Alert archive / Minnesota / Mesoscale Discussions in 2016

Mesoscale Discussion 1476

August 4, 2016Dickinson County, Osceola County, Iowa; 11 counties in Minnesota; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2016, 3:58 AM CDT for Dickinson County, Osceola County, Iowa; 11 counties in Minnesota; 5 counties in South Dakota. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 4, 2016, 3:58 AM CDT (08:58 UTC)
Expired: Aug 4, 2016, 5:00 AM CDT
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Dickinson County, IA, Osceola County, IA, Brown County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Watonwan County, MN, Brookings County, SD, Lake County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 88 km from the middle of the area, began a volume at 09:02 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 00:00Z, 9.0 hours before the alert went out and 203 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: 1240 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1342 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 12:15 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Cedar and 11 more	2 hr
Aug 4, 4:44 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Fremont, Mills, Montgomery and 2 more	3 hr
Aug 4, 4:44 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 26 more	6 hr
Aug 4, 4:48 PM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 15 more	87 min
Aug 3, 9:07 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Cass, Clay, Clearwater and 15 more	113 min
Aug 3, 10:59 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Big Stone, Cass, Clay, Clearwater and 21 more	7 hr
Aug 4, 2:59 AM CDT	Mesoscale Discussion	SPC	Aitkin, Benton, Carlton, Chisago, Crow Wing, Isanti and 5 more	31 min

Nearby

Mesoscale Discussions in Minnesota, 2016 Mesoscale Discussions in South Dakota, 2016 Mesoscale Discussions in Iowa, 2016 Every mesoscale discussion in 2016

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.