Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 110, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 12, 2021, 5:43 PM 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
- Aug 12, 2021, 5:43 PM MST (00:43 UTC)
- Expired
- Aug 12, 2021, 8:45 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 Cedar City radar (KICX), 114 km from the middle of the area, began a volume at 00:46 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 00:00Z, 0.7 hours before the alert went out and 180 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.
- Mixed-layer CAPE
- 2 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1844 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
655
WGUS55 KVEF 130043
FFWVEF
AZC015-130345-
/O.NEW.KVEF.FF.W.0110.210813T0043Z-210813T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
543 PM PDT Thu Aug 12 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Northeastern Mohave County in northwestern Arizona...
* Until 845 PM MST.
* At 543 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the Mount Trumbull area. Between 0.5 and 1 inch
of rain has fallen. Flash flooding is ongoing or expected to begin
shortly and may impact roads leading to Mt Trumbull and the Mt
Trumbull loop.
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.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3672 11293 3672 11275 3666 11265 3658 11270
3643 11269 3643 11276 3639 11293 3633 11305
3639 11325 3656 11324 3671 11312 3675 11304
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO2 follow-up statements
641
WGUS75 KVEF 130155
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
655 PM PDT Thu Aug 12 2021
AZC015-130345-
/O.CON.KVEF.FF.W.0110.000000T0000Z-210813T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
655 PM MST Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST THIS
EVENING FOR NORTHEASTERN MOHAVE COUNTY...
At 655 PM MST, Moderate rainfall continues around the Mt Trumbull
loop. Regional low water crossings are likely flooded and
impassable, and flash flooding remains likely.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Mt. Trumbull.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3672 11293 3672 11275 3666 11265 3658 11270
3643 11269 3643 11276 3639 11293 3633 11305
3639 11325 3656 11324 3671 11312 3675 11304
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO867
WGUS75 KVEF 130343
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
843 PM PDT Thu Aug 12 2021
AZC015-130353-
/O.EXP.KVEF.FF.W.0110.000000T0000Z-210813T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
843 PM MST Thu Aug 12 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MST THIS EVENING 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.
LAT...LON 3672 11293 3672 11275 3666 11265 3658 11270
3643 11269 3643 11276 3639 11293 3633 11305
3639 11325 3656 11324 3671 11312 3675 11304
$$
COThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 5:24 PM MST | Flash Flood Warning | VEF | Mohave | 111 min |
| Aug 12, 8:17 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 58 min |
| Aug 12, 8:42 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Aug 12, 8:54 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Aug 12, 9:10 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 50 min |
| Aug 12, 10:56 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
Nearby
Flash Flood Warnings in Arizona, 2021Every 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.