Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 15

January 7, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Jan 7, 2008, 1:47 PM CST for 4 states. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jan 7, 2008, 1:47 PM CST (19:47 UTC)
Expired: Jan 7, 2008, 2:45 PM CST
In force: 58 min
Issued by: the Storm Prediction Center

All 64 counties

Des Moines County, IA, Lee County, IA, Scott County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Carroll County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Fulton County, IL, Greene County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Clark County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Walworth County, WI

The radar

The Lincoln radar (KILX), 68 km from the middle of the area, began a volume at 19:51 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

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 103 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: 383 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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, 7:26 AM CST	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Rock Island, Stephenson, Winnebago	2 hr
Jan 7, 1:52 PM CST	Tornado Watch	SPC	Adams, Brown, Calhoun, Cass, Champaign, Christian and 20 more	146 days
Jan 7, 2:35 PM CST	Tornado Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DeWitt and 31 more	6 hr
Jan 7, 4:34 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Christian, DeWitt and 15 more	86 min
Jan 7, 12:25 PM CST	Mesoscale Discussion	SPC	Barton, Bates, Benton, Boone, Callaway, Camden and 21 more	2 hr
Jan 7, 4:02 PM CST	Tornado Watch	SPC	Barry, Christian, McDonald, Newton, Stone, Taney	5 hr

Nearby

Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Missouri, 2008 Mesoscale Discussions in Wisconsin, 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.