Alert archive / Minnesota / Mesoscale Discussions in 2012

Mesoscale Discussion 1231

June 20, 20125 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2012, 5:27 AM CDT for 5 counties in Minnesota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 20, 2012, 5:27 AM CDT (10:27 UTC)
Expired: Jun 20, 2012, 7:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Carlton County, MN, Crow Wing County, MN, Mille Lacs County, MN, Morrison County, MN

The radar

The Duluth radar (KDLH), 102 km from the middle of the area, began a volume at 10:26 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, 10.5 hours before the alert went out and 166 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: 3249 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1302 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 4.4
Supercell composite: 29.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 7:01 PM CDT	Severe Thunderstorm Watch	SPC	Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more	7 hr
Jun 19, 9:12 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Big Stone, Chippewa, Chisago, Douglas and 22 more	93 min
Jun 19, 9:17 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Cass, Clay, Crow Wing, Hubbard and 7 more	88 min
Jun 19, 11:20 PM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Traverse	5 hr
Jun 19, 11:37 PM CDT	Mesoscale Discussion	SPC	Aitkin, Benton, Big Stone, Carlton, Cass, Chippewa and 22 more	83 min
Jun 20, 4:00 AM CDT	Mesoscale Discussion	SPC	Lac qui Parle	60 min
Jun 20, 9:40 AM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Chisago, Isanti, Kanabec, Mille Lacs and 3 more	95 min
Jun 20, 2:10 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Dakota, Dodge, Faribault, Fillmore, Freeborn and 11 more	95 min

Nearby

Mesoscale Discussions in Minnesota, 2012 Every mesoscale discussion in 2012

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.