Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 70, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 2, 2021, 7:00 PM MDT for Goshen County, Niobrara County, Platte County, Wyoming. It was in force for 60 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 2, 2021, 7:00 PM MDT (01:00 UTC)
- Expired
- Jul 2, 2021, 8:00 PM MDT
- In force
- 60 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Goshen County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 156 km from the middle of the area, began a volume at 01:00 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, 7:25 PM MDT | HAIL 2 | 9 Wnw Jay Em, WY | LAWN WAS COVERED IN WHITE 2.0 INCH HAIL, HAIL RIPPED PAINT OFF OF HOME NEAR THE WINDOWS, GARDEN DESTROYED. |
| 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, 1.0 hours before the alert went out and 218 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
- 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
The text
As transmitted.
510
WUUS55 KCYS 030100
SVRCYS
WYC015-027-031-030200-
/O.NEW.KCYS.SV.W.0070.210703T0100Z-210703T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
700 PM MDT Fri Jul 2 2021
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
South central Niobrara County in east central Wyoming...
Northwestern Goshen County in southeastern Wyoming...
Northeastern Platte County in southeastern Wyoming...
* Until 800 PM MDT.
* At 700 PM MDT, a severe thunderstorm was located 7 miles west of
Rawhide Buttes, or 16 miles southwest of Lusk, moving east at 15
mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Jay Em and Rawhide Buttes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
&&
LAT...LON 4250 10477 4267 10475 4269 10426 4237 10434
TIME...MOT...LOC 0100Z 269DEG 14KT 4258 10465
HAIL...1.25IN
WIND...60MPH
$$
Hammer3 follow-up statements
899
WWUS55 KCYS 030116
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
716 PM MDT Fri Jul 2 2021
WYC031-030125-
/O.CAN.KCYS.SV.W.0070.000000T0000Z-210703T0200Z/
Platte WY-
716 PM MDT Fri Jul 2 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PLATTE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4250 10465 4262 10464 4266 10427 4237 10434
TIME...MOT...LOC 0115Z 279DEG 14KT 4255 10457
$$
WYC015-027-030200-
/O.CON.KCYS.SV.W.0070.000000T0000Z-210703T0200Z/
Niobrara WY-Goshen WY-
716 PM MDT Fri Jul 2 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR SOUTH CENTRAL NIOBRARA AND NORTHWESTERN GOSHEN COUNTIES...
At 715 PM MDT, a severe thunderstorm was located near Rawhide Buttes,
or 15 miles south of Lusk, moving east at 15 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...
Jay Em and Rawhide Buttes.
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 4250 10465 4262 10464 4266 10427 4237 10434
TIME...MOT...LOC 0115Z 279DEG 14KT 4255 10457
HAIL...2.00IN
WIND...60MPH
$$
Hammer860
WWUS55 KCYS 030127
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
727 PM MDT Fri Jul 2 2021
WYC027-030137-
/O.CAN.KCYS.SV.W.0070.000000T0000Z-210703T0200Z/
Niobrara WY-
727 PM MDT Fri Jul 2 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NIOBRARA COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4249 10462 4260 10459 4261 10428 4237 10434
TIME...MOT...LOC 0127Z 284DEG 12KT 4252 10451
$$
WYC015-030200-
/O.CON.KCYS.SV.W.0070.000000T0000Z-210703T0200Z/
Goshen WY-
727 PM MDT Fri Jul 2 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR NORTHWESTERN GOSHEN COUNTY...
At 727 PM MDT, a severe thunderstorm was located near Rawhide Buttes,
or 16 miles south of Lusk, moving east at 15 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...
Jay Em and Rawhide Buttes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. 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 4249 10462 4260 10459 4261 10428 4237 10434
TIME...MOT...LOC 0127Z 284DEG 12KT 4252 10451
HAIL...2.75IN
WIND...60MPH
$$
Hammer254
WWUS55 KCYS 030143
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
743 PM MDT Fri Jul 2 2021
WYC015-030200-
/O.CON.KCYS.SV.W.0070.000000T0000Z-210703T0200Z/
Goshen WY-
743 PM MDT Fri Jul 2 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR NORTH CENTRAL GOSHEN COUNTY...
At 743 PM MDT, a severe thunderstorm was located near Jay Em, or 17
miles south of Lusk, moving east at 20 mph.
This is a very dangerous storm.
HAZARD...Baseball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
Locations impacted include...
Jay Em.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Cheyenne.
&&
LAT...LON 4247 10451 4257 10448 4254 10430 4237 10434
TIME...MOT...LOC 0143Z 278DEG 17KT 4251 10439
HAIL...2.75IN
WIND...60MPH
$$
HammerThe 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, 7:05 PM MDT | Special Weather Statement | CYS | Niobrara | 40 min |
| Jul 2, 7:47 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 36 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.