Alert archive / Nevada / Flash Flood Warnings in 2008

Flash Flood Warning 21, NWS Las Vegas, NV

July 14, 2008Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 14, 2008, 12:15 PM PDT for Clark County, Nevada. It was in force for 2 hr. 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 14, 2008, 12:15 PM PDT (19:15 UTC)
Expired: Jul 14, 2008, 2:15 PM PDT
In force: 2 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), 106 km from the middle of the area, began a volume at 19:16 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

Mercury/Desert R, NV (KDRA), launched 12:00Z, 7.3 hours before the alert went out and 72 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: -191 J/kg
Mixed-layer LCL: 2011 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 9 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.

000 
WGUS55 KVEF 141917
FFWVEF
NVC003-142115-
/O.NEW.KVEF.FF.W.0021.080714T1915Z-080714T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1215 PM PDT MON JUL 14 2008

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 215 PM PDT.

* AT 1212 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM OVER SHEEP RANGE 
  NEAR HAYFORD PEAK. RADAR ESTIMATES ARE IN EXCESS OF 2 INCHES
  OF RAINFALL.

* LOCATIONS IMPACTED INCLUDE...HAYFORD PK...AND MORMON WELL ROAD.

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR WASHES WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
WASHES.

LAT...LON 3660 11532 3677 11518 3669 11501 3647 11515

$$

SC

1 follow-up statement

000
WGUS75 KVEF 142008
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
105 PM PDT MON JUL 14 2008

NVC003-142115-
/O.CON.KVEF.FF.W.0021.000000T0000Z-080714T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
105 PM PDT MON JUL 14 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 PM PDT FOR NORTH
CENTRAL CLARK COUNTY...

AT 1258 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING HEAVY RAIN OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HAYFORD 
PK...MORMON WELL ROAD AND ALAMO ROAD. NATIONAL WEATHER SERVICE RADAR 
IS ESTIMATING TWO TO THREE INCHES OF RAINFALL HAS FALLEN OVER THE 
WARNED AREA. 

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

LAT...LON 3660 11532 3677 11518 3669 11501 3647 11515

$$

SC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 12:38 PM PDT	Areal Flood Advisory	VEF	Clark	2 hr
Jul 14, 1:49 PM PDT	Areal Flood Advisory	VEF	Clark	54 min
Jul 14, 2:11 PM PDT	Areal Flood Advisory	VEF	Clark, Nye	54 min
Jul 14, 2:21 PM PDT	Flash Flood Warning	VEF	Clark	114 min

Nearby

Flash Flood Warnings in Nevada, 2008 Every flash flood warning in 2008

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.