Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 951

June 1, 200717 counties in Illinois; 9 counties in Iowa; 9 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2007, 2:35 PM CDT for 17 counties in Illinois; 9 counties in Iowa; 9 counties in Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2007, 2:35 PM CDT (19:35 UTC)
Expired: Jun 1, 2007, 4:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 35 counties

Allamakee County, IA, Buchanan County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Jones County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI

The radar

The Quad Cities radar (KDVN), 73 km from the middle of the area, began a volume at 19:36 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, 7.6 hours before the alert went out and 70 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: 259 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 1, 11:09 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Carroll, Cass and 29 more	2 hr
Jun 1, 12:35 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, DeKalb, Fulton, Grundy and 23 more	6 hr

Nearby

Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Wisconsin, 2007 Every mesoscale discussion in 2007

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.