Alert archive / Nevada / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Las Vegas, NV

July 23, 2021Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 23, 2021, 7:58 PM PDT for Clark County, Nevada; Mohave County, Arizona. It was in force for 23 min. 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 23, 2021, 7:58 PM PDT (02:58 UTC)
Expired: Jul 23, 2021, 8:21 PM PDT
In force: 23 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Mohave County, AZ, Clark County, NV

The radar

The Las Vegas radar (KESX), 67 km from the middle of the area, began a volume at 02:58 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, 3.0 hours before the alert went out and 95 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 139 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 3163 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

100 
WUUS55 KVEF 240258
SVRVEF
AZC015-NVC003-240400-
/O.NEW.KVEF.SV.W.0032.210724T0258Z-210724T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
758 PM PDT Fri Jul 23 2021

The National Weather Service in Las Vegas has issued a

* Severe Thunderstorm Warning for...
  Northwestern Mohave County in northwestern Arizona...
  Northeastern Clark County in southern Nevada...

* Until 900 PM PDT/900 PM MST/.

* At 756 PM PDT/756 PM MST/, severe thunderstorms were located along
  a line extending from 7 miles west of Valley Of Fire to 15 miles
  north of South Cove, moving southwest at 25 mph.

  HAZARD...40-50 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Strong winds resulting in very dangerous boating 
           conditions on the lake and near marinas.

* Locations impacted include...
  Las Vegas Bay, Lake Las Vegas, Overton, Echo Bay, Las Vegas Bay
  Campground, Echo Bay Campground, Callville Bay, Meadview, Valley Of
  Fire, Callville Bay Campground, Lake Mead National Recreation Area,
  Temple Bar Campground, Overton Beach, South Cove and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

If on or near Echo Bay to Overton Beach, get away from the water and 
move indoors or inside a vehicle. Remember, lightning can strike out 
to 15 miles from the parent thunderstorm. If you can hear thunder, 
you are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

&&

LAT...LON 3610 11498 3586 11404 3640 11383 3658 11466
TIME...MOT...LOC 0256Z 024DEG 23KT 3646 11464 3632 11398 

HAIL...<.75IN
WIND...60MPH
 
$$

TB3

1 follow-up statement

268 
WWUS55 KVEF 240321
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
821 PM PDT Fri Jul 23 2021

AZC015-NVC003-240329-
/O.CAN.KVEF.SV.W.0032.000000T0000Z-210724T0400Z/
Mohave AZ-Clark NV-
821 PM PDT Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MOHAVE AND
NORTHEASTERN CLARK COUNTIES IS CANCELLED...
            
The outflow winds which prompted the warning have weakened and no 
longer pose an immediate threat to life or property. Therefore, the 
warning has been cancelled.  However gusty winds of 30-40 mph are 
still possible with these storms as well as occasional cloud to 
ground lightning. 

LAT...LON 3610 11498 3586 11404 3640 11383 3658 11466
TIME...MOT...LOC 0318Z 024DEG 23KT 3633 11471 3619 11405 

$$

TB3

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 5:52 PM PDT	Severe Thunderstorm Warning	VEF	Clark, Lincoln	53 min
Jul 23, 7:11 PM PDT	Severe Thunderstorm Warning	VEF	Clark	49 min
Jul 24, 4:42 PM PDT	Severe Thunderstorm Warning	VEF	Lincoln	48 min
Jul 23, 9:52 PM PDT	Severe Thunderstorm Warning	VEF	Mohave	29 min
Jul 23, 10:18 PM PDT	Severe Thunderstorm Warning	VEF	Mohave	42 min
Jul 23, 11:58 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Jul 24, 1:13 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 24, 1:26 PM PDT	Severe Thunderstorm Warning	VEF	Mohave	49 min
Jul 24, 3:18 PM PDT	Severe Thunderstorm Warning	VEF	Mohave	57 min
Jul 24, 3:21 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr

Nearby

Severe Thunderstorm Warnings in Nevada, 2021 Severe Thunderstorm Warnings in Arizona, 2021 Every severe thunderstorm 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.