Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 21, NWS Rapid City, SD

May 23, 2023Crook County, Wyoming

NWS Rapid City, SD issued this severe thunderstorm warning at May 23, 2023, 4:51 PM MDT for Crook County, Wyoming. It was in force for 54 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 23, 2023, 4:51 PM MDT (22:51 UTC)
Expired: May 23, 2023, 5:45 PM MDT
In force: 54 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Crook County, WY

The radar

The Rapid City radar (KUDX), 148 km from the middle of the area, began a volume at 22:51 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.9 hours before the alert went out and 386 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: 260 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1439 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at May 23, 2:16 PM MDT, 2 hours 35 minutes earlier.

Area forecast discussion, May 23, 2:16 PM MDT, 2 hours 35 minutes before

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Hazardous weather outlook, May 23, 3:46 PM MDT, 1 hour 5 minutes before

Hazardous Weather Outlook
National Weather Service Rapid City SD
346 PM MDT Tue May 23 2023

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-241300-
Harding-Perkins-Butte-Northern Meade Co Plains-Ziebach-
Northern Black Hills-Northern Foot Hills-Rapid City-
Southern Foot Hills-Central Black Hills-Southern Black Hills-
Custer Co Plains-Pennington Co Plains-Haakon-Fall River-
Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Hermosa Foot Hills-Northern Campbell-Southern Campbell-
Western Crook-Wyoming Black Hills-Weston-Northeastern Crook-
346 PM MDT Tue May 23 2023 /446 PM CDT Tue May 23 2023/

This Hazardous Weather Outlook is for portions of western South
Dakota and northeastern Wyoming.

.DAY ONE...This Afternoon and Tonight

Isolated to scattered thunderstorms are expected through this
evening, mainly over northeastern Wyoming and far western to
northwestern South Dakota. The chance for severe thunderstorms is
very low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Daily chances for thunderstorms will continue through the
Memorial Day weekend. Organized severe thunderstorms are not
expected at this time, but isolated severe thunderstorms become
possible by the end of the week into the weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

In the hours before

Special weather statement, May 23, 4:38 PM MDT, 13 minutes before

Special Weather Statement
National Weather Service Rapid City SD
438 PM MDT Tue May 23 2023

WYZ055-232330-
Southern Campbell WY-
438 PM MDT Tue May 23 2023

...A strong thunderstorm will impact portions of southeastern
Campbell County through 530 PM MDT...

At 437 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles southeast of Wright. This storm was moving northwest at 5 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Wright.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4374 10517 4356 10532 4364 10563 4386 10545
TIME...MOT...LOC 2237Z 120DEG 3KT 4368 10535

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

Calderon

Special weather statement, May 23, 4:43 PM MDT, 8 minutes before

Special Weather Statement
National Weather Service Rapid City SD
443 PM MDT Tue May 23 2023

WYZ056-057-232330-
Wyoming Black Hills WY-Western Crook WY-
443 PM MDT Tue May 23 2023

...A strong thunderstorm will impact portions of southwestern Crook
County through 530 PM MDT...

At 443 PM MDT, Doppler radar was tracking a strong thunderstorm 4
miles south of Devils Tower Junction, or 16 miles west of Sundance.
This storm was nearly stationary.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Carlile, Devils Tower Junction and Devils Tower National Monument.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large quantities of hail. Driving through
deep hail is like driving on slushy roads. Slow down and do not brake
suddenly.

&&

LAT...LON 4451 10452 4436 10465 4443 10494 4467 10475
TIME...MOT...LOC 2243Z 120DEG 3KT 4445 10471

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Calderon

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 6:27 PM MDT	Special Weather Statement	UNR	Crook	48 min
May 23, 4:38 PM MDT	Special Weather Statement	UNR	Campbell	52 min
May 23, 4:43 PM MDT	Special Weather Statement	UNR	Crook	47 min
May 23, 5:57 PM MDT	Special Weather Statement	UNR	Crook	48 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.