Alert archive / Nevada / Flash Flood Warnings in 2021

Flash Flood Warning 90, NWS Las Vegas, NV

July 31, 2021Lincoln County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2021, 11:11 AM PDT for Lincoln County, Nevada. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 31, 2021, 11:11 AM PDT (18:11 UTC)
Expired: Jul 31, 2021, 2:15 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), 164 km from the middle of the area, began a volume at 18:14 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.

What was reported inside it

Time	Report	Where	Remark
Jul 31, 11:15 AM PDT	FLASH FLOOD	10 W Caliente, NV	US-93 WAS CLOSED NEAR MILE MARKER 81...12 MILES WEST OF CALIENTE FOR A FEW HOURS DUE TO WATER AND MUD ON THE ROADWAY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 6.2 hours before the alert went out and 156 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: 134 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 2161 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

285 
WGUS55 KVEF 311811
FFWVEF
NVC017-312115-
/O.NEW.KVEF.FF.W.0090.210731T1811Z-210731T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1111 AM PDT Sat Jul 31 2021

The National Weather Service in Las Vegas has issued a

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

* Until 215 PM PDT.

* At 1111 AM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain along Highway 93 west of Caliente between mile markers 
  75 and 85. Flash flooding is ongoing or expected to begin shortly.

  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...
  Highway 93 in Southeastern Lincoln County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3768 11482 3767 11462 3767 11461 3748 11462
      3751 11483

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

$$

JS

2 follow-up statements

044 
WGUS75 KVEF 311954
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1254 PM PDT Sat Jul 31 2021

NVC017-312115-
/O.CON.KVEF.FF.W.0090.000000T0000Z-210731T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln NV-
1254 PM PDT Sat Jul 31 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 PM PDT THIS 
AFTERNOON FOR SOUTHEASTERN LINCOLN COUNTY...

At 1254 PM PDT, Doppler radar indicated thunderstorms west of 
Caliente have dissipated. However, due to radar estimated rain 
amounts of 2 to 4 inches falling in the area from earlier 
thunderstorms, the warning is continued.

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 continue to experience flooding impacts 
from the earlier heavy rain include...
  Highway 93 in Southeastern Lincoln County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3768 11482 3767 11462 3767 11461 3748 11462
      3751 11483

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

$$

JS

386 
WGUS75 KVEF 312111
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
211 PM PDT Sat Jul 31 2021

NVC017-312121-
/O.EXP.KVEF.FF.W.0090.000000T0000Z-210731T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln NV-
211 PM PDT Sat Jul 31 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 215 PM PDT THIS AFTERNOON 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.

A Flash Flood Watch remains in effect until 500 AM PDT Sunday for 
portions of northwest Arizona, southeast California and Nevada.

LAT...LON 3768 11482 3767 11462 3767 11461 3748 11462
      3751 11483

$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 1:13 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Jul 31, 2:47 PM PDT	Areal Flood Advisory	VEF	Clark	118 min

Nearby

Flash Flood Warnings in Nevada, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.