Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 89, NWS Cheyenne, WY

July 9, 2021Box Butte County, Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 9, 2021, 5:08 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 52 min. 8 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 9, 2021, 5:08 PM MDT (23:08 UTC)
Expired: Jul 9, 2021, 6:00 PM MDT
In force: 52 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 2.75 in
Wind: 60.0 mph

Counties Box Butte County, NE, Dawes County, NE

The radar

The Cheyenne radar (KCYS), 192 km from the middle of the area, began a volume at 23:07 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 9, 5:10 PM MDT	HAIL 2.5	1 Wsw Marsland, NE	LOCATION AND TIMING ESTIMATED FROM RADAR.
Jul 9, 5:21 PM MDT	HAIL 2	9 Ssw Marsland, NE
Jul 9, 5:34 PM MDT	HAIL 1.5	Alliance, NE	REPORT OF NEAR GOLF BALL SIZED HAIL IN DOWNTOWN ALLIANCE
Jul 9, 5:34 PM MDT	HAIL 1.5	Alliance, NE	REPORT OF NEAR GOLF BALL SIZED HAIL IN DOWNTOWN ALLIANCE.
Jul 9, 5:40 PM MDT	HAIL 4.25	12 Se Hemingford, NE	SOCIAL MEDIA REPORT WITH PHOTO
Jul 9, 5:40 PM MDT	HAIL 4.25	12 Se Hemingford, NE	SOCIAL MEDIA REPORT WITH PHOTO.
Jul 9, 5:45 PM MDT	HAIL 2.75	Alliance, NE
Jul 9, 5:50 PM MDT	HAIL 3	Alliance, NE

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
Jul 9, 2:16 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.1 hours before the alert went out and 208 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: 766 J/kg
Mixed-layer CIN: -307 J/kg
Mixed-layer LCL: 1363 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

346 
WUUS55 KCYS 092308
SVRCYS
NEC013-045-100000-
/O.NEW.KCYS.SV.W.0089.210709T2308Z-210710T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
508 PM MDT Fri Jul 9 2021

The National Weather Service in Cheyenne has issued a

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

* Until 600 PM MDT.

* At 508 PM MDT, a severe thunderstorm was located near Berea, or 14
  miles northwest of Alliance, moving southeast at 25 mph.

  This is a very dangerous storm.

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

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be severely injured. 
           Expect shattered windows, extensive damage to roofs, 
           siding, and vehicles.

* Locations impacted include...
  Alliance, Hemingford, Wild Horse Butte, Alliance Airport, Box Butte
  Campground, Berea, Flahertys Corner, Box Butte Dam and Marsland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4200 10297 4232 10345 4244 10344 4262 10321
      4236 10275 4210 10274 4209 10271 4206 10269
      4200 10270
TIME...MOT...LOC 2308Z 314DEG 22KT 4224 10309 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...60MPH
 
$$

Brothers

1 follow-up statement

596 
WWUS55 KCYS 092327
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
527 PM MDT Fri Jul 9 2021

NEC045-092335-
/O.CAN.KCYS.SV.W.0089.000000T0000Z-210710T0000Z/
Dawes NE-
527 PM MDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL DAWES 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 900 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4200 10297 4231 10343 4244 10334 4244 10289
      4236 10275 4210 10274 4209 10271 4206 10269
      4200 10270
TIME...MOT...LOC 2325Z 314DEG 22KT 4217 10299 

$$

NEC013-100000-
/O.CON.KCYS.SV.W.0089.000000T0000Z-210710T0000Z/
Box Butte NE-
527 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR BOX BUTTE COUNTY...

At 525 PM MDT, a severe thunderstorm was located over Berea, or 7 
miles northwest of Alliance, moving southeast at 25 mph. Additional 
storms were located west of Hemingford also moving southeast. Two 
inch hail was reported 9 miles south-southwest of Marsland at 522 PM 
MDT.

This is a very dangerous storm.

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

SOURCE...Trained spotter reported.

IMPACT...People and animals outdoors will be severely injured. 
         Expect shattered windows, extensive damage to roofs, 
         siding, and vehicles.

Locations impacted include...
Alliance, Hemingford, Wild Horse Butte, Berea and Alliance Airport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4200 10297 4231 10343 4244 10334 4244 10289
      4236 10275 4210 10274 4209 10271 4206 10269
      4200 10270
TIME...MOT...LOC 2325Z 314DEG 22KT 4217 10299 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...60MPH
 
$$

Brothers

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	40 min
Jul 9, 2:51 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	39 min
Jul 9, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	47 min
Jul 9, 3:32 PM MDT	Special Weather Statement	CYS	Sioux	28 min
Jul 9, 3:37 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball	42 min
Jul 9, 3:54 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	36 min
Jul 9, 4:30 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	45 min
Jul 9, 5:42 PM MDT	Tornado Warning	CYS	Box Butte	33 min
Jul 9, 5:49 PM MDT	Areal Flood Advisory	CYS	Box Butte, Morrill	3 hr
Jul 9, 5:58 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	47 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.