Alert archive / Illinois / Tornado Warnings in 2025

Tornado Warning 52, NWS St. Louis, MO

April 20, 2025Randolph County, Saint Clair County, Washington County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 20, 2025, 8:32 PM CDT for Randolph County, Saint Clair County, Washington 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 outline as issued.

The facts

Issued: Apr 20, 2025, 8:32 PM CDT (01:32 UTC)
Expired: Apr 20, 2025, 9:15 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Randolph County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 107 km from the middle of the area, began a volume at 01:31 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
Apr 20, 3:41 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.5 hours before the alert went out and 219 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: 182 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 1336 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 377 m²/s²
0-3 km storm-relative helicity: 580 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

751 
WFUS53 KLSX 210132
TORLSX
ILC157-163-189-210215-
/O.NEW.KLSX.TO.W.0052.250421T0132Z-250421T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
832 PM CDT Sun Apr 20 2025

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Washington County in south central Illinois...
  Northeastern Randolph County in southwestern Illinois...
  Southeastern Saint Clair County in southwestern Illinois...

* Until 915 PM CDT.

* At 832 PM CDT, a severe thunderstorm capable of producing a 
  tornado was located near Sparta, moving northeast at 55 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...
  Sparta, Nashville, New Athens, Marissa, Okawville, Wamac, 
  Coulterville, Tilden, Lively Grove, Irvington, Ashley, Posen, 
  Eden, St. Libory, Beaucoup, Hoyleton, Lenzburg, Johannisburg, 
  Covington and Richview.

This includes Interstate 64 in Illinois between exits 41 and 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built 
building away from 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.

Tornadoes are difficult to observe at night. Take cover now!

&&

LAT...LON 3822 8989 3830 8991 3848 8958 3847 8948
      3850 8943 3849 8941 3850 8937 3852 8935
      3850 8914 3832 8915 3821 8938 3822 8959
      3813 8959 3808 8970 3817 8974 3822 8979
TIME...MOT...LOC 0132Z 226DEG 47KT 3817 8978

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

$$

Elmore

3 follow-up statements

741 
WWUS53 KLSX 210149
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
849 PM CDT Sun Apr 20 2025

ILC157-163-210159-
/O.CAN.KLSX.TO.W.0052.000000T0000Z-250421T0215Z/
Randolph IL-Saint Clair IL-
849 PM CDT Sun Apr 20 2025

...TORNADO WARNING IS CANCELLED FOR NORTHEASTERN RANDOLPH AND 
SOUTHEASTERN SAINT CLAIR COUNTIES...

The storm which prompted the warning has moved out of the area. 
Therefore, the warning has been cancelled. However, gusty winds are 
still possible with this thunderstorm.

&&

LAT...LON 3848 8958 3847 8948 3850 8943 3849 8941
      3850 8937 3852 8935 3850 8914 3832 8915
      3821 8937 3822 8970 3841 8970
TIME...MOT...LOC 0132Z 226DEG 47KT 3817 8978

$$


ILC189-210215-
/O.CON.KLSX.TO.W.0052.000000T0000Z-250421T0215Z/
Washington IL-
849 PM CDT Sun Apr 20 2025

...TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR WASHINGTON 
COUNTY IN SOUTH CENTRAL ILLINOIS...

At 849 PM CDT, a severe thunderstorm capable of producing a tornado 
was located over Lively Grove, or 12 miles west of Nashville, moving 
northeast at 50 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...
  Nashville, Okawville, Wamac, Tilden, Lively Grove, Irvington, 
  Ashley, Posen, Beaucoup, Hoyleton, Johannisburg, Covington, 
  Richview, Addieville, Oakdale, New Minden, Venedy, Cordes, 
  Frogtown and Huegely.

This includes Interstate 64 in Illinois between exits 41 and 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built 
building away from 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.

Tornadoes are difficult to observe at night. Take cover now!

&&

LAT...LON 3848 8958 3847 8948 3850 8943 3849 8941
      3850 8937 3852 8935 3850 8914 3832 8915
      3821 8937 3822 8970 3841 8970
TIME...MOT...LOC 0132Z 229DEG 42KT 3817 8978

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN

$$

Elmore

741 
WWUS53 KLSX 210202
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
902 PM CDT Sun Apr 20 2025

ILC189-210215-
/O.CON.KLSX.TO.W.0052.000000T0000Z-250421T0215Z/
Washington IL-
902 PM CDT Sun Apr 20 2025

...TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR WASHINGTON 
COUNTY IN SOUTH CENTRAL ILLINOIS...

At 902 PM CDT, a severe thunderstorm capable of producing a tornado 
was located near Nashville, 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.

Locations impacted include...
  Nashville, Okawville, Wamac, Irvington, Ashley, Posen, Beaucoup, 
  Hoyleton, Covington, Richview, Addieville, Oakdale, New Minden, 
  Huegely, Cordes and Frogtown.

This includes Interstate 64 in Illinois between exits 41 and 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built 
building away from 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.

Tornadoes are difficult to observe at night. Take cover now!

&&

LAT...LON 3849 8941 3850 8937 3852 8935 3851 8930
      3850 8914 3832 8915 3821 8936 3822 8949
      3848 8954 3847 8948 3850 8943
TIME...MOT...LOC 0149Z 233DEG 40KT 3822 8956

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN

$$

Elmore

650 
WWUS53 KLSX 210214
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
914 PM CDT Sun Apr 20 2025

ILC189-210224-
/O.EXP.KLSX.TO.W.0052.000000T0000Z-250421T0215Z/
Washington IL-
914 PM CDT Sun Apr 20 2025

...TORNADO WARNING WILL EXPIRE AT 915 PM CDT FOR WASHINGTON COUNTY 
IN SOUTH CENTRAL ILLINOIS...

The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, large hail and damaging winds remain likely and 
a Severe Thunderstorm Warning remains in effect for the area. 
However, small hail and gusty winds are still possible with this 
thunderstorm.

A Tornado Watch remains in effect until 1100 PM CDT for a portion of 
south central Illinois.

&&

LAT...LON 3849 8941 3850 8937 3852 8935 3851 8930
      3850 8914 3832 8915 3821 8936 3822 8949
      3848 8954 3847 8948 3850 8943
TIME...MOT...LOC 0202Z 233DEG 40KT 3830 8941

$$

Elmore

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:14 PM CDT	Severe Thunderstorm Warning	LSX	Adams	16 min
Apr 20, 7:43 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	47 min
Apr 20, 7:53 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	52 min
Apr 20, 7:56 PM CDT	Tornado Warning	LSX	Randolph	49 min
Apr 20, 8:03 PM CDT	Tornado Warning	LSX	Monroe, Saint Clair	42 min
Apr 20, 8:38 PM CDT	Tornado Warning	LSX	Bond, Clinton, Madison, Saint Clair	38 min
Apr 20, 9:12 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	35 min

Nearby

Tornado Warnings in Illinois, 2025 Every tornado warning in 2025 Tornadoes in 2025

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.