Alert archive / Wyoming / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 259, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 16, 2026, 8:20 PM MDT for Goshen County, Laramie County, Platte County, Wyoming. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 16, 2026, 8:20 PM MDT (02:20 UTC)
- Expired
- Aug 16, 2026, 9:00 PM MDT
- In force
- 40 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Goshen County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 78 km from the middle of the area, began a volume at 02:23 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 |
|---|---|---|---|
| Aug 16, 2:06 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.3 hours before the alert went out and 348 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
- 334 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1497 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 6:00 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 45 min |
| Aug 16, 8:11 PM MDT | Special Weather Statement | CYS | Laramie | 34 min |
| Aug 16, 8:56 PM MDT | Special Weather Statement | CYS | Laramie | 34 min |
| Aug 17, 2:45 PM MDT | Special Weather Statement | CYS | Niobrara | 30 min |
| Aug 17, 4:39 PM MDT | Special Weather Statement | CYS | Niobrara | 51 min |
| Aug 16, 6:11 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill | 49 min |
| Aug 16, 6:34 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Morrill, Scotts Bluff | 41 min |
| Aug 16, 6:55 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 50 min |
| Aug 16, 7:08 PM MDT | Areal Flood Advisory | CYS | Banner, Cheyenne, Morrill | 3 hr |
| Aug 16, 7:11 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Morrill, Scotts Bluff | 49 min |
| Aug 16, 7:21 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball | 39 min |
| Aug 16, 7:43 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Morrill | 14 min |
| Aug 16, 7:55 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 17 min |
| Aug 17, 3:08 PM MDT | Special Weather Statement | CYS | Sioux | 37 min |
| Aug 17, 3:46 PM MDT | Special Weather Statement | CYS | Box Butte | 44 min |
| Aug 17, 4:18 PM MDT | Severe Thunderstorm Warning | CYS | Dawes, Sioux | 42 min |
| Aug 17, 4:26 PM MDT | Special Weather Statement | CYS | Box Butte | 34 min |
| Aug 17, 4:34 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 41 min |
| Aug 17, 4:46 PM MDT | Special Weather Statement | CYS | Dawes | 44 min |
| Aug 17, 4:53 PM MDT | Special Weather Statement | CYS | Dawes | 37 min |
| Aug 17, 5:31 PM MDT | Special Weather Statement | CYS | Dawes | 29 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2026Every severe thunderstorm warning in 2026
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.