Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 32, NWS Cheyenne, WY

May 26, 2023Converse County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 26, 2023, 6:28 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 47 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: May 26, 2023, 6:28 PM MDT (00:28 UTC)
Expired: May 26, 2023, 7:15 PM MDT
In force: 47 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Converse County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 208 km from the middle of the area, began a volume at 00:31 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 26, 1:33 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.5 hours before the alert went out and 419 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: 349 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 293 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 May 26, 5:29 PM MDT, 59 minutes earlier.

Area forecast discussion, May 26, 5:29 PM MDT, 59 minutes before

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Hazardous weather outlook, May 26, 2:16 PM MDT, 4 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
216 PM MDT Fri May 26 2023

NEZ002-003-019>021-054-055-095-096-WYZ101>119-272030-
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-
216 PM MDT Fri May 26 2023

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

Scattered to numerous showers and thunderstorms are likely again
this afternoon. Some storms may be capable of producing damaging
winds and/or large hail. An isolated tornado cannot be ruled out.
Heavy rain is also expected with these storms.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Daily chances for showers and thunderstorms continue through the
weekend. Gusty winds, heavy rainfall, and large hail are possible
with storms on Saturday. Storm coverage may decrease somewhat for
Sunday through Tuesday, then possibly increase again midweek.

.Spotter information statement...

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

In the hours before

Special weather statement, May 26, 4:49 PM MDT, 1 hour 39 minutes before

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Local storm report, May 26, 5:04 PM MDT, 1 hour 24 minutes before

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Local storm report, May 26, 5:08 PM MDT, 1 hour 20 minutes before

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Special weather statement, May 26, 5:09 PM MDT, 1 hour 19 minutes before

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Special weather statement, May 26, 5:37 PM MDT, 51 minutes before

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Special weather statement, May 26, 6:08 PM MDT, 20 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
May 26, 6:08 PM MDT	Special Weather Statement	CYS	Converse	67 min
May 26, 6:37 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	53 min
May 26, 6:57 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	35 min
May 26, 8:17 PM MDT	Special Weather Statement	CYS	Niobrara	28 min
May 27, 1:02 PM MDT	Special Weather Statement	CYS	Converse	43 min
May 27, 1:17 PM MDT	Special Weather Statement	CYS	Platte	28 min
May 27, 1:56 PM MDT	Special Weather Statement	CYS	Converse	34 min
May 27, 2:16 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	59 min
May 27, 2:22 PM MDT	Tornado Warning Tornado observed	CYS	Albany, Converse, Platte	38 min
May 27, 2:28 PM MDT	Tornado Warning	CYS	Converse	32 min
May 27, 2:32 PM MDT	Severe Thunderstorm Warning	CYS	Platte	43 min
May 27, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Platte	49 min
May 27, 3:15 PM MDT	Severe Thunderstorm Warning	CYS	Converse	45 min
May 27, 3:56 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	64 min
May 27, 4:04 PM MDT	Tornado Warning Tornado observed	CYS	Laramie	26 min
May 27, 4:32 PM MDT	Tornado Warning	CYS	Laramie	28 min
May 27, 4:39 PM MDT	Special Weather Statement	CYS	Goshen	36 min
May 27, 4:50 PM MDT	Tornado Warning	CYS	Laramie	40 min
May 27, 4:54 PM MDT	Special Weather Statement	CYS	Goshen	36 min
May 27, 5:07 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	38 min
May 27, 5:09 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	51 min
May 27, 5:14 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	46 min
May 27, 5:21 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	54 min
May 27, 5:32 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	43 min
May 27, 5:38 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	52 min
May 27, 5:59 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	31 min
May 27, 3:19 PM MDT	Special Weather Statement	CYS	Kimball	26 min
May 27, 3:43 PM MDT	Special Weather Statement	CYS	Kimball	32 min
May 27, 4:14 PM MDT	Special Weather Statement	CYS	Kimball	31 min
May 27, 4:45 PM MDT	Special Weather Statement	CYS	Banner	30 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2023 Every severe thunderstorm warning in 2023

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.