Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 83, NWS Las Vegas, NV

July 30, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 30, 2021, 12:36 PM MST for Mohave County, Arizona. 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: Jul 30, 2021, 12:36 PM MST (19:36 UTC)
Expired: Jul 30, 2021, 3:45 PM MST
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 88 km from the middle of the area, began a volume at 19:41 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, 7.6 hours before the alert went out and 172 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: 17 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 2114 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: -15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

066 
WGUS55 KVEF 301936
FFWVEF
AZC015-302245-
/O.NEW.KVEF.FF.W.0083.210730T1936Z-210730T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1236 PM PDT Fri Jul 30 2021

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  Central Mohave County in northwestern Arizona...

* Until 345 PM MST.

* At 1236 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 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...
  Vock Canyon, Windy Point Campground, Packsaddle Campground, New 
  Kingman-Butler, Dolan Springs and Pierce Ferry And Antares Roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3540 11377 3524 11395 3548 11422 3578 11413
      3572 11387 3571 11387

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

$$

DB

3 follow-up statements

224 
WGUS75 KVEF 302017
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
117 PM PDT Fri Jul 30 2021

AZC015-302245-
/O.CON.KVEF.FF.W.0083.000000T0000Z-210730T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
117 PM MST Fri Jul 30 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST THIS 
AFTERNOON FOR CENTRAL MOHAVE COUNTY...

At 117 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. 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...
  Windy Point Campground, Packsaddle Campground, New Kingman-Butler, 
  Dolan Springs and Pierce Ferry And Antares Roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3540 11377 3524 11395 3548 11422 3578 11413
      3572 11387 3571 11387

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

$$

DB

790 
WGUS75 KVEF 302112
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
212 PM PDT Fri Jul 30 2021

AZC015-302245-
/O.CON.KVEF.FF.W.0083.000000T0000Z-210730T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
212 PM MST Fri Jul 30 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST THIS 
AFTERNOON FOR CENTRAL MOHAVE COUNTY...

At 212 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. 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...
  Windy Point Campground, Packsaddle Campground, New Kingman-Butler, 
  Dolan Springs and Pierce Ferry And Antares Roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3540 11377 3524 11395 3548 11422 3578 11413
      3572 11387 3571 11387

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

$$

DB

366 
WGUS75 KVEF 302236
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
336 PM PDT Fri Jul 30 2021

AZC015-302246-
/O.EXP.KVEF.FF.W.0083.000000T0000Z-210730T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
336 PM MST Fri Jul 30 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MST THIS AFTERNOON FOR 
CENTRAL MOHAVE COUNTY...

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 MST Sunday for 
portions of northwest Arizona, southeast California and Nevada.

LAT...LON 3540 11377 3524 11395 3548 11422 3578 11413
      3572 11387 3571 11387

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:12 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Jul 29, 6:04 PM MST	Severe Thunderstorm Warning	VEF	Mohave	56 min
Jul 30, 12:04 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 30, 1:14 PM MST	Severe Thunderstorm Warning	VEF	Mohave	61 min
Jul 30, 2:22 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 30, 4:17 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr

Nearby

Flash Flood Warnings in Arizona, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.