Alert archive / Wyoming / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 95, NWS Cheyenne, WY

July 15, 2024Converse County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 15, 2024, 5:04 PM MDT for Converse County, Wyoming. It was in force for 22 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 15, 2024, 5:04 PM MDT (23:04 UTC)
Expired: Jul 15, 2024, 5:26 PM MDT
In force: 22 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

County Converse County, WY

The radar

The Cheyenne radar (KCYS), 210 km from the middle of the area, began a volume at 23:08 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

Riverton, WY (KRIW), launched 12:00Z, 11.1 hours before the alert went out and 235 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: 7 J/kg
Mixed-layer CIN: -243 J/kg
Mixed-layer LCL: 2296 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 15, 2:33 PM MDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jul 15, 2:33 PM MDT, 2 hours 31 minutes before

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Hazardous weather outlook, Jul 15, 3:26 AM MDT, 13 hours 38 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
326 AM MDT Mon Jul 15 2024

NEZ002-003-019>021-054-055-095-096-WYZ101>119-160930-
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-
326 AM MDT Mon Jul 15 2024

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

.DAY ONE...TODAY AND TONIGHT

Isolated showers and thunderstorms will become scattered to
numerous by this evening. The potential for severe thunderstorms
exists. The primary hazards will lightning, brief heavy rainfall,
and strong wind gusts up to 60mph.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Isolated severe thunderstorms are possible on Tuesday and
Wednesday. Primary hazards will be strong wind gusts to 60mph and
large, damaging hail.

Hot temperatures will make a return to the area by the end of the
week.

.Spotter information statement...

Spotter reports are encouraged today if severe weather is
happening in your area.

BW

In the hours before

Local storm report, Jul 15, 3:53 PM MDT, 1 hour 11 minutes before

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Special weather statement, Jul 15, 4:01 PM MDT, 1 hour 3 minutes before

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Special weather statement, Jul 15, 4:46 PM MDT, 18 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
446 PM MDT Mon Jul 15 2024

NEZ002-003-095-096-152315-
Box Butte NE-Dawes NE-North Sioux NE-South Sioux NE-
446 PM MDT Mon Jul 15 2024

...STRONG THUNDERSTORMS WILL IMPACT NORTHERN BOX BUTTE...SOUTHERN
DAWES AND EAST CENTRAL SIOUX COUNTIES THROUGH 515 PM MDT...

At 445 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from Crawford to 9 miles south of Fort Robinson
State Park to 7 miles east of Agate Fossil Beds National Monument.
Movement was east at 35 mph.

HAZARD...Wind gusts of 50 to 55 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...
Crawford, Hemingford, Roberts Trailhead Campground, Box Butte
Campground, Soldier Creek Campground, Box Butte Reservoir, Fort
Robinson State Park, Box Butte County Fairgrounds, Berea, Flahertys
Corner, Agate Fossil Beds National Monument, Marsland, Belmont, and
Box Butte Dam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4215 10304 4244 10378 4273 10359 4265 10278
      4245 10277 4244 10275 4232 10275
TIME...MOT...LOC 2245Z 286DEG 32KT 4267 10341 4252 10344 4243 10364

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

Hammer

Special weather statement, Jul 15, 5:02 PM MDT, 2 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
502 PM MDT Mon Jul 15 2024

WYZ101-103-152345-
Converse County Lower Elevations WY-North Laramie Range WY-
502 PM MDT Mon Jul 15 2024

...STRONG THUNDERSTORMS WILL IMPACT CONVERSE COUNTY THROUGH 545 PM
MDT...

At 502 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from Red Wall to near Evansville
to near Orin. Movement was east at 25 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Douglas, Glenrock, Rolling Hills, Orin, Laprele Reservoir, Deer
Creek, Converse County Airport, Boxelder, Bill, Fort Fetterman
Historic Site, and Shawnee.

This includes Interstate 25 in Wyoming between mile markers 125 and
175.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4266 10496 4254 10608 4350 10607 4350 10511
TIME...MOT...LOC 2302Z 254DEG 24KT 4338 10688 4288 10621 4272 10522

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 3:32 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	26 min
Jul 15, 4:01 PM MDT	Special Weather Statement	CYS	Laramie	44 min
Jul 15, 5:02 PM MDT	Special Weather Statement	CYS	Converse	43 min
Jul 15, 4:46 PM MDT	Special Weather Statement	CYS	Box Butte, Sioux	29 min
Jul 15, 5:20 PM MDT	Special Weather Statement	CYS	Box Butte	40 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2024 Every 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.