Alert archive / Nevada / Flash Flood Warnings in 2019

Flash Flood Warning 49, NWS Las Vegas, NV

September 23, 2019Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Sep 23, 2019, 7:05 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
Sep 23, 2019, 7:05 PM PDT (02:05 UTC)
Expired
Sep 23, 2019, 10:00 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), 20 km from the middle of the area, began a volume at 02:07 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 00:00Z, 2.1 hours before the alert went out and 115 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.

Skew-T log-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2019-09-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 92 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2019-09-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
92 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
2880 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

738 
WGUS55 KVEF 240205
FFWVEF
NVC003-240500-
/O.NEW.KVEF.FF.W.0049.190924T0205Z-190924T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
705 PM PDT Mon Sep 23 2019

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  South central Clark County in southern Nevada...

* Until 1000 PM PDT.

* At 703 PM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain across southern Clark County. Up to one to two inches 
  of rain has already fallen. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Searchlight, Cottonwood Cove, Nipton Road Mile Marker 3, Cottonwood
  Cove Campground and Cal-Nev-Ari.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3539 11512 3552 11521 3574 11504 3581 11481
      3571 11470 3568 11468 3565 11469 3561 11465
      3558 11467 3553 11466 3551 11468 3545 11466
      3542 11464 3528 11464 3528 11486

$$
CK
2 follow-up statements
126 
WGUS75 KVEF 240243
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
743 PM PDT Mon Sep 23 2019

NVC003-240500-
/O.CON.KVEF.FF.W.0049.000000T0000Z-190924T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
743 PM PDT Mon Sep 23 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM PDT FOR
SOUTH CENTRAL CLARK COUNTY...

At 742 PM PDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Up to one to two inches of rain has 
already fallen. Flash flooding is expected to begin shortly.

Some locations that will experience flooding include...
Searchlight, Cottonwood Cove, Nipton Road Mile Marker 3, Cottonwood
Cove Campground and Cal-Nev-Ari.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3539 11512 3552 11521 3574 11504 3581 11481
      3571 11470 3568 11468 3565 11469 3561 11465
      3558 11467 3553 11466 3551 11468 3545 11466
      3542 11464 3528 11464 3528 11486

$$
CK
150 
WGUS75 KVEF 240450
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
950 PM PDT Mon Sep 23 2019

NVC003-240500-
/O.EXP.KVEF.FF.W.0049.000000T0000Z-190924T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
950 PM PDT Mon Sep 23 2019

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL CLARK COUNTY WILL EXPIRE
AT 1000 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 3539 11512 3552 11521 3574 11504 3581 11481
      3571 11470 3568 11468 3565 11469 3561 11465
      3558 11467 3553 11466 3551 11468 3545 11466
      3542 11464 3528 11464 3528 11486

$$

CK

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 23, 6:03 PM PDTSevere Thunderstorm WarningVEFClark57 min
Sep 24, 2:25 PM PDTFlash Flood WatchVEFClark51 hr

Nearby

Flash Flood Warnings in Nevada, 2019Every flash flood warning in 2019

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.