Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 249, NWS Cheyenne, WY

July 22, 2025Converse County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 22, 2025, 10:23 PM MDT for Converse County, Wyoming. It was in force for 37 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 22, 2025, 10:23 PM MDT (04:23 UTC)
Expired: Jul 22, 2025, 11:00 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Converse County, WY

The radar

The Cheyenne radar (KCYS), 210 km from the middle of the area, began a volume at 04:22 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

Rapid City, SD (KUNR), launched 00:00Z, 4.4 hours before the alert went out and 244 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1254 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

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 22, 5:15 PM MDT, 5 hours 8 minutes earlier.

Area forecast discussion, Jul 22, 5:15 PM MDT, 5 hours 8 minutes before

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Hazardous weather outlook, Jul 22, 4:06 PM MDT, 6 hours 17 minutes before

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In the hours before

Special weather statement, Jul 22, 5:23 PM MDT, 5 hours before

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Special weather statement, Jul 22, 6:05 PM MDT, 4 hours 18 minutes before

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Special weather statement, Jul 22, 6:23 PM MDT, 4 hours before

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Special weather statement, Jul 22, 6:45 PM MDT, 3 hours 38 minutes before

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Special weather statement, Jul 22, 6:57 PM MDT, 3 hours 26 minutes before

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Special weather statement, Jul 22, 10:07 PM MDT, 16 minutes before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 10:07 PM MDT	Special Weather Statement	CYS	Niobrara	38 min
Jul 22, 10:53 PM MDT	Special Weather Statement	CYS	Niobrara	52 min
Jul 23, 2:44 PM MDT	Special Weather Statement	CYS	Albany	31 min
Jul 23, 3:06 PM MDT	Severe Thunderstorm Warning	CYS	Converse	39 min
Jul 23, 3:17 PM MDT	Special Weather Statement	CYS	Albany	28 min
Jul 23, 3:45 PM MDT	Special Weather Statement	CYS	Laramie	30 min
Jul 23, 4:25 PM MDT	Special Weather Statement	CYS	Laramie	50 min
Jul 23, 4:37 PM MDT	Special Weather Statement	CYS	Laramie	23 min
Jul 23, 4:57 PM MDT	Special Weather Statement	CYS	Niobrara	48 min
Jul 23, 5:06 PM MDT	Flash Flood Warning	CYS	Laramie	77 min
Jul 23, 5:33 PM MDT	Areal Flood Advisory	CYS	Laramie	94 min
Jul 23, 5:51 PM MDT	Special Weather Statement	CYS	Goshen	39 min
Jul 22, 6:05 PM MDT	Special Weather Statement	CYS	Box Butte	25 min
Jul 22, 6:23 PM MDT	Special Weather Statement	CYS	Cheyenne	37 min
Jul 22, 6:45 PM MDT	Special Weather Statement	CYS	Box Butte	30 min
Jul 22, 6:57 PM MDT	Special Weather Statement	CYS	Cheyenne	33 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2025 Every severe thunderstorm warning in 2025

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.