Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 846

May 21, 200716 counties in Minnesota; Roberts County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 21, 2007, 1:07 PM CDT for 16 counties in Minnesota; Roberts County, South Dakota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 21, 2007, 1:07 PM CDT (18:07 UTC)
Expired: May 21, 2007, 2:30 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Becker County, MN, Benton County, MN, Big Stone County, MN, Cass County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Morrison County, MN, Otter Tail County, MN, Pope County, MN, Stearns County, MN, Stevens County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Roberts County, SD

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 6.1 hours before the alert went out and 332 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: 690 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 21, 3:59 AM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Cass, Clay, Clearwater, Hubbard and 11 more	91 min
May 20, 7:48 PM CDT	Mesoscale Discussion	SPC	Butte, Lawrence	87 min
May 21, 2:34 PM CDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Haakon, Hughes, Jackson and 13 more	86 min
May 21, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Campbell, Corson, Custer, Dewey and 18 more	8 hr
May 21, 6:17 PM CDT	Mesoscale Discussion	SPC	Butte, Campbell, Corson, Custer, Dewey, Haakon and 9 more	88 min

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.