Alert archive / Wisconsin / Mesoscale Discussions in 2013

Mesoscale Discussion 1900

September 19, 201313 counties in Illinois; 9 counties in Iowa; 15 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2013, 7:36 PM CDT for 13 counties in Illinois; 9 counties in Iowa; 15 counties in Wisconsin. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Sep 19, 2013, 7:36 PM CDT (00:36 UTC)
Expired: Sep 19, 2013, 9:30 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 37 counties

Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Boone County, IL, Carroll County, IL, DeKalb County, IL, Henry County, IL, Jo Daviess County, IL, Lee County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 86 km from the middle of the area, began a volume at 00:37 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, 0.6 hours before the alert went out and 81 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: 1050 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1948 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

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