Alert archive / Illinois / Mesoscale Discussions in 2006

Mesoscale Discussion 148

February 16, 200626 counties in Illinois; 21 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 16, 2006, 12:45 PM CST for 26 counties in Illinois; 21 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Feb 16, 2006, 12:45 PM CST (18:45 UTC)
Expired: Feb 16, 2006, 2:15 PM CST
In force: 90 min
Issued by: the Storm Prediction Center

All 47 counties

Bond County, IL, Calhoun County, IL, Champaign County, IL, Christian County, IL, DeWitt County, IL, Ford County, IL, Greene County, IL, Iroquois County, IL, Jersey County, IL, Kankakee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Christian County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Maries County, MO, Osage County, MO, Phelps County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Louis County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 14 km from the middle of the area, began a volume at 18:45 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.

Tornado Watch 33Feb 16, 1:15 PM CST

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.8 hours before the alert went out and 252 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: 372 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 548 m²/s²
0-3 km storm-relative helicity: 589 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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
Feb 16, 5:16 AM CST	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Mercer, Ogle, Rock Island, Stephenson and 2 more	5 hr
Feb 16, 9:41 AM CST	Mesoscale Discussion	SPC	Cook, DeKalb, DuPage, Ford, Grundy, Kane and 8 more	2 hr
Feb 16, 1:16 PM CST	Tornado Watch	SPC	Bond, Calhoun, Champaign, Christian, Clark, Clay and 47 more	7 hr
Feb 16, 4:55 PM CST	Mesoscale Discussion	SPC	Alexander, Bond, Champaign, Clark, Clay, Clinton and 41 more	95 min
Feb 16, 5:13 PM CST	Tornado Watch	SPC	Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 3 more	6 hr
Feb 16, 5:59 PM CST	Mesoscale Discussion	SPC	Crawford	61 min

Nearby

Mesoscale Discussions in Illinois, 2006 Mesoscale Discussions in Missouri, 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.