Alert archive / Nevada / Flash Flood Warnings in 2011

Flash Flood Warning 26, NWS Las Vegas, NV

July 6, 2011Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 6, 2011, 1:19 PM PDT for Clark County, Nevada. It was in force for 80 min. 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 6, 2011, 1:19 PM PDT (20:19 UTC)
Expired: Jul 6, 2011, 2:39 PM PDT
In force: 80 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Clark County, NV

The radar

The Las Vegas radar (KESX), 92 km from the middle of the area, began a volume at 20:20 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

Las Vegas, NV (KVEF), launched 12:00Z, 8.3 hours before the alert went out and 36 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: 213 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 1843 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -32 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.

336 
WGUS55 KVEF 062019
FFWVEF
NVC003-062315-
/O.NEW.KVEF.FF.W.0026.110706T2019Z-110706T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
119 PM PDT WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 415 PM PDT.

* AT 115 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN FROM THUNDERSTORMS OVER THE WEST SIDE OF THE SPRING 
MOUNTAINS NEAR AND SOUTH OF MOUNT CHARLESTON.  RADAR ESTIMATES TWO 
TO THREE INCHES OF RAINFALL HAS FALLEN SINCE NOON WITH THESE STORMS.

* LOCATIONS IMPACTED INCLUDE...MARY JANE FALLS CAMPGROUND...AND 
HIGHWAY 160 FROM MILE MARKER 26 TO 45.

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3611 11588 3622 11588 3628 11566 3597 11557
      3603 11579

$$

JGG

2 follow-up statements

833 
WGUS75 KVEF 062052
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
152 PM PDT WED JUL 6 2011

NVC003-062315-
/O.CON.KVEF.FF.W.0026.000000T0000Z-110706T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
152 PM PDT WED JUL 6 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR WEST
CENTRAL CLARK COUNTY...

AT 146 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE WESTERN 
SPRING MOUNTAINS.  THE STORMS HAVE BEGUN TO MOVE SLOWLY WESTWARD 
AWAY FROM AREAS THAT ACCORDING TO RADAR ESTIMATES EXPERIENCED UP TO 
THREE INCHES OF RAIN FROM 1245 TO 145 PM...HOWEVER THE THREAT FOR 
FLASH FLOODING REMAINS.

LOCATIONS IMPACTED INCLUDE...MARY JANE FALLS CAMPGROUND.

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 TWITTER #NWSVEGAS.

&&

LAT...LON 3611 11588 3622 11588 3628 11566 3597 11557
      3603 11579

$$

JGG

535 
WGUS75 KVEF 062139
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
239 PM PDT WED JUL 6 2011

NVC003-062149-
/O.CAN.KVEF.FF.W.0026.000000T0000Z-110706T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
239 PM PDT WED JUL 6 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEST CENTRAL CLARK
COUNTY...

HEAVY RAIN IN THE AREA HAS ENDED. WASHES MAY RUN ABOVE NORMAL FOR 
MUCH OF THE AFTERNOON BUT THE THREAT FOR SIGNIFICANT FLASH FLOODING 
APPEARS TO HAVE PASSED. THEREFORE THE WARNING IS CANCELLED.

LAT...LON 3611 11588 3622 11588 3628 11566 3597 11557
      3603 11579

$$

JGG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:45 PM PDT	Areal Flood Advisory	VEF	Clark, Nye	2 hr
Jul 6, 12:04 AM PDT	Severe Thunderstorm Warning	VEF	Clark	41 min
Jul 6, 12:15 AM PDT	Flash Flood Warning	VEF	Clark	2 hr
Jul 6, 4:40 AM PDT	Flash Flood Watch	VEF	Clark, Esmeralda, Lincoln, Nye	17 hr
Jul 6, 10:58 AM PDT	Areal Flood Advisory	VEF	Clark, Nye	66 min
Jul 6, 12:25 PM PDT	Areal Flood Advisory	VEF	Esmeralda, Lincoln, Nye	3 hr
Jul 6, 12:49 PM PDT	Severe Thunderstorm Warning	VEF	Clark	26 min
Jul 6, 1:01 PM PDT	Areal Flood Advisory	VEF	Clark, Nye	21 min
Jul 6, 2:05 PM PDT	Areal Flood Advisory	VEF	Lincoln	3 hr
Jul 6, 3:10 PM PDT	Areal Flood Advisory	VEF	Lincoln	2 hr
Jul 6, 3:26 PM PDT	Areal Flood Advisory	VEF	Esmeralda, Lincoln, Nye	2 hr

Nearby

Flash Flood Warnings in Nevada, 2011 Every flash flood warning in 2011

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.