Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1556

July 10, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2011, 1:03 AM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 10, 2011, 1:03 AM CDT (06:03 UTC)
Expired: Jul 10, 2011, 3:00 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center

All 39 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Sioux County, IA, Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Faribault County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Watonwan County, MN, Boyd County, NE, Holt County, NE, Knox County, NE, Rock County, NE, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 53 km from the middle of the area, began a volume at 06:04 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, 6.1 hours before the alert went out and 219 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: 1119 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1441 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.8

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 10, 2:45 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Henry, Jackson, Jefferson and 9 more	2 hr
Jul 10, 6:39 AM CDT	Mesoscale Discussion	SPC	Winona	66 min
Jul 10, 2:29 PM CDT	Tornado Watch	SPC	Big Stone, Clay, Grant, Otter Tail, Traverse, Wilkin	7 hr
Jul 10, 5:25 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Big Stone, Blue Earth, Brown, Carver and 35 more	95 min
Jul 10, 6:12 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more	8 hr
Jul 9, 8:11 PM CDT	Mesoscale Discussion	SPC	Buffalo, Chase, Dawson, Dundy, Frontier, Furnas and 7 more	94 min
Jul 10, 4:02 PM CDT	Mesoscale Discussion	SPC	Arthur, Chase, Deuel, Dundy, Frontier, Garden and 11 more	118 min
Jul 10, 10:32 AM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Corson, Day, Edmunds, McPherson and 3 more	118 min
Jul 10, 11:08 AM CDT	Severe Thunderstorm Watch	SPC	Campbell, Corson, McPherson	8 hr
Jul 10, 2:08 PM CDT	Mesoscale Discussion	SPC	Campbell, Corson, McPherson	97 min

Nearby

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