Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Cheyenne, WY

July 2, 2021Goshen County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 2, 2021, 7:47 PM MDT for Goshen County, Wyoming. It was in force for 36 min. 1 report 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 2, 2021, 7:47 PM MDT (01:47 UTC)
Expired: Jul 2, 2021, 8:23 PM MDT
In force: 36 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 2.75 in
Wind: 60.0 mph

County Goshen County, WY

The radar

The Cheyenne radar (KCYS), 151 km from the middle of the area, began a volume at 01:50 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 2, 7:50 PM MDT	HAIL 1	1 N Jay Em, WY

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 00:00Z, 1.8 hours before the alert went out and 212 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: 1233 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 2200 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

873 
WUUS55 KCYS 030147
SVRCYS
WYC015-030245-
/O.NEW.KCYS.SV.W.0071.210703T0147Z-210703T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
747 PM MDT Fri Jul 2 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Northeastern Goshen County in southeastern Wyoming...

* Until 845 PM MDT.

* At 746 PM MDT, a severe thunderstorm was located over Jay Em, or 19
  miles south of Lusk, moving east at 20 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...
  Prairie Center and Jay Em. 

This replaces the Severe Thunderstorm Warning which was previously 
in effect for the warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

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 4228 10406 4244 10448 4258 10445 4260 10405
TIME...MOT...LOC 0146Z 289DEG 18KT 4249 10437 

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

Hammer

3 follow-up statements

652 
WWUS55 KCYS 030201
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
801 PM MDT Fri Jul 2 2021

WYC015-030245-
/O.CON.KCYS.SV.W.0071.000000T0000Z-210703T0245Z/
Goshen WY-
801 PM MDT Fri Jul 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MDT
FOR NORTHEASTERN GOSHEN COUNTY...

At 801 PM MDT, a severe thunderstorm was located near Prairie Center,
or 21 miles southeast of Lusk, moving east at 25 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...
Prairie Center and Jay Em. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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 10440 4257 10433 4260 10405 4235 10406
TIME...MOT...LOC 0201Z 275DEG 20KT 4249 10426 

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

Hammer

235 
WWUS55 KCYS 030215
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
815 PM MDT Fri Jul 2 2021

WYC015-030245-
/O.CON.KCYS.SV.W.0071.000000T0000Z-210703T0245Z/
Goshen WY-
815 PM MDT Fri Jul 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MDT
FOR NORTHEASTERN GOSHEN COUNTY...

At 814 PM MDT, a severe thunderstorm was located near Prairie Center,
or 23 miles southeast of Lusk, moving east at 15 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...
Prairie Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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 4241 10432 4251 10429 4252 10406 4235 10406
TIME...MOT...LOC 0214Z 287DEG 14KT 4245 10424 

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

Hammer

238 
WWUS55 KCYS 030223
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
823 PM MDT Fri Jul 2 2021

WYC015-030233-
/O.CAN.KCYS.SV.W.0071.000000T0000Z-210703T0245Z/
Goshen WY-
823 PM MDT Fri Jul 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GOSHEN COUNTY 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.

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

LAT...LON 4241 10432 4251 10429 4252 10406 4235 10406
TIME...MOT...LOC 0221Z 289DEG 18KT 4243 10418 

$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 6:22 PM MDT	Special Weather Statement	CYS		38 min
Jul 2, 6:30 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	30 min
Jul 2, 6:44 PM MDT	Special Weather Statement	CYS	Platte	46 min
Jul 2, 7:00 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	60 min
Jul 2, 7:05 PM MDT	Special Weather Statement	CYS	Niobrara	40 min
Jul 3, 12:27 PM MDT	Special Weather Statement	CYS	Platte	48 min
Jul 3, 12:35 PM MDT	Special Weather Statement	CYS	Laramie	40 min
Jul 3, 1:47 PM MDT	Special Weather Statement	CYS	Laramie	43 min
Jul 3, 2:42 PM MDT	Special Weather Statement	CYS	Goshen	48 min
Jul 3, 3:01 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	30 min

Nearby

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.