Alert archive / Illinois / Tornado Warnings in 2026
Tornado Warning 4, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Mar 11, 2026, 5:05 AM CDT for Saint Clair County, Washington County, Illinois. It was in force for 25 min. 3 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
- Mar 11, 2026, 5:05 AM CDT (10:05 UTC)
- Expired
- Mar 11, 2026, 5:30 AM CDT
- In force
- 25 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.0 in
Counties Saint Clair County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 110 km from the middle of the area, began a volume at 10:05 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 |
|---|---|---|---|
| Mar 11, 5:05 AM CDT | TORNADO | 3 Sse Fayetteville, IL | Storm survey confirmed a brief EF-1 tornado with maximum estimated winds of 94 mph, based on analysis of damage to trees and outbuildings. Total path length of 2.6 miles. |
| Mar 11, 5:08 AM CDT | TSTM WND DMG | 2 Ssw Saint Libory, IL | Home damaged. |
| Mar 11, 5:15 AM CDT | TSTM WND DMG | 1 Ese Venedy, IL | Tree down on County Highway 6 east of Venedy. Time estimated by radar. |
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 00:00Z, 10.1 hours before the alert went out and 214 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.
- Mixed-layer CAPE
- 2012 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 1162 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 356 m²/s²
- Significant tornado parameter
- 2.8
- Supercell composite
- 15.0
The text
As transmitted.
358
WFUS53 KLSX 111005
TORLSX
ILC163-189-111030-
/O.NEW.KLSX.TO.W.0004.260311T1005Z-260311T1030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
505 AM CDT Wed Mar 11 2026
The National Weather Service in St Louis has issued a
* Tornado Warning for...
Washington County in south central Illinois...
Southeastern Saint Clair County in southwestern Illinois...
* Until 530 AM CDT.
* At 505 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Marissa, or 10 miles north of Sparta, moving east
at 80 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...
New Athens, Lenzburg, Marissa, Fayetteville, St. Libory, Lively
Grove, Johannisburg, Venedy, Oakdale, Okawville, Addieville,
Covington, Nashville, New Minden, Beaucoup, Hoyleton, Richview,
Irvington, Ashley and Wamac.
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.
&&
LAT...LON 3822 8985 3835 8989 3851 8928 3851 8925
3850 8914 3831 8915 3822 8956
TIME...MOT...LOC 1005Z 252DEG 67KT 3828 8978
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
MRB3 follow-up statements
547
WWUS53 KLSX 111015
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
515 AM CDT Wed Mar 11 2026
ILC163-111025-
/O.CAN.KLSX.TO.W.0004.000000T0000Z-260311T1030Z/
Saint Clair IL-
515 AM CDT Wed Mar 11 2026
...TORNADO WARNING IS CANCELLED FOR SOUTHEASTERN SAINT CLAIR
COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with this thunderstorm.
&&
LAT...LON 3851 8920 3850 8914 3845 8914 3840 8915
3831 8915 3824 8960 3829 8969 3840 8970
3851 8929
TIME...MOT...LOC 1005Z 252DEG 67KT 3828 8976
$$
ILC189-111030-
/O.CON.KLSX.TO.W.0004.000000T0000Z-260311T1030Z/
Washington IL-
515 AM CDT Wed Mar 11 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 530 AM CDT FOR WASHINGTON
COUNTY IN SOUTH CENTRAL ILLINOIS...
At 515 AM CDT, a severe thunderstorm capable of producing a tornado
was located near Lively Grove, or 9 miles west of Nashville, moving
east at 80 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...
Lively Grove, Stone Church, Johannisburg, Venedy, Elkton, Oakdale,
Okawville, Cordes, Addieville, Frogtown, Covington, Nashville, New
Minden, Huegely, Beaucoup, Hoyleton, Richview, Irvington, Ashley
and Wamac.
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!
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in St Louis MO.
&&
LAT...LON 3851 8920 3850 8914 3845 8914 3840 8915
3831 8915 3824 8960 3829 8969 3840 8970
3851 8929
TIME...MOT...LOC 1005Z 252DEG 67KT 3828 8976
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
MRB968
WWUS53 KLSX 111020
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
520 AM CDT Wed Mar 11 2026
ILC189-111030-
/O.CON.KLSX.TO.W.0004.000000T0000Z-260311T1030Z/
Washington IL-
520 AM CDT Wed Mar 11 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 530 AM CDT FOR CENTRAL
WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...
At 520 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Nashville, moving east at 80 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Elkton, Oakdale, Okawville, Cordes, Addieville, Frogtown,
Covington, Nashville, New Minden, Huegely, Beaucoup, Hoyleton,
Ashley, Irvington, Richview and Wamac.
This includes Interstate 64 in Illinois between exits 41 and 61.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
Tornadoes are difficult to observe at night. Take cover now!
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in St Louis MO.
&&
LAT...LON 3850 8916 3850 8914 3842 8915 3831 8915
3824 8958 3834 8955 3844 8956 3851 8930
3851 8925
TIME...MOT...LOC 1015Z 253DEG 69KT 3834 8952
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
MRB678
WWUS53 KLSX 111027
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
527 AM CDT Wed Mar 11 2026
ILC189-111037-
/O.EXP.KLSX.TO.W.0004.000000T0000Z-260311T1030Z/
Washington IL-
527 AM CDT Wed Mar 11 2026
...TORNADO WARNING WILL EXPIRE AT 530 AM CDT FOR CENTRAL WASHINGTON
COUNTY IN SOUTH CENTRAL ILLINOIS...
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 Severe Thunderstorm Warning still remains in effect for portions of
Washington County until 615 AM.
&&
LAT...LON 3850 8916 3850 8914 3842 8915 3831 8915
3824 8958 3834 8955 3844 8956 3851 8930
3851 8925
TIME...MOT...LOC 1020Z 253DEG 69KT 3837 8940
$$
MRBThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 9:44 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 31 min |
| Mar 10, 10:40 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 32 min |
| Mar 11, 3:02 AM CDT | Severe Thunderstorm Warning | LSX | Greene | 21 min |
| Mar 11, 3:17 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey, Macoupin, Madison | 43 min |
| Mar 11, 3:57 AM CDT | Severe Thunderstorm Warning | LSX | Bond, Macoupin, Madison, Montgomery | 48 min |
| Mar 11, 4:35 AM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair | 40 min |
| Mar 11, 5:26 AM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Fayette, Marion, Washington | 49 min |
Nearby
Tornado Warnings in Illinois, 2026Every tornado warning in 2026Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.