Alert archive / Nevada / Flash Flood Warnings in 2007

Flash Flood Warning 39, NWS Las Vegas, NV

August 27, 2007Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 27, 2007, 6:44 AM PDT for Clark County, Nevada. It was in force for 2 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 27, 2007, 6:44 AM PDT (13:44 UTC)
Expired
Aug 27, 2007, 8:45 AM PDT
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Whole counties

County Clark County, NV

The radar

The Las Vegas radar (KESX), 58 km from the middle of the area, began a volume at 13:43 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 27, 8:21 AM PDTFLASH FLOODLas Vegas (Downtown), NVCIMARRON DR BETWEEN DESERT INN AND SAHARA FLOODED AND DEBRIS COVERED. APARTMENT COMPLEX WALL AT EL DORA AND DURANGO WASHED OUT.

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

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 1.7 hours before the alert went out and 99 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, Mercury/Desert R, NV at 12:00Z on 2007-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 85 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, Mercury/Desert R, NV at 12:00Z on 2007-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
85 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
1937 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KVEF 271345
FFWVEF
NVC003-271545-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
644 AM PDT MON AUG 27 2007

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE

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

* UNTIL 845 AM PDT.

* AT 644 AM PDT...LOCAL LAW ENFORCEMENT HAS REPORTED FLASH           
  FLOODING ACROSS PORTIONS OF THE LAS VEGAS VALLEY. THE 
  FLAMINGO WASH IS OUT OF ITS BANKS...PARTICULARLY NEAR KOVAL        
  LANE.    

* LOCATIONS IMPACTED INCLUDE...DOWNTOWN LAS VEGAS...NELLIS 
  AFB...NORTH LAS VEGAS...SAMS TOWN...SPRING VALLEY...STRATOSPHERE 
  TOWER...SUNRISE MTN...THE SILVER BOWL...THE STRIP AND UNLV.

ADDITIONAL HEAVY DOWNPOURS ARE POSSIBLE THROUGHOUT THE 
MORNING. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY. 
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. 
TURN AROUND...DONT DROWN.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. SEVERAL INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN
AROUND...DONT DROWN.

LAT...LON 3606 11534 3596 11515 3627 11478 3646 11510

$$
SC
1 follow-up statement
000
WGUS75 KVEF 271527
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
825 AM PDT MON AUG 27 2007

NVC003-271545-
CLARK NV-
825 AM PDT MON AUG 27 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 AM PDT FOR
CENTRAL CLARK COUNTY...

AT 820 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN 
AREA OF THUNDERSTORMS ACROSS THE SOUTHWEST PORTION OF THE LAS VEGAS 
VALLEY. THESE THUNDERSTORMS MAY AGGRAVATE THOSE AREAS THAT HAVE 
ALREADY EXPERIENCED FLASH FLOODING THIS MORNING. A NATIONAL WEATHER 
SERVICE WEATHER SPOTTER REPORTED FLOODING OCCURRING ON CIMARRON 
BETWEEN DESERT INN AND SAHARA.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE LAS 
VEGAS STRIP...DOWNTOWN LAS VEGAS...NORTH LAS VEGAS AND NELLIS AFB. 

ADDITIONAL RAINFALL AMOUNTS OF ONE QUARTER TO ONE HALF INCH ARE 
POSSIBLE IN THE WARNED AREA OVER THE NEXT HOUR WITH LOCALIZED HIGHER 
AMOUNTS. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. SEVERAL INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.

LAT...LON 3606 11534 3596 11515 3627 11478 3646 11510

$$

SC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 3:12 AM PDTFlash Flood WarningVEFClark93 min
Aug 27, 3:54 AM PDTFlash Flood WarningVEFClark2 hr
Aug 27, 4:40 AM PDTFlash Flood WarningVEFClark2 hr
Aug 27, 8:42 AM PDTFlash Flood WarningVEFClark2 hr

Nearby

Flash Flood Warnings in Nevada, 2007Every flash flood warning in 2007

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.