Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Las Vegas, NV

July 17, 2021Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 17, 2021, 5:33 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 57 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 17, 2021, 5:33 PM MST (00:33 UTC)
Expired: Jul 17, 2021, 6:30 PM MST
In force: 57 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), 54 km from the middle of the area, began a volume at 00:37 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.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 0.6 hours before the alert went out and 92 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: 415 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 3469 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

189 
WUUS55 KVEF 180033
SVRVEF
AZC015-NVC003-180130-
/O.NEW.KVEF.SV.W.0022.210718T0033Z-210718T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
533 PM PDT Sat Jul 17 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 630 PM PDT/630 PM MST/.

* At 532 PM PDT/532 PM MST/, a gust front was located 7 miles 
  northeast of Callville Bay Campground, or 14 miles northeast of 
  Las Vegas Bay, moving northwest at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

* Locations impacted include...
  Las Vegas Bay, Boulder Beach, Callville Bay Campground, Boulder
  Beach Campground, Las Vegas Bay Campground, Callville Bay, Hoover
  Dam and Lake Mead National Recreation Area.

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 3610 11425 3602 11443 3600 11472 3603 11487
      3613 11488 3626 11471 3624 11447
TIME...MOT...LOC 0032Z 154DEG 32KT 3620 11462 

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

2 follow-up statements

094 
WWUS55 KVEF 180111
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
611 PM PDT Sat Jul 17 2021

AZC015-NVC003-180130-
/O.CON.KVEF.SV.W.0022.000000T0000Z-210718T0130Z/
Mohave AZ-Clark NV-
611 PM PDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM
PDT/630 PM MST/ FOR WEST CENTRAL MOHAVE AND EAST CENTRAL CLARK
COUNTIES...

At 607 PM PDT/607 PM MST/, a gust front was located over Las Vegas 
Bay, moving northwest at 20 mph. Temple Bar recorded wind gusts over 
50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs and trees.

Locations impacted include...
Las Vegas Bay, Boulder Beach, Callville Bay Campground, Boulder Beach
Campground, Las Vegas Bay Campground, Callville Bay, Hoover Dam and
Lake Mead National Recreation Area.

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 3610 11425 3602 11443 3600 11472 3603 11487
      3613 11488 3626 11471 3624 11447
TIME...MOT...LOC 0107Z 118DEG 17KT 3609 11487 

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

269 
WWUS55 KVEF 180124
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
624 PM PDT Sat Jul 17 2021

AZC015-NVC003-180133-
/O.EXP.KVEF.SV.W.0022.000000T0000Z-210718T0130Z/
Mohave AZ-Clark NV-
624 PM PDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MOHAVE AND EAST
CENTRAL CLARK COUNTIES WILL EXPIRE AT 630 PM PDT/630 PM MST/...
                
The gust front which prompted the warning has weakened below severe 
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3610 11425 3602 11443 3600 11472 3603 11487
      3613 11488 3626 11471 3624 11447
TIME...MOT...LOC 0123Z 154DEG 32KT 3614 11490 

$$

CP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 1:33 PM MST	Areal Flood Advisory	VEF	Mohave	80 min
Jul 18, 2:51 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 18, 3:07 PM MST	Severe Thunderstorm Warning	VEF	Mohave	23 min
Jul 18, 3:14 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 18, 3:46 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Jul 18, 1:05 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Jul 18, 1:27 PM MST	Areal Flood Advisory	VEF	Clark	3 hr
Jul 18, 4:01 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	119 min
Jul 18, 4:33 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	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.