Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 11, NWS Las Vegas, NV

July 13, 2012Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 13, 2012, 5:27 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 13, 2012, 5:27 PM PDT (00:27 UTC)
Expired: Jul 13, 2012, 7:30 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), 27 km from the middle of the area, began a volume at 00:30 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 00:00Z, 0.5 hours before the alert went out and 121 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: 90 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1887 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 104 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.

544 
WGUS55 KVEF 140027
FFWVEF
NVC003-140230-
/O.NEW.KVEF.FF.W.0011.120714T0027Z-120714T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
527 PM PDT FRI JUL 13 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 730 PM PDT.

* AT 522 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR SEARCHLIGHT...MOVING   
  SOUTHEAST AT 10 MPH. RAINFALL AMOUNTS UP TO ONE AND A HALF INCHES
  CAN BE EXPECTED IN LESS THAN AN HOUR.

* LOCATIONS IMPACTED INCLUDE...
  SEARCHLIGHT...NEARBY SECTIONS OF HIGHWAY 95...AND COTTONWOOD 
  COVE.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3559 11470 3535 11465 3519 11471 3540 11512
      3566 11497

$$

JA

2 follow-up statements

089 
WGUS75 KVEF 140130
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
630 PM PDT FRI JUL 13 2012

NVC003-140230-
/O.CON.KVEF.FF.W.0011.000000T0000Z-120714T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
630 PM PDT FRI JUL 13 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM PDT FOR SOUTH
CENTRAL CLARK COUNTY...

AT 622 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN. THE CELL 
PRODUCING THE HEAVIEST RAIN IS LOCATED JUST SOUTH OF CALNEVARI AND 
IS SLOWLY DRIFTING TO THE SOUTHEAST. 

LOCATIONS IMPACTED INCLUDE...
SEARCHLIGHT...CALNEVARI...HIGHWAY 95 BETWEEN SEARCHLIGHT AND THE 
NEVADA AND CALIFORNIA STATE LINE...COTTONWOOD COVE CAMPGROUND AND 
COTTONWOOD COVE.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3559 11470 3535 11465 3519 11471 3540 11512
      3566 11497

$$

JS

914 
WGUS75 KVEF 140227
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
727 PM PDT FRI JUL 13 2012

NVC003-140232-
/O.EXP.KVEF.FF.W.0011.000000T0000Z-120714T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
727 PM PDT FRI JUL 13 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 730 PM PDT FOR SOUTH
CENTRAL CLARK COUNTY...

THUNDERSTORMS THAT PRODUCED THE EARLIER HEAVY RAIN HAVE WEAKENED AND 
FLASH FLOODING IS NO LONGER EXPECTED IN THE WARNED AREA FROM THESE 
STORMS. HOWEVER...RUNOFF IN AREA WASHES MAY CONTINUE TO AFFECT LOW 
LYING AREAS AND MOTORISTS SHOULD REMAIN AWARE OF POSSIBLE SLICK ROAD 
CONDITIONS.

LAT...LON 3559 11470 3535 11465 3519 11471 3540 11512
      3566 11497

$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 2:24 AM PDT	Areal Flood Advisory	VEF	Clark	48 min
Jul 14, 3:05 AM PDT	Areal Flood Advisory	VEF	Clark	44 min
Jul 14, 4:38 PM PDT	Flash Flood Warning	VEF	Clark	3 hr

Nearby

Flash Flood Warnings in Nevada, 2012 Every flash flood warning in 2012

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.