Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 19, NWS St. Louis, MO

October 11, 20214 counties in Illinois

NWS St. Louis, MO issued this tornado warning at Oct 11, 2021, 1:02 PM CDT for 4 counties in Illinois. It was in force for 28 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, 1:02 PM CDT (18:02 UTC)
Expired: Oct 11, 2021, 1:30 PM CDT
In force: 28 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Bond County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 85 km from the middle of the area, began a volume at 18:06 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 was reported inside it

Time	Report	Where	Remark
Oct 11, 1:05 PM CDT	FUNNEL CLOUD	2 Wnw Saint Jacob, IL	SPOTTER IS AT ST LOUIS METRO-EAST/SHAFER FIELD LOOKING TO THE NORTH AND COULD SEE FUNNEL. THE FUNNEL DID NOT TOUCH DOWN.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.0 hours before the alert went out and 170 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.

347 
WFUS53 KLSX 111802
TORLSX
ILC005-117-119-135-111845-
/O.NEW.KLSX.TO.W.0019.211011T1802Z-211011T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
102 PM CDT Mon Oct 11 2021

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northwestern Bond County in south central Illinois...
  Eastern Madison County in southwestern Illinois...
  Southeastern Macoupin County in southwestern Illinois...
  Southwestern Montgomery County in south central Illinois...

* Until 145 PM CDT.
    
* At 102 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Marine, moving northeast at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Marine around 105 PM CDT.
  Worden and Alhambra around 115 PM CDT.
  Livingston around 120 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Staunton, Mount Olive, Sorento, Taylor Springs, Litchfield, Hillsboro
and Schram City.

This also includes Lake Lou Yaeger.
 
This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 24.
 Interstate 55 in Illinois between exits 30 and 52.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3867 8981 3871 8993 3925 8970 3919 8940
TIME...MOT...LOC 1802Z 204DEG 41KT 3876 8982 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Glass

4 follow-up statements

857 
WWUS53 KLSX 111810
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
110 PM CDT Mon Oct 11 2021

ILC005-117-119-135-111845-
/O.CON.KLSX.TO.W.0019.000000T0000Z-211011T1845Z/
Bond IL-Madison IL-Macoupin IL-Montgomery IL-
110 PM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR
NORTHWESTERN BOND COUNTY IN SOUTH CENTRAL ILLINOIS...NORTHEASTERN
MADISON...SOUTHEASTERN MACOUPIN COUNTIES IN SOUTHWESTERN ILLINOIS AND
SOUTHWESTERN MONTGOMERY COUNTIES IN SOUTH CENTRAL ILLINOIS...
    
At 110 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Marine, moving north at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Alhambra around 115 PM CDT.
  Worden around 120 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Livingston, Staunton, Sorento, Mount Olive, Taylor Springs,
Litchfield, Hillsboro and Schram City.

This also includes Lake Lou Yaeger.
 
This includes the following highways...
 Interstate 70 in Illinois near exit 24.
 Interstate 55 in Illinois between exits 30 and 52.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3875 8976 3884 8987 3925 8970 3919 8940
TIME...MOT...LOC 1810Z 202DEG 38KT 3883 8979 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Glass

736 
WWUS53 KLSX 111821
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
121 PM CDT Mon Oct 11 2021

ILC005-111830-
/O.CAN.KLSX.TO.W.0019.000000T0000Z-211011T1845Z/
Bond IL-
121 PM CDT Mon Oct 11 2021

...THE TORNADO WARNING FOR NORTHWESTERN BOND COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 3888 8975 3892 8980 3925 8970 3918 8947
TIME...MOT...LOC 1820Z 204DEG 41KT 3894 8972 

$$

ILC117-119-135-111845-
/O.CON.KLSX.TO.W.0019.000000T0000Z-211011T1845Z/
Madison IL-Macoupin IL-Montgomery IL-
121 PM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR
NORTHEASTERN MADISON...SOUTHEASTERN MACOUPIN COUNTIES IN SOUTHWESTERN
ILLINOIS AND SOUTHWESTERN MONTGOMERY COUNTIES IN SOUTH CENTRAL
ILLINOIS...
    
At 120 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Livingston, moving northeast at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Mount Olive around 130 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Litchfield and Hillsboro.

This includes Interstate 55 in Illinois between exits 37 and 41, and
near exit 52.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3888 8975 3892 8980 3925 8970 3918 8947
TIME...MOT...LOC 1820Z 204DEG 41KT 3894 8972 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Glass

529 
WWUS53 KLSX 111829
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
129 PM CDT Mon Oct 11 2021

ILC119-111838-
/O.CAN.KLSX.TO.W.0019.000000T0000Z-211011T1845Z/
Madison IL-
129 PM CDT Mon Oct 11 2021

...THE TORNADO WARNING FOR NORTHEASTERN MADISON COUNTY IN
SOUTHWESTERN ILLINOIS IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has weakened 
and moved out of the warned area. Therefore, the warning has been 
cancelled.

LAT...LON 3900 8967 3900 8976 3917 8970 3913 8957
TIME...MOT...LOC 1828Z 199DEG 37KT 3902 8970 

$$

ILC117-135-111845-
/O.CON.KLSX.TO.W.0019.000000T0000Z-211011T1845Z/
Macoupin IL-Montgomery IL-
129 PM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR
SOUTHEASTERN MACOUPIN AND SOUTHWESTERN MONTGOMERY COUNTIES...
    
At 128 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Mount Olive, moving north at 40 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
  Litchfield.

This includes Interstate 55 in Illinois near exit 41.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3900 8967 3900 8976 3917 8970 3913 8957
TIME...MOT...LOC 1828Z 199DEG 37KT 3902 8970 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Glass

152 
WWUS53 KLSX 111830
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
130 PM CDT Mon Oct 11 2021

ILC117-135-111840-
/O.CAN.KLSX.TO.W.0019.000000T0000Z-211011T1845Z/
Macoupin IL-Montgomery IL-
130 PM CDT Mon Oct 11 2021

...THE TORNADO WARNING FOR SOUTHEASTERN MACOUPIN AND SOUTHWESTERN
MONTGOMERY COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

LAT...LON 3900 8967 3900 8976 3917 8970 3913 8957
TIME...MOT...LOC 1829Z 204DEG 41KT 3904 8969 

$$

Glass

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 11, 2:38 PM CDT	Tornado Warning	LSX	Greene	21 min

Nearby

Tornado Warnings in Illinois, 2021 Every tornado warning in 2021 Tornadoes 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.