Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Las Vegas, NV

July 13, 2021Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 13, 2021, 8:52 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 53 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 13, 2021, 8:52 PM MST (03:52 UTC)
Expired
Jul 13, 2021, 9:45 PM MST
In force
53 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), 79 km from the middle of the area, began a volume at 03:51 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, 3.9 hours before the alert went out and 103 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-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2021-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 829 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2021-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
829 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
3527 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

988 
WUUS55 KVEF 140352
SVRVEF
AZC015-NVC003-140445-
/O.NEW.KVEF.SV.W.0020.210714T0352Z-210714T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
852 PM PDT Tue Jul 13 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 945 PM PDT/945 PM MST/.

* At 852 PM PDT/852 PM MST/, a severe thunderstorm was located over
  Echo Bay, or 13 miles south of Overton, and is nearly stationary.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

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

This includes Interstate 15 in Nevada between mile markers 116 and
120.
 
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 3636 11489 3682 11408 3631 11361 3592 11406
      3595 11487
TIME...MOT...LOC 0352Z 334DEG 4KT 3635 11439 

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

CP
1 follow-up statement
754 
WWUS55 KVEF 140438
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
938 PM PDT Tue Jul 13 2021

AZC015-NVC003-140447-
/O.EXP.KVEF.SV.W.0020.000000T0000Z-210714T0445Z/
Mohave AZ-Clark NV-
938 PM PDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MOHAVE AND
NORTHEASTERN CLARK COUNTIES WILL EXPIRE AT 945 PM PDT/945 PM MST/...
        
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning will be allowed to expire.  However 
gusty winds up to 40 mph are still possible.

LAT...LON 3636 11489 3682 11408 3631 11361 3592 11406
      3595 11487
TIME...MOT...LOC 0437Z 334DEG 4KT 3631 11436 

$$
CP

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 7:24 PM MSTSevere Thunderstorm WarningVEFMohave96 min
Jul 13, 8:29 PM MSTSevere Thunderstorm WarningVEFMohave91 min
Jul 14, 10:59 AM MSTFlash Flood WatchVEFMohave13 hr
Jul 13, 6:41 PM MSTSevere Thunderstorm WarningVEFLincoln49 min
Jul 13, 7:36 PM MSTSevere Thunderstorm WarningVEFClark69 min

Nearby

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