Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS Cheyenne, WY

July 7, 2021Sioux County, Nebraska; Goshen County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 7, 2021, 4:39 PM MDT for Sioux County, Nebraska; Goshen County, Wyoming. It was in force for 51 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: Jul 7, 2021, 4:39 PM MDT (22:39 UTC)
Expired: Jul 7, 2021, 5:30 PM MDT
In force: 51 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 2.0 in
Wind: 60.0 mph

Counties Sioux County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 142 km from the middle of the area, began a volume at 22:41 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.

What was reported inside it

Time	Report	Where	Remark
Jul 7, 4:41 PM MDT	HAIL 1	11 Ese Jay Em, WY	DELAYED REPORT. TIME ESTIMATED FROM RADAR.
Jul 7, 4:41 PM MDT	HAIL 1	7 Sse Prairie Center, WY	DELAYED REPORT. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.7 hours before the alert went out and 219 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: 23 J/kg
Mixed-layer CIN: -353 J/kg
Mixed-layer LCL: 1431 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

408 
WUUS55 KCYS 072239
SVRCYS
NEC165-WYC015-072330-
/O.NEW.KCYS.SV.W.0082.210707T2239Z-210707T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
439 PM MDT Wed Jul 7 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Southwestern Sioux County in the Panhandle of Nebraska...
  Northeastern Goshen County in southeastern Wyoming...

* Until 530 PM MDT.

* At 438 PM MDT, a severe thunderstorm was located near Prairie
  Center, or 24 miles north of Torrington, moving south at 30 mph.

  HAZARD...Two inch 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...
  Lingle and Hwy 85 At Dry Rawhide Creek. 

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 4247 10427 4249 10407 4216 10387 4211 10440
TIME...MOT...LOC 2238Z 355DEG 24KT 4241 10419 

TORNADO...POSSIBLE
HAIL...2.00IN
WIND...60MPH
 
$$

Claycomb

3 follow-up statements

910 
WWUS55 KCYS 072251
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
451 PM MDT Wed Jul 7 2021

NEC165-WYC015-072330-
/O.CON.KCYS.SV.W.0082.000000T0000Z-210707T2330Z/
Sioux NE-Goshen WY-
451 PM MDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR SOUTHWESTERN SIOUX AND NORTHEASTERN GOSHEN COUNTIES...

At 451 PM MDT, a severe thunderstorm was located 10 miles south of
Prairie Center, or 20 miles north of Torrington, moving south at 25
mph.

HAZARD...70 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Lingle and Hwy 85 At Dry Rawhide Creek. 

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 4243 10425 4243 10406 4216 10387 4211 10440
TIME...MOT...LOC 2251Z 343DEG 20KT 4236 10413 

HAIL...1.25IN
WIND...70MPH
 
$$

Claycomb

070 
WWUS55 KCYS 072305
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
505 PM MDT Wed Jul 7 2021

NEC165-WYC015-072330-
/O.CON.KCYS.SV.W.0082.000000T0000Z-210707T2330Z/
Sioux NE-Goshen WY-
505 PM MDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR SOUTHWESTERN SIOUX AND EAST CENTRAL GOSHEN COUNTIES...

At 505 PM MDT, a severe thunderstorm was located 14 miles south of
Prairie Center, or 17 miles north of Torrington, moving south at 25
mph.

HAZARD...70 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

This severe thunderstorm will remain over mainly rural areas of
southwestern Sioux and east central Goshen Counties.

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 4237 10420 4240 10406 4216 10387 4214 10429
TIME...MOT...LOC 2305Z 339DEG 21KT 4231 10410 

HAIL...1.25IN
WIND...70MPH
 
$$

Claycomb

837 
WWUS55 KCYS 072321
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
521 PM MDT Wed Jul 7 2021

NEC165-WYC015-072331-
/O.EXP.KCYS.SV.W.0082.000000T0000Z-210707T2330Z/
Sioux NE-Goshen WY-
521 PM MDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SIOUX AND EAST
CENTRAL GOSHEN COUNTIES 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.

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

LAT...LON 4237 10420 4240 10406 4216 10387 4214 10429
TIME...MOT...LOC 2321Z 337DEG 23KT 4226 10405 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 3:58 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	47 min
Jul 7, 3:07 AM MDT	Red Flag Warning	CYS		41 hr
Jul 7, 1:38 PM MDT	Fire Weather Watch	CYS		13 hr
Jul 7, 2:59 PM MDT	Special Weather Statement	CYS	Niobrara	31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Severe Thunderstorm Warnings in Wyoming, 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.