Alert archive / Illinois / Tornado Watches in 2006

Tornado Watch 193

April 16, 200650 counties in Illinois; 40 counties in Iowa; 15 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 16, 2006, 11:17 AM CDT for 50 counties in Illinois; 40 counties in Iowa; 15 counties in Missouri. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Apr 16, 2006, 11:17 AM CDT (16:17 UTC)
Expired: Apr 16, 2006, 7:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center

All 105 counties

Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Bond County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, DeWitt County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Washington County, IL, Whiteside County, IL, Woodford County, IL, City of Saint Louis, MO, Clark County, MO, Franklin County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO

The radar

The Quad Cities radar (KDVN), 128 km from the middle of the area, began a volume at 16:18 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.

Warnings issued inside it

33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 16, 12:32 PM CDT	Severe Thunderstorm Warning	DVN	Linn	43 min
Apr 16, 12:52 PM CDT	Severe Thunderstorm Warning	DVN	Mercer	53 min
Apr 16, 1:23 PM CDT	Severe Thunderstorm Warning	ILX	Peoria	49 min
Apr 16, 1:25 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	65 min
Apr 16, 1:34 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Menard, Sangamon	56 min
Apr 16, 1:38 PM CDT	Tornado Warning	ILX	Tazewell	52 min
Apr 16, 2:02 PM CDT	Severe Thunderstorm Warning	ILX	Peoria, Woodford	43 min
Apr 16, 2:13 PM CDT	Tornado Warning	ILX	McLean, Tazewell, Woodford	47 min
Apr 16, 2:24 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	51 min
Apr 16, 2:27 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon	48 min
Apr 16, 2:33 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Macon	42 min
Apr 16, 2:44 PM CDT	Severe Thunderstorm Warning	DVN	Henry	46 min
Apr 16, 2:44 PM CDT	Tornado Warning	LSX	Fayette, Montgomery	46 min
Apr 16, 2:53 PM CDT	Tornado Warning	ILX	Macon	37 min
Apr 16, 2:54 PM CDT	Severe Thunderstorm Warning	ILX	McLean	58 min
Apr 16, 3:00 PM CDT	Severe Thunderstorm Warning	ILX	McLean	45 min
Apr 16, 3:14 PM CDT	Tornado Warning	ILX	Macon, Piatt	46 min
Apr 16, 3:20 PM CDT	Tornado Warning	ILX	Christian, Shelby	25 min
Apr 16, 3:26 PM CDT	Tornado Warning	LSX	Fayette	49 min
Apr 16, 3:29 PM CDT	Tornado Warning	ILX	Piatt	46 min
Apr 16, 3:32 PM CDT	Tornado Warning	LSX	Bond, Fayette	43 min
Apr 16, 3:33 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	48 min
Apr 16, 3:38 PM CDT	Tornado Warning	ILX	Effingham, Shelby	52 min
Apr 16, 3:46 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Logan	22 min
Apr 16, 3:58 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Douglas, Moultrie, Shelby	62 min
Apr 16, 4:11 PM CDT	Tornado Warning	LSX	Fayette	24 min
Apr 16, 4:16 PM CDT	Tornado Warning	ILX	Effingham, Shelby	44 min
Apr 16, 4:27 PM CDT	Severe Thunderstorm Warning	ILX	Macon, Piatt	48 min
Apr 16, 5:01 PM CDT	Tornado Warning	ILX	Effingham	29 min
Apr 16, 5:19 PM CDT	Severe Thunderstorm Warning	ILX	McLean	41 min
Apr 16, 5:37 PM CDT	Severe Thunderstorm Warning	ILX	Cumberland, Effingham, Shelby	49 min
Apr 16, 5:53 PM CDT	Severe Thunderstorm Warning	ILX	Knox, Marshall, Peoria, Stark	67 min
Apr 16, 6:13 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Crawford, Cumberland, Effingham, Jasper	62 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 4.3 hours before the alert went out and 134 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: 19 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 383 m²/s²
0-3 km storm-relative helicity: 404 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 10:46 PM CDT	Mesoscale Discussion	SPC	Hancock, Henderson, Mercer, Rock Island, Warren	119 min
Apr 15, 11:39 PM CDT	Mesoscale Discussion	SPC	Adams, Pike	66 min
Apr 16, 7:15 AM CDT	Mesoscale Discussion	SPC	Gallatin, Hardin, Johnson, Massac, Pope, Saline	2 hr
Apr 16, 10:57 AM CDT	Mesoscale Discussion	SPC	Adams, Boone, Brown, Bureau, Calhoun, Carroll and 33 more	2 hr
Apr 16, 12:20 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Carroll, Cook, DeKalb, DuPage, Ford and 15 more	7 hr
Apr 16, 1:08 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Crawford, Douglas, Edgar, Ford and 3 more	97 min
Apr 16, 1:18 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Bureau, Calhoun, Cass and 45 more	57 min
Apr 16, 1:39 PM CDT	Tornado Watch	SPC	Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 11 more	7 hr
Apr 16, 3:24 PM CDT	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more	2 hr
Apr 16, 3:43 PM CDT	Mesoscale Discussion	SPC	Bond, Bureau, Cass, Champaign, Christian, Clark and 49 more	92 min
Apr 16, 3:50 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more	85 min
Apr 16, 6:14 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 19 more	2 hr
Apr 15, 9:14 PM CDT	Mesoscale Discussion	SPC	Appanoose, Boone, Clarke, Dallas, Decatur, Greene and 10 more	91 min

Nearby

Tornado Watches in Illinois, 2006 Tornado Watches in Iowa, 2006 Tornado Watches in Missouri, 2006 Every tornado watch 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.