Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 69, NWS Cheyenne, WY

June 12, 2025Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 12, 2025, 7:08 PM MDT for Niobrara County, Wyoming. It was in force for 52 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: Jun 12, 2025, 7:08 PM MDT (01:08 UTC)
Expired: Jun 12, 2025, 8:00 PM MDT
In force: 52 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Damage threat: Considerable
Hail: 2.0 in
Wind: 60.0 mph

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 178 km from the middle of the area, began a volume at 01:09 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, 1.1 hours before the alert went out and 171 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: 80 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

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 Jun 12, 5:34 PM MDT, 1 hour 34 minutes earlier.

Area forecast discussion, Jun 12, 5:34 PM MDT, 1 hour 34 minutes before

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Hazardous weather outlook, Jun 12, 1:59 PM MDT, 5 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
159 PM MDT Thu Jun 12 2025

NEZ002-003-019>021-054-055-095-096-WYZ101>119-132000-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
159 PM MDT Thu Jun 12 2025

This hazardous weather outlook is for portions of panhandle
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.

.DAY ONE...THIS AFTERNOON AND TONIGHT

- Strong to severe storms possible Thursday and Friday. All
  hazards of severe weather are possible, including large hail,
  damaging winds, an isolated tornado, and heavy rain.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

- Above average temperatures are expected to persist through the
  upcoming weekend.

- Active weather expected this weekend through much of next
  week as a messy upper-level pattern takes hold of the region.

.Spotter information statement...

Spotters are encouraged to report severe weather to the NWS.

In the hours before

Local storm report, Jun 12, 5:26 PM MDT, 1 hour 42 minutes before

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Local storm report, Jun 12, 6:12 PM MDT, 56 minutes before

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Local storm report, Jun 12, 6:19 PM MDT, 49 minutes before

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Local storm report, Jun 12, 6:44 PM MDT, 24 minutes before

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Local storm report, Jun 12, 6:49 PM MDT, 19 minutes before

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Special weather statement, Jun 12, 6:54 PM MDT, 14 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
Jun 12, 6:05 PM MDT	Severe Thunderstorm Warning	CYS	Albany	40 min
Jun 12, 6:29 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	46 min
Jun 12, 6:31 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	30 min
Jun 12, 7:57 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Niobrara	33 min
Jun 13, 12:52 PM MDT	Special Weather Statement	CYS	Laramie	53 min
Jun 13, 12:55 PM MDT	Special Weather Statement	CYS	Albany	50 min
Jun 13, 1:48 PM MDT	Special Weather Statement	CYS		42 min
Jun 13, 2:32 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	43 min
Jun 13, 2:38 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse	37 min
Jun 13, 3:05 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	55 min
Jun 13, 3:28 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	47 min
Jun 13, 3:59 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Niobrara, Platte	28 min
Jun 13, 4:09 PM MDT	Severe Thunderstorm Warning	CYS	Converse	51 min
Jun 13, 4:43 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	47 min
Jun 13, 4:48 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	72 min
Jun 12, 6:32 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	43 min
Jun 12, 6:54 PM MDT	Special Weather Statement	CYS	Box Butte	36 min
Jun 13, 4:22 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	53 min
Jun 13, 5:00 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Box Butte, Morrill, Scotts Bluff	45 min
Jun 13, 5:16 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Morrill, Scotts Bluff, Sioux	59 min
Jun 13, 5:44 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	61 min
Jun 13, 5:51 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball, Morrill	54 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.