Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 12, NWS Las Vegas, NV

July 15, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 15, 2021, 12:03 AM 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 15, 2021, 12:03 AM MST (07:03 UTC)
Expired: Jul 15, 2021, 3:15 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 7.1 hours before the alert went out and 165 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: 22 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 1650 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

127 
WGUS55 KVEF 150703
FFWVEF
AZC015-151015-
/O.NEW.KVEF.FF.W.0012.210715T0703Z-210715T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1203 AM PDT Thu Jul 15 2021

The National Weather Service in Las Vegas has issued a

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

* Until 315 AM MST.

* At 1203 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1 inch of rain 
  has fallen. Flash flooding is ongoing or expected to begin shortly 
  in areas including Peach Springs, Valentine, Historic Route 66 and 
  Buck and Doe Road.

  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...
  Valentine, Diamond Creek Campground, Grand Canyon Skywalk and 
  Peach Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3541 11333 3528 11388 3565 11415 3573 11392
      3602 11384 3600 11334 3598 11334 3597 11332
      3596 11332 3595 11333 3592 11333 3589 11331
      3586 11331 3584 11333 3582 11333

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

$$

JV

3 follow-up statements

976 
WGUS75 KVEF 150840
FFSVEF

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

AZC015-151015-
/O.CON.KVEF.FF.W.0012.000000T0000Z-210715T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
140 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM MST EARLY THIS 
MORNING FOR CENTRAL MOHAVE COUNTY...

At 140 AM MST, Satellite indicated thunderstorms producing heavy 
rain across the warned area. Between 0.5 and 1 inch of rain has 
fallen. Flash flooding is ongoing. Peach Springs along Historic 
Route 66 has measured over a half inch of rainfall.

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

SOURCE...Satellite and observations.

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

Some locations that will experience flash flooding include...
  Valentine, Diamond Creek Campground, Grand Canyon Skywalk and 
  Peach Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3541 11333 3528 11388 3565 11415 3573 11392
      3602 11384 3600 11334 3598 11334 3597 11332
      3596 11332 3595 11333 3592 11333 3589 11331
      3586 11331 3584 11333 3582 11333

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

$$

JV

613 
WGUS75 KVEF 150911
FFSVEF

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

AZC015-151015-
/O.CON.KVEF.FF.W.0012.000000T0000Z-210715T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
211 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM MST EARLY THIS 
MORNING FOR CENTRAL MOHAVE COUNTY...

At 211 AM MST, Rainfall has largely ceased over the warned area, 
though additional rainfall is likely around a quarter of an inch. 
Flash flooding remains a threat, so continue to heed road closures, 
if applicable.

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

SOURCE...Satellite and observations.

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

Some locations that will experience flash flooding include...
  Valentine, Diamond Creek Campground, Grand Canyon Skywalk and 
  Peach Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flash flooding is hard to see at night. Be extra cautious if driving 
tonight and turn around, don't drown.

&&

LAT...LON 3541 11333 3528 11388 3565 11415 3573 11392
      3602 11384 3600 11334 3598 11334 3597 11332
      3596 11332 3595 11333 3592 11333 3589 11331
      3586 11331 3584 11333 3582 11333

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

$$

JV

896 
WGUS75 KVEF 151011
FFSVEF

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

AZC015-151021-
/O.EXP.KVEF.FF.W.0012.000000T0000Z-210715T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
311 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 315 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 3541 11333 3528 11388 3565 11415 3573 11392
      3602 11384 3600 11334 3598 11334 3597 11332
      3596 11332 3595 11333 3592 11333 3589 11331
      3586 11331 3584 11333 3582 11333

$$

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 14, 11:42 PM 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.