Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1270

June 17, 201116 counties in Minnesota; Richland County, North Dakota; Roberts County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2011, 9:01 PM CDT for 16 counties in Minnesota; Richland County, North Dakota; Roberts County, South Dakota. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2011, 9:01 PM CDT (02:01 UTC)
Expired: Jun 17, 2011, 10:00 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Big Stone County, MN, Chippewa County, MN, Grant County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, McLeod County, MN, Meeker County, MN, Pope County, MN, Renville County, MN, Sibley County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Wilkin County, MN, Yellow Medicine County, MN, Richland County, ND, Roberts County, SD

The radar

The Minneapolis radar (KMPX), 181 km from the middle of the area, began a volume at 02:00 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, 2.0 hours before the alert went out and 178 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: 1159 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1224 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.4

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 17, 7:09 PM CDT	Severe Thunderstorm Watch	SPC	Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more	3 hr
Jun 17, 7:22 PM CDT	Tornado Watch	SPC	Chippewa, Douglas, Kandiyohi, Lac qui Parle, McLeod, Meeker and 8 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2011 Mesoscale Discussions in North Dakota, 2011 Mesoscale Discussions in South Dakota, 2011 Every mesoscale discussion in 2011

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.