Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 1228

June 21, 200738 counties in Minnesota; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 3:55 AM CDT for 38 counties in Minnesota; 4 counties in South Dakota. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2007, 3:55 AM CDT (08:55 UTC)
Expired: Jun 21, 2007, 5:30 AM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 42 counties

Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Wright County, MN, Yellow Medicine County, MN, Codington County, SD, Deuel County, SD, Grant County, SD, Roberts County, SD

The radar

The Minneapolis radar (KMPX), 101 km from the middle of the area, began a volume at 08:57 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 432Jun 21, 4:30 AM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.9 hours before the alert went out and 98 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: 551 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 2355 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 20, 8:28 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Dodge, Goodhue, Le Sueur, Olmsted, Rice and 2 more	92 min
Jun 20, 11:30 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Goodhue and 7 more	90 min
Jun 21, 2:10 AM CDT	Mesoscale Discussion	SPC	Big Stone, Lac qui Parle, Stevens, Traverse, Yellow Medicine	95 min
Jun 21, 2:29 AM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Traverse, Wilkin	8 hr
Jun 21, 4:27 AM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Brown, Carver, Chippewa, Dakota, Dodge and 33 more	8 hr
Jun 21, 7:14 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Chippewa, Cottonwood, Faribault, Jackson and 11 more	91 min
Jun 21, 9:10 AM CDT	Mesoscale Discussion	SPC	Cottonwood, Jackson, Lincoln, Murray, Nobles, Pipestone and 1 more	35 min
Jun 21, 9:38 AM CDT	Severe Thunderstorm Watch	SPC	Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more	6 hr
Jun 21, 11:08 AM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Brown, Carver, Chippewa, Dakota and 25 more	67 min
Jun 21, 11:55 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Carver, Dakota, Dodge, Faribault, Fillmore and 19 more	50 min
Jun 21, 11:59 AM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Brown, Carver, Dakota, Dodge, Faribault and 20 more	8 hr
Jun 21, 2:13 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 28 more	62 min
Jun 21, 3:15 PM CDT	Mesoscale Discussion	SPC	Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more	30 min
Jun 21, 3:25 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Dakota, Dodge, Faribault and 20 more	35 min
Jun 21, 5:42 PM CDT	Mesoscale Discussion	SPC	Houston	93 min
Jun 21, 5:34 AM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Clark, Codington, Corson, Day and 10 more	86 min
Jun 21, 2:43 PM CDT	Mesoscale Discussion	SPC	Corson, Dewey, Harding, Meade, Perkins, Ziebach	92 min
Jun 21, 4:37 PM CDT	Tornado Watch	SPC	Bennett, Butte, Custer, Dewey, Fall River, Haakon and 12 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2007 Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.