Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 89, NWS Las Vegas, NV

August 1, 2012Lincoln County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 1, 2012, 6:18 PM PDT for Lincoln 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: Aug 1, 2012, 6:18 PM PDT (01:18 UTC)
Expired: Aug 1, 2012, 8:20 PM PDT
In force: 2 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Lincoln County, NV

The radar

The Cedar City radar (KICX), 125 km from the middle of the area, began a volume at 01:20 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 00:00Z, 1.3 hours before the alert went out and 200 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: 349 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 2152 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 44 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.

325 
WGUS55 KVEF 020118
FFWVEF
NVC017-020515-
/O.NEW.KVEF.FF.W.0089.120802T0118Z-120802T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
618 PM PDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1015 PM PDT/1115 PM MDT/.

* AT 609 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM A LINE OF THUNDERSTORMS MOVING SOUTHWEST      
  ACROSS LINCOLN COUNTY AT 20 TO 30 MPH. RAINFALL TOTALS IN EXCESS   
  OF ONE INCH WERE ESTIMATED BY RADAR IN SOME AREAS NEAR BEAVER DAM. 
  IN ADDITION...HEAVY RAIN HAD FALLEN IN PORTIONS OF EAGLE VALLEY    
  WHICH MAY CAUSE RISES IN PORTIONS OF THE MEADOW VALLEY WASH.

* LOCATIONS IMPACTED INCLUDE...
  MEADOW VALLEY CAMPGROUND...HORSETHIEF GULCH CAMPGROUND...EAGLE
  VALLEY AND RANCH 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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3830 11405 3721 11405 3720 11453 3823 11454

$$

STACHELSKI

1 follow-up statement

938 
WGUS75 KVEF 020320
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
820 PM PDT WED AUG 1 2012

NVC017-020327-
/O.CAN.KVEF.FF.W.0089.000000T0000Z-120802T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINCOLN NV-
820 PM PDT WED AUG 1 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN LINCOLN
COUNTY...

THUNDERSTORMS IN THE WARNING AREA HAVE DISSIPATED AND FLASH FLOODING 
IS NO LONGER EXPECTED. HOWEVER...WATER LEVELS MAY STILL REMAIN 
ELEVATED IN AREA WASHES FROM THE EARLIER HEAVY RAIN AND PONDING OF 
WATER ON LOW LYING ROADWAY CROSSING IS POSSIBLE THROUGH 10 PM. 

LAT...LON 3830 11405 3721 11405 3720 11453 3823 11454

$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 2:42 PM PDT	Areal Flood Advisory	VEF	Nye	87 min

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.