Alert archive / Nebraska / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 291, NWS Cheyenne, WY

August 15, 2025Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 15, 2025, 5:00 PM MDT for Sioux County, Nebraska. It was in force for 45 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 15, 2025, 5:00 PM MDT (23:00 UTC)
Expired: Aug 15, 2025, 5:45 PM MDT
In force: 45 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Sioux County, NE

The radar

The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 23:00 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.

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 Aug 15, 2:20 PM MDT, 2 hours 40 minutes earlier.

Area forecast discussion, Aug 15, 2:20 PM MDT, 2 hours 40 minutes before

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Hazardous weather outlook, Aug 15, 9:59 AM MDT, 7 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
959 AM MDT Fri Aug 15 2025

NEZ002-003-019>021-054-055-095-096-WYZ101>119-161600-
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-
959 AM MDT Fri Aug 15 2025

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

.DAY ONE...TODAY AND TONIGHT
Showers and thunderstorms will affect much of southeast Wyoming
and western Nebraska. A few storms may approach severe limits in
the panhandle around 6pm.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
Another round of showers and thunderstorms are likely on Saturday
with a drying trend through next week.

.Spotter information statement...
Please report any hail or strong wind to the NWS.

In the hours before

Special weather statement, Aug 15, 1:02 PM MDT, 3 hours 58 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
102 PM MDT Fri Aug 15 2025

WYZ116-117-151930-
South Laramie Range WY-South Laramie Range Foothills WY-
102 PM MDT Fri Aug 15 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN ALBANY AND
SOUTHWESTERN LARAMIE COUNTIES THROUGH 130 PM MDT...

At 102 PM MDT, Doppler radar was tracking a strong thunderstorm over
Granite Canon, or 22 miles west of Cheyenne, moving northeast at 20
mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Happy Valley, Federal, Table Mountain Ranches, Willadsen Estates,
Granite Canon, Harriman Heights, Crystal Lake Reservoir, Buford,
Granite Springs Reservoir, Curt Gowdy State Park, Pine Grove Estates,
Granite Springs Retreat, and Cheyenne Pass.

This includes Interstate 80 in Wyoming between mile markers 333 and
355.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4112 10537 4132 10512 4109 10490 4099 10513
      4100 10542
TIME...MOT...LOC 1902Z 235DEG 19KT 4109 10522

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Mose

Special weather statement, Aug 15, 1:46 PM MDT, 3 hours 14 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
146 PM MDT Fri Aug 15 2025

WYZ116>118-152015-
South Laramie Range WY-Central Laramie County WY-
South Laramie Range Foothills WY-
146 PM MDT Fri Aug 15 2025

...STRONG THUNDERSTORMS WILL IMPACT WESTERN LARAMIE COUNTY THROUGH
215 PM MDT...

At 146 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from Federal to Willadsen
Estates. Movement was northeast at 15 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Cheyenne, Happy Valley, Federal, Table Mountain Ranches, Rocking Star
Ranch, Willadsen Estates, Silver Sage Estates, Granite Canon, Warren
AFB, Frontier Park, Whitaker, Cheyenne Regional Airport, Bison
Crossing, Curt Gowdy State Park, and Ranchettes.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 1 and 38.
 Interstate 80 in Wyoming between mile markers 342 and 360.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4130 10519 4159 10482 4100 10483 4100 10519
TIME...MOT...LOC 1946Z 225DEG 11KT 4127 10513 4107 10513

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Fuller

Special weather statement, Aug 15, 2:37 PM MDT, 2 hours 23 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
237 PM MDT Fri Aug 15 2025

WYZ117>119-152115-
Central Laramie County WY-South Laramie Range Foothills WY-
East Laramie County WY-
237 PM MDT Fri Aug 15 2025

...STRONG THUNDERSTORMS WILL IMPACT CENTRAL LARAMIE COUNTY THROUGH
315 PM MDT...

At 237 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles northwest of Whitaker to Cheyenne.
Movement was northeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Cheyenne, Burns, Laramie County Fairgrounds at Archer, Hillsdale,
Ranchettes, Cheyenne Regional Airport, Frontier Park, Whitaker, North
Cheyenne, Fox Farm-College, Warren AFB, and South Greeley Highway.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 12 and 46.
 Interstate 80 in Wyoming between mile markers 362 and 385.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4152 10505 4165 10483 4165 10466 4156 10466
      4156 10460 4114 10435 4111 10482
TIME...MOT...LOC 2037Z 243DEG 16KT 4148 10495 4116 10476

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Fuller

Special weather statement, Aug 15, 4:24 PM MDT, 36 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
424 PM MDT Fri Aug 15 2025

WYZ118-119-152300-
Central Laramie County WY-East Laramie County WY-
424 PM MDT Fri Aug 15 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN LARAMIE COUNTY
THROUGH 500 PM MDT...

At 424 PM MDT, Doppler radar was tracking a strong thunderstorm near
Gun Barrel, or 29 miles northeast of Cheyenne, moving northeast at 10
mph.

HAZARD...Wind gusts up to 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Gun Barrel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4131 10429 4138 10442 4152 10435 4142 10412
TIME...MOT...LOC 2224Z 210DEG 8KT 4138 10432

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

Fuller

Special weather statement, Aug 15, 4:37 PM MDT, 23 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
437 PM MDT Fri Aug 15 2025

NEZ095-152300-
North Sioux NE-
437 PM MDT Fri Aug 15 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN SIOUX COUNTY
THROUGH 500 PM MDT...

At 437 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles west of Montrose, or 25 miles east of Lusk, moving northeast at
10 mph.

HAZARD...Wind gusts up to 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

This storm will remain over mainly rural areas of northwestern Sioux
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4299 10369 4278 10393 4283 10405 4300 10405
      4300 10372
TIME...MOT...LOC 2237Z 210DEG 8KT 4289 10399

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

Fuller

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:00 PM MDT	Special Weather Statement	CYS	Platte	30 min
Aug 14, 7:00 PM MDT	Special Weather Statement	CYS	Niobrara	30 min
Aug 15, 1:02 PM MDT	Special Weather Statement	CYS	Laramie	28 min
Aug 15, 1:46 PM MDT	Special Weather Statement	CYS	Laramie	29 min
Aug 15, 2:37 PM MDT	Special Weather Statement	CYS	Laramie	38 min
Aug 15, 4:24 PM MDT	Special Weather Statement	CYS	Laramie	36 min
Aug 14, 6:35 PM MDT	Special Weather Statement	CYS	Scotts Bluff	25 min
Aug 14, 7:04 PM MDT	Special Weather Statement	CYS	Box Butte, Sioux	26 min
Aug 14, 7:37 PM MDT	Special Weather Statement	CYS	Box Butte	38 min
Aug 14, 7:53 PM MDT	Special Weather Statement	CYS	Cheyenne	37 min
Aug 14, 8:18 PM MDT	Special Weather Statement	CYS	Box Butte	27 min
Aug 14, 8:21 PM MDT	Special Weather Statement	CYS	Cheyenne	39 min
Aug 14, 9:07 PM MDT	Special Weather Statement	CYS	Dawes	23 min
Aug 15, 5:20 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Sioux	40 min
Aug 15, 5:51 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Dawes, Sioux	39 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 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; radar from the NEXRAD Level II archive.