Alert archive / Illinois / Tornado Warnings in 2026

Tornado Warning 55, NWS St. Louis, MO

April 27, 2026Marion County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 27, 2026, 8:44 PM CDT for Marion County, Illinois. It was in force for 17 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 27, 2026, 8:44 PM CDT (01:44 UTC)
Expired: Apr 27, 2026, 9:01 PM CDT
In force: 17 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Marion County, IL

The radar

The Evansville,IN radar (KVWX), 100 km from the middle of the area, began a volume at 01:46 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 27, 12:50 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.7 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: -57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

126 
WFUS53 KLSX 280144
TORLSX
ILC121-280230-
/O.NEW.KLSX.TO.W.0055.260428T0144Z-260428T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
844 PM CDT Mon Apr 27 2026

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northeastern Marion County in south central Illinois...

* Until 930 PM CDT.

* At 844 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Salem, moving east at 55 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Omega and Stephen Forbes Station.

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.

&&

LAT...LON 3857 8876 3882 8880 3883 8870 3857 8870
TIME...MOT...LOC 0144Z 265DEG 48KT 3866 8890

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

$$

Elmore

1 follow-up statement

764 
WWUS53 KLSX 280201
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
901 PM CDT Mon Apr 27 2026

ILC121-280211-
/O.CAN.KLSX.TO.W.0055.000000T0000Z-260428T0230Z/
Marion IL-
901 PM CDT Mon Apr 27 2026

...TORNADO WARNING IS CANCELLED FOR NORTHEASTERN MARION COUNTY IN
SOUTH CENTRAL ILLINOIS...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However, small hail, gusty
winds, and heavy rain 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 3857 8876 3882 8880 3883 8870 3857 8870
TIME...MOT...LOC 0144Z 265DEG 48KT 3866 8889

$$

Elmore

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 7:09 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	51 min
Apr 27, 7:12 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Madison, Monroe, Saint Clair	63 min
Apr 27, 7:16 PM CDT	Flash Flood Warning	LSX	Montgomery	5 hr
Apr 27, 7:22 PM CDT	Tornado Warning	LSX	Fayette, Montgomery	38 min
Apr 27, 7:24 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	51 min
Apr 27, 7:50 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison, Marion	55 min
Apr 27, 7:52 PM CDT	Tornado Warning	LSX	Clinton, Saint Clair	38 min
Apr 27, 7:54 PM CDT	Areal Flood Advisory	LSX	Madison	4 hr
Apr 27, 7:56 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Monroe, Randolph, Saint Clair, Washington	64 min
Apr 27, 7:59 PM CDT	Flash Flood Warning	LSX	Fayette	6 hr
Apr 27, 8:15 PM CDT	Tornado Warning Tornado observed	LSX	Clinton, Fayette, Marion	45 min
Apr 27, 8:22 PM CDT	Areal Flood Advisory	LSX	Bond	6 hr
Apr 27, 8:30 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Clinton, Fayette, Marion, Washington	37 min
Apr 27, 8:55 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	30 min
Apr 27, 10:37 PM CDT	River Flood Warning	LSX	Adams	37 hr
Apr 27, 10:37 PM CDT	River Flood Warning	LSX	Adams	56 hr
Apr 27, 11:43 PM CDT	Areal Flood Warning	LSX	Macoupin	4 hr
Apr 28, 12:16 AM CDT	Areal Flood Warning	LSX	Montgomery	6 hr
Apr 28, 1:50 AM CDT	Areal Flood Warning	LSX	Fayette	6 hr
Apr 28, 7:40 AM CDT	Areal Flood Warning	LSX	Fayette	12 hr
Apr 28, 11:25 AM CDT	River Flood Warning	LSX	Brown	25 hr
Apr 28, 11:25 AM CDT	River Flood Warning	LSX	Morgan, Pike	4 days
Apr 28, 11:38 AM CDT	River Flood Warning	LSX	Madison	6 days
Apr 28, 11:38 AM CDT	River Flood Warning	LSX	Monroe	4 days
Apr 28, 11:38 AM CDT	River Flood Warning	LSX	Madison	5 days
Apr 28, 11:38 AM CDT	River Flood Warning	LSX	Saint Clair	5 days

Nearby

Tornado Warnings in Illinois, 2026 Every tornado warning in 2026 Tornadoes in 2026

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.