Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 5, 2021, 7:53 PM MDT for Goshen County, Niobrara County, Wyoming; Sioux County, Nebraska. It was in force for 22 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
- Jun 5, 2021, 7:53 PM MDT (01:53 UTC)
- Expired
- Jun 5, 2021, 8:15 PM MDT
- In force
- 22 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Sioux County, NE, Goshen County, WY, Niobrara County, WY
The radar
The Cheyenne radar (KCYS), 169 km from the middle of the area, began a volume at 01:57 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 |
|---|---|---|---|
| Jun 5, 7:55 PM MDT | TSTM WND GST 55 | 8 Sse Lusk, WY | 30 MPH SUSTAINED GUSTS TO 55 MPH. |
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, 1.9 hours before the alert went out and 197 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
- 1645 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 2622 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
296 WUUS55 KCYS 060153 SVRCYS NEC165-WYC015-027-060215- /O.NEW.KCYS.SV.W.0030.210606T0153Z-210606T0215Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Cheyenne WY 753 PM MDT Sat Jun 5 2021 The National Weather Service in Cheyenne has issued a * Severe Thunderstorm Warning for... Northwestern Sioux County in the Panhandle of Nebraska... Southeastern Niobrara County in east central Wyoming... North central Goshen County in southeastern Wyoming... * Until 815 PM MDT. * At 752 PM MDT, a severe thunderstorm was located 8 miles northwest of Prairie Center, or 12 miles southeast of Lusk, moving northeast at 35 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Van Tassell. 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. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4249 10437 4262 10447 4286 10407 4262 10405 TIME...MOT...LOC 0152Z 239DEG 32KT 4260 10433 HAIL...0.88IN WIND...60MPH $$ Claycomb
2 follow-up statements
188 WWUS55 KCYS 060207 SVSCYS Severe Weather Statement National Weather Service Cheyenne WY 807 PM MDT Sat Jun 5 2021 NEC165-WYC015-027-060215- /O.CON.KCYS.SV.W.0030.000000T0000Z-210606T0215Z/ Sioux NE-Niobrara WY-Goshen WY- 807 PM MDT Sat Jun 5 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MDT FOR NORTHWESTERN SIOUX...SOUTHEASTERN NIOBRARA AND NORTH CENTRAL GOSHEN COUNTIES... At 807 PM MDT, a severe thunderstorm was located 11 miles north of Prairie Center, or 15 miles southeast of Lusk, moving northeast at 35 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Van Tassell. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. To report severe weather contact your nearest law enforcement agency. They will send your report to the National Weather Service office in Cheyenne. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4254 10430 4264 10436 4286 10407 4262 10405 TIME...MOT...LOC 0207Z 239DEG 32KT 4267 10417 HAIL...0.88IN WIND...60MPH $$ Claycomb
610
WWUS55 KCYS 060212
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
812 PM MDT Sat Jun 5 2021
NEC165-WYC015-027-060220-
/O.EXP.KCYS.SV.W.0030.000000T0000Z-210606T0215Z/
Sioux NE-Niobrara WY-Goshen WY-
812 PM MDT Sat Jun 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SIOUX...
SOUTHEASTERN NIOBRARA AND NORTH CENTRAL GOSHEN COUNTIES WILL EXPIRE
AT 815 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 4254 10430 4264 10436 4286 10407 4262 10405
TIME...MOT...LOC 0210Z 239DEG 32KT 4267 10417
$$
ClaycombThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 7:16 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 28 min |
| Jun 6, 3:24 PM MDT | Special Weather Statement | CYS | Laramie | 36 min |
| Jun 6, 5:21 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 39 min |
| Jun 6, 5:32 PM MDT | Severe Thunderstorm Warning | CYS | Laramie, Platte | 43 min |
| Jun 6, 5:02 PM MDT | Special Weather Statement | CYS | Kimball | 43 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.