Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 14, NWS Las Vegas, NV

July 12, 2021Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 12, 2021, 11:27 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 48 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 12, 2021, 11:27 PM MST (06:27 UTC)
Expired: Jul 13, 2021, 12:15 AM MST
In force: 48 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Mohave County, AZ, Clark County, NV

The radar

The Las Vegas radar (KESX), 50 km from the middle of the area, began a volume at 06:31 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, 6.5 hours before the alert went out and 83 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: 1416 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 3734 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

413 
WUUS55 KVEF 130627
SVRVEF
AZC015-NVC003-130715-
/O.NEW.KVEF.SV.W.0014.210713T0627Z-210713T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
1127 PM PDT Mon Jul 12 2021

The National Weather Service in Las Vegas has issued a

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

* Until 1215 AM PDT/1215 AM MST/.

* At 1124 PM PDT/1124 PM MST/, a severe thunderstorm was located 
  over Callville Bay and the Boulder Basin of Lake Mead near Hoover 
  Dam, moving southeast at 20 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Boulder City, Boulder Beach, Callville Bay Campground, Boulder
  Beach 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.

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. 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 3624 11487 3624 11449 3593 11428 3594 11484
TIME...MOT...LOC 0624Z 337DEG 19KT 3599 11465 

HAIL...1.00IN
WIND...70MPH
 
$$

JA

1 follow-up statement

687 
WWUS55 KVEF 130707
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1207 AM PDT Tue Jul 13 2021

AZC015-NVC003-130715-
/O.EXP.KVEF.SV.W.0014.000000T0000Z-210713T0715Z/
Mohave AZ-Clark NV-
1207 AM PDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MOHAVE AND
SOUTHEASTERN CLARK COUNTIES WILL EXPIRE AT 1215 AM PDT/1215 AM
MST/...
                
The storm which prompted the warning over the Boulder Basin of Lake 
Mead 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 3624 11487 3624 11449 3593 11428 3594 11484
TIME...MOT...LOC 0705Z 337DEG 19KT 3580 11455 

$$

JA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 9:50 PM MST	Severe Thunderstorm Warning	VEF	Mohave	55 min
Jul 12, 10:44 PM MST	Severe Thunderstorm Warning	VEF	Mohave	46 min
Jul 12, 10:28 PM MST	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Jul 13, 4:19 PM MST	Severe Thunderstorm Warning	VEF	Lincoln, Nye	56 min

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.