Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 58, NWS Las Vegas, NV

July 24, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 24, 2021, 3:21 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: Jul 24, 2021, 3:21 PM MST (22:21 UTC)
Expired: Jul 24, 2021, 5:34 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 Cedar City radar (KICX), 126 km from the middle of the area, began a volume at 22:20 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, 10.4 hours before the alert went out and 192 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1053 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

546 
WGUS55 KVEF 242221
FFWVEF
AZC015-250130-
/O.NEW.KVEF.FF.W.0058.210724T2221Z-210725T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
321 PM PDT Sat Jul 24 2021

The National Weather Service in Las Vegas has issued a

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

* Until 630 PM MST.

* At 321 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...
  Mt. Trumbull, Mt. Logan, Bar Ten Ranch, and the Mt Trumbull Loop 
  Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3641 11300 3632 11300 3625 11319 3629 11339
      3650 11346 3676 11362 3682 11350 3662 11324
      3659 11300

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

$$

AN

2 follow-up statements

477 
WGUS75 KVEF 242329
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
429 PM PDT Sat Jul 24 2021

AZC015-250130-
/O.CON.KVEF.FF.W.0058.000000T0000Z-210725T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
429 PM MST Sat Jul 24 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST THIS 
EVENING FOR NORTHEASTERN MOHAVE COUNTY...

At 429 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...
  Mt. Trumbull, Mt. Logan, Bar Ten Ranch, and the Mt. Trumbull Loop 
  Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3641 11300 3632 11300 3625 11319 3629 11339
      3650 11346 3658 11340 3662 11324 3659 11300

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

$$

AN

466 
WGUS75 KVEF 250034
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
534 PM PDT Sat Jul 24 2021

AZC015-250044-
/O.CAN.KVEF.FF.W.0058.000000T0000Z-210725T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
534 PM MST Sat Jul 24 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN MOHAVE 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 1200 AM MST Monday for 
portions of northwest Arizona, southeast California and southern 
Nevada.

LAT...LON 3641 11300 3632 11300 3625 11319 3629 11339
      3650 11346 3658 11340 3662 11324 3659 11300

$$

AN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 5:52 PM MST	Severe Thunderstorm Warning	VEF	Mohave	53 min
Jul 23, 7:11 PM MST	Severe Thunderstorm Warning	VEF	Mohave	49 min
Jul 23, 7:58 PM MST	Severe Thunderstorm Warning	VEF	Mohave	23 min
Jul 23, 9:52 PM MST	Severe Thunderstorm Warning	VEF	Mohave	29 min
Jul 23, 10:18 PM MST	Severe Thunderstorm Warning	VEF	Mohave	42 min
Jul 23, 11:58 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Jul 24, 1:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 24, 1:26 PM MST	Severe Thunderstorm Warning	VEF	Mohave	49 min
Jul 24, 3:18 PM MST	Severe Thunderstorm Warning	VEF	Mohave	57 min

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.