Alert archive / Iowa / Mesoscale Discussions in 2013

Mesoscale Discussion 1052

June 12, 20137 counties in Illinois; 13 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2013, 8:53 PM CDT for 7 counties in Illinois; 13 counties in Iowa. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2013, 8:53 PM CDT (01:53 UTC)
Expired: Jun 12, 2013, 9:30 PM CDT
In force: 37 min
Issued by: the Storm Prediction Center

Counties Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Grundy County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Scott County, IA, Tama County, IA, Bureau County, IL, Carroll County, IL, Jo Daviess County, IL, Lee County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 59 km from the middle of the area, began a volume at 01:57 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

Davenport, (KDVN), launched 00:00Z, 1.9 hours before the alert went out and 62 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: 1702 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1576 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.2

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
Jun 12, 8:47 PM CDT	Mesoscale Discussion	SPC	Iroquois, Kankakee, Vermilion	88 min
Jun 12, 11:50 PM CDT	Mesoscale Discussion	SPC	Champaign, Cook, DuPage, Ford, Grundy, Iroquois and 7 more	85 min

Nearby

Mesoscale Discussions in Iowa, 2013 Mesoscale Discussions in Illinois, 2013 Every mesoscale discussion in 2013

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.