Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 91, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2021, 12:29 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
- Jul 31, 2021, 12:29 PM MST (19:29 UTC)
- Expired
- Jul 31, 2021, 3:30 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), 90 km from the middle of the area, began a volume at 19:27 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
Las Vegas, NV (KVEF), launched 12:00Z, 7.5 hours before the alert went out and 156 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
- 134 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 2161 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
480
WGUS55 KVEF 311929
FFWVEF
AZC015-312230-
/O.NEW.KVEF.FF.W.0091.210731T1929Z-210731T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1229 PM PDT Sat Jul 31 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Northwestern Mohave County in northwestern Arizona...
* Until 330 PM MST.
* At 1229 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across Diamond Bar Road northeast of Dolan Springs.
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 Bar Road, Grand Canyon Ranch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3590 11401 3596 11389 3585 11377 3579 11392
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JS2 follow-up statements
388
WGUS75 KVEF 312059
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
159 PM PDT Sat Jul 31 2021
AZC015-312230-
/O.CON.KVEF.FF.W.0091.000000T0000Z-210731T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
159 PM MST Sat Jul 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM MST THIS
AFTERNOON FOR NORTHWESTERN MOHAVE COUNTY...
At 159 PM MST, Doppler radar indicated thunderstorms that prompted
the warning have dissipated. However, flooding impacts in the area
including along Diamond Bar Road, may be ongoing. Do not attempt to
cross flooded roads.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that may be experiencing flooding include...
Diamond Bar Road, Grand Canyon Ranch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3590 11401 3596 11389 3585 11377 3579 11392
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JS864 WGUS75 KVEF 312228 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 328 PM PDT Sat Jul 31 2021 AZC015-312238- /O.EXP.KVEF.FF.W.0091.000000T0000Z-210731T2230Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mohave AZ- 328 PM MST Sat Jul 31 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 330 PM MST THIS AFTERNOON FOR NORTHWESTERN MOHAVE COUNTY... The heavy rain has ended and flooding is no longer expected to pose a threat at this time. Please continue to heed remaining road closures. A Flash Flood Watch remains in effect until 500 AM MST Sunday for portions of northwest Arizona, southeast California and Nevada. LAT...LON 3590 11401 3596 11389 3585 11377 3579 11392 $$ JS
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:56 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 31, 4:15 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.