Alert archive / Nevada / Flash Flood Warnings in 2017
Flash Flood Warning 95, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 23, 2017, 2:53 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
- Aug 23, 2017, 2:53 PM PDT (21:53 UTC)
- Expired
- Aug 23, 2017, 6:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County Clark County, NV
The radar
The Las Vegas radar (KESX), 53 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 44 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
- 166 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 3048 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
264
WGUS55 KVEF 232153
FFWVEF
NVC003-240100-
/O.NEW.KVEF.FF.W.0095.170823T2153Z-170824T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
253 PM PDT WED AUG 23 2017
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Central Clark County in southern Nevada...
* Until 600 PM PDT
* At 252 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to one inch of rain has
already fallen. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
the Las Vegas Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3632 11536 3633 11510 3617 11471 3586 11490
3594 11517 3596 11531 3607 11535
$$
KG3 follow-up statements
867
WGUS75 KVEF 232233
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
333 PM PDT WED AUG 23 2017
NVC003-240100-
/O.CON.KVEF.FF.W.0095.000000T0000Z-170824T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
333 PM PDT WED AUG 23 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM PDT FOR
CENTRAL CLARK COUNTY...
At 331 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to one inch of rain has already
fallen. Flash flooding is expected to begin shortly.
Some locations that will experience flooding include...
eastern portions of the Las Vegas Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3619 11517 3631 11505 3617 11471 3586 11490
3594 11517 3595 11524 3605 11522
$$
KG462
WGUS75 KVEF 232329
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
429 PM PDT WED AUG 23 2017
NVC003-240100-
/O.CON.KVEF.FF.W.0095.000000T0000Z-170824T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
429 PM PDT WED AUG 23 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM PDT FOR
CENTRAL CLARK COUNTY...
At 428 PM PDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain over the warned area. Up to one
inch of rain has already fallen. Flash flooding is expected to begin
shortly.
Some locations that will experience flooding include...
the eastern Las Vegas Valley; primarily east of Interstate 15.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3619 11517 3631 11505 3617 11471 3586 11490
3594 11517 3595 11524 3605 11522
$$
KG255
WGUS75 KVEF 240050
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
550 PM PDT WED AUG 23 2017
NVC003-240100-
/O.EXP.KVEF.FF.W.0095.000000T0000Z-170824T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
550 PM PDT WED AUG 23 2017
...THE FLASH FLOOD WARNING FOR CENTRAL CLARK COUNTY WILL EXPIRE AT
600 PM PDT...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3619 11517 3631 11505 3617 11471 3586 11490
3594 11517 3595 11524 3605 11522
$$
KGThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 12:53 PM PDT | Flash Flood Warning | VEF | Clark | 6 hr |
| Aug 23, 1:39 PM PDT | Severe Thunderstorm Warning | VEF | Clark | 66 min |
Nearby
Flash Flood Warnings in Nevada, 2017Every flash flood warning in 2017
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.