Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 105, NWS Las Vegas, NV

August 10, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 10, 2021, 4:59 PM MST for Mohave County, Arizona. It was in force for 3 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 10, 2021, 4:59 PM MST (23:59 UTC)
Expired: Aug 10, 2021, 8:00 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), 183 km from the middle of the area, began a volume at 00:02 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.

What was reported inside it

Time	Report	Where	Remark
Aug 10, 5:30 PM MST	FLASH FLOOD	14 Nne Wikieup, AZ	BOGELES RANCH RD CLOSED FROM UPPER TROUT CREEK RD DUE TO FLOODING.
Aug 10, 5:32 PM MST	FLASH FLOOD	10 N Wikieup, AZ	HUFFRITTER CLOSED FROM US 93 TO BACK ROAD DUE TO FLOODING.
Aug 10, 5:32 PM MST	FLASH FLOOD	3 N Wikieup, AZ	PUMP STATION RD CLOSED FROM US 93 TO BACK ROAD DUE TO FLOODING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 12.0 hours before the alert went out and 189 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: 110 J/kg
Mixed-layer CIN: -193 J/kg
Mixed-layer LCL: 1490 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

007 
WGUS55 KVEF 102359
FFWVEF
AZC015-110300-
/O.NEW.KVEF.FF.W.0105.210810T2359Z-210811T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Las Vegas has issued a

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

* Until 800 PM MST.

* At 459 PM MST, Doppler radar indicated a line of strong 
  thunderstorms producing very heavy rain. Flooding is expected 
  along Highway 93 south of Interstate 40. 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...
  Wikieup, Alamo Lake and Burro Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3422 11383 3483 11374 3510 11371 3516 11333
      3432 11333 3429 11337 3431 11353 3423 11360
      3421 11366 3421 11370 3424 11373 3423 11378
      3423 11382

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

$$

SC

2 follow-up statements

584 
WGUS75 KVEF 110028
FFSVEF

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

AZC015-110300-
/O.CON.KVEF.FF.W.0105.000000T0000Z-210811T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
528 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING 
FOR SOUTH CENTRAL MOHAVE COUNTY...

At 528 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain along much of Highway 93 south of Interstate 40 to the Yavapai 
County Line. The heaviest rainfall has been between mile markers 107 
and 114 where radar is estimating between 1.5 and 2.5 inches of rain 
in the past hour ending at 525 PM MST.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...
  Wikieup, Alamo Lake and Burro Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3422 11383 3483 11374 3510 11371 3516 11333
      3432 11333 3429 11337 3431 11353 3423 11360
      3421 11366 3421 11370 3424 11373 3423 11378
      3423 11382

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

$$

SC

610 
WGUS75 KVEF 110253
FFSVEF

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

AZC015-110303-
/O.EXP.KVEF.FF.W.0105.000000T0000Z-210811T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
753 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 8 PM MST THIS EVENING FOR 
SOUTH CENTRAL MOHAVE COUNTY...

The heavy rain has ended over south central Mohave County. Flooding 
is no longer expected to pose a threat. However, several roadways 
along Highway 93 north of Wikieup have been closed due to the 
earlier flooding. Please continue to heed remaining road closures.

LAT...LON 3422 11383 3483 11374 3510 11371 3516 11333
      3432 11333 3429 11337 3431 11353 3423 11360
      3421 11366 3421 11370 3424 11373 3423 11378
      3423 11382

$$

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, 1:22 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 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

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.