Alert archive / Wyoming / Tornado Warnings in 2023
Tornado Warning 39, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jun 29, 2023, 3:22 PM MDT for Laramie County, Platte County, Wyoming. It was in force for 23 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
- Jun 29, 2023, 3:22 PM MDT (21:22 UTC)
- Expired
- Jun 29, 2023, 3:45 PM MDT
- In force
- 23 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.5 in
Counties Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 44 km from the middle of the area, began a volume at 21:23 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 |
|---|---|---|---|
| Jun 29, 1:17 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 9.4 hours before the alert went out and 329 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
- 51 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 1483 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
580
WFUS55 KCYS 292122
TORCYS
WYC021-031-292145-
/O.NEW.KCYS.TO.W.0039.230629T2122Z-230629T2145Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
322 PM MDT Thu Jun 29 2023
The National Weather Service in Cheyenne has issued a
* Tornado Warning for...
Northwestern Laramie County in southeastern Wyoming...
South central Platte County in southeastern Wyoming...
* Until 345 PM MDT.
* At 322 PM MDT, a severe thunderstorm capable of producing a tornado
was located 8 miles east of Iron Mountain, or 28 miles northwest of
Cheyenne, moving northeast at 20 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This tornadic thunderstorm will remain over mainly rural areas of
northwestern Laramie and south central Platte Counties.
This includes Interstate 25 in Wyoming between mile markers 34 and
44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4145 10505 4155 10514 4171 10494 4148 10472
TIME...MOT...LOC 2122Z 237DEG 17KT 4152 10505
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
Rubin2 follow-up statements
185
WWUS55 KCYS 292132
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
332 PM MDT Thu Jun 29 2023
WYC021-031-292145-
/O.CON.KCYS.TO.W.0039.000000T0000Z-230629T2145Z/
Laramie WY-Platte WY-
332 PM MDT Thu Jun 29 2023
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM MDT FOR
NORTHWESTERN LARAMIE AND SOUTH CENTRAL PLATTE COUNTIES...
At 331 PM MDT, a severe thunderstorm capable of producing a tornado
was located 11 miles east of Iron Mountain, or 29 miles north of
Cheyenne, moving northeast at 20 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
northwestern Laramie and south central Platte Counties.
This includes Interstate 25 in Wyoming between mile markers 34 and
44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.
&&
LAT...LON 4145 10500 4159 10509 4171 10494 4148 10472
TIME...MOT...LOC 2131Z 237DEG 17KT 4155 10500
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
Rubin368
WWUS55 KCYS 292144
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
344 PM MDT Thu Jun 29 2023
WYC021-031-292151-
/O.EXP.KCYS.TO.W.0039.000000T0000Z-230629T2145Z/
Laramie WY-Platte WY-
344 PM MDT Thu Jun 29 2023
...THE TORNADO WARNING FOR NORTHWESTERN LARAMIE AND SOUTH CENTRAL
PLATTE COUNTIES WILL EXPIRE AT 345 PM MDT...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and
a Severe Thunderstorm Warning remains in effect for northwestern
Laramie County and Southeastern Platte County until 415 PM MDT.
A Tornado Watch remains in effect until 900 PM MDT for southeastern
Wyoming.
LAT...LON 4145 10500 4159 10509 4171 10494 4148 10472
TIME...MOT...LOC 2141Z 237DEG 17KT 4157 10495
$$
RubinThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 6:20 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 40 min |
| Jun 28, 6:46 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 59 min |
| Jun 28, 7:17 PM MDT | Special Weather Statement | CYS | Laramie | 43 min |
| Jun 28, 7:47 PM MDT | Special Weather Statement | CYS | Converse | 58 min |
| Jun 28, 8:15 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 45 min |
| Jun 28, 8:18 PM MDT | Special Weather Statement | CYS | Albany | 42 min |
| Jun 29, 12:16 PM MDT | Special Weather Statement | CYS | Converse | 44 min |
| Jun 29, 12:56 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 52 min |
| Jun 29, 1:35 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Platte | 40 min |
| Jun 29, 1:59 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 46 min |
| Jun 29, 2:02 PM MDT | Special Weather Statement | CYS | Platte | 43 min |
| Jun 29, 2:12 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Laramie, Platte | 63 min |
| Jun 29, 2:13 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Platte | 47 min |
| Jun 29, 2:27 PM MDT | Special Weather Statement | CYS | Albany | 48 min |
| Jun 29, 2:41 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 49 min |
| Jun 29, 2:55 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 50 min |
| Jun 29, 2:56 PM MDT | Flash Flood Warning | CYS | Converse | 3 hr |
| Jun 29, 3:11 PM MDT | Severe Thunderstorm Warning | CYS | Laramie, Platte | 64 min |
| Jun 29, 3:16 PM MDT | Special Weather Statement | CYS | Albany | 44 min |
| Jun 29, 3:16 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 29 min |
| Jun 29, 3:21 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 24 min |
| Jun 29, 3:44 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 46 min |
| Jun 29, 3:54 PM MDT | Special Weather Statement | CYS | Carbon | 51 min |
| Jun 29, 4:01 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 74 min |
| Jun 29, 4:04 PM MDT | Flash Flood Warning | CYS | Niobrara | 91 min |
| Jun 29, 4:28 PM MDT | Special Weather Statement | CYS | Goshen | 32 min |
| Jun 29, 4:44 PM MDT | Special Weather Statement | CYS | Goshen | 31 min |
| Jun 29, 5:04 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 71 min |
| Jun 29, 5:30 PM MDT | Areal Flood Advisory | CYS | Goshen, Laramie | 3 hr |
| Jun 29, 5:52 PM MDT | Special Weather Statement | CYS | Laramie | 38 min |
| Jun 29, 5:57 PM MDT | Special Weather Statement | CYS | Albany | 48 min |
Nearby
Tornado Warnings in Wyoming, 2023Every tornado warning in 2023Tornadoes in 2023
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.