Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 94, NWS Las Vegas, NV

August 2, 2012Nye County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 2, 2012, 5:46 PM PDT for Nye County, Nevada. It was in force for 71 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 2, 2012, 5:46 PM PDT (00:46 UTC)
Expired: Aug 2, 2012, 6:57 PM PDT
In force: 71 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Nye County, NV

The radar

The Las Vegas radar (KESX), 125 km from the middle of the area, began a volume at 00:49 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, 0.8 hours before the alert went out and 42 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: 2 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 3766 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

416 
WGUS55 KVEF 030046
FFWVEF
NVC023-030245-
/O.NEW.KVEF.FF.W.0094.120803T0046Z-120803T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
546 PM PDT THU AUG 2 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTH CENTRAL NYE COUNTY IN SOUTH CENTRAL NEVADA...

* UNTIL 745 PM PDT.

* AT 540 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR KOA PAHRUMP...OR 12 MILES
  NORTH OF PAHRUMP. THE STORM PRODUCING VERY HEAVY RAIN WAS NEARLY   
  STATIONARY. RADAR ESTIMATES IN EXCESS OF AN INCH OF RAIN HAVE BEEN 
  SHOW WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...

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 3642 11608 3647 11590 3626 11591 3626 11607

$$

STACHELSKI

1 follow-up statement

230 
WGUS75 KVEF 030157
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
657 PM PDT THU AUG 2 2012

NVC023-030203-
/O.CAN.KVEF.FF.W.0094.000000T0000Z-120803T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NYE NV-
657 PM PDT THU AUG 2 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME SOUTH
CENTRAL NYE COUNTY...

THE THUNDERSTORM THAT PROMPTED THE FLASH FLOOD WARNING FOR PORTIONS 
OF STATE ROUTE 160 BETWEEN MILE MARKERS 11 AND 24 NORTH OF PAHRUMP 
HAS WEAKENED....AND ALTHOUGH RUNOFF MAY OCCUR THROUGH 730 PM...THE 
THREAT OF FLASH FLOODING HAS ENDED. IF THERE IS STILL ANY RUNOFF 
MAKING IT TO ROUTE 160...IT WILL BE NEAR MILE MARKER 18...SO ANY 
TRAVELERS OUT AND ABOUT IN THIS AREA ARE ADVISED TO USE EXTRA 
CAUTION.

LAT...LON 3642 11608 3647 11590 3626 11591 3626 11607

$$

KENNEDY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 3:13 PM PDT	Areal Flood Advisory	VEF	Lincoln	2 hr
Aug 3, 3:37 PM PDT	Areal Flood Advisory	VEF	Nye	113 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.