Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 97, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 9, 2021, 10:19 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 41 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
- Jul 9, 2021, 10:19 PM MDT (04:19 UTC)
- Expired
- Jul 9, 2021, 11:00 PM MDT
- In force
- 41 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Goshen County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 83 km from the middle of the area, began a volume at 04:19 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 9, 2:16 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 4.3 hours before the alert went out and 266 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
- 807 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 3619 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
547
WUUS55 KCYS 100419
SVRCYS
WYC015-031-100500-
/O.NEW.KCYS.SV.W.0097.210710T0419Z-210710T0500Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
1019 PM MDT Fri Jul 9 2021
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
Southwestern Goshen County in southeastern Wyoming...
Southern Platte County in southeastern Wyoming...
* Until 1100 PM MDT.
* At 1018 PM MDT, severe thunderstorms were located along a line
extending from near Lakeview North to 6 miles west of Westview
Circle, moving southeast at 35 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...
Wheatland, Chugwater, Chugcreek, Lakeview North, Bordeaux, Westview
Circle, Y-O Ranch, Grayrocks Reservoir and Slater.
This includes Interstate 25 in Wyoming between mile markers 53 and
88.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4167 10508 4211 10524 4223 10479 4181 10440
TIME...MOT...LOC 0418Z 332DEG 31KT 4213 10487 4206 10519
HAIL...1.00IN
WIND...60MPH
$$
Brothers2 follow-up statements
523
WWUS55 KCYS 100430
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
1030 PM MDT Fri Jul 9 2021
WYC015-031-100500-
/O.CON.KCYS.SV.W.0097.000000T0000Z-210710T0500Z/
Goshen WY-Platte WY-
1030 PM MDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM MDT
FOR SOUTHWESTERN GOSHEN AND SOUTHERN PLATTE COUNTIES...
At 1029 PM MDT, severe thunderstorms were located along a line
extending from 7 miles east of Chugcreek to 7 miles west of Bordeaux,
moving southeast at 40 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Wheatland, Chugwater, Chugcreek, Lakeview North, Bordeaux, Westview
Circle, Y-O Ranch, Grayrocks Reservoir and Slater.
This includes Interstate 25 in Wyoming between mile markers 53 and
84.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4167 10508 4208 10520 4218 10474 4181 10440
TIME...MOT...LOC 0429Z 329DEG 37KT 4202 10478 4195 10510
HAIL...1.50IN
WIND...60MPH
$$
Brothers549
WWUS55 KCYS 100459
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
1059 PM MDT Fri Jul 9 2021
WYC015-031-100508-
/O.EXP.KCYS.SV.W.0097.000000T0000Z-210710T0500Z/
Goshen WY-Platte WY-
1059 PM MDT Fri Jul 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GOSHEN AND
SOUTHERN PLATTE COUNTIES WILL EXPIRE AT 1100 PM MDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire. However small hail and gusty winds are still
possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
southeastern Wyoming.
LAT...LON 4167 10508 4208 10520 4218 10474 4181 10440
TIME...MOT...LOC 0458Z 332DEG 31KT 4181 10463 4174 10495
$$
BrothersThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 7:25 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 50 min |
| Jul 9, 8:04 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 41 min |
| Jul 9, 8:31 PM MDT | Tornado Warning | CYS | Niobrara | 44 min |
| Jul 9, 9:47 PM MDT | Special Weather Statement | CYS | Platte | 28 min |
| Jul 9, 10:58 PM MDT | Special Weather Statement | CYS | Goshen | 32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.