Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1793

July 30, 201115 counties in Minnesota; 6 counties in North Dakota; 8 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2011, 5:47 AM CDT for 15 counties in Minnesota; 6 counties in North Dakota; 8 counties in South Dakota. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jul 30, 2011, 5:47 AM CDT (10:47 UTC)
Expired: Jul 30, 2011, 7:15 AM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 29 counties

Big Stone County, MN, Brown County, MN, Chippewa County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Meeker County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Yellow Medicine County, MN, Dickey County, ND, LaMoure County, ND, McIntosh County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Brown County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 102 km from the middle of the area, began a volume at 10:47 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

Aberdeen, SD (KABR), launched 00:00Z, 10.8 hours before the alert went out and 123 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: 888 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 1717 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.1

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
Jul 30, 11:28 AM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Brown, Carver, Chippewa, Chisago and 24 more	3 hr
Jul 30, 1:28 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chippewa, Chisago and 32 more	112 min
Jul 30, 3:22 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Big Stone, Blue Earth, Brown, Carver and 38 more	53 min
Jul 30, 5:31 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Big Stone, Brown, Carlton and 41 more	7 hr
Jul 29, 9:06 PM CDT	Mesoscale Discussion	SPC	Adams, Bowman, Emmons, Grant, Hettinger, McIntosh and 2 more	54 min
Jul 29, 10:14 PM CDT	Mesoscale Discussion	SPC	Billings, Bottineau, Burke, Burleigh, Divide, Dunn and 12 more	61 min
Jul 29, 11:52 PM CDT	Mesoscale Discussion	SPC	Barnes, Benson, Billings, Bottineau, Burleigh, Dickey and 23 more	83 min

Nearby

Mesoscale Discussions in Minnesota, 2011 Mesoscale Discussions in South Dakota, 2011 Mesoscale Discussions in North 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.