Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, 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, 10:44 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 46 min. 2 reports 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, 10:44 PM MST (05:44 UTC)
Expired: Jul 12, 2021, 11:30 PM MST
In force: 46 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), 61 km from the middle of the area, began a volume at 05:49 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, 10:56 PM MST	TSTM WND GST 58	3 Nw Green Valley, NV	MCCARRAN INTERNATIONAL AIRPORT ASOS REPORTED A GUST OF 51 KTS OR 59 MPH AT 1056PM PT AND LASTED UNTIL 1105PM PT.
Jul 12, 11:00 PM MST	TSTM WND DMG	1 E Downtown Las Vegas, NV	TREE SNAPPED AND IS IN POWERLINES AS REPORTED BY THE LAS VEGAS FIRE AND RESCUE TEAM. ESTIMATED TIME OF TREE FALL 1100PM LOCAL. TIME ESTIMATED BY RADAR AND OTHER OBSERVATIONS IN THE AREA.

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, 5.7 hours before the alert went out and 66 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.

241 
WUUS55 KVEF 130544
SVRVEF
AZC015-NVC003-130630-
/O.NEW.KVEF.SV.W.0013.210713T0544Z-210713T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
1044 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 1130 PM PDT/1130 PM MST/.

* At 1043 PM PDT/1043 PM MST/, a severe thunderstorm was located 
  over the east side of the Las Vegas Valley to 10 miles north of 
  Callville Bay Campground, moving south 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...
  Las Vegas, Henderson, North Las Vegas, Boulder City, Anthem, The
  Strip, Nellis AFB, Downtown Las Vegas, East Las Vegas, Sam Boyd
  Stadium, The Motor Speedway, Las Vegas Bay, Southern Highlands,
  Lake Las Vegas, Overton, Green Valley, Paradise, Enterprise, Moapa
  Valley and Echo Bay.

This includes Interstate 15 in Nevada between mile markers 60 and 70.
 
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 3638 11513 3658 11440 3595 11424 3595 11521
TIME...MOT...LOC 0543Z 337DEG 19KT 3630 11474 

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

JA

2 follow-up statements

023 
WWUS55 KVEF 130622
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1122 PM PDT Mon Jul 12 2021

AZC015-NVC003-130630-
/O.CON.KVEF.SV.W.0013.000000T0000Z-210713T0630Z/
Mohave AZ-Clark NV-
1122 PM PDT Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM
PDT/1130 PM MST/ FOR WEST CENTRAL MOHAVE AND NORTHEASTERN CLARK
COUNTIES...

At 1119 PM PDT/1119 PM MST/, a severe thunderstorm was located over 
Calville Bay and the Boudler Basin of Lake Mead, moving southeast at 
25 mph. Gusts up to 59 mph have been observed in the Las Vegas 
Valley. Gusts up to 70 mph and quarter size hail are still likely 
over Lake Mead.

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...
Henderson, North Las Vegas, Boulder City, Anthem, The Strip, Nellis 
AFB, Downtown Las Vegas, East Las Vegas, Sam Boyd Stadium, The Motor 
Speedway, Las Vegas Bay, Southern Highlands, Lake Las Vegas, 
Overton, Green Valley, Paradise, Enterprise, Moapa Valley and Echo 
Bay.

This includes Interstate 15 in Nevada between mile markers 60 and 70.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and 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 3638 11513 3658 11440 3595 11424 3595 11521
TIME...MOT...LOC 0619Z 336DEG 24KT 3602 11466 

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

JA

382 
WWUS55 KVEF 130630
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1130 PM PDT Mon Jul 12 2021

AZC015-NVC003-130638-
/O.EXP.KVEF.SV.W.0013.000000T0000Z-210713T0630Z/
Mohave AZ-Clark NV-
1130 PM PDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MOHAVE AND
NORTHEASTERN CLARK COUNTIES WILL EXPIRE AT 1130 PM PDT/1130 PM
MST/...
        
The storm which prompted the warning has moved out of the Las Vegas 
Valley, but was still over Lake Mead. Therefore, the warning will be 
allowed to expire for the Las Vegas Valley.

Remember, a Severe Thunderstorm Warning still remains in effect for
the area around Lake Mead.

LAT...LON 3638 11513 3658 11440 3595 11424 3595 11521
TIME...MOT...LOC 0628Z 337DEG 19KT 3598 11464 

$$

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, 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.