Alert archive / Iowa / Mesoscale Discussions in 2013

Mesoscale Discussion 1049

June 12, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2013, 6:40 PM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2013, 6:40 PM CDT (23:40 UTC)
Expired: Jun 12, 2013, 8:15 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 82 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Marshall County, IA, Mitchell County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Washington County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Mower County, MN, Winona County, MN, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, La Crosse County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 52 km from the middle of the area, began a volume at 23:41 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 12:00Z, 11.7 hours before the alert went out and 50 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: 1812 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 1138 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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
Jun 12, 10:26 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more	64 min
Jun 12, 12:49 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Rock Island, Whiteside	56 min
Jun 12, 1:49 PM CDT	Tornado Watch PDS	SPC	Boone, Bureau, Carroll, DeKalb, Grundy, Henry and 13 more	9 hr
Jun 12, 3:38 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kane and 4 more	97 min
Jun 12, 4:00 PM CDT	Severe Thunderstorm Watch PDS	SPC	Cook, DuPage, Ford, Iroquois, Kankakee, Lake and 1 more	9 hr
Jun 12, 4:06 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Grundy, Henry and 12 more	54 min
Jun 12, 5:56 PM CDT	Mesoscale Discussion	SPC	Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 8 more	94 min
Jun 11, 11:12 PM CDT	Mesoscale Discussion	SPC	Cherokee, Clay, Dickinson, Ida, Lyon, O'Brien and 4 more	2 hr
Jun 12, 4:37 AM CDT	Mesoscale Discussion	SPC	Big Stone, Chippewa, Kandiyohi, Lac qui Parle, Lincoln, Lyon and 11 more	2 hr

Nearby

Mesoscale Discussions in Iowa, 2013 Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Wisconsin, 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.