Alert archive / Illinois / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 21, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 11, 2026, 5:26 AM CDT for 5 counties in Illinois. It was in force for 49 min. 1 report 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, 5:26 AM CDT (10:26 UTC)
- Expired
- Mar 11, 2026, 6:15 AM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bond County, IL, Clinton County, IL, Fayette County, IL, Marion County, IL, Washington County, IL
The radar
The Evansville,IN radar (KVWX), 128 km from the middle of the area, began a volume at 10:27 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, 5:35 AM CDT | TSTM WND GST 66 | 1 Nw Salem, IL | Measured 66 mph wind gust at Salem Leckrone Airport KSLO. |
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, 10.4 hours before the alert went out and 170 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.
544
WUUS53 KLSX 111026
SVRLSX
ILC005-027-051-121-189-111115-
/O.NEW.KLSX.SV.W.0021.260311T1026Z-260311T1115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
526 AM CDT Wed Mar 11 2026
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southern Bond County in south central Illinois...
Northeastern Clinton County in south central Illinois...
Fayette County in south central Illinois...
Marion County in south central Illinois...
Eastern Washington County in south central Illinois...
* Until 615 AM CDT.
* At 526 AM CDT, severe thunderstorms were located along a line from
over Beaver Creek to over Nashville, or along a line from 6 miles
south of Greenville to over Nashville, moving northeast at 55 mph.
HAZARD...60 mph wind gusts and small hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Carlyle, Pocahontas, Nashville, Tamalco, Greenville, Sandoval,
Wamac, Central City, Centralia, Irvington, Odin, Patoka, Mulberry
Grove, Salem, Vandalia, Kinmundy, Farina, Brownstown and St. Elmo.
This includes the following State Parks...
Carlyle Lake Recreational Area.
This includes the following highways...
Interstate 64 in Illinois between exits 50 and 61. Interstate 70 in
Illinois between exits 36 and 76. Interstate 57 in Illinois between
exits 109 and 135.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. These storms are capable of producing damaging winds.
Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in St Louis MO.
&&
LAT...LON 3874 8954 3881 8960 3922 8887 3922 8881
3891 8881 3891 8869 3872 8870 3848 8870
3848 8897 3847 8900 3847 8914 3841 8915
3835 8915 3826 8949 3858 8940
TIME...MOT...LOC 1026Z 243DEG 49KT 3880 8943 3857 8924 3833 8937
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MRB4 follow-up statements
513
WWUS53 KLSX 111039
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
539 AM CDT Wed Mar 11 2026
ILC005-027-051-121-189-111115-
/O.CON.KLSX.SV.W.0021.000000T0000Z-260311T1115Z/
Bond IL-Clinton IL-Fayette IL-Marion IL-Washington IL-
539 AM CDT Wed Mar 11 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR
SOUTHERN BOND, NORTHEASTERN CLINTON, FAYETTE, MARION AND EASTERN
WASHINGTON COUNTIES IN SOUTH CENTRAL ILLINOIS...
At 539 AM CDT, severe thunderstorms were located along a line from
near Mulberry Grove to near Irvington, or along a line from 8 miles
east of Greenville to 9 miles south of Centralia, moving northeast at
55 mph.
HAZARD...60 mph wind gusts and small hail.
SOURCE...At 535 AM, the Salem AWOS measured a gust of 66 mph.
Emergency management reported also reported strong winds of
at least 50 mph at the Salem, IL hospital.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Carlyle, Pocahontas, Nashville, Tamalco, Greenville, Sandoval,
Wamac, Central City, Centralia, Irvington, Odin, Patoka, Mulberry
Grove, Salem, Vandalia, Kinmundy, Farina, Brownstown and St. Elmo.
This includes the following State Parks...
Carlyle Lake Recreational Area.
This includes the following highways...
Interstate 64 in Illinois between exits 50 and 61. Interstate 70 in
Illinois between exits 36 and 76. Interstate 57 in Illinois between
exits 109 and 135.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. These storms have produced damaging winds.
Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in St Louis MO.
&&
LAT...LON 3874 8954 3881 8960 3922 8887 3922 8881
3891 8881 3891 8869 3872 8870 3848 8870
3848 8897 3847 8900 3847 8914 3841 8915
3835 8915 3826 8949 3858 8940
TIME...MOT...LOC 1026Z 243DEG 49KT 3880 8942 3858 8923 3833 8936
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
MRB064
WWUS53 KLSX 111047
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
547 AM CDT Wed Mar 11 2026
ILC005-189-111057-
/O.CAN.KLSX.SV.W.0021.000000T0000Z-260311T1115Z/
Bond IL-Washington IL-
547 AM CDT Wed Mar 11 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHERN BOND AND
EASTERN WASHINGTON COUNTIES IN SOUTH CENTRAL ILLINOIS...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with these thunderstorms.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office.
&&
LAT...LON 3874 8925 3886 8926 3894 8926 3920 8891
3922 8888 3922 8881 3891 8881 3891 8869
3886 8869 3880 8870 3848 8870 3848 8898
3847 8907 3847 8914 3850 8914 3850 8916
3854 8919 3862 8921
TIME...MOT...LOC 1039Z 244DEG 49KT 3888 8921 3866 8902 3841 8915
$$
ILC027-051-121-111115-
/O.CON.KLSX.SV.W.0021.000000T0000Z-260311T1115Z/
Clinton IL-Fayette IL-Marion IL-
547 AM CDT Wed Mar 11 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR
NORTHEASTERN CLINTON, FAYETTE AND MARION COUNTIES IN SOUTH CENTRAL
ILLINOIS...
At 547 AM CDT, severe thunderstorms were located along a line from
near Vandalia to 8 miles south of Salem, moving northeast at 60 mph.
HAZARD...60 mph wind gusts and small hail.
SOURCE...At 535 AM, the Salem AWOS measured a gust of 66 mph.
Emergency management reported also reported strong winds of
at least 50 mph at the Salem, IL hospital.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Shattuc, Boulder, Sandoval, Fairman, Wamac, Central City,
Centralia, Mulberry Grove, Patoka, Odin, Shobonier, Salem,
Vandalia, Kinmundy, Brownstown, Farina, St. Elmo, Omega, Stephen
Forbes Station and Wrights Corner.
This includes the following highways...
Interstate 70 in Illinois between exits 61 and 76. Interstate 57 in
Illinois between exits 109 and 135.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. These storms have produced damaging winds.
Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in St Louis MO.
&&
LAT...LON 3874 8925 3886 8926 3894 8926 3920 8891
3922 8888 3922 8881 3891 8881 3891 8869
3886 8869 3880 8870 3848 8870 3848 8898
3847 8907 3847 8914 3850 8914 3850 8916
3854 8919 3862 8921
TIME...MOT...LOC 1039Z 237DEG 53KT 3897 8916 3874 8897 3846 8907
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
MRB684
WWUS53 KLSX 111058
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
558 AM CDT Wed Mar 11 2026
ILC027-111108-
/O.CAN.KLSX.SV.W.0021.000000T0000Z-260311T1115Z/
Clinton IL-
558 AM CDT Wed Mar 11 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR NORTHEASTERN CLINTON
COUNTY...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with these thunderstorms.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office.
&&
LAT...LON 3874 8914 3902 8913 3920 8891 3922 8889
3922 8881 3891 8881 3891 8869 3887 8869
3883 8870 3848 8870 3848 8898 3847 8903
3847 8914
TIME...MOT...LOC 1047Z 237DEG 53KT 3902 8904 3880 8885 3852 8895
$$
ILC051-121-111115-
/O.CON.KLSX.SV.W.0021.000000T0000Z-260311T1115Z/
Fayette IL-Marion IL-
558 AM CDT Wed Mar 11 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR
CENTRAL FAYETTE AND MARION COUNTIES IN SOUTH CENTRAL ILLINOIS...
At 558 AM CDT, severe thunderstorms were located along a line from
over Wrights Corner to 7 miles south of Omega, or along a line from
15 miles northeast of Vandalia to 9 miles east of Salem, moving
northeast at 60 mph.
HAZARD...60 mph wind gusts and small hail.
SOURCE...At 545 AM, emergency management reported a tree down in
Salem, IL.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Sandoval, Fairman, Wamac, Central City, Centralia, Patoka, Odin,
Shobonier, Salem, Vandalia, Tonti, Kinmundy, Brownstown, Farina,
Avena, St. Elmo, Omega, Stephen Forbes Station, Helm and Wrights
Corner.
This includes the following highways...
Interstate 70 in Illinois between exits 63 and 76. Interstate 57 in
Illinois between exits 109 and 135.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. These storms have produced damaging winds.
Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in St Louis MO.
&&
LAT...LON 3874 8914 3902 8913 3920 8891 3922 8889
3922 8881 3891 8881 3891 8869 3887 8869
3883 8870 3848 8870 3848 8898 3847 8903
3847 8914
TIME...MOT...LOC 1047Z 237DEG 53KT 3902 8904 3880 8885 3852 8895
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
MRB840
WWUS53 KLSX 111108
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
608 AM CDT Wed Mar 11 2026
ILC051-121-111118-
/O.EXP.KLSX.SV.W.0021.000000T0000Z-260311T1115Z/
Fayette IL-Marion IL-
608 AM CDT Wed Mar 11 2026
...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 615 AM CDT FOR CENTRAL
FAYETTE AND MARION COUNTIES IN SOUTH CENTRAL ILLINOIS...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However, gusty
winds are still possible with these thunderstorms.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office.
&&
LAT...LON 3874 8914 3902 8913 3920 8891 3922 8889
3922 8881 3891 8881 3891 8869 3887 8869
3883 8870 3848 8870 3848 8898 3847 8903
3847 8914
TIME...MOT...LOC 1058Z 237DEG 53KT 3912 8886 3889 8867 3861 8877
$$
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, 5:05 AM CDT | Tornado Warning | LSX | Saint Clair, Washington | 25 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2026Every severe thunderstorm warning 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.