Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 31

January 8, 2008Jo Daviess County, Illinois; 9 counties in Iowa; 7 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jan 8, 2008, 11:40 AM CST for Jo Daviess County, Illinois; 9 counties in Iowa; 7 counties in Wisconsin. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jan 8, 2008, 11:40 AM CST (17:40 UTC)
Expired: Jan 8, 2008, 4:45 PM CST
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Scott County, IA, Jo Daviess County, IL, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Sauk County, WI

The radar

The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 17:43 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.7 hours before the alert went out and 291 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: 772 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 120 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
Jan 7, 6:11 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Pike, Schuyler	94 min
Jan 7, 6:57 PM CST	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey, Madison, Monroe, Pike and 2 more	93 min
Jan 7, 7:03 PM CST	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 4 more	117 min
Jan 7, 7:48 PM CST	Tornado Watch PDS	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jackson and 12 more	9 hr
Jan 7, 10:04 PM CST	Mesoscale Discussion	SPC	Calhoun	86 min
Jan 7, 10:12 PM CST	Mesoscale Discussion	SPC	Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 12 more	2 hr
Jan 8, 11:27 AM CST	Mesoscale Discussion	SPC	Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more	2 hr
Jan 8, 12:22 PM CST	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 10 more	83 min
Jan 8, 1:11 PM CST	Mesoscale Discussion	SPC	Gallatin, Hardin, Massac, Pope	2 hr
Jan 8, 1:26 PM CST	Tornado Watch	SPC	Gallatin, Hardin, Massac, Pope	8 hr

Nearby

Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Wisconsin, 2008 Mesoscale Discussions in Illinois, 2008 Every mesoscale discussion in 2008

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.