Alert archive / Illinois / Tornado Warnings in 2025
Tornado Warning 84, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at May 20, 2025, 12:12 AM CDT for Jefferson County, Sainte Genevieve County, Missouri; Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 33 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
- May 20, 2025, 12:12 AM CDT (05:12 UTC)
- Expired
- May 20, 2025, 12:45 AM CDT
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.0 in
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Jefferson County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 05:17 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 |
|---|---|---|---|
| May 20, 12:21 AM CDT | TORNADO | 2 S Prairie Du Rocher, IL | NWS Storm Survey revealed an EF-1 tornado in far eastern Randolph county. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 19, 8:26 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 5.2 hours before the alert went out and 244 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1853 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 322 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
092
WFUS53 KLSX 200512
TORLSX
ILC133-157-163-MOC099-186-200615-
/O.NEW.KLSX.TO.W.0084.250520T0512Z-250520T0615Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
1212 AM CDT Tue May 20 2025
The National Weather Service in St Louis has issued a
* Tornado Warning for...
Monroe County in southwestern Illinois...
Northwestern Randolph County in southwestern Illinois...
Saint Clair County in southwestern Illinois...
Southeastern Jefferson County in east central Missouri...
Northeastern Sainte Genevieve County in southeastern Missouri...
* Until 115 AM CDT.
* At 1212 AM CDT, a severe thunderstorm capable of producing a
tornado was located 9 miles north of Bloomsdale, or 8 miles
southeast of Crystal City, 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...
Belleville, O'Fallon, East St. Louis, Collinsville, Fairview
Heights, Swansea, Shiloh, Waterloo, Columbia, Mascoutah, Lebanon,
Ste. Genevieve, Freeburg, Caseyville, Millstadt, Red Bud, New
Baden, Scott AFB, Smithton and New Athens.
This includes the following highways...
Interstate 64 in Illinois between exits 12 and 27.
Interstate 55 in Missouri between exits 150 and 170.
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 3808 9036 3813 9040 3866 8999 3866 8971
3840 8970 3821 8970 3788 9020
TIME...MOT...LOC 0512Z 214DEG 45KT 3813 9027
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Kimble3 follow-up statements
350
WWUS53 KLSX 200524
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1224 AM CDT Tue May 20 2025
MOC099-186-200534-
/O.CAN.KLSX.TO.W.0084.000000T0000Z-250520T0615Z/
Jefferson MO-Sainte Genevieve MO-
1224 AM CDT Tue May 20 2025
...TORNADO WARNING IS CANCELLED FOR SOUTHEASTERN JEFFERSON AND
NORTHEASTERN SAINTE GENEVIEVE COUNTIES...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with this thunderstorm.
&&
LAT...LON 3813 9024 3823 9032 3866 8999 3866 8971
3821 8970 3799 9003 3800 9005 3802 9006
3802 9009 3804 9013 3806 9013 3807 9016
3807 9018
TIME...MOT...LOC 0512Z 214DEG 45KT 3814 9027
$$
ILC133-157-163-200615-
/O.CON.KLSX.TO.W.0084.000000T0000Z-250520T0615Z/
Monroe IL-Randolph IL-Saint Clair IL-
1224 AM CDT Tue May 20 2025
...TORNADO WARNING REMAINS IN EFFECT UNTIL 115 AM CDT FOR MONROE,
NORTHWESTERN RANDOLPH AND SAINT CLAIR COUNTIES IN SOUTHWESTERN
ILLINOIS...
At 1224 AM CDT, severe thunderstorms capable of producing a tornado
were located along a line from near Waterloo to 7 miles north of
Ste. Genevieve, 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...
Belleville, O'Fallon, East St. Louis, Collinsville, Fairview
Heights, Swansea, Shiloh, Waterloo, Columbia, Mascoutah, Lebanon,
Ste. Genevieve, Freeburg, Caseyville, Millstadt, Red Bud, New
Baden, Scott AFB, Smithton and New Athens.
This includes Interstate 64 in Illinois between exits 12 and 27.
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 3813 9024 3823 9032 3866 8999 3866 8971
3821 8970 3799 9003 3800 9005 3802 9006
3802 9009 3804 9013 3806 9013 3807 9016
3807 9018
TIME...MOT...LOC 0512Z 216DEG 41KT 3818 9032 3796 9014
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Kimble494
WWUS53 KLSX 200536
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1236 AM CDT Tue May 20 2025
ILC133-157-163-200615-
/O.CON.KLSX.TO.W.0084.000000T0000Z-250520T0615Z/
Monroe IL-Randolph IL-Saint Clair IL-
1236 AM CDT Tue May 20 2025
...TORNADO WARNING REMAINS IN EFFECT UNTIL 115 AM CDT FOR CENTRAL
MONROE, NORTH CENTRAL RANDOLPH AND SAINT CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS...
At 1236 AM CDT, severe thunderstorms capable of producing a tornado
were located along a line from over Waterloo to near Baldwin, or
along a line from over Waterloo to 5 miles southeast of Red Bud,
moving northeast at 50 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows and vehicles will occur. Tree
damage is likely.
Locations impacted include...
Belleville, O'Fallon, East St. Louis, Collinsville, Fairview
Heights, Swansea, Shiloh, Waterloo, Columbia, Mascoutah, Lebanon,
Freeburg, Caseyville, Millstadt, Red Bud, New Baden, Scott AFB,
Smithton, New Athens and Marissa.
This includes Interstate 64 in Illinois between exits 12 and 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built
building away from windows. If you are outdoors, in a mobile home,
or in a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
Tornadoes are difficult to observe at night. Take cover now!
&&
LAT...LON 3844 9016 3866 8999 3866 8971 3841 8970
3822 8970 3808 8994 3834 9023
TIME...MOT...LOC 0524Z 216DEG 41KT 3826 9024 3807 9002
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Kimble760
WWUS53 KLSX 200545
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1245 AM CDT Tue May 20 2025
ILC133-157-163-200555-
/O.CAN.KLSX.TO.W.0084.000000T0000Z-250520T0615Z/
Monroe IL-Randolph IL-Saint Clair IL-
1245 AM CDT Tue May 20 2025
...TORNADO WARNING IS CANCELLED FOR CENTRAL MONROE, NORTH CENTRAL
RANDOLPH AND SAINT CLAIR COUNTIES IN SOUTHWESTERN ILLINOIS...
The storms which prompted the warning have weakened below severe
limits, and no longer appear capable of producing a tornado.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with these thunderstorms.
A Tornado Watch remains in effect until 300 AM CDT for a portion of
southwest Illinois.
&&
LAT...LON 3844 9016 3866 8999 3866 8971 3841 8970
3822 8970 3808 8994 3834 9023
TIME...MOT...LOC 0536Z 216DEG 41KT 3837 9013 3818 8991
$$
KimbleThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:53 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson | 32 min |
| May 19, 8:00 PM CDT | Tornado Warning | LSX | Jefferson | 24 min |
| May 19, 8:02 PM CDT | Severe Thunderstorm Warning | LSX | Cole, Moniteau | 58 min |
| May 19, 8:33 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 42 min |
| May 19, 8:35 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 40 min |
| May 19, 8:42 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Osage | 63 min |
| May 19, 8:43 PM CDT | Tornado Warning | LSX | Iron, Washington | 47 min |
| May 19, 8:55 PM CDT | Areal Flood Advisory | LSX | Audrain, Lewis, Marion, Monroe, Ralls, Shelby | 6 hr |
| May 19, 9:28 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Ralls | 47 min |
| May 19, 9:33 PM CDT | Tornado Warning | LSX | Washington | 42 min |
| May 19, 9:34 PM CDT | Tornado Warning | LSX | Marion | 38 min |
| May 19, 9:35 PM CDT | Tornado Warning | LSX | Crawford | 14 min |
| May 19, 10:01 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 44 min |
| May 19, 10:13 PM CDT | Tornado Warning | LSX | Franklin, Jefferson, Washington | 32 min |
| May 19, 10:17 PM CDT | Tornado Warning | LSX | Washington | 31 min |
| May 19, 10:26 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Iron, Reynolds, Washington | 49 min |
| May 19, 10:30 PM CDT | Tornado Warning | LSX | Crawford, Iron, Reynolds, Washington | 45 min |
| May 19, 10:43 PM CDT | Tornado Warning | LSX | Jefferson, Washington | 32 min |
| May 19, 10:47 PM CDT | Tornado Warning | LSX | Crawford, Franklin, Gasconade, Washington | 43 min |
| May 19, 10:53 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 68 min |
| May 19, 11:03 PM CDT | Tornado Warning | LSX | Pike | 25 min |
| May 19, 11:07 PM CDT | Areal Flood Advisory | LSX | Marion, Ralls | 4 hr |
| May 19, 11:07 PM CDT | Tornado Warning | LSX | Franklin, Iron, Saint Francois, Washington | 38 min |
| May 19, 11:10 PM CDT | Tornado Warning | LSX | Jefferson, Saint Louis | 30 min |
| May 19, 11:33 PM CDT | Tornado Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois | 42 min |
| May 19, 11:39 PM CDT | Severe Thunderstorm Warning | LSX | Madison | 47 min |
| May 19, 11:44 PM CDT | Tornado Warning | LSX | Madison | 36 min |
| May 20, 12:03 AM CDT | Areal Flood Advisory | LSX | Crawford, Franklin, Iron, Jefferson, Lincoln, Saint Charles and 6 more | 6 hr |
| May 20, 1:53 AM CDT | Areal Flood Warning | LSX | Saint Louis | 3 hr |
| May 20, 9:44 AM CDT | River Flood Warning | LSX | Crawford, Washington | 35 hr |
| May 20, 9:44 AM CDT | River Flood Warning | LSX | Crawford | 24 hr |
| May 19, 10:43 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin, Madison | 29 min |
| May 19, 10:56 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 57 min |
| May 20, 12:31 AM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Madison | 44 min |
Nearby
Tornado Warnings in Illinois, 2025Tornado Warnings in Missouri, 2025Every tornado warning in 2025Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.