Alert archive / Minnesota / Mesoscale Discussions in 2015

Mesoscale Discussion 1379

July 12, 20157 counties in Iowa; 19 counties in Minnesota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2015, 3:53 PM CDT for 7 counties in Iowa; 19 counties in Minnesota; 10 counties in South Dakota. It was in force for 82 min.

The area

The outline as issued.

The facts

Issued: Jul 12, 2015, 3:53 PM CDT (20:53 UTC)
Expired: Jul 12, 2015, 5:15 PM CDT
In force: 82 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 36 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Big Stone County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Watonwan County, MN, Yellow Medicine County, MN, Brookings County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Lake County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD

The radar

The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 20:51 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.

Tornado Watch 406Jul 12, 5:20 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.9 hours before the alert went out and 205 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: 1730 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 12, 5:28 PM CDT	Tornado Watch	SPC	Buena Vista, Calhoun, Cerro Gordo, Cherokee, Clay, Dickinson and 15 more	5 hr
Jul 12, 10:05 AM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Itasca, Kanabec, Koochiching and 3 more	85 min
Jul 12, 2:54 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Douglas, Grant and 15 more	96 min
Jul 12, 3:06 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 12 more	7 hr
Jul 12, 5:53 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Douglas, Grant and 13 more	97 min
Jul 11, 9:04 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Clark, Codington, Corson, Day and 11 more	86 min

Nearby

Mesoscale Discussions in Minnesota, 2015 Mesoscale Discussions in South Dakota, 2015 Mesoscale Discussions in Iowa, 2015 Every mesoscale discussion in 2015

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.