Alert archive / South Dakota / Mesoscale Discussions in 2022

Mesoscale Discussion 730

May 11, 2022Boyd County, Keya Paha County, Rock County, Nebraska; 24 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 11, 2022, 11:50 PM CDT for Boyd County, Keya Paha County, Rock County, Nebraska; 24 counties in South Dakota. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 11, 2022, 11:50 PM CDT (04:50 UTC)
Expired
May 12, 2022, 1:45 AM CDT
In force
115 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch unlikely
Chance of a watch
20%
All 27 counties

Boyd County, NE, Keya Paha County, NE, Rock County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Tripp County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 150 km from the middle of the area, began a volume at 04:50 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

Aberdeen, SD (KABR), launched 00:00Z, 4.8 hours before the alert went out and 140 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, Aberdeen, SD at 00:00Z on 2022-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 482 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2022-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 square meters per square second.19395878Sfc1 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
482 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
864 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
228 m²/s²
0-3 km storm-relative helicity
328 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

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 12, 1:39 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Cedar and 27 more3 hr
May 12, 2:14 PM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Boone, Boyd, Buffalo, Burt and 52 more8 hr
May 12, 2:42 PM CDTMesoscale DiscussionSPCAntelope, Boone, Cedar, Garfield, Greeley, Howard and 11 more2 hr
May 12, 3:27 PM CDTSevere Thunderstorm Watch PDSSPCDakota, Dixon7 hr
May 12, 4:32 PM CDTMesoscale DiscussionSPCCedar, Dixon58 min
May 12, 5:07 PM CDTMesoscale DiscussionSPCButler, Cass, Clay, Colfax, Dodge, Douglas and 17 more53 min
May 12, 5:43 PM CDTMesoscale DiscussionSPCFranklin, Furnas, Gosper, Harlan, Kearney, Phelps62 min
May 12, 6:12 PM CDTMesoscale DiscussionSPCBurt, Butler, Colfax, Cuming, Dakota, Dodge and 7 more63 min
May 12, 2:00 AM CDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Campbell and 29 more3 hr
May 12, 7:38 AM CDTMesoscale DiscussionSPCGrant2 hr
May 12, 2:47 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 32 more2 hr
May 12, 3:50 PM CDTTornado WatchSPCBeadle, Brookings, Brown, Buffalo, Campbell, Clark and 21 more5 hr
May 12, 5:23 PM CDTMesoscale DiscussionSPCBeadle, Brown, Clark, Codington, Day, Deuel and 10 more2 hr

Nearby

Mesoscale Discussions in South Dakota, 2022Mesoscale Discussions in Nebraska, 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.