Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 23, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 18, 2021, 3:46 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 2 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 18, 2021, 3:46 PM MST (22:46 UTC)
- Expired
- Jul 18, 2021, 6:00 PM MST
- In force
- 2 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Mohave County, AZ, Clark County, NV
The radar
The Las Vegas radar (KESX), 128 km from the middle of the area, began a volume at 22:50 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, 10.8 hours before the alert went out and 131 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
- 424 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 2704 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
037
WGUS55 KVEF 182246
FFWVEF
AZC015-NVC003-190100-
/O.NEW.KVEF.FF.W.0023.210718T2246Z-210719T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
346 PM PDT Sun Jul 18 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
North Central Mohave County in northwestern Arizona...
Northeastern Clark County in southern Nevada...
* Until 600 PM MST /600 PM PDT/.
* At 346 PM MST /346 PM PDT/, Doppler radar indicated thunderstorms
producing heavy rain across the warned area. Flash flooding is
ongoing or expected to begin shortly in Mesquite, Bunkerville, and
along Nevada State Route 170.
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...
Mesquite and Bunkerville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3635 11420 3675 11439 3676 11417 3681 11409
3681 11406 3684 11399 3681 11398 3679 11404
3636 11402
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JV2 follow-up statements
002
WGUS75 KVEF 190010
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
510 PM PDT Sun Jul 18 2021
AZC015-NVC003-190100-
/O.CON.KVEF.FF.W.0023.000000T0000Z-210719T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-Clark NV-
510 PM MST Sun Jul 18 2021 /510 PM PDT Sun Jul 18 2021/
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MST/6 PM PDT/
THIS EVENING FOR NORTH CENTRAL MOHAVE AND NORTHEASTERN CLARK
COUNTIES...
At 510 PM MST /510 PM PDT/, Doppler radar indicated thunderstorms
producing heavy rain across the warned area. Flash flooding is
ongoing or expected to begin shortly in Mesquite, Bunkerville, and
along Nevada State Route 170. Though heavy rain has ended, moderate
rain is expected to continue in the area, adding to the flash flood
threat.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Mesquite and Bunkerville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3635 11420 3675 11439 3676 11417 3681 11409
3681 11406 3684 11399 3681 11398 3679 11404
3636 11402
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JV473
WGUS75 KVEF 190052
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
552 PM PDT Sun Jul 18 2021
AZC015-NVC003-190102-
/O.EXP.KVEF.FF.W.0023.000000T0000Z-210719T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-Clark NV-
552 PM MST Sun Jul 18 2021 /552 PM PDT Sun Jul 18 2021/
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM MST/6 PM PDT/ THIS
EVENING FOR NORTH CENTRAL MOHAVE AND NORTHEASTERN CLARK COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures, if
applicable.
LAT...LON 3635 11420 3675 11439 3676 11417 3681 11409
3681 11406 3684 11399 3681 11398 3679 11404
3636 11402
$$
JVThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:33 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 57 min |
| Jul 18, 1:33 PM MST | Areal Flood Advisory | VEF | Mohave | 80 min |
| Jul 18, 2:51 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 18, 3:07 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 23 min |
| Jul 18, 3:14 PM MST | Flash Flood Warning | VEF | Mohave | 3 hr |
| Jul 18, 1:05 PM MST | Flash Flood Warning | VEF | Clark | 3 hr |
| Jul 18, 1:27 PM MST | Areal Flood Advisory | VEF | Clark | 3 hr |
| Jul 18, 4:01 PM MST | Flash Flood Warning | VEF | Clark | 119 min |
| Jul 18, 4:33 PM MST | Flash Flood Warning | VEF | Clark | 3 hr |
Nearby
Flash Flood Warnings in Arizona, 2021Flash Flood Warnings in Nevada, 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.