Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Cheyenne, WY

May 26, 2021Box Butte County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 26, 2021, 5:41 PM MDT for Box Butte County, Sioux County, Nebraska. It was in force for 34 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: May 26, 2021, 5:41 PM MDT (23:41 UTC)
Expired: May 26, 2021, 6:15 PM MDT
In force: 34 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.75 in
Wind: 60.0 mph

Counties Box Butte County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 185 km from the middle of the area, began a volume at 23:41 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
May 26, 1:27 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.7 hours before the alert went out and 206 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: 797 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 366 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

819 
WUUS55 KCYS 262341
SVRCYS
NEC013-165-270015-
/O.NEW.KCYS.SV.W.0022.210526T2341Z-210527T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
541 PM MDT Wed May 26 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Box Butte County in the Panhandle of Nebraska...
  Southeastern Sioux County in the Panhandle of Nebraska...

* Until 615 PM MDT.

* At 540 PM MDT, severe thunderstorms were located along a line
  extending from near Hemingford to 7 miles northwest of Kilpatrick
  Lake, moving east at 35 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Hemingford, Wild Horse Butte, Kilpatrick Lake and Berea. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4203 10296 4206 10335 4210 10343 4235 10341
      4243 10319 4243 10275 4236 10275
TIME...MOT...LOC 2340Z 286DEG 29KT 4234 10311 4216 10341 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Trudel

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 2:25 PM MDT	Special Weather Statement	CYS	Dawes	50 min
May 26, 2:50 PM MDT	Special Weather Statement	CYS	Sioux	40 min
May 26, 3:08 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	37 min
May 26, 3:17 PM MDT	Special Weather Statement	CYS	Dawes	43 min
May 26, 3:20 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	40 min
May 26, 3:45 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	45 min
May 26, 4:15 PM MDT	Special Weather Statement	CYS	Sioux	45 min
May 26, 4:29 PM MDT	Special Weather Statement	CYS	Dawes	46 min
May 26, 4:36 PM MDT	Special Weather Statement	CYS	Cheyenne, Kimball	39 min
May 26, 4:39 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	51 min
May 26, 4:47 PM MDT	Tornado Warning	CYS	Sioux	28 min
May 26, 5:18 PM MDT	Special Weather Statement	CYS	Morrill	42 min
May 26, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Morrill	33 min
May 26, 5:30 PM MDT	Severe Thunderstorm Warning	CYS	Banner	34 min
May 26, 5:32 PM MDT	Special Weather Statement	CYS	Box Butte	43 min
May 26, 5:42 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	30 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 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.