Alert archive / Nevada / Flash Flood Warnings in 2021
Flash Flood Warning 51, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 22, 2021, 1:36 PM PDT for Clark County, Nevada. 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 22, 2021, 1:36 PM PDT (20:36 UTC)
- Expired
- Jul 22, 2021, 4:45 PM PDT
- In force
- 3 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Clark County, NV
The radar
The Las Vegas radar (KESX), 72 km from the middle of the area, began a volume at 20:38 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, 8.6 hours before the alert went out and 24 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
- 112 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 2637 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
808
WGUS55 KVEF 222036
FFWVEF
NVC003-222345-
/O.NEW.KVEF.FF.W.0051.210722T2036Z-210722T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
136 PM PDT Thu Jul 22 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Central Clark County in southern Nevada...
* Until 445 PM PDT.
* At 136 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain in Lone Mountain and Summerlin. 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...
Las Vegas, Lone Mountain, Centennial Hills and Summerlin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3620 11541 3627 11538 3630 11536 3629 11525
3621 11525 3617 11532
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SC2 follow-up statements
027
WGUS75 KVEF 222141
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
241 PM PDT Thu Jul 22 2021
NVC003-222345-
/O.CON.KVEF.FF.W.0051.000000T0000Z-210722T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
241 PM PDT Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT THIS
AFTERNOON FOR CENTRAL CLARK COUNTY...
At 241 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain in Lone Mountain and Summerlin have diminished. However,
runnoff run the earlier heavy rain is likely still producing flash
flooding. The gauge at Lone Mountain and the Beltway has observed a
rise of 4.5 feet and the water is running rapidly through the
channel.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Lone Mountain, Centennial Hills and Summerlin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3620 11541 3627 11538 3630 11536 3629 11525
3621 11525 3617 11532
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SC069
WGUS75 KVEF 222339
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
439 PM PDT Thu Jul 22 2021
NVC003-222349-
/O.EXP.KVEF.FF.W.0051.000000T0000Z-210722T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
439 PM PDT Thu Jul 22 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 445 PM PDT THIS AFTERNOON FOR
CENTRAL CLARK COUNTY...
Any flood waters should have receded. Flooding is no longer expected
to pose a threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 900 PM PDT for portions
of northwest Arizona and Nevada.
LAT...LON 3620 11541 3627 11538 3630 11536 3629 11525
3621 11525 3617 11532
$$
SCThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 10:18 AM PDT | Flash Flood Watch | VEF | Clark, Lincoln, Nye | 11 hr |
| Jul 22, 12:53 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 26 min |
| Jul 22, 1:31 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 44 min |
| Jul 22, 1:35 PM PDT | Flash Flood Warning | VEF | Lincoln | 3 hr |
| Jul 22, 1:49 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 41 min |
| Jul 22, 2:20 PM PDT | Flash Flood Warning | VEF | Clark | 3 hr |
| Jul 22, 2:32 PM PDT | Flash Flood Warning | VEF | Clark | 3 hr |
| Jul 22, 3:03 PM PDT | Severe Thunderstorm Warning | VEF | Clark, Lincoln | 42 min |
| Jul 22, 3:21 PM PDT | Flash Flood Warning | VEF | Clark, Lincoln | 3 hr |
| Jul 22, 4:09 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 51 min |
Nearby
Flash 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.