Alert archive / Illinois / Tornado Watches in 2024

Tornado Watch 117

April 16, 20244 states

The Storm Prediction Center issued this tornado watch at Apr 16, 2024, 12:06 PM CDT for 4 states. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued: Apr 16, 2024, 12:06 PM CDT (17:06 UTC)
Expired: Apr 16, 2024, 10:00 PM CDT
In force: 10 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 65 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Scotland County, MO, Shelby County, MO, Grant County, WI

The radar

The Quad Cities radar (KDVN), 38 km from the middle of the area, began a volume at 17:06 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: 60%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 16, 12:47 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Shelby	32 min
Apr 16, 1:12 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren	33 min
Apr 16, 1:14 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	46 min
Apr 16, 1:31 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade, Lincoln, Montgomery, Osage, Warren	44 min
Apr 16, 1:38 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough	37 min
Apr 16, 2:10 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	20 min
Apr 16, 2:26 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw	49 min
Apr 16, 2:34 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn	41 min
Apr 16, 2:48 PM CDT	Tornado Warning	DVN	Benton, Buchanan, Linn	27 min
Apr 16, 2:58 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Jones, Linn	47 min
Apr 16, 3:02 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	43 min
Apr 16, 3:02 PM CDT	Severe Thunderstorm Warning	LSX	Knox	28 min
Apr 16, 3:13 PM CDT	Tornado Warning	DVN	Buchanan, Delaware	32 min
Apr 16, 3:15 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Buchanan, Delaware, Dubuque, Johnson, Jones, Linn	45 min
Apr 16, 3:17 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	43 min
Apr 16, 3:19 PM CDT	Tornado Warning	ARX	Clayton, Fayette	26 min
Apr 16, 3:20 PM CDT	Tornado Warning	DVN	Cedar, Delaware, Dubuque, Jones, Linn	25 min
Apr 16, 3:39 PM CDT	Tornado Warning	DVN	Van Buren	51 min
Apr 16, 3:43 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren, Washington	47 min
Apr 16, 3:47 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	13 min
Apr 16, 3:47 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Keokuk, Linn, Washington	43 min
Apr 16, 3:57 PM CDT	Severe Thunderstorm Warning	DVN	Washington	33 min
Apr 16, 4:13 PM CDT	Tornado Warning	DVN	Henry, Lee, Van Buren	47 min
Apr 16, 4:14 PM CDT	Tornado Warning	DVN	Clark, Scotland	46 min
Apr 16, 4:17 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Linn	28 min
Apr 16, 4:23 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Delaware, Dubuque, Jackson, Johnson and 5 more	52 min
Apr 16, 4:25 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Johnson, Louisa, Muscatine, Washington	50 min
Apr 16, 4:49 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	41 min
Apr 16, 4:51 PM CDT	Tornado Warning Tornado observed	DVN	Des Moines, Henry, Louisa	39 min
Apr 16, 4:54 PM CDT	Tornado Warning	DVN	Hancock, Henderson	51 min
Apr 16, 5:02 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	43 min
Apr 16, 5:13 PM CDT	Severe Thunderstorm Warning	ARX	Clayton	32 min
Apr 16, 5:14 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	21 min
Apr 16, 5:20 PM CDT	Tornado Warning	DVN	Mercer, Rock Island	40 min
Apr 16, 5:40 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Warren	50 min
Apr 16, 5:46 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Lee	29 min
Apr 16, 5:54 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island	51 min
Apr 16, 5:59 PM CDT	Tornado Warning	DVN	Scott	31 min
Apr 16, 6:20 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island, Warren	36 min
Apr 16, 6:22 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island, Whiteside	23 min
Apr 16, 6:41 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	49 min
Apr 16, 6:42 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Rock Island, Whiteside	48 min
Apr 16, 6:56 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Warren	64 min
Apr 16, 7:02 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	43 min
Apr 16, 7:18 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	57 min
Apr 16, 7:33 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	23 min
Apr 16, 7:40 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Rock Island, Whiteside	50 min
Apr 16, 8:01 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough	44 min
Apr 16, 8:02 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	43 min
Apr 16, 8:04 PM CDT	Severe Thunderstorm Warning	ILX	Schuyler	21 min
Apr 16, 8:07 PM CDT	Severe Thunderstorm Warning	DVN	Mercer	23 min
Apr 16, 8:08 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry	52 min
Apr 16, 8:28 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess, Stephenson	47 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, 5.1 hours before the alert went out and 44 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: 1439 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 392 m²/s²
0-3 km storm-relative helicity: 424 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 11:04 AM CDT	Mesoscale Discussion	SPC	Adams, Hancock	2 hr
Apr 16, 1:56 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Fulton, Greene and 17 more	64 min
Apr 16, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Christian, Clay, Clinton, Effingham and 14 more	5 hr
Apr 16, 3:40 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Champaign, DeKalb, DeWitt, Douglas and 23 more	95 min
Apr 16, 4:47 PM CDT	Mesoscale Discussion	SPC	Carroll, Hancock, Henderson, Henry, Jo Daviess, Mercer and 3 more	88 min
Apr 16, 5:52 PM CDT	Tornado Watch	SPC	Boone, DeKalb, LaSalle, Lee, Ogle, Winnebago	4 hr
Apr 16, 6:23 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Pike	2 hr
Apr 16, 2:14 AM CDT	Tornado Watch	SPC	Fremont, Harrison, Mills, Pottawattamie	6 hr
Apr 16, 6:00 AM CDT	Mesoscale Discussion	SPC	Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie	2 hr
Apr 16, 8:50 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Boone, Cass and 37 more	55 min
Apr 16, 10:22 AM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Black Hawk, Boone, Bremer and 28 more	8 hr
Apr 16, 11:43 AM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 13 more	92 min
Apr 16, 12:23 PM CDT	Tornado Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 25 more	7 hr
Apr 16, 2:03 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 16 more	87 min
Apr 16, 3:36 PM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 24 more	54 min
Apr 16, 6:12 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 16 more	63 min
Apr 15, 9:07 PM CDT	Mesoscale Discussion	SPC	Atchison, Holt	2 hr
Apr 16, 3:16 PM CDT	Mesoscale Discussion	SPC	Dunklin	89 min

Nearby

Tornado Watches in Illinois, 2024 Tornado Watches in Iowa, 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.