Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Las Vegas, NV

July 22, 2021Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 22, 2021, 4:09 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 51 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 22, 2021, 4:09 PM MST (23:09 UTC)
Expired: Jul 22, 2021, 5:00 PM MST
In force: 51 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), 39 km from the middle of the area, began a volume at 23:07 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 12:00Z, 11.2 hours before the alert went out and 94 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

025 
WUUS55 KVEF 222309
SVRVEF
AZC015-NVC003-230000-
/O.NEW.KVEF.SV.W.0029.210722T2309Z-210723T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
409 PM PDT Thu Jul 22 2021

The National Weather Service in Las Vegas has issued a

* Severe Thunderstorm Warning for...
  West central Mohave County in northwestern Arizona...
  East central Clark County in southern Nevada...

* Until 500 PM PDT/500 PM MST/.

* At 409 PM PDT/409 PM MST/, a severe thunderstorm was located over
  Hoover Dam, or near Boulder City, moving east at 10 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

* Locations impacted include...
  Boulder City, Boulder Beach, Callville Bay Campground, Temple Bar
  Campground, Boulder Beach Campground, Callville Bay, Hoover Dam,
  Lake Mead National Recreation Area, Willow Beach and Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Wind damage with this storm 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 Lake Mead, 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 3582 11483 3613 11486 3631 11446 3599 11422
      3578 11451
TIME...MOT...LOC 2309Z 266DEG 9KT 3602 11474 

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

SC

2 follow-up statements

950 
WWUS55 KVEF 222337
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
437 PM PDT Thu Jul 22 2021

AZC015-NVC003-230000-
/O.CON.KVEF.SV.W.0029.000000T0000Z-210723T0000Z/
Mohave AZ-Clark NV-
437 PM PDT Thu Jul 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM
PDT/500 PM MST/ FOR WEST CENTRAL MOHAVE AND EAST CENTRAL CLARK
COUNTIES...

At 432 PM PDT/432 PM MST/, a line of severe winds was moving to the 
east across Lake Mead at 15 mph.

HAZARD...50 to 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs and trees.

Locations impacted include...
Callville Bay Campground, Temple Bar Campground, Callville Bay, 
Hoover Dam, Lake Mead National Recreation Area, Willow Beach and 
Temple Bar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with this storm 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 Lake Mead, 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 3582 11483 3613 11486 3631 11446 3599 11422
      3578 11451
TIME...MOT...LOC 2332Z 266DEG 9KT 3602 11467 

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

SC

510 
WWUS55 KVEF 222352
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
452 PM PDT Thu Jul 22 2021

AZC015-NVC003-230000-
/O.EXP.KVEF.SV.W.0029.000000T0000Z-210723T0000Z/
Mohave AZ-Clark NV-
452 PM PDT Thu Jul 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MOHAVE AND EAST
CENTRAL CLARK COUNTIES WILL EXPIRE AT 500 PM PDT/500 PM MST/...
                
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning will be allowed to expire.  However 
gusty winds are still possible through 600 PM, particularly at 
Temple Bar.

LAT...LON 3582 11483 3613 11486 3631 11446 3599 11422
      3578 11451
TIME...MOT...LOC 2350Z 266DEG 9KT 3602 11463 

$$

SC

The 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 MST	Flash Flood Watch	VEF	Mohave	11 hr
Jul 22, 1:13 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 22, 12:53 PM MST	Severe Thunderstorm Warning	VEF	Clark	26 min
Jul 22, 1:31 PM MST	Severe Thunderstorm Warning	VEF	Clark	44 min
Jul 22, 1:35 PM MST	Flash Flood Warning Considerable damage threat	VEF	Lincoln	3 hr
Jul 22, 1:36 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Jul 22, 1:49 PM MST	Severe Thunderstorm Warning	VEF	Clark	41 min
Jul 22, 2:20 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Jul 22, 2:32 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Jul 22, 3:03 PM MST	Severe Thunderstorm Warning	VEF	Clark, Lincoln	42 min
Jul 22, 3:21 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark, Lincoln	3 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Severe Thunderstorm Warnings in Nevada, 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.