Alert archive / Nevada / Flash Flood Warnings in 2021

Flash Flood Warning 108, NWS Las Vegas, NV

August 12, 2021Lincoln County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Aug 12, 2021, 4:38 PM PDT for Lincoln County, Nevada. It was in force for 3 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 12, 2021, 4:38 PM PDT (23:38 UTC)
Expired
Aug 12, 2021, 7:45 PM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

County Lincoln County, NV

The radar

The Cedar City radar (KICX), 151 km from the middle of the area, began a volume at 23:38 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, 11.6 hours before the alert went out and 145 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 12:00Z on 2021-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 533 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2021-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 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
533 J/kg
Mixed-layer CIN
-365 J/kg
Mixed-layer LCL
2225 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

352 
WGUS55 KVEF 122338
FFWVEF
NVC017-130245-
/O.NEW.KVEF.FF.W.0108.210812T2338Z-210813T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
438 PM PDT Thu Aug 12 2021

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  Southeastern Lincoln County in south central Nevada...

* Until 745 PM PDT.

* At 438 PM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain between Caliente and Elgin. Between 0.5 and 1.25 inches 
  of rain have fallen. Flash flooding is ongoing or expected to 
  begin shortly and may impact low water crossings on highway 317 
  along Meadow Valley Wash.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life-threatening flash flooding of low-water
           crossings, creeks, normally dry washes and roads.

* Some locations that will experience flash flooding include...
  Caliente, Kershaw-Ryan Campground and Elgin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3759 11458 3760 11452 3754 11447 3736 11447
      3726 11440 3722 11446 3721 11449 3722 11465
      3731 11470 3754 11475 3758 11470

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CO
2 follow-up statements
693 
WGUS75 KVEF 130057
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
557 PM PDT Thu Aug 12 2021

NVC017-130245-
/O.CON.KVEF.FF.W.0108.000000T0000Z-210813T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln NV-
557 PM PDT Thu Aug 12 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM PDT THIS 
EVENING FOR SOUTHEASTERN LINCOLN COUNTY...

At 557 PM PDT, Areas of heavy rainfall continue, mainly south and 
west of Elgin. Excessive runoff and flash flooding remain possible 
along Meadow Valley Wash and Kane Springs Wash through the early 
evening.

HAZARD...Life-threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life-threatening flash flooding of low-water crossings,
         creeks, normally dry washes and roads.

Some locations that will experience flash flooding include...
  Caliente, Kershaw-Ryan Campground and Elgin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3759 11458 3760 11452 3754 11447 3736 11447
      3726 11440 3722 11446 3721 11449 3722 11465
      3731 11470 3754 11475 3758 11470

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CO
196 
WGUS75 KVEF 130237
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
737 PM PDT Thu Aug 12 2021

NVC017-130247-
/O.EXP.KVEF.FF.W.0108.000000T0000Z-210813T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln NV-
737 PM PDT Thu Aug 12 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 745 PM PDT THIS EVENING FOR 
SOUTHEASTERN LINCOLN COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3759 11458 3760 11452 3754 11447 3736 11447
      3726 11440 3722 11446 3721 11449 3722 11465
      3731 11470 3754 11475 3758 11470

$$

CO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 4:02 PM PDTSevere Thunderstorm WarningVEFLincoln43 min

Nearby

Flash Flood Warnings in Nevada, 2021Every flash flood warning in 2021

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.