Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1736

July 25, 201112 counties in Minnesota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2011, 2:56 PM CDT for 12 counties in Minnesota; 10 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2011, 2:56 PM CDT (19:56 UTC)
Expired: Jul 25, 2011, 4:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 22 counties

Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Watonwan County, MN, Yellow Medicine County, MN, Brookings County, SD, Clark County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Moody County, SD, Spink County, SD

The radar

The Sioux Falls radar (KFSD), 123 km from the middle of the area, began a volume at 19:59 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 12:00Z, 7.9 hours before the alert went out and 207 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: 1775 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 206 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
Jul 25, 12:23 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Corson, Custer, Dewey, Fall River and 12 more	97 min
Jul 25, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 9 more	8 hr
Jul 25, 5:39 PM CDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence, Meade, Pennington, Perkins	96 min

Nearby

Mesoscale Discussions in Minnesota, 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.