Alert archive / Illinois / Tornado Watches in 2024

Tornado Watch 68

April 1, 202432 counties in Illinois; 26 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 1, 2024, 4:49 PM CDT for 32 counties in Illinois; 26 counties in Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Apr 1, 2024, 4:49 PM CDT (21:49 UTC)
Expired: Apr 2, 2024, 12:00 AM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 58 counties

Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Pike County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Maries County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 26 km from the middle of the area, began a volume at 21:49 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: 50%
One or more EF2 to EF5 tornadoes: 40%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 70%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 1, 5:15 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Warren	45 min
Apr 1, 5:30 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	45 min
Apr 1, 5:49 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis	56 min
Apr 1, 5:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Callaway, Cole, Osage	63 min
Apr 1, 6:16 PM CDT	Tornado Warning	LSX	Cole, Osage	30 min
Apr 1, 6:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Saint Charles, Saint Louis, City of Saint Louis	49 min
Apr 1, 6:33 PM CDT	Tornado Warning	LSX	Saint Louis, City of Saint Louis	42 min
Apr 1, 6:34 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon, Shelby	26 min
Apr 1, 6:40 PM CDT	Severe Thunderstorm Warning	ILX	Christian	35 min
Apr 1, 6:43 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Warren	62 min
Apr 1, 6:48 PM CDT	Flash Flood Warning	ILX	Christian	3 hr
Apr 1, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Madison	30 min
Apr 1, 7:00 PM CDT	Severe Thunderstorm Warning	ILX	Macon, Moultrie, Piatt, Shelby	30 min
Apr 1, 7:15 PM CDT	Flash Flood Warning	ILX	Macon, Moultrie, Shelby	4 hr
Apr 1, 7:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	SGF	Camden, Dallas, Laclede, Morgan	66 min
Apr 1, 7:32 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	58 min
Apr 1, 7:35 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Douglas, Edgar, Vermilion	25 min
Apr 1, 7:35 PM CDT	Severe Thunderstorm Warning Destructive damage threat	SGF	Dallas, Laclede, Polk	55 min
Apr 1, 7:45 PM CDT	Tornado Warning	SGF	Dallas, Laclede, Polk	30 min
Apr 1, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	22 min
Apr 1, 8:30 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Moniteau, Osage	3 min
Apr 1, 8:34 PM CDT	Flash Flood Warning	ILX	Clark, Edgar	2 hr
Apr 1, 8:37 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Moniteau, Osage	53 min
Apr 1, 9:11 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Gasconade, Montgomery, Osage	23 min
Apr 1, 10:19 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	41 min
Apr 1, 10:29 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade	46 min
Apr 1, 10:41 PM CDT	Severe Thunderstorm Warning Considerable damage threat	SGF	Dallas, Greene, Laclede, Polk, Webster	49 min
Apr 1, 10:45 PM CDT	Tornado Warning	SGF	Dallas, Greene, Laclede, Polk, Webster	30 min
Apr 1, 10:47 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, City of Saint Louis	58 min
Apr 1, 10:53 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	49 min
Apr 1, 11:14 PM CDT	Tornado Warning	SGF	Laclede	31 min
Apr 1, 11:17 PM CDT	Tornado Warning	SGF	Laclede	28 min
Apr 1, 11:20 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Laclede, Phelps, Pulaski, Texas, Webster and 1 more	40 min
Apr 1, 11:26 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	20 min
Apr 1, 11:28 PM CDT	Severe Thunderstorm Warning Considerable damage threat	SGF	Camden, Maries, Miller, Phelps, Pulaski	47 min
Apr 1, 11:34 PM CDT	Tornado Warning	SGF	Laclede, Phelps, Pulaski, Texas	26 min
Apr 1, 11:38 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, City of Saint Louis	22 min
Apr 1, 11:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	SGF	Dent, Maries, Phelps, Pulaski	46 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

Lincoln, IL (KILX), launched 12:00Z, 9.8 hours before the alert went out and 221 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: 621 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 31, 7:38 PM CDT	Mesoscale Discussion	SPC	Clark, Coles, DeWitt, Douglas, Edgar, Logan and 3 more	2 hr
Apr 1, 12:35 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 37 more	115 min
Apr 1, 3:50 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clark, Clinton, Coles and 19 more	115 min
Apr 1, 6:45 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 19 more	90 min
Apr 1, 1:13 PM CDT	Mesoscale Discussion	SPC	Bates, Cass	2 hr
Apr 1, 3:01 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Buchanan, Caldwell and 44 more	89 min
Apr 1, 3:29 PM CDT	Tornado Watch	SPC	Andrew, Barry, Barton, Bates, Benton, Buchanan and 46 more	8 hr
Apr 1, 5:28 PM CDT	Mesoscale Discussion	SPC	Audrain, Barton, Bates, Benton, Boone, Callaway and 30 more	92 min

Nearby

Tornado Watches in Illinois, 2024 Tornado Watches in Missouri, 2024 Every tornado watch in 2024

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.