Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS Las Vegas, NV

July 29, 2021Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Jul 29, 2021, 6:04 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 56 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 29, 2021, 6:04 PM MST (01:04 UTC)
Expired: Jul 29, 2021, 7:00 PM MST
In force: 56 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), 17 km from the middle of the area, began a volume at 01:09 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, 1.1 hours before the alert went out and 80 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: 175 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 3675 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

293 
WUUS55 KVEF 300104
SVRVEF
AZC015-NVC003-300200-
/O.NEW.KVEF.SV.W.0049.210730T0104Z-210730T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
604 PM PDT Thu Jul 29 2021

The National Weather Service in Las Vegas has issued a

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

* Until 700 PM PDT/700 PM MST/.

* At 604 PM PDT/604 PM MST/, a severe thunderstorm was located near
  Railroad Pass, or near Boulder City, moving northwest at 10 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

* Locations impacted include...
  Henderson, Boulder City, Anthem, Southern Highlands, Enterprise,
  Boulder Beach, Sloan, Railroad Pass, Boulder Beach Campground,
  Seven Hills, Hoover Dam, Black Mtn and Willow Beach.

This includes Interstate 15 in Nevada between mile markers 13 and 25.
 
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 3590 11457 3543 11503 3563 11518 3581 11536
      3595 11522 3607 11493 3608 11468
TIME...MOT...LOC 0104Z 147DEG 7KT 3592 11493 

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

CP

2 follow-up statements

835 
WWUS55 KVEF 300132
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
632 PM PDT Thu Jul 29 2021

AZC015-NVC003-300200-
/O.CON.KVEF.SV.W.0049.000000T0000Z-210730T0200Z/
Mohave AZ-Clark NV-
632 PM PDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM
PDT/700 PM MST/ FOR NORTHWESTERN MOHAVE AND CENTRAL CLARK COUNTIES...

At 629 PM PDT/629 PM MST/, a severe thunderstorm was located near 
Railroad Pass, or near Henderson, moving northwest at 10 mph. A 
thunderstorm has produced 62 mph. These thunderstorms are capable of 
producing isolated microburst winds up to 60 mph. 

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs and trees.

Locations impacted include...
Henderson, Boulder City, Anthem, Southern Highlands, Enterprise,
Boulder Beach, Sloan, Railroad Pass, Boulder Beach Campground, Seven
Hills, Hoover Dam, Black Mtn and Willow Beach.

This includes Interstate 15 in Nevada between mile markers 13 and 25.
 
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 3590 11457 3543 11503 3563 11518 3581 11536
      3595 11522 3607 11493 3608 11468
TIME...MOT...LOC 0129Z 147DEG 7KT 3596 11496 

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

890 
WWUS55 KVEF 300152
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
652 PM PDT Thu Jul 29 2021

AZC015-NVC003-300201-
/O.EXP.KVEF.SV.W.0049.000000T0000Z-210730T0200Z/
Mohave AZ-Clark NV-
652 PM PDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MOHAVE AND
CENTRAL CLARK COUNTIES WILL EXPIRE AT 700 PM PDT/700 PM MST/...
                
The storm 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.  However gusty
winds up to 45 mph are still possible.

LAT...LON 3590 11457 3543 11503 3563 11518 3581 11536
      3595 11522 3607 11493 3608 11468
TIME...MOT...LOC 0151Z 147DEG 7KT 3599 11499 

$$

CP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:12 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	2 hr
Jul 30, 12:04 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 30, 12:36 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 30, 1:14 PM MST	Severe Thunderstorm Warning	VEF	Mohave	61 min
Jul 30, 2:22 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 30, 4:17 PM MST	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Jul 29, 8:22 PM MST	Areal Flood Advisory	VEF	Clark	3 hr
Jul 30, 2:39 PM MST	Areal Flood Advisory	VEF	Clark	3 hr
Jul 30, 4:07 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.