Alert archive / Illinois / Mesoscale Discussions in 2006

Mesoscale Discussion 268

March 12, 200630 counties in Illinois; 22 counties in Iowa; 8 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2006, 7:15 PM CST for 30 counties in Illinois; 22 counties in Iowa; 8 counties in Wisconsin. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Mar 12, 2006, 7:15 PM CST (01:15 UTC)
Expired: Mar 12, 2006, 8:45 PM CST
In force: 90 min
Issued by: the Storm Prediction Center

All 60 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Wapello County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI

The radar

The Quad Cities radar (KDVN), 17 km from the middle of the area, began a volume at 01:18 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.3 hours before the alert went out and 10 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 86 kt
0-1 km storm-relative helicity: 756 m²/s²
0-3 km storm-relative helicity: 1064 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.3

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
Mar 12, 6:28 PM CST	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 17 more	92 min
Mar 12, 7:28 PM CST	Severe Thunderstorm Watch	SPC	Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside	7 hr
Mar 12, 8:00 PM CST	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 47 more	90 min
Mar 12, 8:42 PM CST	Tornado Watch	SPC	Adams, Bond, Boone, Brown, Bureau, Calhoun and 58 more	7 hr
Mar 12, 11:30 PM CST	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 41 more	2 hr
Mar 12, 11:52 PM CST	Mesoscale Discussion	SPC	Carroll	83 min
Mar 13, 12:35 AM CST	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 11 more	85 min
Mar 13, 1:06 AM CST	Tornado Watch	SPC	Alexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more	6 hr
Mar 13, 3:19 AM CST	Mesoscale Discussion	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more	86 min
Mar 13, 3:52 AM CST	Tornado Watch	SPC	Bond, Champaign, Clark, Clay, Coles, Crawford and 19 more	7 hr
Mar 13, 6:08 AM CST	Mesoscale Discussion	SPC	Alexander, Edwards, Gallatin, Hamilton, Hardin, Johnson and 7 more	97 min
Mar 13, 1:47 AM CST	Mesoscale Discussion	SPC	Adams, Calumet, Columbia, Crawford, Dane, Dodge and 21 more	58 min
Mar 13, 2:06 AM CST	Severe Thunderstorm Watch	SPC	Columbia, Crawford, Dane, Dodge, Fond du Lac, Grant and 17 more	2 hr
Mar 13, 7:57 AM CST	Mesoscale Discussion	SPC	Ashland, Barron, Buffalo, Chippewa, Clark, Dunn and 18 more	5 hr

Nearby

Mesoscale Discussions in Illinois, 2006 Mesoscale Discussions in Iowa, 2006 Mesoscale Discussions in Wisconsin, 2006 Every mesoscale discussion in 2006

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.