Alert archive / Illinois / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 240, NWS Lincoln, IL

June 11, 2026Knox County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 11, 2026, 11:47 AM CDT for Knox County, Illinois. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 11, 2026, 11:47 AM CDT (16:47 UTC)
Expired: Jun 11, 2026, 12:30 PM CDT
In force: 43 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Knox County, IL

The radar

The Quad Cities radar (KDVN), 82 km from the middle of the area, began a volume at 16:48 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 7:31 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 4.8 hours before the alert went out and 80 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

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 11, 6:12 AM CDT, 5 hours 35 minutes earlier.

Area forecast discussion, Jun 11, 6:12 AM CDT, 5 hours 35 minutes before

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Hazardous weather outlook, Jun 11, 5:24 AM CDT, 6 hours 23 minutes before

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In the hours before

Local storm report, Jun 11, 5:54 AM CDT, 5 hours 53 minutes before

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Local storm report, Jun 11, 5:56 AM CDT, 5 hours 51 minutes before

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Local storm report, Jun 11, 5:59 AM CDT, 5 hours 48 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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Local storm report, Jun 11, 6:17 AM CDT, 5 hours 30 minutes before

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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 10, 7:24 PM CDT	Severe Thunderstorm Warning	ILX	Knox, Marshall, Peoria, Stark	66 min
Jun 10, 8:07 PM CDT	Flash Flood Warning	ILX	Knox, Peoria, Stark	3 hr
Jun 10, 8:37 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Marshall, Tazewell, Woodford	38 min
Jun 10, 8:53 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox	52 min
Jun 10, 9:14 PM CDT	Flash Flood Warning	ILX	Fulton, Knox, Marshall, Peoria, Stark, Woodford	5 hr
Jun 10, 10:00 PM CDT	Flash Flood Warning	ILX	Fulton, Mason, Peoria, Tazewell	4 hr
Jun 10, 10:36 PM CDT	Severe Thunderstorm Warning	ILX	Mason, Tazewell	24 min
Jun 10, 10:46 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Tazewell	44 min
Jun 10, 10:58 PM CDT	Tornado Warning	ILX	Logan, Macon, Menard, Sangamon	36 min
Jun 10, 11:05 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Logan, McLean, Macon, Mason, Menard and 1 more	40 min
Jun 10, 11:12 PM CDT	Tornado Warning Tornado observed	ILX	Christian, Logan, Macon, Sangamon	34 min
Jun 10, 11:14 PM CDT	Tornado Warning	ILX	DeWitt, Logan	16 min
Jun 10, 11:28 PM CDT	Tornado Warning	ILX	Logan, Macon, Piatt	47 min
Jun 10, 11:30 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Cumberland, Logan, Macon, Moultrie, Piatt and 2 more	60 min
Jun 10, 11:39 PM CDT	Tornado Warning	ILX	Christian, Macon, Moultrie, Shelby	35 min
Jun 10, 11:45 PM CDT	Tornado Warning	ILX	Christian, Macon, Moultrie, Piatt, Shelby	28 min
Jun 10, 11:46 PM CDT	Flash Flood Warning	ILX	McLean, Tazewell, Woodford	4 hr
Jun 10, 11:48 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, DeWitt, McLean, Macon, Piatt	57 min
Jun 10, 11:51 PM CDT	Tornado Warning Tornado observed	ILX	DeWitt, Piatt	25 min
Jun 11, 12:09 AM CDT	River Flood Warning	ILX	Fulton, Knox	60 hr
Jun 11, 12:12 AM CDT	Tornado Warning	ILX	Champaign, Douglas	19 min
Jun 11, 12:19 AM CDT	Severe Thunderstorm Warning	ILX	Champaign, Douglas, Moultrie, Piatt	24 min
Jun 11, 2:11 AM CDT	Flash Flood Warning	ILX	Sangamon	3 hr
Jun 11, 2:32 AM CDT	Flash Flood Warning	ILX	Macon	56 min
Jun 11, 6:17 AM CDT	River Flood Warning	ILX	McLean, Tazewell, Woodford	16 hr
Jun 11, 11:37 AM CDT	River Flood Warning	ILX	Cass, Fulton, Mason	37 days
Jun 11, 11:38 AM CDT	River Flood Warning	ILX	Brown, Cass, Morgan, Schuyler	38 days
Jun 11, 11:39 AM CDT	Flood Watch	ILX	Cass, DeWitt, Fulton, Knox, Logan, McLean and 8 more	9 hr
Jun 11, 12:34 PM CDT	Special Weather Statement	ILX	Knox	26 min
Jun 11, 1:04 PM CDT	Special Weather Statement	ILX	Peoria	26 min
Jun 11, 4:49 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Woodford	41 min
Jun 11, 4:56 PM CDT	Tornado Warning	ILX	Marshall, Peoria, Woodford	36 min
Jun 11, 5:11 PM CDT	Tornado Warning EmergencyTornado observedCatastrophic damage threat	ILX	Marshall	14 min
Jun 11, 5:12 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox, Peoria	48 min
Jun 11, 5:15 PM CDT	Tornado Warning	ILX	Woodford	14 min
Jun 11, 5:19 PM CDT	Tornado Warning	ILX	Fulton, Mason, Tazewell	41 min
Jun 11, 5:30 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Schuyler	60 min
Jun 11, 5:31 PM CDT	Tornado Warning	ILX	Fulton, Peoria	31 min
Jun 11, 5:40 PM CDT	Flash Flood Warning	ILX	Fulton, Peoria	5 hr
Jun 11, 5:49 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Mason, Peoria, Tazewell	41 min
Jun 11, 5:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Cass, Mason, Menard	39 min
Jun 11, 5:59 PM CDT	Tornado Warning	ILX	Cass, Mason, Schuyler	31 min
Jun 11, 6:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	McLean, Tazewell, Woodford	65 min
Jun 11, 6:14 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	DeWitt, Logan, Macon	61 min
Jun 11, 6:15 PM CDT	Tornado Warning	ILX	Tazewell, Woodford	17 min
Jun 11, 6:30 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Cass, Mason, Menard, Morgan, Sangamon	45 min
Jun 11, 6:34 PM CDT	Tornado Warning	ILX	McLean	10 min
Jun 11, 6:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Champaign, DeWitt, McLean, Macon, Piatt	60 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2026 Every severe thunderstorm warning 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.