Alert archive / Nevada / Flash Flood Warnings in 2021
Flash Flood Warning 53, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 22, 2021, 2:32 PM PDT for Clark County, Nevada. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 22, 2021, 2:32 PM PDT (21:32 UTC)
- Expired
- Jul 22, 2021, 5:45 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), 44 km from the middle of the area, began a volume at 21:37 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 22, 2:53 PM PDT | FLASH FLOOD | 2 Sw Sam Boyd Stadium, NV | 8-10 INCHES OF WATER COVERING THE INTERSECTION OF SUNSET AND STEPHANIE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 9.5 hours before the alert went out and 55 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.
256
WGUS55 KVEF 222132
FFWVEF
NVC003-230045-
/O.NEW.KVEF.FF.W.0053.210722T2132Z-210723T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
232 PM PDT Thu Jul 22 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Southern Clark County in southern Nevada...
* Until 545 PM PDT.
* At 232 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain in East Las Vegas and Henderson. Between 1 and 1.25
inches of rain have fallen. 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...
Henderson, Green Valley, Sam Boyd Stadium, Paradise and East Las
Vegas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3603 11512 3612 11509 3614 11503 3609 11501
3603 11503 3602 11507
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SC3 follow-up statements
481
WGUS75 KVEF 222154
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
254 PM PDT Thu Jul 22 2021
NVC003-230045-
/O.CON.KVEF.FF.W.0053.000000T0000Z-210723T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
254 PM PDT Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM PDT THIS
AFTERNOON FOR SOUTHERN CLARK COUNTY...
At 254 PM PDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain in East Las Vegas and Henderson.
The rain gauge at Pittman Park Detention Basin at the Arroyo Grande
Sports Complex has received 1.30 inches of rain, with most of it
falling between 215 pm and 245 pm. Flash flooding is ongoing and has
been observed at Sunset and Stephanie Streets. The Pittman Wash has
risen rapidly to 4 feet at the Pittman Detention Basin.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Henderson, Green Valley, Sam Boyd Stadium, Paradise and East Las
Vegas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3603 11512 3612 11509 3614 11503 3609 11501
3603 11503 3602 11507
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SC439
WGUS75 KVEF 230022
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
522 PM PDT Thu Jul 22 2021
NVC003-230045-
/O.CON.KVEF.FF.W.0053.000000T0000Z-210723T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
522 PM PDT Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM PDT THIS
AFTERNOON FOR SOUTHERN CLARK COUNTY...
At 522 PM PDT, Henderson Emergency Management as well as area
webcams reported several locations in East Las Vegas and Henderson
that received significant roadway flooding over the last couple
hours. Between 0.5 and 1.5 inches of rain has fallen in the warned
area. Flood waters are receding but may still be ongoing in some
locations.
HAZARD...Flooding from thunderstorms over the last 2 hours.
SOURCE...Emergency management and area webcams.
IMPACT...Flooding of washes as well as standing water across area
roadways and intersections
Some locations that will experience flash flooding include...
Henderson, Green Valley, Sam Boyd Stadium, Paradise and East Las
Vegas.
If no additional rainfall develops in the next 30 minutes, this
warning will be allowed to expire.
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 3603 11512 3612 11509 3614 11503 3609 11501
3603 11503 3602 11507
FLASH FLOOD...OBSERVED
$$
TB747
WGUS75 KVEF 230039
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
539 PM PDT Thu Jul 22 2021
NVC003-230049-
/O.EXP.KVEF.FF.W.0053.000000T0000Z-210723T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
539 PM PDT Thu Jul 22 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM PDT THIS AFTERNOON FOR
SOUTHERN CLARK COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flash Flood Watch remains in effect until 900 PM PDT for portions
of northwest Arizona and Nevada.
LAT...LON 3603 11512 3612 11509 3614 11503 3609 11501
3603 11503 3602 11507
$$
JVThe 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, 1:36 PM PDT | Flash Flood Warning | VEF | Clark | 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.