Alert archive / South Dakota / Mesoscale Discussions in 2022

Mesoscale Discussion 739

May 12, 20224 states

The Storm Prediction Center issued this mesoscale discussion at May 12, 2022, 4:32 PM CDT for 4 states. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
May 12, 2022, 4:32 PM CDT (21:32 UTC)
Expired
May 12, 2022, 5:30 PM CDT
In force
58 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 208
All 25 counties

Lyon County, IA, Plymouth County, IA, Sioux County, IA, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Cedar County, NE, Dixon County, NE, Bon Homme County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 47 km from the middle of the area, began a volume at 21:32 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

Omaha, NE (KOAX), launched 12:00Z, 9.5 hours before the alert went out and 239 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, Omaha, NE at 12:00Z on 2022-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1555 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, Omaha, NE at 12:00Z on 2022-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 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
1555 J/kg
Mixed-layer CIN
-323 J/kg
Mixed-layer LCL
1486 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
-52 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 11, 7:01 PM CDTMesoscale DiscussionSPCDickinson, Emmet, Kossuth, Winnebago59 min
May 12, 2:14 PM CDTSevere Thunderstorm WatchSPCFremont, Harrison, Mills, Monona, Pottawattamie, Shelby8 hr
May 12, 3:27 PM CDTSevere Thunderstorm Watch PDSSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more7 hr
May 12, 6:12 PM CDTMesoscale DiscussionSPCCherokee, Crawford, Harrison, Ida, Monona, Sac and 1 more63 min
May 11, 7:20 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Cass, Clay, Clearwater, Hubbard and 8 more115 min
May 11, 8:58 PM CDTSevere Thunderstorm WatchSPCPine4 hr
May 11, 9:44 PM CDTMesoscale DiscussionSPCChisago, Dodge, Faribault, Freeborn, Goodhue, Kanabec and 6 more91 min
May 12, 7:38 AM CDTMesoscale DiscussionSPCBenton, Big Stone, Chippewa, Crow Wing, Douglas, Grant and 14 more2 hr
May 12, 10:54 AM CDTMesoscale DiscussionSPCAnoka, Benton, Chisago, Hennepin, Isanti, Kanabec and 7 more3 hr
May 12, 12:17 PM CDTSevere Thunderstorm WatchSPCAitkin, Anoka, Carlton, Cass, Chisago, Crow Wing and 5 more5 hr
May 12, 5:23 PM CDTMesoscale DiscussionSPCBig Stone, Grant, Lac qui Parle, Stevens, Traverse2 hr
May 12, 5:35 PM CDTTornado WatchSPCAnoka, Becker, Benton, Big Stone, Blue Earth, Brown and 47 more6 hr
May 11, 11:50 PM CDTMesoscale DiscussionSPCBoyd, Keya Paha, Rock115 min
May 12, 1:39 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Cedar and 27 more3 hr
May 12, 2:42 PM CDTMesoscale DiscussionSPCAntelope, Boone, Cedar, Garfield, Greeley, Howard and 11 more2 hr
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, 2:00 AM CDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Campbell and 29 more3 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

Nearby

Mesoscale Discussions in South Dakota, 2022Mesoscale Discussions in Minnesota, 2022Mesoscale Discussions in Iowa, 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.