Alert archive / Nevada / Flash Flood Warnings in 2014

Flash Flood Warning 113, NWS Las Vegas, NV

August 14, 2014Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 14, 2014, 11:04 AM 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
Aug 14, 2014, 11:04 AM PDT (18:04 UTC)
Expired
Aug 14, 2014, 2:00 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), 41 km from the middle of the area, began a volume at 18:05 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 14, 11:45 AM PDTFLASH FLOOD3 Nne Boulder City, NVTRAINED SPOTTER REPORTS OVER 6 INCHES OF WATER FLOWING ACROSS ROAD ON LAKESHORE DR. NORTH OF THE LAKE MEAD RECREATIONAL AREA ENTRANCE. ROAD HAS BEEN SHUT DOWN AT THIS TIME.
Aug 14, 1:00 PM PDTFLASH FLOOD1 N Boulder City, NVA MUDSLIDE TOOK PLACE NEAR ISABEL AND ROBINSON LANE. ROCKS AND MUD LANDED ON THE STREETS.

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, 6.1 hours before the alert went out and 74 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 2014-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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 12:00Z on 2014-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
7 J/kg
Mixed-layer CIN
-314 J/kg
Mixed-layer LCL
2230 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
39 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.

113 
WGUS55 KVEF 141804
FFWVEF
AZC015-NVC003-142100-
/O.NEW.KVEF.FF.W.0113.140814T1804Z-140814T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1104 AM PDT THU AUG 14 2014

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 200 PM PDT/200 PM MST/

* AT 1100 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM NEAR BOULDER CITY. THE STORM   
  PRODUCING FLASH FLOODING WAS NEARLY STATIONARY. RAINFALL RATES UP 
  TO AN INCH AN HOUR HAVE BEEN REPORTED WITH THIS STORM. 

* LOCATIONS IMPACTED INCLUDE...
  LAS VEGAS BAY...LAKE LAS VEGAS...BOULDER BEACH CAMPGROUND...BOULDER
  BEACH...HOOVER DAM...LAS VEGAS BAY CAMPGROUND...CALLVILLE BAY AND
  CALLVILLE BAY CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON ROADS...IN NORMALLY DRY WASHES AND LOW
LYING AREAS. 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 3611 11494 3614 11483 3620 11464 3591 11460
      3589 11493

$$

STUMPF
3 follow-up statements
036 
WGUS75 KVEF 141857
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1157 AM PDT THU AUG 14 2014

AZC015-NVC003-142100-
/O.CON.KVEF.FF.W.0113.000000T0000Z-140814T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
1157 AM PDT THU AUG 14 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT/200 PM
MST/ FOR CENTRAL CLARK AND EXTREME WEST CENTRAL MOHAVE COUNTIES...

AT 1150 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING NEAR BOULDER BEACH 
AND THE OVER THE REST OF THE WARNED AREA. TRAINED SPOTTER REPORTED 
WATER ACROSS LAKE SHORE DRIVE AND RANGERS HAVE CLOSED PARTS OF THE 
ROAD.

LOCATIONS IMPACTED INCLUDE...
LAS VEGAS BAY...LAKE LAS VEGAS...CALLVILLE BAY...CALLVILLE BAY
CAMPGROUND AND LAS VEGAS BAY CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON ROADS...IN NORMALLY DRY WASHES AND LOW
LYING AREAS. 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 3611 11494 3614 11483 3620 11464 3591 11460
      3589 11493

$$

STUMPF
715 
WGUS75 KVEF 141930
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1230 PM PDT THU AUG 14 2014

AZC015-NVC003-142100-
/O.CON.KVEF.FF.W.0113.000000T0000Z-140814T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
1230 PM PDT THU AUG 14 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT/200 PM
MST/ FOR CENTRAL CLARK AND EXTREME WEST CENTRAL MOHAVE COUNTIES...

AT 1223 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
ADDITIONAL THUNDERSTORMS ARE MOVING INTO THE WARNED AREA. HEAVY RAIN 
FROM THESE STORMS AND ANY ADDITIONAL RUNOFF WILL CONTINUE THE THREAT 
OF FLASH FLOODING OVER THE WARNED AREA.

LOCATIONS IMPACTED INCLUDE...
LAS VEGAS BAY...LAKE LAS VEGAS...CALLVILLE BAY...CALLVILLE BAY
CAMPGROUND AND LAS VEGAS BAY CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON ROADS...IN NORMALLY DRY WASHES AND LOW
LYING AREAS. 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 3611 11494 3614 11483 3620 11464 3591 11460
      3589 11493

$$

STUMPF
349 
WGUS75 KVEF 142051
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
151 PM PDT THU AUG 14 2014

AZC015-NVC003-142100-
/O.EXP.KVEF.FF.W.0113.000000T0000Z-140814T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-CLARK NV-
151 PM PDT THU AUG 14 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 200 PM PDT/200 PM MST/ FOR
CENTRAL CLARK AND EXTREME WEST CENTRAL MOHAVE COUNTIES...

THUNDERSTORMS HAVE WEAKENED AND MOVED OUT OF THE WARNED AREA. THE 
IMMEDIATE THREAT OF FLASH FLOODING HAS ENDED.

LAT...LON 3611 11494 3614 11483 3620 11464 3591 11460
      3589 11493

$$

STUMPF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 6:00 PM PDTAreal Flood AdvisoryVEFClark90 min
Aug 14, 11:36 AM PDTAreal Flood AdvisoryVEFMohave5 hr
Aug 14, 4:21 PM PDTAreal Flood AdvisoryVEFMohave3 hr

Nearby

Flash Flood Warnings in Nevada, 2014Flash Flood Warnings in Arizona, 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.