Alert archive / Wyoming / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 129, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 21, 2024, 1:52 PM MDT for Goshen County, Wyoming; Sioux County, Nebraska. 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 counties it named.
The facts
- Issued
- Jul 21, 2024, 1:52 PM MDT (19:52 UTC)
- Expired
- Jul 21, 2024, 2:15 PM MDT
- In force
- 23 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Sioux County, NE, Goshen County, WY
The radar
The Cheyenne radar (KCYS), 141 km from the middle of the area, began a volume at 19:53 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 nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.9 hours before the alert went out and 314 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
- 118 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 5:30 PM MDT, 20 hours 22 minutes earlier.
Area forecast discussion, Jul 20, 5:30 PM MDT, 20 hours 22 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 11:54 AM MDT | Areal Flood Advisory | CYS | Niobrara | 111 min |
| Jul 21, 1:44 PM MDT | Special Weather Statement | CYS | Goshen | 46 min |
| Jul 21, 4:37 PM MDT | Special Weather Statement | CYS | Laramie | 53 min |
| Jul 21, 4:39 PM MDT | Special Weather Statement | CYS | Laramie | 51 min |
| Jul 21, 5:40 PM MDT | Special Weather Statement | CYS | Laramie | 50 min |
| Jul 21, 5:57 PM MDT | Areal Flood Advisory | CYS | Laramie | 3 hr |
| Jul 21, 12:08 PM MDT | Special Weather Statement | CYS | Scotts Bluff | 52 min |
| Jul 21, 12:28 PM MDT | Areal Flood Advisory | CYS | Sioux | 2 hr |
| Jul 21, 1:42 PM MDT | Special Weather Statement | CYS | Kimball | 48 min |
| Jul 21, 3:25 PM MDT | Special Weather Statement | CYS | Cheyenne | 50 min |
| Jul 21, 4:21 PM MDT | Special Weather Statement | CYS | Box Butte | 39 min |
| Jul 21, 5:06 PM MDT | Special Weather Statement | CYS | Sioux | 39 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2024Severe Thunderstorm Warnings in Nebraska, 2024Every severe thunderstorm warning in 2024
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.