Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 143, NWS Las Vegas, NV

August 21, 2012Lincoln County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 21, 2012, 6:47 PM PDT for Lincoln County, Nevada. It was in force for 118 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
Aug 21, 2012, 6:47 PM PDT (01:47 UTC)
Expired
Aug 21, 2012, 8:45 PM PDT
In force
118 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Lincoln County, NV

The radar

The Cedar City radar (KICX), 115 km from the middle of the area, began a volume at 01:50 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, 1.8 hours before the alert went out and 187 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 00:00Z on 2012-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2012-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3181 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

448 
WGUS55 KVEF 220147
FFWVEF
NVC017-220345-
/O.NEW.KVEF.FF.W.0143.120822T0147Z-120822T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
647 PM PDT TUE AUG 21 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL LINCOLN COUNTY IN SOUTH CENTRAL NEVADA...

* UNTIL 845 PM PDT.

* AT 641 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 11 MILES NORTH OF BEAVER DAM
  STATE PARK...OR 21 MILES EAST OF CALIENTE. THE STORM PRODUCING VERY
  HEAVY RAIN WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  THE ROAD LEADING TO BEAVER DAM...CRESTLINE ROAD AND MAINLY RURAL   
  AREAS OF EASTERN LINCOLN COUNTY.

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 3773 11425 3773 11413 3772 11406 3746 11406
      3753 11426

$$

JS
2 follow-up statements
154 
WGUS75 KVEF 220304
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
804 PM PDT TUE AUG 21 2012

NVC017-220345-
/O.CON.KVEF.FF.W.0143.000000T0000Z-120822T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINCOLN NV-
804 PM PDT TUE AUG 21 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM PDT FOR EAST
CENTRAL LINCOLN COUNTY...

AT 750 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING MODERATE TO HEAVY RAIN 10 MILES 
NORTH OF BEAVER DAM SOUTH OF HIGH 319. LAS VEGAS AND CEDAR CITY 
RADARS ARE ESTIMATING THAT GREATER THAN 3 INCHES OF RAIN HAS FALLEN 
OVER THE AREA FROM THESE STORMS IN THE PAST 2 HOURS. PRIMARY 
IMPACTED AREAS INCLUDE CRESTLINE ROAD...THE SECONDARY ROAD LEADING 
TO BEAVER DAM AND MAINLY RURAL AREAS OF EXTREME EASTERN LINCOLN 
COUNTY. MOTORISTS HEADING TO BEAVER DAM FROM HIGHWAY 93 SHOULD USE 
EXTREME CAUTION AND BE ALERT FOR WATER CROSSING THE ROADWAY AND 
AREAS THAT MAY BE COMPLETELY WASHED OUT.

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 3773 11425 3773 11413 3772 11406 3746 11406
      3753 11426

$$

JS
474 
WGUS75 KVEF 220343
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
843 PM PDT TUE AUG 21 2012

NVC017-220347-
/O.EXP.KVEF.FF.W.0143.000000T0000Z-120822T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINCOLN NV-
843 PM PDT TUE AUG 21 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM PDT FOR EAST CENTRAL
LINCOLN COUNTY...

THUNDERSTORMS HAVE WEAKENED OVER EAST CENTRAL LINCOLN COUNTY AND THE 
WARNING WILL BE ALLOWED TO EXPIRE ON TIME. ELEVATED WATER LEVELS ARE 
EXPECTED IN AREA WASHES DUE TO RUNOFF FROM THE EARLIER HEAVY RAIN. 
ROAD CONDITIONS INTO BEAVER DAM FROM HIGHWAY 93 ARE UNKNOWN AND 
ANYONE TRAVELING TO BEAVER DAM ALONG THIS ROUTE SHOULD BE ALERT FOR 
STANDING WATER ON THE ROADWAY AND ALSO AREAS WHERE THE ROAD MAY BE 
PARTIALLY OR COMPLETELY WASHED OUT.

LAT...LON 3773 11425 3773 11413 3772 11406 3746 11406
      3753 11426

$$

JS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 6:10 PM PDTFlash Flood WarningVEFClark, Lincoln2 hr
Aug 22, 12:12 AM PDTFlash Flood WarningVEFClark2 hr
Aug 22, 2:35 AM PDTFlash Flood WarningVEFClark115 min
Aug 22, 8:22 AM PDTAreal Flood AdvisoryVEFClark9 hr
Aug 22, 9:19 AM PDTAreal Flood AdvisoryVEFClark, Lincoln, Nye3 hr
Aug 22, 9:20 AM PDTFlash Flood WarningVEFClark101 min
Aug 22, 9:34 AM PDTFlash Flood WarningVEFClark116 min
Aug 22, 9:59 AM PDTFlash Flood WarningVEFClark59 min
Aug 22, 10:05 AM PDTFlash Flood WarningVEFEsmeralda76 min
Aug 22, 10:53 AM PDTFlash Flood WarningVEFClark4 hr
Aug 22, 12:12 PM PDTFlash Flood WarningVEFClark4 hr
Aug 22, 12:33 PM PDTFlash Flood WarningVEFClark117 min
Aug 22, 2:40 PM PDTAreal Flood AdvisoryVEFClark6 hr
Aug 22, 3:43 PM PDTFlash Flood WarningVEFClark2 hr

Nearby

Flash Flood Warnings in Nevada, 2012Every 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.