Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 20, NWS St. Louis, MO

October 11, 2021Greene County, Illinois

NWS St. Louis, MO issued this tornado warning at Oct 11, 2021, 2:38 PM CDT for Greene County, Illinois. It was in force for 21 min. 2 reports 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, 2:38 PM CDT (19:38 UTC)
Expired: Oct 11, 2021, 2:59 PM CDT
In force: 21 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Greene County, IL

The radar

The St Louis radar (KLSX), 88 km from the middle of the area, began a volume at 19:39 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, 2:38 PM CDT	TORNADO	Wrights, IL	SEVERAL VIDEOS OF A TORNADO HITTING A FARM IN WRIGHTS. TIME ESTIMATED FROM RADAR.
Oct 11, 2:47 PM CDT	TORNADO	3 Wnw Athensville, IL	TORNADO ON THE GROUND WEST NORTHWEST OF ATHENSVILLE. SPOTTER WAS ON EAST SIDE OF ROODHOUSE LOOKING EAST AT IT.

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, 7.6 hours before the alert went out and 164 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.

916 
WFUS53 KLSX 111938
TORLSX
ILC061-112015-
/O.NEW.KLSX.TO.W.0020.211011T1938Z-211011T2015Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northeastern Greene County in southwestern Illinois...

* Until 315 PM CDT.
    
* At 237 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Athensville, moving north at 35 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 tornadic thunderstorm will remain over mainly rural areas of
  northeastern Greene County, including the following locations...
  Wrights.

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 3934 9027 3938 9035 3952 9031 3952 9015
TIME...MOT...LOC 1937Z 199DEG 30KT 3941 9028 

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

$$

Glass

3 follow-up statements

396 
WWUS53 KLSX 111946
SVSLSX

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

ILC061-112015-
/O.CON.KLSX.TO.W.0020.000000T0000Z-211011T2015Z/
Greene IL-
246 PM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR
NORTHEASTERN GREENE COUNTY...
        
At 245 PM CDT, a confirmed tornado was located near Athensville,
moving north at 30 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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 tornadic thunderstorm will remain over mainly rural areas of
northeastern Greene County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3940 9025 3943 9031 3952 9031 3952 9015
TIME...MOT...LOC 1945Z 199DEG 25KT 3944 9026 

TORNADO...OBSERVED
MAX HAIL SIZE...0.00 IN

$$

Glass

671 
WWUS53 KLSX 111951
SVSLSX

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

ILC061-112015-
/O.CON.KLSX.TO.W.0020.000000T0000Z-211011T2015Z/
Greene IL-
251 PM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR
NORTHEASTERN GREENE COUNTY...
        
At 251 PM CDT, a confirmed tornado was located near Athensville,
moving north at 35 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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 tornadic thunderstorm will remain over mainly rural areas of
northeastern Greene County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3944 9022 3947 9028 3952 9028 3952 9016
TIME...MOT...LOC 1951Z 199DEG 30KT 3949 9024 

TORNADO...OBSERVED
MAX HAIL SIZE...0.00 IN

$$

Glass

566 
WWUS53 KLSX 111959
SVSLSX

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

ILC061-112009-
/O.CAN.KLSX.TO.W.0020.000000T0000Z-211011T2015Z/
Greene IL-
259 PM CDT Mon Oct 11 2021

...THE TORNADO WARNING FOR NORTHEASTERN GREENE COUNTY IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 3944 9022 3947 9028 3952 9028 3952 9016
TIME...MOT...LOC 1958Z 199DEG 30KT 3956 9021 

$$

Glass

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 1:02 PM CDT	Tornado Warning	LSX	Bond, Macoupin, Madison, Montgomery	28 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.