Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 10, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 23, 2021, 1:35 PM MDT for Goshen County, Platte County, Wyoming. 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 23, 2021, 1:35 PM MDT (19:35 UTC)
- Expired
- May 23, 2021, 2:04 PM MDT
- In force
- 29 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), 129 km from the middle of the area, began a volume at 19:39 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 |
|---|---|---|---|
| May 23, 12:06 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 7.6 hours before the alert went out and 248 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
- 549 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 271 m²/s²
- 0-3 km storm-relative helicity
- 339 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
048
WUUS55 KCYS 231935
SVRCYS
WYC015-031-232015-
/O.NEW.KCYS.SV.W.0010.210523T1935Z-210523T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
135 PM MDT Sun May 23 2021
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
Northwestern Goshen County in southeastern Wyoming...
Northeastern Platte County in southeastern Wyoming...
* Until 215 PM MDT.
* At 134 PM MDT, a severe thunderstorm was located near Guernsey
Campground, or 17 miles northeast of Wheatland, moving north at 20
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...
Guernsey, Guernsey Campground and Hartville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM MDT for southeastern
Wyoming.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4217 10472 4223 10495 4254 10486 4245 10452
TIME...MOT...LOC 1934Z 199DEG 17KT 4228 10481
HAIL...1.00IN
WIND...60MPH
$$
Cox2 follow-up statements
338
WWUS55 KCYS 231948
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
148 PM MDT Sun May 23 2021
WYC015-031-232015-
/O.CON.KCYS.SV.W.0010.000000T0000Z-210523T2015Z/
Goshen WY-Platte WY-
148 PM MDT Sun May 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM MDT
FOR NORTHWESTERN GOSHEN AND NORTHEASTERN PLATTE COUNTIES...
At 148 PM MDT, a severe thunderstorm was located 8 miles north of
Guernsey Campground, or 27 miles southwest of Lusk, moving north at
25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Guernsey Campground and Hartville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM MDT for southeastern
Wyoming.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4228 10467 4233 10492 4254 10486 4245 10452
TIME...MOT...LOC 1948Z 197DEG 23KT 4244 10475
HAIL...1.00IN
WIND...60MPH
$$
Cox870
WWUS55 KCYS 232004
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
204 PM MDT Sun May 23 2021
WYC015-031-232014-
/O.CAN.KCYS.SV.W.0010.000000T0000Z-210523T2015Z/
Goshen WY-Platte WY-
204 PM MDT Sun May 23 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GOSHEN AND
NORTHEASTERN PLATTE COUNTIES IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However heavy rain is
still possible with this thunderstorm.
A Tornado Watch remains in effect until 800 PM MDT for southeastern
Wyoming.
LAT...LON 4228 10467 4233 10492 4254 10486 4245 10452
TIME...MOT...LOC 2002Z 199DEG 17KT 4251 10472
$$
CoxThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 12:54 AM MDT | Dense Fog Advisory | CYS | Albany, Laramie | 7 hr |
| May 23, 2:04 AM MDT | High Wind Warning | CYS | Albany, Carbon | 18 hr |
| May 23, 1:18 PM MDT | Special Weather Statement | CYS | Laramie | 42 min |
| May 23, 1:28 PM MDT | Special Weather Statement | CYS | Platte | 47 min |
| May 23, 1:59 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 19 min |
| May 23, 2:03 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 42 min |
| May 23, 2:38 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 24 min |
| May 23, 3:22 PM MDT | Areal Flood Advisory | CYS | Laramie | 3 hr |
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.