Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 7, NWS Cheyenne, WY

May 21, 2021Box Butte County, Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 21, 2021, 4:38 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 52 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: May 21, 2021, 4:38 PM MDT (22:38 UTC)
Expired: May 21, 2021, 5:30 PM MDT
In force: 52 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Box Butte County, NE, Dawes County, NE

The radar

The Rapid City radar (KUDX), 165 km from the middle of the area, began a volume at 22:38 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
May 21, 5:35 PM MDT	HAIL 1.5	Chadron, NE	AT THE JOB CORPS BUILDING.
May 21, 5:38 PM MDT	HAIL 1.75	12 S Chadron, NE	MANY QUARTER SIZE HAIL AND A FEW GOLFBALL SIZE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 21, 4:17 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.6 hours before the alert went out and 158 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: 1093 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 324 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

323 
WUUS55 KCYS 212238
SVRCYS
NEC013-045-212330-
/O.NEW.KCYS.SV.W.0007.210521T2238Z-210521T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
438 PM MDT Fri May 21 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  North central Box Butte County in the Panhandle of Nebraska...
  Dawes County in the Panhandle of Nebraska...

* Until 530 PM MDT.

* At 437 PM MDT, a severe thunderstorm was located near Box Butte
  Campground, or 22 miles south of Chadron, moving north at 45 mph.

  HAZARD...Ping pong 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...
  Chadron, Chadron Campground, Box Butte Campground, Red Cloud
  Campground, Chadron Airport, Box Butte Dam and Chadron St Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4235 10312 4244 10326 4300 10322 4300 10280
      4279 10279 4278 10277 4247 10277
TIME...MOT...LOC 2237Z 192DEG 49KT 4252 10315 

HAIL...1.50IN
WIND...60MPH
 
$$

Claycomb

3 follow-up statements

128 
WWUS55 KCYS 212244
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
444 PM MDT Fri May 21 2021

NEC013-212253-
/O.CAN.KCYS.SV.W.0007.000000T0000Z-210521T2330Z/
Box Butte NE-
444 PM MDT Fri May 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BOX BUTTE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4252 10325 4300 10322 4300 10280 4279 10279
      4278 10277 4246 10295 4244 10311
TIME...MOT...LOC 2243Z 192DEG 46KT 4257 10312 

$$

NEC045-212330-
/O.CON.KCYS.SV.W.0007.000000T0000Z-210521T2330Z/
Dawes NE-
444 PM MDT Fri May 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR EASTERN DAWES COUNTY...

At 443 PM MDT, a severe thunderstorm was located 7 miles north of 
Box Butte Campground, or 18 miles south of Chadron, moving north at 
45 mph.

HAZARD...Ping pong 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...
Chadron, Chadron Campground, Box Butte Campground, Red Cloud
Campground, Chadron Airport, Box Butte Dam and Chadron St Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Cheyenne.

&&

LAT...LON 4252 10325 4300 10322 4300 10280 4279 10279
      4278 10277 4246 10295 4244 10311
TIME...MOT...LOC 2243Z 192DEG 46KT 4257 10312 

HAIL...1.50IN
WIND...60MPH
 
$$

Claycomb

100 
WWUS55 KCYS 212316
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
516 PM MDT Fri May 21 2021

NEC045-212330-
/O.CON.KCYS.SV.W.0007.000000T0000Z-210521T2330Z/
Dawes NE-
516 PM MDT Fri May 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR EASTERN DAWES COUNTY...

At 516 PM MDT, a severe thunderstorm was located near Chadron, moving
north at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Chadron, Chadron Campground, Box Butte Campground, Red Cloud
Campground, Chadron Airport, Box Butte Dam and Chadron St Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Cheyenne.

&&

LAT...LON 4252 10325 4300 10322 4300 10280 4279 10279
      4278 10277 4246 10295 4244 10311
TIME...MOT...LOC 2316Z 191DEG 48KT 4288 10301 

HAIL...1.00IN
WIND...60MPH
 
$$

Claycomb

795 
WWUS55 KCYS 212321
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
521 PM MDT Fri May 21 2021

NEC045-212330-
/O.EXP.KCYS.SV.W.0007.000000T0000Z-210521T2330Z/
Dawes NE-
521 PM MDT Fri May 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DAWES COUNTY WILL
EXPIRE AT 530 PM MDT...
                
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 heavy rain
is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.

LAT...LON 4252 10325 4300 10322 4300 10280 4279 10279
      4278 10277 4246 10295 4244 10311
TIME...MOT...LOC 2320Z 192DEG 49KT 4292 10300 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 6:10 PM MDT	Special Weather Statement	CYS	Banner	50 min
May 20, 6:49 PM MDT	Special Weather Statement	CYS	Scotts Bluff	41 min
May 20, 6:54 PM MDT	Special Weather Statement	CYS	Kimball	51 min
May 20, 7:07 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	38 min
May 20, 7:15 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	45 min
May 20, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	39 min
May 20, 8:36 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	24 min
May 21, 4:10 PM MDT	Special Weather Statement	CYS	Dawes	50 min
May 21, 4:28 PM MDT	Special Weather Statement	CYS	Box Butte	47 min
May 21, 5:26 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	49 min
May 21, 5:32 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	43 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.