Alert archive / South Dakota / Mesoscale Discussions in 2022

Mesoscale Discussion 942

May 27, 20225 counties in South Dakota; 5 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 27, 2022, 2:52 PM MDT for 5 counties in South Dakota; 5 counties in Wyoming. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 27, 2022, 2:52 PM MDT (20:52 UTC)
Expired
May 27, 2022, 4:15 PM MDT
In force
83 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
40%

Counties Butte County, SD, Custer County, SD, Fall River County, SD, Lawrence County, SD, Pennington County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 177 km from the middle of the area, began a volume at 20:52 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.9 hours before the alert went out and 438 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2022-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2022-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3313 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 27, 4:19 PM MDTSevere Thunderstorm WatchSPCBennett, Butte, Campbell, Corson, Custer, Dewey and 20 more5 hr
May 27, 5:46 PM MDTMesoscale DiscussionSPCBennett, Butte, Corson, Custer, Dewey, Fall River and 13 more119 min

Nearby

Mesoscale Discussions in South Dakota, 2022Mesoscale Discussions in Wyoming, 2022Every mesoscale discussion in 2022

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.