Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 99, NWS Las Vegas, NV

August 10, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 10, 2021, 1:22 PM MST for Mohave County, Arizona. It was in force for 2 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 10, 2021, 1:22 PM MST (20:22 UTC)
Expired: Aug 10, 2021, 3:33 PM MST
In force: 2 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), 117 km from the middle of the area, began a volume at 20:27 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.4 hours before the alert went out and 168 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: 609 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

826 
WGUS55 KVEF 102022
FFWVEF
AZC015-102315-
/O.NEW.KVEF.FF.W.0099.210810T2022Z-210810T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
122 PM PDT Tue Aug 10 2021

The National Weather Service in Las Vegas has issued a

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

* Until 415 PM MST.

* At 122 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain along Buck and Doe Road and Highway 66 between Peach 
  Springs and Valentine. 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...
  Valentine and Truxton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3575 11357 3565 11345 3547 11344 3535 11366
      3549 11377 3561 11375

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

$$

SC

2 follow-up statements

029 
WGUS75 KVEF 102124
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
224 PM PDT Tue Aug 10 2021

AZC015-102315-
/O.CON.KVEF.FF.W.0099.000000T0000Z-210810T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
224 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST THIS 
AFTERNOON FOR CENTRAL MOHAVE COUNTY...

At 224 PM MST, Thunderstorms along Buck and Doe Road and Highway 66 
between Peach Springs and Valentine have diminished. However, 
between 0.5 and 1.5 inches of rain have fallen and flash flooding is 
likely ongoing due to the earlier heavy rain.

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 and Peach Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3575 11357 3565 11345 3547 11344 3535 11366
      3549 11377 3561 11375

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

$$

SC

227 
WGUS75 KVEF 102233
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
333 PM PDT Tue Aug 10 2021

AZC015-102243-
/O.CAN.KVEF.FF.W.0099.000000T0000Z-210810T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
333 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL MOHAVE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat along Route 66. Please continue to heed remaining road 
closures.

LAT...LON 3575 11357 3565 11345 3547 11344 3535 11366
      3549 11377 3561 11375

$$

SC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 12:30 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 1:35 PM MST	Severe Thunderstorm Warning	VEF	Mohave	40 min
Aug 10, 2:05 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 2:06 PM MST	Dust Storm Warning	VEF	Mohave	54 min
Aug 10, 2:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 2:50 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 3:25 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 3:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 10, 4:59 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.