Alert archive / Minnesota / Mesoscale Discussions in 2025

Mesoscale Discussion 784

May 15, 20257 counties in Iowa; 22 counties in Minnesota; Deuel County, Grant County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 15, 2025, 4:04 AM CDT for 7 counties in Iowa; 22 counties in Minnesota; Deuel County, Grant County, South Dakota. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
May 15, 2025, 4:04 AM CDT (09:04 UTC)
Expired
May 15, 2025, 5:30 AM CDT
In force
86 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 250
All 31 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Big Stone County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Redwood County, MN, Renville County, MN, Sibley County, MN, Stevens County, MN, Swift County, MN, Watonwan County, MN, Yellow Medicine County, MN, Deuel County, SD, Grant County, SD

The radar

The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 09:06 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

Minneapolis, MN (KMPX), launched 00:00Z, 9.1 hours before the alert went out and 148 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, Minneapolis, MN at 00:00Z on 2025-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 561 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, Minneapolis, MN at 00:00Z on 2025-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.1939Sfc1 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
561 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1873 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
43 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 15, 1:08 AM CDTMesoscale DiscussionSPCCherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux and 1 more97 min
May 15, 1:36 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more6 hr
May 15, 7:23 AM CDTMesoscale DiscussionSPCLyon, Osceola, Sioux97 min
May 15, 2:14 PM CDTMesoscale DiscussionSPCDubuque, Jackson2 hr
May 15, 12:08 PM CDTMesoscale DiscussionSPCAnoka, Benton, Blue Earth, Carver, Chippewa, Chisago and 31 more3 hr
May 15, 12:46 PM CDTTornado WatchSPCAitkin, Anoka, Benton, Carver, Cass, Chisago and 29 more7 hr
May 15, 1:42 PM CDTMesoscale DiscussionSPCAnoka, Carver, Dakota, Goodhue, Hennepin, Ramsey and 3 more63 min
May 15, 3:00 PM CDTMesoscale DiscussionSPCRamsey, Washington90 min
May 14, 7:09 PM CDTMesoscale DiscussionSPCHughes, Hyde, Jones, Lyman, Mellette, Stanley and 3 more96 min
May 14, 8:01 PM CDTSevere Thunderstorm WatchSPCAurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 7 more8 hr
May 14, 10:11 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Douglas, Hutchinson94 min

Nearby

Mesoscale Discussions in Minnesota, 2025Mesoscale Discussions in Iowa, 2025Mesoscale Discussions in South Dakota, 2025Every mesoscale discussion in 2025

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.