Alert archive / Iowa / Tornado Watches in 2026

Tornado Watch 311

June 11, 202621 counties in Illinois; 31 counties in Iowa; 10 counties in Missouri

The Storm Prediction Center issued this tornado watch at Jun 11, 2026, 7:31 AM CDT for 21 counties in Illinois; 31 counties in Iowa; 10 counties in Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2026, 7:31 AM CDT (12:31 UTC)
Expired: Jun 11, 2026, 3:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 70 kt

All 62 counties

Appanoose County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque 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, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Macon County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO

The radar

The Quad Cities radar (KDVN), 101 km from the middle of the area, began a volume at 12:31 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: 30%
Ten or more severe wind reports: 90%
One or more gusts of 65 knots or more: 50%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:38 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Lucas, Mahaska, Marion, Monroe, Wapello, Warren	52 min
Jun 11, 7:44 AM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Jasper, Mahaska, Marion, Marshall and 4 more	46 min
Jun 11, 7:49 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Appanoose, Davis, Decatur, Lucas, Monroe, Ringgold and 2 more	56 min
Jun 11, 7:55 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Grundy, Jasper, Marshall, Story, Tama	50 min
Jun 11, 7:55 AM CDT	Severe Thunderstorm Warning	EAX	Gentry, Grundy, Harrison, Mercer, Putnam, Worth	50 min
Jun 11, 8:11 AM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren	41 min
Jun 11, 8:12 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Mahaska, Monroe, Poweshiek, Wapello	48 min
Jun 11, 8:15 AM CDT	Tornado Warning	DMX	Mahaska, Poweshiek	30 min
Jun 11, 8:19 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Henry, Iowa, Jefferson, Johnson, Keokuk, Louisa and 1 more	71 min
Jun 11, 8:25 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Black Hawk, Grundy, Hardin, Jasper, Mahaska, Marion and 3 more	65 min
Jun 11, 8:28 AM CDT	Severe Thunderstorm Warning	EAX	Daviess, Grundy, Harrison, Mercer, Putnam, Schuyler and 1 more	47 min
Jun 11, 8:31 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn	74 min
Jun 11, 8:34 AM CDT	Severe Thunderstorm Warning Destructive damage threat	DVN	Iowa, Johnson, Keokuk, Washington	56 min
Jun 11, 8:38 AM CDT	Tornado Warning	DVN	Iowa, Keokuk	18 min
Jun 11, 8:45 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Wayne	60 min
Jun 11, 8:45 AM CDT	Flash Flood Warning	EAX	Grundy, Mercer, Putnam, Sullivan	3 hr
Jun 11, 8:54 AM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware	52 min
Jun 11, 9:06 AM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	Adair, Grundy, Linn, Macon, Mercer, Putnam and 2 more	54 min
Jun 11, 9:08 AM CDT	Tornado Warning	DVN	Iowa, Johnson, Linn	37 min
Jun 11, 9:18 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Mercer, Rock Island	52 min
Jun 11, 9:20 AM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Warren	54 min
Jun 11, 9:35 AM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Dubuque, Jackson, Johnson, Jones and 1 more	37 min
Jun 11, 9:36 AM CDT	Tornado Warning	EAX	Putnam, Schuyler	22 min
Jun 11, 9:56 AM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	Adair, Linn, Macon, Putnam, Schuyler, Sullivan	64 min
Jun 11, 10:09 AM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	51 min
Jun 11, 11:18 AM CDT	Severe Thunderstorm Warning	DVN	Iowa, Keokuk, Washington	22 min
Jun 11, 11:21 AM CDT	Severe Thunderstorm Warning	DVN	Hancock, Henderson, McDonough, Warren	54 min
Jun 11, 11:27 AM CDT	Flash Flood Warning	DVN	Clark, Scotland	6 hr
Jun 11, 11:47 AM CDT	Severe Thunderstorm Warning	ILX	Knox	43 min
Jun 11, 1:52 PM CDT	Severe Thunderstorm Warning	EAX	Grundy, Mercer, Putnam, Schuyler, Sullivan	53 min
Jun 11, 2:42 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Putnam, Schuyler, Sullivan	63 min
Jun 11, 2:56 PM CDT	Flash Flood Warning	DVN	Dubuque	4 hr

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, 0.5 hours before the alert went out and 108 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: 11 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: -15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 10, 7:06 PM CDT	Tornado Watch	SPC	Bureau, Cass, DeKalb, DeWitt, Fulton, Grundy and 17 more	4 hr
Jun 10, 7:55 PM CDT	Mesoscale Discussion	SPC	Cook, DeKalb, DuPage, Ford, Fulton, Grundy and 14 more	95 min
Jun 10, 8:24 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Clark, Coles, Cumberland and 19 more	6 hr
Jun 10, 9:22 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Fulton, Hancock, McDonough, Schuyler	83 min
Jun 11, 12:00 AM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more	90 min
Jun 11, 9:53 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Fulton, Hancock and 20 more	97 min
Jun 11, 12:22 PM CDT	Mesoscale Discussion	SPC	Bureau, Cass, Fulton, Grundy, Kendall, Knox and 12 more	83 min
Jun 11, 1:08 PM CDT	Mesoscale Discussion	SPC	Hancock, Henderson	3 hr
Jun 11, 1:57 PM CDT	Tornado Watch	SPC	Adams, Boone, Brown, Bureau, Carroll, Cass and 45 more	7 hr
Jun 11, 2:47 PM CDT	Severe Thunderstorm Watch	SPC	Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 1 more	8 hr
Jun 11, 3:07 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 7 more	113 min
Jun 11, 4:11 PM CDT	Mesoscale Discussion	SPC	Fulton, Hancock, Henderson, Henry, Knox, McDonough and 3 more	94 min
Jun 11, 5:13 PM CDT	Mesoscale Discussion	SPC	Grundy, Kankakee, LaSalle, Marshall, Will	62 min
Jun 11, 6:14 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Cass, Cook, DeKalb, DeWitt and 27 more	91 min
Jun 11, 6:38 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Coles, DeWitt, Douglas, Edgar and 6 more	97 min
Jun 11, 1:51 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 10 more	114 min
Jun 11, 2:13 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 40 more	8 hr
Jun 11, 4:59 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Clarke, Decatur and 13 more	2 hr
Jun 11, 6:33 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 17 more	87 min
Jun 10, 8:24 PM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan, Clay, Clinton, Daviess, DeKalb and 3 more	96 min
Jun 11, 1:18 PM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Carroll, Cass, Cedar and 20 more	117 min
Jun 11, 5:56 PM CDT	Mesoscale Discussion	SPC	Jasper, McDonald, Newton	94 min

Nearby

Tornado Watches in Iowa, 2026 Tornado Watches in Illinois, 2026 Tornado Watches in Missouri, 2026 Every tornado watch in 2026

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.