 2013, 12:08 PM PDT for Clark County, Nevada; Mohave County, Arizona. 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
Jul 12, 2013, 12:08 PM PDT (19:08 UTC)
Expired
Jul 12, 2013, 3:00 PM PDT
In force
3 hr
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), 28 km from the middle of the area, began a volume at 19:08 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
Jul 12, 12:09 PM PDTFLASH FLOOD5 E Nelson Peak (Npkn2), NVHIGHWAY 165 WASHED OUT JUST PAST THE TOWN OF NELSON. DEBRIS FLOW DOWN THE CANYON IS 100FT WIDE AND 6FT DEEP. 14 CARS ARE STRANDED BEYOND THE WASHOUTS
Jul 12, 1:00 PM PDTFLASH FLOOD10 E Nelson Peak (Npkn2, NVHWY 165 WASHED OUT NEAR THE CLIFFS

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 12:00Z, 7.1 hours before the alert went out and 96 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 2013-07-12Temperature 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 2013-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 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
2091 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
12 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.

451 
WGUS55 KVEF 121908
FFWVEF
AZC015-NVC003-122200-
/O.NEW.KVEF.FF.W.0009.130712T1908Z-130712T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1208 PM MST FRI JUL 12 2013

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 300 PM MST/300 PM PDT/.

* AT 1205 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  VERY HEAVY RAIN FALLING FROM THUNDERSTORMS FROM NEAR TEMPLE BAR    
  ROAD SOUTHWEST TOWARD THE EASTERN END OF NELSONS LANDING ROAD.

* LOCATIONS IMPACTED INCLUDE...
  TEMPLE BAR ROAD AND THE EASTERN END OF NELSONS LANDING 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 ON TWITTER USING...AT 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 3586 11487 3609 11471 3613 11437 3581 11440
      3551 11479

$$

STACHELSKI
1 follow-up statement
969 
WGUS75 KVEF 122129
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
229 PM MST FRI JUL 12 2013

AZC015-NVC003-122138-
/O.CAN.KVEF.FF.W.0009.000000T0000Z-130712T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
229 PM MST FRI JUL 12 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL CLARK AND
WEST CENTRAL MOHAVE COUNTIES...

THUNDERSTORMS OVER FAR NORTHWESTERN AND FAR EASTERN PORTIONS OF 
SOUTHERN CLARK COUNTY HAVE WEAKENED. ANY HEAVY RAIN IN THE TEMPLE 
BAR ROAD AND NELSONS LANDING AREA HAS LONG ENDED AND ANY RUNOFF FROM 
EARLIER SHOULD HAVE SUBSIDED. THEREFORE THE FLASH FLOOD WARNING FOR 
THIS AREA HAS BEEN CANCELLED.

LAT...LON 3586 11487 3609 11471 3613 11437 3581 11440
      3551 11479

$$

STACHELSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 11:12 AM PDTFlash Flood WarningVEFClark2 hr
Jul 12, 11:16 AM PDTFlash Flood WarningVEFClark4 hr
Jul 12, 12:38 PM PDTFlash Flood WarningVEFClark112 min
Jul 12, 1:14 PM PDTFlash Flood WarningVEFClark2 hr
Jul 12, 2:01 PM PDTFlash Flood WarningVEFLincoln3 hr
Jul 12, 3:16 PM PDTFlash Flood WarningVEFClark3 hr
Jul 12, 3:28 PM PDTFlash Flood WarningVEFLincoln2 hr
Jul 12, 10:28 AM PDTAreal Flood AdvisoryVEFMohave3 hr
Jul 12, 12:42 PM PDTFlash Flood WarningVEFMohave2 hr
Jul 12, 1:52 PM PDTFlash Flood WarningVEFMohave113 min
Jul 12, 3:21 PM PDTFlash Flood WarningVEFMohave114 min
Jul 12, 3:56 PM PDTFlash Flood WarningVEFMohave2 hr

Nearby

Flash Flood Warnings in Nevada, 2013Flash Flood Warnings in Arizona, 2013Every flash flood warning in 2013

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.