Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 77, NWS Las Vegas, NV

October 5, 2021Mohave County, Arizona; Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Oct 5, 2021, 12:41 PM MST for Mohave County, Arizona; Clark County, Nevada. It was in force for 43 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: Oct 5, 2021, 12:41 PM MST (19:41 UTC)
Expired: Oct 5, 2021, 1:24 PM MST
In force: 43 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 19:42 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 5, 11:46 AM MST	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 7.7 hours before the alert went out and 114 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2875 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

280 
WUUS55 KVEF 051941
SVRVEF
AZC015-NVC003-052045-
/O.NEW.KVEF.SV.W.0077.211005T1941Z-211005T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
1241 PM PDT Tue Oct 5 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 145 PM PDT/145 PM MST/.

* At 1240 PM PDT/1240 PM MST/, a severe thunderstorm was located 
  over Lake Mead National Recreation Area, moving north at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

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

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 3596 11364 3591 11481 3615 11488 3632 11488
      3670 11438 3653 11376
TIME...MOT...LOC 1940Z 164DEG 20KT 3616 11427 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JS

1 follow-up statement

742 
WWUS55 KVEF 052024
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
124 PM PDT Tue Oct 5 2021

AZC015-NVC003-052032-
/O.CAN.KVEF.SV.W.0077.000000T0000Z-211005T2045Z/
Mohave AZ-Clark NV-
124 PM PDT Tue Oct 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MOHAVE AND
NORTHEASTERN CLARK COUNTIES IS CANCELLED...
                
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 has been cancelled.  

A Severe Thunderstorm Watch remains in effect until 800 PM PDT/800 PM
MST/ for northwestern Arizona.

LAT...LON 3596 11364 3591 11481 3615 11488 3632 11488
      3670 11438 3653 11376
TIME...MOT...LOC 2020Z 164DEG 20KT 3664 11461 

$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 5, 10:55 AM MST	Severe Thunderstorm Warning	VEF	Mohave	50 min
Oct 5, 11:42 AM MST	Severe Thunderstorm Warning Considerable damage threat	VEF	Mohave	63 min
Oct 5, 11:56 AM MST	Areal Flood Advisory	VEF	Mohave	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.