Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 130, NWS Las Vegas, NV

September 1, 2021Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 1, 2021, 10:15 AM MST for Mohave County, Arizona. It was in force for 116 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 1, 2021, 10:15 AM MST (17:15 UTC)
Expired: Sep 1, 2021, 12:11 PM MST
In force: 116 min
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), 133 km from the middle of the area, began a volume at 17:20 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, 5.3 hours before the alert went out and 154 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: 611 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

062 
WGUS55 KVEF 011715
FFWVEF
AZC015-012015-
/O.NEW.KVEF.FF.W.0130.210901T1715Z-210901T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1015 AM PDT Wed Sep 1 2021

The National Weather Service in Las Vegas has issued a

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

* Until 115 PM MST.

* At 1015 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain on Diamond Creek Road. 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...
  Diamond Creek Campground and Diamond Creek Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3557 11348 3565 11346 3578 11338 3577 11335
      3566 11341 3560 11340

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

$$

CM

2 follow-up statements

628 
WGUS75 KVEF 011758
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1058 AM PDT Wed Sep 1 2021

AZC015-012015-
/O.CON.KVEF.FF.W.0130.000000T0000Z-210901T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
1058 AM MST Wed Sep 1 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM MST THIS 
AFTERNOON FOR CENTRAL MOHAVE COUNTY...

At 1058 AM MST, Doppler radar indicated that heavy rain had moved 
off of Diamond Creek Road. A half inch to an inch of rain fell in 
both Lost Man Creek and the Peach Springs Wash, and this water may 
still be flowing over Diamond Creek 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...
  Diamond Creek Campground and Diamond Creek Road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3557 11348 3565 11346 3578 11338 3577 11335
      3566 11341 3560 11340

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

$$

CM

475 
WGUS75 KVEF 011911
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1211 PM PDT Wed Sep 1 2021

AZC015-011921-
/O.CAN.KVEF.FF.W.0130.000000T0000Z-210901T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
1211 PM MST Wed Sep 1 2021

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

Heavy rain has ended in the Diamond Creek Road area, and flooding is 
no longer expected to pose a threat. Please continue to heed 
remaining road closures.

A Flash Flood Watch remains in effect until 500 AM MST Thursday for 
portions of northwest Arizona, southeast California and southern 
Nevada.

LAT...LON 3557 11348 3565 11346 3578 11338 3577 11335
      3566 11341 3560 11340

$$

CM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 7:11 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 31, 7:58 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Aug 31, 9:38 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Sep 1, 1:08 AM MST	Areal Flood Advisory	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.