Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 115, NWS Lincoln, IL

October 11, 20216 counties in Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Oct 11, 2021, 5:42 PM CDT for 6 counties in Illinois. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 11, 2021, 5:42 PM CDT (22:42 UTC)
Expired: Oct 11, 2021, 6:45 PM CDT
In force: 63 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Champaign County, IL, DeWitt County, IL, Douglas County, IL, Macon County, IL, McLean County, IL, Piatt County, IL

The radar

The Lincoln radar (KILX), 71 km from the middle of the area, began a volume at 22:41 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 was reported inside it

Time	Report	Where	Remark
Oct 11, 5:52 PM CDT	TSTM WND DMG	1 S Arrowsmith, IL	DAMAGE TO AN OUTBUILDING WITH WOOD AND SHEET METAL STREWN DOWNWIND. CORN NEXT TO SHED AND UP THE ROAD IS FLATTENED AS WELL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Oct 11, 3:10 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.7 hours before the alert went out and 9 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: 287 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

424 
WUUS53 KILX 112242
SVRILX
ILC019-039-041-113-115-147-112345-
/O.NEW.KILX.SV.W.0115.211011T2242Z-211011T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
542 PM CDT Mon Oct 11 2021

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Piatt County in central Illinois...
  Northeastern De Witt County in central Illinois...
  Southeastern McLean County in central Illinois...
  Champaign County in east central Illinois...
  Northern Douglas County in east central Illinois...
  East central Macon County in central Illinois...

* Until 645 PM CDT.

* At 541 PM CDT, severe thunderstorms were located along a line
  extending from near Le Roy to near De Land to near Cerro Gordo,
  moving northeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Le Roy and Farmer City around 545 PM CDT.
  Mansfield around 550 PM CDT.
  Mahomet and Saybrook around 555 PM CDT.
  Monticello around 600 PM CDT.

Other locations in the path of these severe thunderstorms include
Fisher, White Heath, Tolono, Seymour, Savoy, Bondville, Champaign and
Lake Of The Woods.

This includes the following highways...
 Interstate 57 between mile markers 214 and 257.
 Interstate 72 between mile markers 157 and 182.
 Interstate 74 between mile markers 144 and 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for central and
east central Illinois.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 900 PM CDT for central and
east central Illinois.

&&

LAT...LON 3980 8877 4009 8872 4039 8887 4048 8846
      4040 8846 4040 8797 3984 8797
TIME...MOT...LOC 2241Z 228DEG 41KT 4041 8873 4016 8862 3986 8869 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Shimon

5 follow-up statements

023 
WWUS53 KILX 112255
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
555 PM CDT Mon Oct 11 2021

ILC115-112305-
/O.CAN.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Macon-
555 PM CDT Mon Oct 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MACON COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for central and
east central Illinois.

LAT...LON 3981 8862 4026 8858 4043 8867 4048 8846
      4040 8846 4040 8797 3984 8797
TIME...MOT...LOC 2255Z 228DEG 41KT 4051 8858 4026 8847 3996 8854 

$$

ILC019-039-041-113-147-112345-
/O.CON.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Piatt-De Witt-McLean-Champaign-Douglas-
555 PM CDT Mon Oct 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR EASTERN PIATT...NORTHEASTERN DE WITT...SOUTHEASTERN MCLEAN...
CHAMPAIGN AND NORTHERN DOUGLAS COUNTIES...

At 555 PM CDT, severe thunderstorms were located along a line
extending from near Colfax to near Mansfield to near Bement, moving
northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Saybrook around 600 PM CDT.

Other locations in the path of these severe thunderstorms include
Fisher, Tolono, Seymour, Savoy, Bondville, Champaign, Urbana, Lake Of
The Woods, Thomasboro, Rantoul and Gifford.

This includes the following highways...
 Interstate 57 between mile markers 215 and 257.
 Interstate 72 between mile markers 164 and 182.
 Interstate 74 between mile markers 162 and 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for central and
east central Illinois.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3981 8862 4026 8858 4043 8867 4048 8846
      4040 8846 4040 8797 3984 8797
TIME...MOT...LOC 2255Z 228DEG 41KT 4051 8858 4026 8847 3996 8854 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Shimon

398 
WWUS53 KILX 112313
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
613 PM CDT Mon Oct 11 2021

ILC039-113-147-112322-
/O.CAN.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Piatt-De Witt-McLean-
613 PM CDT Mon Oct 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PIATT...NORTHEASTERN
DE WITT AND SOUTHEASTERN MCLEAN COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for east central
Illinois.

LAT...LON 3982 8846 4004 8846 4033 8841 4040 8840
      4040 8797 3984 8797
TIME...MOT...LOC 2312Z 228DEG 41KT 4064 8840 4039 8829 4009 8836 

$$

ILC019-041-112345-
/O.CON.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Champaign-Douglas-
613 PM CDT Mon Oct 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR CHAMPAIGN AND NORTHERN DOUGLAS COUNTIES...

At 612 PM CDT, severe thunderstorms were located along a line
extending from 7 miles south of Forrest to near Fisher to near
Bondville, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Thomasboro, Rantoul and Gifford.

This includes the following highways...
 Interstate 57 between mile markers 215 and 257.
 Interstate 72 between mile markers 175 and 182.
 Interstate 74 between mile markers 170 and 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for east central
Illinois.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3982 8846 4004 8846 4033 8841 4040 8840
      4040 8797 3984 8797
TIME...MOT...LOC 2312Z 228DEG 41KT 4064 8840 4039 8829 4009 8836 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Shimon

372 
WWUS53 KILX 112317
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
617 PM CDT Mon Oct 11 2021

ILC019-041-112345-
/O.CON.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Champaign-Douglas-
617 PM CDT Mon Oct 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR CHAMPAIGN AND NORTHERN DOUGLAS COUNTIES...

At 616 PM CDT, severe thunderstorms were located along a line
extending from near Fisher to near Seymour to near Atwood, moving
northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Champaign, Rantoul, Urbana, Savoy, Mahomet, St. Joseph, Tolono, Villa
Grove, Fisher, Philo, Sidney, Thomasboro, Gifford, Pesotum,
Bondville, Broadlands, Lake Of The Woods, Seymour, Sadorus and
Ludlow.

This includes the following highways...
 Interstate 57 between mile markers 215 and 257.
 Interstate 72 between mile markers 175 and 182.
 Interstate 74 between mile markers 170 and 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for east central
Illinois.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3982 8846 4004 8846 4033 8841 4040 8840
      4040 8797 3984 8797
TIME...MOT...LOC 2316Z 219DEG 37KT 4037 8837 4007 8841 3986 8841 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Shimon

987 
WWUS53 KILX 112331
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
631 PM CDT Mon Oct 11 2021

ILC019-041-112345-
/O.CON.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Champaign-Douglas-
631 PM CDT Mon Oct 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR CHAMPAIGN AND NORTHERN DOUGLAS COUNTIES...

At 631 PM CDT, severe thunderstorms were located along a line
extending from 6 miles northwest of Rantoul to Savoy to near Pesotum,
moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Champaign, Rantoul, Urbana, Savoy, St. Joseph, Tolono, Villa Grove,
Philo, Sidney, Thomasboro, Gifford, Pesotum, Broadlands, Sadorus,
Ludlow, Royal, Longview, Dewey, Flatville and Willard Airport.

This includes the following highways...
 Interstate 57 between mile markers 215 and 257.
 Interstate 74 between mile markers 178 and 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for east central
Illinois.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3983 8837 4007 8831 4040 8828 4040 8797
      3984 8797
TIME...MOT...LOC 2331Z 223DEG 35KT 4037 8824 4008 8826 3986 8833 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Shimon

672 
WWUS53 KILX 112343
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
643 PM CDT Mon Oct 11 2021

ILC019-041-112351-
/O.EXP.KILX.SV.W.0115.000000T0000Z-211011T2345Z/
Champaign-Douglas-
643 PM CDT Mon Oct 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR CHAMPAIGN AND NORTHERN DOUGLAS
COUNTIES WILL EXPIRE AT 645 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Tornado Watch remains in effect until 900 PM CDT for east central
Illinois.

LAT...LON 3983 8837 4007 8831 4040 8828 4040 8797
      3984 8797
TIME...MOT...LOC 2341Z 228DEG 41KT 4044 8814 4015 8816 3993 8823 

$$

Shimon

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 12:00 PM CDT	Special Weather Statement	ILX	Morgan	30 min
Oct 11, 12:55 PM CDT	Special Weather Statement	ILX	Sangamon	35 min
Oct 11, 2:08 PM CDT	Special Weather Statement	ILX	Schuyler, Scott	37 min
Oct 11, 2:27 PM CDT	Special Weather Statement	ILX	Crawford, Lawrence, Richland	33 min
Oct 11, 2:50 PM CDT	Tornado Warning Tornado observed	ILX	Morgan	25 min
Oct 11, 3:12 PM CDT	Tornado Warning	ILX	Morgan, Sangamon	33 min
Oct 11, 3:32 PM CDT	Tornado Warning Tornado observed	ILX	Cass, Menard, Morgan, Sangamon	30 min
Oct 11, 3:50 PM CDT	Tornado Warning Tornado observed	ILX	Fulton, Mason, Tazewell	25 min
Oct 11, 4:21 PM CDT	Tornado Warning	ILX	Logan, Mason	24 min
Oct 11, 4:47 PM CDT	Tornado Warning Tornado observed	ILX	Marshall, Woodford	28 min
Oct 11, 4:56 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Logan, Macon, Piatt	49 min
Oct 11, 5:03 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Logan, McLean, Macon, Piatt	42 min
Oct 11, 5:14 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	61 min
Oct 11, 5:38 PM CDT	Tornado Warning	ILX	Woodford	20 min
Oct 11, 6:52 PM CDT	Special Weather Statement	ILX	Champaign, Douglas, Vermilion	83 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.