Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS Las Vegas, NV

July 14, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 14, 2021, 11:42 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 14, 2021, 11:42 PM MST (06:42 UTC)
Expired: Jul 15, 2021, 2:45 AM 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 nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 6.7 hours before the alert went out and 143 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: 523 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 2860 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

970 
WGUS55 KVEF 150642
FFWVEF
AZC015-150945-
/O.NEW.KVEF.FF.W.0011.210715T0642Z-210715T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1142 PM PDT Wed Jul 14 2021

The National Weather Service in Las Vegas has issued a

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

* Until 245 AM MST.

* At 1142 PM MST, Gauge reports indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1 inch of rain 
  has fallen. Additional rainfall amounts of 0.25 to 0.75 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly across Buck and Doe Road, Pierce Ferry Road, and 
  Stockton Hill Road.

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

  SOURCE...Gauges reported.

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

* Some locations that will experience flash flooding include...
  Grand Canyon Ranch, Meadview, Pierce Ferry And Antares Roads and 
  Grand Canyon Skywalk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3601 11416 3609 11409 3611 11404 3602 11380
      3583 11384 3572 11392 3567 11406 3569 11425
      3575 11422 3587 11422

FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JV

3 follow-up statements

716 
WGUS75 KVEF 150838
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
138 AM PDT Thu Jul 15 2021

AZC015-150945-
/O.CON.KVEF.FF.W.0011.000000T0000Z-210715T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
138 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM MST EARLY THIS 
MORNING FOR CENTRAL MOHAVE COUNTY...

At 138 AM MST, Gauge reports indicated thunderstorms producing heavy 
rain across the warned area. Between 0.5 and 1 inch of rain has 
fallen. Flash flooding is ongoing.

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

SOURCE...Gauges reported.

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

Some locations that will experience flash flooding include...
  Grand Canyon Ranch, Meadview, Pierce Ferry And Antares Roads and 
  Grand Canyon Skywalk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3601 11416 3609 11409 3611 11404 3602 11380
      3583 11384 3572 11392 3567 11406 3569 11425
      3575 11422 3587 11422

FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JV

624 
WGUS75 KVEF 150908
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
208 AM PDT Thu Jul 15 2021

AZC015-150945-
/O.CON.KVEF.FF.W.0011.000000T0000Z-210715T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
208 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM MST EARLY THIS 
MORNING FOR CENTRAL MOHAVE COUNTY...

At 208 AM MST, Rainfall has ceased over the warned area, but flash 
flooding remains a thread. Continue to heed road closures, if 
applicable.

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

SOURCE...Gauges reported.

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

Some locations that will experience flash flooding include...
  Grand Canyon Ranch, Meadview, Pierce Ferry And Antares Roads and 
  Grand Canyon Skywalk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3601 11416 3609 11409 3611 11404 3602 11380
      3583 11384 3572 11392 3567 11406 3569 11425
      3575 11422 3587 11422

FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JV

966 
WGUS75 KVEF 150939
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
239 AM PDT Thu Jul 15 2021

AZC015-150949-
/O.EXP.KVEF.FF.W.0011.000000T0000Z-210715T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
239 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 245 AM MST EARLY THIS MORNING 
FOR CENTRAL MOHAVE COUNTY...

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

LAT...LON 3601 11416 3609 11409 3611 11404 3602 11380
      3583 11384 3572 11392 3567 11406 3569 11425
      3575 11422 3587 11422

$$

JV

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:19 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 15, 12:03 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 15, 1:01 AM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	4 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.