Alert archive / Illinois / Tornado Watches in 2006

Tornado Watch 788

September 22, 200648 counties in Illinois; 37 counties in Missouri

The Storm Prediction Center issued this tornado watch at Sep 22, 2006, 1:16 PM CDT for 48 counties in Illinois; 37 counties in Missouri. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Sep 22, 2006, 1:16 PM CDT (18:16 UTC)
Expired: Sep 22, 2006, 9:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 85 counties

Adams County, IL, Alexander County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Audrain County, MO, Bollinger County, MO, Boone County, MO, Butler County, MO, Callaway County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Mississippi County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, New Madrid County, MO, Osage County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 18:19 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 70%
One or more EF2 to EF5 tornadoes: 40%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Sep 22, 1:59 PM CDT	Tornado Warning	LSX	Crawford, Franklin, Washington	76 min
Sep 22, 2:02 PM CDT	Tornado Warning	LSX	Crawford, Washington	43 min
Sep 22, 2:12 PM CDT	Tornado Warning	LSX	Iron, Reynolds	63 min
Sep 22, 2:43 PM CDT	Tornado Warning	LSX	Saint Francois, Washington	41 min
Sep 22, 3:10 PM CDT	Tornado Warning	LSX	Jefferson, Washington	37 min
Sep 22, 3:13 PM CDT	Tornado Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois	47 min
Sep 22, 3:16 PM CDT	Tornado Warning	PAH	Massac, Pulaski	44 min
Sep 22, 3:34 PM CDT	Tornado Warning	PAH	Perry	56 min
Sep 22, 3:38 PM CDT	Severe Thunderstorm Warning	PAH	Union	52 min
Sep 22, 3:44 PM CDT	Severe Thunderstorm Warning	PAH	Jackson, Williamson	61 min
Sep 22, 3:59 PM CDT	Tornado Warning	PAH	Jackson, Williamson	61 min
Sep 22, 4:03 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	42 min
Sep 22, 4:13 PM CDT	Tornado Warning	LSX	Iron, Reynolds, Washington	62 min
Sep 22, 4:14 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Fulton, Mason, Schuyler	46 min
Sep 22, 4:17 PM CDT	Tornado Warning	LSX	Franklin, Jefferson	43 min
Sep 22, 4:18 PM CDT	Tornado Warning	PAH	Johnson, Pope, Saline	27 min
Sep 22, 4:27 PM CDT	Tornado Warning	PAH	Jackson	48 min
Sep 22, 4:28 PM CDT	Severe Thunderstorm Warning	LSX	Washington	47 min
Sep 22, 4:37 PM CDT	Tornado Warning	LSX	Washington	30 min
Sep 22, 4:40 PM CDT	Severe Thunderstorm Warning	PAH	Butler	35 min
Sep 22, 4:43 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Mason, Tazewell	47 min
Sep 22, 4:47 PM CDT	Tornado Warning	LSX	Pike	28 min
Sep 22, 4:49 PM CDT	Tornado Warning	LSX	Monroe	41 min
Sep 22, 4:55 PM CDT	Tornado Warning	PAH	Franklin, Williamson	65 min
Sep 22, 4:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Washington	49 min
Sep 22, 5:02 PM CDT	Tornado Warning	PAH	Jefferson	22 min
Sep 22, 5:02 PM CDT	Tornado Warning	LSX	Sainte Genevieve, Saint Francois	58 min
Sep 22, 5:07 PM CDT	Tornado Warning	LSX	Jefferson	33 min
Sep 22, 5:07 PM CDT	Severe Thunderstorm Warning	PAH	New Madrid	53 min
Sep 22, 5:09 PM CDT	Tornado Warning	LSX	Brown, Pike	26 min
Sep 22, 5:11 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair, Washington	49 min
Sep 22, 5:14 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	46 min
Sep 22, 5:19 PM CDT	Tornado Warning	PAH	New Madrid	56 min
Sep 22, 5:28 PM CDT	Tornado Warning	LSX	Monroe	47 min
Sep 22, 5:30 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Menard, Morgan, Sangamon	45 min
Sep 22, 5:30 PM CDT	Tornado Warning	LSX	Washington	45 min
Sep 22, 5:33 PM CDT	Severe Thunderstorm Warning	ILX	Crawford, Lawrence, Richland	42 min
Sep 22, 5:34 PM CDT	Tornado Warning	ILX	Morgan, Scott	26 min
Sep 22, 5:39 PM CDT	Tornado Warning	PAH	Mississippi	66 min
Sep 22, 5:57 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	48 min
Sep 22, 6:01 PM CDT	Tornado Warning	LSX	Saint Clair	24 min
Sep 22, 6:14 PM CDT	Severe Thunderstorm Warning	PAH	New Madrid	16 min
Sep 22, 6:17 PM CDT	Severe Thunderstorm Warning	ILX	Logan	43 min
Sep 22, 6:19 PM CDT	Severe Thunderstorm Warning	LSX	Washington	56 min
Sep 22, 6:35 PM CDT	Severe Thunderstorm Warning	ILX	Sangamon	40 min
Sep 22, 6:38 PM CDT	Severe Thunderstorm Warning	LSX	Washington	52 min
Sep 22, 6:39 PM CDT	Tornado Warning	LSX	Washington	35 min
Sep 22, 6:46 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	44 min
Sep 22, 6:55 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt	50 min
Sep 22, 7:01 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Macon, Sangamon	44 min
Sep 22, 7:13 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	35 min
Sep 22, 7:53 PM CDT	Tornado Warning	PAH	Butler	49 min
Sep 22, 8:10 PM CDT	Severe Thunderstorm Warning	PAH	Scott, Stoddard	53 min
Sep 22, 8:28 PM CDT	Tornado Warning	PAH	New Madrid	62 min
Sep 22, 8:37 PM CDT	Severe Thunderstorm Warning	PAH	Alexander	53 min
Sep 22, 8:38 PM CDT	Flash Flood Warning	PAH	Williamson	2 hr
Sep 22, 8:54 PM CDT	Severe Thunderstorm Warning	PAH	Pulaski	51 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

Springfield, MO (KSGF), launched 12:00Z, 6.3 hours before the alert went out and 283 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: 409 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 642 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 311 m²/s²
0-3 km storm-relative helicity: 363 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 22, 12:49 PM CDT	Mesoscale Discussion	SPC	Adams, Alexander, Bond, Brown, Calhoun, Cass and 38 more	2 hr
Sep 22, 2:20 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more	2 hr
Sep 22, 2:55 PM CDT	Mesoscale Discussion	SPC	Gallatin, Hamilton, Hardin, Johnson, Massac, Pope and 2 more	2 hr
Sep 22, 3:00 PM CDT	Mesoscale Discussion	SPC	Adams, Alexander, Bond, Brown, Calhoun, Cass and 45 more	90 min
Sep 22, 3:32 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more	6 hr
Sep 22, 3:37 PM CDT	Tornado Watch	SPC	Edwards, Gallatin, Hamilton, Hardin, Massac, Pope and 4 more	8 hr
Sep 22, 5:08 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Brown, Calhoun, Cass, Christian and 44 more	2 hr
Sep 22, 5:37 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Ford and 24 more	113 min
Sep 21, 7:58 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Jasper, Lawrence, McDonald, Newton	2 hr
Sep 22, 4:08 AM CDT	Mesoscale Discussion	SPC	Butler, Dunklin, New Madrid, Pemiscot, Ripley, Stoddard	67 min
Sep 22, 4:39 AM CDT	Tornado Watch	SPC	Dunklin, Pemiscot	5 hr
Sep 22, 8:35 AM CDT	Mesoscale Discussion	SPC	Dunklin	85 min
Sep 22, 9:10 AM CDT	Tornado Watch PDS	SPC	Dunklin, Pemiscot	9 hr
Sep 22, 11:10 AM CDT	Mesoscale Discussion	SPC	Barry, Camden, Christian, Dade, Dallas, Greene and 11 more	95 min
Sep 22, 12:06 PM CDT	Tornado Watch PDS	SPC	Barry, Camden, Cedar, Christian, Dade, Dallas and 24 more	9 hr
Sep 22, 12:15 PM CDT	Mesoscale Discussion	SPC	Butler, Dunklin, Howell, New Madrid, Oregon, Ozark and 3 more	90 min
Sep 22, 6:29 PM CDT	Tornado Watch	SPC	Dunklin, Pemiscot	7 hr

Nearby

Tornado Watches in Illinois, 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.