Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 17, 2021, 4:40 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 17, 2021, 4:40 PM MST (23:40 UTC)
- Expired
- Jul 17, 2021, 7:45 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 Las Vegas radar (KESX), 76 km from the middle of the area, began a volume at 23:42 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, 11.7 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3507 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
474
WGUS55 KVEF 172340
FFWVEF
AZC015-180245-
/O.NEW.KVEF.FF.W.0018.210717T2340Z-210718T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
440 PM PDT Sat Jul 17 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
West Central Mohave County in northwestern Arizona...
* Until 745 PM MST.
* At 440 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across portions of Pierce Ferry Rd, Diamond Bar Rd, and
Stockton Hill Rd. 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...
Pierce Ferry And Antares Roads and Dolan Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3572 11387 3564 11386 3560 11393 3550 11396
3542 11403 3543 11411 3548 11420 3576 11429
3601 11431 3602 11415 3591 11407
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CP2 follow-up statements
438
WGUS75 KVEF 180154
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
654 PM PDT Sat Jul 17 2021
AZC015-180245-
/O.CON.KVEF.FF.W.0018.000000T0000Z-210718T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
654 PM MST Sat Jul 17 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MST THIS
EVENING FOR WEST CENTRAL MOHAVE COUNTY...
At 654 PM MST, the thunderstorms that produced heavy rainfall have
moved out of the area. However, radar indicated several areas saw
over an inch of rainfall leading to potential flash flooding along
flood-prone roadways. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Pierce Ferry, Antares Roads and Diamond Bar Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3572 11387 3564 11386 3560 11393 3550 11396
3542 11403 3543 11411 3548 11420 3576 11429
3601 11431 3602 11415 3591 11407
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CP831
WGUS75 KVEF 180245
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
745 PM PDT Sat Jul 17 2021
AZC015-180255-
/O.EXP.KVEF.FF.W.0018.000000T0000Z-210718T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-
745 PM MST Sat Jul 17 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR WEST CENTRAL 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 3572 11387 3564 11386 3560 11393 3550 11396
3542 11403 3543 11411 3548 11420 3576 11429
3601 11431 3602 11415 3591 11407
$$
CPThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 1:32 PM MST | Flash Flood Warning | VEF | Mohave | 108 min |
| Jul 17, 2:08 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 17, 3:53 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.