Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 570

May 29, 201822 counties in Minnesota; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 29, 2018, 5:34 PM CDT for 22 counties in Minnesota; 10 counties in Wisconsin. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 29, 2018, 5:34 PM CDT (22:34 UTC)
Expired: May 29, 2018, 6:30 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center

All 32 counties

Aitkin County, MN, Anoka County, MN, Beltrami County, MN, Carlton County, MN, Cass County, MN, Chisago County, MN, Crow Wing County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Itasca County, MN, Kanabec County, MN, Koochiching County, MN, Mille Lacs County, MN, Pine County, MN, Ramsey County, MN, Rice County, MN, Saint Louis County, MN, Scott County, MN, Sherburne County, MN, Washington County, MN, Barron County, WI, Burnett County, WI, Chippewa County, WI, Douglas County, WI, Dunn County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 91 km from the middle of the area, began a volume at 22:37 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, 10.6 hours before the alert went out and 162 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: 138 J/kg
Mixed-layer CIN: -309 J/kg
Mixed-layer LCL: 1748 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 221 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.

Issued	Product	Office	Counties	Lasted
May 29, 1:22 PM CDT	Mesoscale Discussion	SPC	Brown, Chippewa, Cottonwood, Douglas, Jackson, Kandiyohi and 13 more	83 min
May 29, 1:43 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 34 more	6 hr
May 29, 3:54 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Becker, Benton, Blue Earth, Brown and 50 more	96 min

Nearby

Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in Wisconsin, 2018 Every mesoscale discussion in 2018

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.