Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 28, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 29, 2021, 6:46 PM MDT for Goshen County, Wyoming; Sioux County, Nebraska. It was in force for 29 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 29, 2021, 6:46 PM MDT (00:46 UTC)
- Expired
- May 29, 2021, 7:15 PM MDT
- In force
- 29 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Sioux County, NE, Goshen County, WY
The radar
The Cheyenne radar (KCYS), 127 km from the middle of the area, began a volume at 00:48 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 nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 0.8 hours before the alert went out and 234 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1648 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -38 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
445
WUUS55 KCYS 300046
SVRCYS
NEC165-WYC015-300115-
/O.NEW.KCYS.SV.W.0028.210530T0046Z-210530T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
646 PM MDT Sat May 29 2021
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
Southwestern Sioux County in the Panhandle of Nebraska...
East central Goshen County in southeastern Wyoming...
* Until 715 PM MDT.
* At 645 PM MDT, a severe thunderstorm was located 7 miles north of
Torrington, moving east at 20 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.
* 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.
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4213 10423 4219 10425 4230 10400 4214 10394
TIME...MOT...LOC 0045Z 249DEG 19KT 4217 10417
HAIL...1.50IN
WIND...60MPH
$$
Jamski2 follow-up statements
663
WWUS55 KCYS 300059
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
659 PM MDT Sat May 29 2021
NEC165-WYC015-300115-
/O.CON.KCYS.SV.W.0028.000000T0000Z-210530T0115Z/
Sioux NE-Goshen WY-
659 PM MDT Sat May 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR SOUTHWESTERN SIOUX AND EAST CENTRAL GOSHEN COUNTIES...
At 658 PM MDT, a severe thunderstorm was located 10 miles northeast
of Torrington, moving east at 20 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
southwestern Sioux and east central Goshen Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4215 10416 4221 10420 4230 10400 4214 10394
TIME...MOT...LOC 0058Z 249DEG 19KT 4220 10408
HAIL...1.50IN
WIND...60MPH
$$
Jamski500
WWUS55 KCYS 300113
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
713 PM MDT Sat May 29 2021
NEC165-WYC015-300123-
/O.EXP.KCYS.SV.W.0028.000000T0000Z-210530T0115Z/
Sioux NE-Goshen WY-
713 PM MDT Sat May 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SIOUX AND EAST
CENTRAL GOSHEN COUNTIES WILL EXPIRE AT 715 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 small
hail, gusty winds and heavy rain are 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 4215 10416 4221 10420 4230 10400 4214 10394
TIME...MOT...LOC 0113Z 249DEG 19KT 4223 10399
$$
JamskiThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 6:02 PM MDT | Special Weather Statement | CYS | Goshen | 43 min |
| May 29, 6:17 PM MDT | Special Weather Statement | CYS | Platte | 43 min |
| May 29, 6:39 PM MDT | Special Weather Statement | CYS | Goshen | 36 min |
| May 29, 7:18 PM MDT | Special Weather Statement | CYS | Sioux | 42 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2021Severe Thunderstorm Warnings in Nebraska, 2021Every 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.