Alert archive / Wisconsin / Mesoscale Discussions in 2025

Mesoscale Discussion 792

May 15, 2025Ramsey County, Washington County, Minnesota; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 15, 2025, 3:00 PM CDT for Ramsey County, Washington County, Minnesota; 5 counties in Wisconsin. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 15, 2025, 3:00 PM CDT (20:00 UTC)
Expired: May 15, 2025, 4:30 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 251

Counties Ramsey County, MN, Washington County, MN, Dunn County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 100 km from the middle of the area, began a volume at 20:01 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 12:00Z, 8.0 hours before the alert went out and 102 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: 515 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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.

Issued	Product	Office	Counties	Lasted
May 15, 1:08 AM CDT	Mesoscale Discussion	SPC	Lincoln, Lyon, Murray, Nobles, Pipestone, Rock	97 min
May 15, 1:36 AM CDT	Severe Thunderstorm Watch	SPC	Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more	6 hr
May 15, 4:04 AM CDT	Mesoscale Discussion	SPC	Big Stone, Brown, Chippewa, Cottonwood, Jackson, Kandiyohi and 16 more	86 min
May 15, 7:23 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 28 more	97 min
May 15, 12:08 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Blue Earth, Carver, Chippewa, Chisago and 31 more	3 hr
May 15, 12:46 PM CDT	Tornado Watch	SPC	Aitkin, Anoka, Benton, Carver, Cass, Chisago and 29 more	7 hr
May 15, 1:42 PM CDT	Mesoscale Discussion	SPC	Anoka, Carver, Dakota, Goodhue, Hennepin, Ramsey and 3 more	63 min
May 15, 2:14 PM CDT	Mesoscale Discussion	SPC	Adams, Columbia, Crawford, Dane, Dodge, Grant and 13 more	2 hr
May 15, 3:05 PM CDT	Tornado Watch	SPC	Adams, Brown, Calumet, Columbia, Crawford, Dane and 42 more	6 hr
May 15, 5:36 PM CDT	Mesoscale Discussion	SPC	Calumet, Dodge, Fond du Lac, Green Lake, Lincoln, Marathon and 10 more	84 min
May 15, 6:07 PM CDT	Mesoscale Discussion	SPC	Door, Florence, Forest, Marinette, Vilas	83 min

Nearby

Mesoscale Discussions in Wisconsin, 2025 Mesoscale Discussions in Minnesota, 2025 Every 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.