Alert archive / Wyoming / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 104, NWS Cheyenne, WY

July 17, 2024Goshen County, Wyoming; Scotts Bluff County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 17, 2024, 2:33 PM MDT for Goshen County, Wyoming; Scotts Bluff County, Nebraska. It was in force for 27 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 17, 2024, 2:33 PM MDT (20:33 UTC)
Expired: Jul 17, 2024, 3:00 PM MDT
In force: 27 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Scotts Bluff County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 20:35 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 12:00Z, 8.6 hours before the alert went out and 252 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: 716 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 17, 2:32 PM MDT, 1 minute earlier.

Area forecast discussion, Jul 17, 2:32 PM MDT, 1 minute before

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Hazardous weather outlook, Jul 17, 8:25 AM MDT, 6 hours 8 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
Issued by National Weather Service Riverton WY
825 AM MDT Wed Jul 17 2024

NEZ002-003-019>021-054-055-095-096-WYZ101>119-181430-
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-
825 AM MDT Wed Jul 17 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

Increasing moisture today will support strong to briefly severe
thunderstorms through this evening. Additionally, heavy rainfall
could lead to localized flash flooding.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Severe potential late in the week, followed by cooler weather for
the weekend. Warm-up begins to start the week.

.Spotter information statement...

Spotters are encouraged to report severe weather to the National
Weather Service in Cheyenne.

In the hours before

Special weather statement, Jul 17, 1:05 PM MDT, 1 hour 28 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
105 PM MDT Wed Jul 17 2024

WYZ118-171930-
Central Laramie County WY-
105 PM MDT Wed Jul 17 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL LARAMIE COUNTY
THROUGH 130 PM MDT...

At 105 PM MDT, Doppler radar was tracking a strong thunderstorm near
Ranchettes, or near Cheyenne, moving southeast at 15 mph.

HAZARD...Nickel size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vegetation is possible.

Locations impacted include...
Laramie County Fairgrounds at Archer and Ranchettes.

This includes Interstate 80 in Wyoming between mile markers 369 and
373.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4122 10475 4123 10473 4117 10459 4112 10460
      4112 10467
TIME...MOT...LOC 1905Z 314DEG 12KT 4120 10471

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH

Charnick

Local storm report, Jul 17, 1:22 PM MDT, 1 hour 11 minutes before

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Special weather statement, Jul 17, 1:47 PM MDT, 46 minutes before

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Special weather statement, Jul 17, 1:49 PM MDT, 44 minutes before

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Special weather statement, Jul 17, 2:20 PM MDT, 13 minutes before

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Special weather statement, Jul 17, 2:26 PM MDT, 7 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 17, 12:01 PM MDT	Special Weather Statement	CYS	Niobrara	29 min
Jul 17, 12:05 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	13 min
Jul 17, 12:19 PM MDT	Special Weather Statement	CYS	Niobrara	26 min
Jul 17, 12:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	30 min
Jul 17, 1:02 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	43 min
Jul 17, 1:05 PM MDT	Special Weather Statement	CYS	Laramie	25 min
Jul 17, 1:47 PM MDT	Special Weather Statement	CYS	Goshen	28 min
Jul 17, 2:20 PM MDT	Special Weather Statement	CYS	Goshen	25 min
Jul 17, 2:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	36 min
Jul 17, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	47 min
Jul 17, 3:45 PM MDT	Special Weather Statement	CYS	Niobrara	45 min
Jul 17, 3:52 PM MDT	Special Weather Statement	CYS	Laramie	38 min
Jul 17, 4:13 PM MDT	Flash Flood Warning	CYS	Albany, Laramie	3 hr
Jul 17, 1:00 PM MDT	Special Weather Statement	CYS	Sioux	30 min
Jul 17, 1:09 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	17 min
Jul 17, 1:14 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	31 min
Jul 17, 1:49 PM MDT	Special Weather Statement	CYS	Sioux	26 min
Jul 17, 2:10 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	18 min
Jul 17, 2:26 PM MDT	Special Weather Statement	CYS	Banner	34 min
Jul 17, 2:49 PM MDT	Special Weather Statement	CYS	Morrill	41 min
Jul 17, 3:24 PM MDT	Special Weather Statement	CYS	Dawes	36 min
Jul 17, 4:02 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	28 min
Jul 17, 4:07 PM MDT	Special Weather Statement	CYS	Kimball	38 min
Jul 17, 4:31 PM MDT	Special Weather Statement	CYS	Cheyenne	44 min
Jul 17, 5:01 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Cheyenne	29 min
Jul 17, 5:30 PM MDT	Special Weather Statement	CYS	Cheyenne	45 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2024 Severe Thunderstorm Warnings in Nebraska, 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.