Alert archive / Minnesota / Mesoscale Discussions in 2020

Mesoscale Discussion 1548

August 22, 20209 counties in Minnesota; Burnett County, Douglas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2020, 4:54 PM CDT for 9 counties in Minnesota; Burnett County, Douglas County, Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 22, 2020, 4:54 PM CDT (21:54 UTC)
Expired: Aug 22, 2020, 7:30 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Itasca County, MN, Kanabec County, MN, Koochiching County, MN, Pine County, MN, Saint Louis County, MN, Burnett County, WI, Douglas County, WI

The radar

The Duluth radar (KDLH), 125 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 299 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1360 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -134 m²/s²
0-3 km storm-relative helicity: -44 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
Aug 21, 7:47 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Kandiyohi, Le Sueur, McLeod and 7 more	118 min
Aug 21, 9:54 PM CDT	Mesoscale Discussion	SPC	Anoka, Blue Earth, Chisago, Dakota, Dodge, Goodhue and 11 more	2 hr

Nearby

Mesoscale Discussions in Minnesota, 2020 Mesoscale Discussions in Wisconsin, 2020 Every mesoscale discussion in 2020

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.