Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, 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, 9:50 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 55 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 12, 2021, 9:50 PM MST (04:50 UTC)
Expired: Jul 12, 2021, 10:45 PM MST
In force: 55 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), 83 km from the middle of the area, began a volume at 04:49 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.

What was reported inside it

Time	Report	Where	Remark
Jul 12, 9:51 PM MST	TSTM WND GST 59	1 S Moapa, NV	WIND MEASURED NEAR THE INTERSECTION OF PATRICK WAY AND S HENRIE DRIVE IN MOAPA. DATA COURTESY OF EARTH NETWORKS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 4.8 hours before the alert went out and 82 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.

531 
WUUS55 KVEF 130450
SVRVEF
AZC015-NVC003-130545-
/O.NEW.KVEF.SV.W.0012.210713T0450Z-210713T0545Z/

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

The National Weather Service in Las Vegas has issued a

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

* Until 1045 PM PDT/1045 PM MST/.

* At 949 PM PDT/949 PM MST/, a severe thunderstorm was located 10
  miles west of Valley Of Fire, or 14 miles south of Moapa Town,
  moving southeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

* Locations impacted include...
  Las Vegas Bay, Overton, Moapa Town, Moapa Valley, Echo Bay, Boulder
  Beach, Boulder Beach Campground, Callville Bay, Echo Bay
  Campground, Callville Bay Campground, Valley Of Fire, Overton
  Beach, Logandale, Hoover Dam and Lake Mead National Recreation
  Area.

This includes Interstate 15 in Nevada between mile markers 66 and
105.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3639 11488 3680 11487 3678 11436 3652 11416
      3604 11433 3601 11487
TIME...MOT...LOC 0449Z 317DEG 23KT 3649 11470 

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

JA

2 follow-up statements

138 
WWUS55 KVEF 130519
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1019 PM PDT Mon Jul 12 2021

AZC015-NVC003-130545-
/O.CON.KVEF.SV.W.0012.000000T0000Z-210713T0545Z/
Mohave AZ-Clark NV-
1019 PM PDT Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM
PDT/1045 PM MST/ FOR WEST CENTRAL MOHAVE AND NORTHEASTERN CLARK
COUNTIES...

At 1015 PM PDT/1015 PM MST/, a severe thunderstorm was located over 
the interstection of I-15 and Valley of Fire Highway moving 
southeast at 25 mph. A gust front preceding the storm was moving 
across Valley of Fire State Park, the Overton Arm of Lake Mead and 
was approaching the Boulder Basin and the Narrows Sections of Lake 
Mead.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs and trees.

Locations impacted include...
Las Vegas Bay, Overton, Moapa Town, Moapa Valley, Echo Bay, Boulder
Beach, Boulder Beach Campground, Callville Bay, Echo Bay Campground,
Callville Bay Campground, Valley Of Fire, Overton Beach, Logandale,
Hoover Dam and Lake Mead National Recreation Area.

This includes Interstate 15 in Nevada between mile markers 66 and
105.
 
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 3639 11488 3680 11487 3678 11436 3652 11416
      3604 11433 3601 11487
TIME...MOT...LOC 0515Z 313DEG 27KT 3631 11444 

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

JA

537 
WWUS55 KVEF 130550
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1050 PM PDT Mon Jul 12 2021

AZC015-NVC003-130557-
/O.EXP.KVEF.SV.W.0012.000000T0000Z-210713T0545Z/
Mohave AZ-Clark NV-
1050 PM PDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MOHAVE AND
NORTHEASTERN CLARK COUNTIES HAS EXPIRED...
    
The severe thunderstorm which prompted the warning has been replace 
by a new Severe Thunderstorm Warning including the east side of the 
Las Vegas Valley and Lake Mead that is in effect until 1130 PM.

LAT...LON 3639 11488 3680 11487 3678 11436 3652 11416
      3604 11433 3601 11487
TIME...MOT...LOC 0547Z 317DEG 23KT 3629 11474 

$$

JA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 10:44 PM MST	Severe Thunderstorm Warning	VEF	Mohave	46 min
Jul 12, 11:27 PM MST	Severe Thunderstorm Warning	VEF	Mohave	48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.