Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 39, NWS Lincoln, IL

October 11, 2021Logan County, Mason County, Illinois

NWS Lincoln, IL issued this tornado warning at Oct 11, 2021, 4:21 PM CDT for Logan County, Mason County, Illinois. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 11, 2021, 4:21 PM CDT (21:21 UTC)
Expired: Oct 11, 2021, 4:45 PM CDT
In force: 24 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Logan County, IL, Mason County, IL

The radar

The Lincoln radar (KILX), 21 km from the middle of the area, began a volume at 21:24 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
Oct 11, 3:10 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.4 hours before the alert went out and 82 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.

502 
WFUS53 KILX 112121
TORILX
ILC107-125-112145-
/O.NEW.KILX.TO.W.0039.211011T2121Z-211011T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Lincoln IL
421 PM CDT Mon Oct 11 2021

The National Weather Service in Lincoln has issued a

* Tornado Warning for...
  Northwestern Logan County in central Illinois...
  East central Mason County in central Illinois...

* Until 445 PM CDT.
    
* At 421 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Mason City, moving northeast at 30 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...
  Hartsburg around 440 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Emden.

This includes Interstate 155 between mile markers 6 and 10.
 
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 4015 8962 4019 8970 4032 8958 4032 8931
TIME...MOT...LOC 2121Z 226DEG 26KT 4019 8963 

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

$$

Shimon

2 follow-up statements

695 
WWUS53 KILX 112131
SVSILX

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

ILC125-112141-
/O.CAN.KILX.TO.W.0039.000000T0000Z-211011T2145Z/
Mason-
431 PM CDT Mon Oct 11 2021

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

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

LAT...LON 4019 8960 4029 8960 4032 8958 4032 8931
TIME...MOT...LOC 2131Z 226DEG 26KT 4024 8956 

$$

ILC107-112145-
/O.CON.KILX.TO.W.0039.000000T0000Z-211011T2145Z/
Logan-
431 PM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR
NORTHWESTERN LOGAN COUNTY...
    
At 431 PM CDT, a severe thunderstorm capable of producing a tornado
was located near San Jose, or 7 miles east of Mason City, moving
northeast at 30 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...
  Emden.

This includes Interstate 155 between mile markers 7 and 10.
 
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 4019 8960 4029 8960 4032 8958 4032 8931
TIME...MOT...LOC 2131Z 226DEG 26KT 4024 8956 

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

$$

Shimon

581 
WWUS53 KILX 112141
SVSILX

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

ILC107-112150-
/O.EXP.KILX.TO.W.0039.000000T0000Z-211011T2145Z/
Logan-
441 PM CDT Mon Oct 11 2021

...THE TORNADO WARNING FOR NORTHWESTERN LOGAN COUNTY WILL EXPIRE AT
445 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

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

LAT...LON 4019 8960 4029 8960 4032 8958 4032 8931
TIME...MOT...LOC 2140Z 226DEG 26KT 4027 8951 

$$

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, 4:47 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, 5:42 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, DeWitt, Douglas, McLean, Macon, Piatt	63 min
Oct 11, 6:52 PM CDT	Special Weather Statement	ILX	Champaign, Douglas, Vermilion	83 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.