Alert archive / Illinois / Tornado Warnings in 2023

Tornado Warning 15, NWS St. Louis, MO

April 15, 2023Monroe County, Saint Clair County, Illinois; Jefferson County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 15, 2023, 6:34 PM CDT for Monroe County, Saint Clair County, Illinois; Jefferson County, Missouri. It was in force for 41 min. 26 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: Apr 15, 2023, 6:34 PM CDT (23:34 UTC)
Expired: Apr 15, 2023, 7:15 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Monroe County, IL, Saint Clair County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 23:37 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
Apr 15, 6:34 PM CDT	HAIL 1	1 Sw Festus, MO	REPORT FROM MPING: QUARTER (1.00 IN.).
Apr 15, 6:34 PM CDT	TORNADO	1 Ese Chalfin Bridge, IL	A WEAK TORNADO TRAVELED 16.3 MILES ACROSS MONROE COUNTY, ILLINOIS BETWEEN 6:34 PM AND 6:56 PM. THE TORNADO BEGAN NEAR THE MISSISSIPPI RIVER SOUTHWEST OF MAEYSTOWN AND TRAVERSED RURAL AREAS CAUSING SPORADIC TREE AND STRUCTURAL DAMAGE TO HECKER, IL. THE MAXIMUM
Apr 15, 6:34 PM CDT	TORNADO	Pevely, MO	A WEAK EF1 TORNADO FORMED JUST NORTHWEST OF THE INTERSECTION OF I-55 AND HIGHWAY Z. IT TRAVELED SOUTHEAST TO COMMERCIAL BLVD. MINOR DAMAGE TO TREES AND STRUCTURES WERE NOTED. THE TORNADO HAD MAX WINDS OF 100 MPH AND A MAXIMUM WIDTH OF 150 YARDS. THE TORNADO WA
Apr 15, 6:35 PM CDT	TSTM WND DMG	1 Wsw Herculaneum, MO	TRACTOR TRAILER OVERTURNED ON SOUTHBOUND I-55 NEAR MCNUTT. TIME ESTIMATED FROM RADAR.
Apr 15, 6:35 PM CDT	TORNADO	1 Wsw Herculaneum, MO	VIA TWITTER: MAJOR TREE DAMAGE AND A FEW STRUCTURES DAMAGED ALONG MCNUTT RD. QUIKTRIP AT MCNUTT AND I-55 HAD SIGN BLOWN OFF.
Apr 15, 6:37 PM CDT	TORNADO	Herculaneum, MO	VIA SOCIAL MEDIA WITH PICTURE INCLUDED: KADES PLAYGROUND BUILDING COLLAPSED.
Apr 15, 6:37 PM CDT	TORNADO	Pevely, MO	VIA TWITTER WITH PICTURES INCLUDED: TREES DOWN NEAR PEVELY EXIT DOWN TO MCNUTT. POWER POLE SNAPPED. STRUCTURAL DAMAGE IN THIS AREA.
Apr 15, 6:39 PM CDT	TORNADO	3 Sw Valmeyer, IL	A WEAK EF0 TORNADO DEVELOPED IN THE FLOOD PLAIN OF THE MISSISSIPPI RIVER SOUTHWEST OF VALMEYER, IL AND MOVED NORTHEAST FOR FIVE MILES. MINOR TREE DAMAGE AND STRUCTURAL DAMAGE OCCURRED TO OUTBUILDINGS. THE MAXIMUM WIDTH WAS 150 YARDS AND MAX WIND SPEED WAS 85 M
Apr 15, 6:40 PM CDT	TSTM WND DMG	Herculaneum, MO	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Apr 15, 6:43 PM CDT	TSTM WND DMG	Madonnaville, IL	IMAGES FROM TWITTER SHOW MULTIPLE LARGE TREES AND TREE BRANCHES SNAPPED AT A RESIDENCE IN MADONNAVILLE OFF OF AHNE ROAD. PORTIONS OF A TIN ROOF OF AN OUTBUILDING ON THE PROPERTY APPEAR TO BE DAMAGED AS WELL.
Apr 15, 6:44 PM CDT	TSTM WND DMG	2 Wsw Foster Pond, IL	IMAGES IN A LOCAL NEWS STORY SHOWS A TREE DOWN ALONG HIGHWAY 156 NEAR VALMEYER. TIME ESTIMATED FROM RADAR.
Apr 15, 6:44 PM CDT	HAIL 1	2 W Herculaneum, MO	REPORT FROM MPING: QUARTER (1.00 IN.).
Apr 15, 6:46 PM CDT	TSTM WND DMG	Pevely, MO	REPORT OF OVERTURNED VEHICLES ON I-55.
Apr 15, 6:47 PM CDT	HAIL 0.75	1 Nw Barnhart, MO	REPORT FROM MPING: DIME (0.75 IN.).
Apr 15, 6:48 PM CDT	HAIL 1	1 W Valmeyer, IL	REPORT FROM MPING: QUARTER (1.00 IN.).
Apr 15, 6:51 PM CDT	HAIL 1	1 Sse Pevely, MO	REPORT FROM MPING: QUARTER (1.00 IN.).
Apr 15, 6:52 PM CDT	HAIL 1	Pevely, MO
Apr 15, 6:55 PM CDT	TORNADO	Hecker, IL	NUMEROUS TREES DOWN. SEVERAL OUTBUILDINGS DESTROYED.
Apr 15, 6:57 PM CDT	TSTM WND GST 50	1 Nne Waterloo, IL	DIME SIZED HAIL ALSO OBSERVED.
Apr 15, 7:00 PM CDT	TSTM WND DMG	1 Ene Foster Pond, IL	TREES DOWN ALONG ROUTE 156.
Apr 15, 7:03 PM CDT	TORNADO	1 Se Belleville, IL	A WEAK EF0 TORNADO TRAVELED NORTHEAST THROUGH SWANSEA, IL STARTING ON WEST E STREET JUST WEST OF NORTH 5TH STREET. TREE DAMAGE AND MINOR STRUCTURAL DAMAGE WAS NOTED ALONG THE 1.12 MILE PATH WITH A MAXIMUM WIND SPEED OF 85 MPH AND A MAXIMUM WIDTH OF 90 YARDS.
Apr 15, 7:03 PM CDT	TORNADO	1 Se Belleville, IL	A WEAK EF1 TORNADO FORMED JUST WEST OF IL ROUTE 159 ON WEST F STREET. IT TRAVELED TO THE NORTHEAST TO ADELINE DRIVE JUST WEST OF NORTH GREEN MOUNT ROAD. MINOR DAMAGE TO TREES AND STRUCTURES WERE NOTED. THE TORNADO HAD MAX WINDS OF 98 MPH AND A MAXIMUM WIDTH OF
Apr 15, 7:10 PM CDT	TSTM WND GST 55	Freeburg, IL
Apr 15, 7:12 PM CDT	TSTM WND GST 60	Belleville, IL
Apr 15, 7:15 PM CDT	TSTM WND DMG	2 E Swansea, IL	HOME WITH ROOF DAMAGE.
Apr 15, 7:20 PM CDT	TSTM WND DMG	2 Ssw Saint Libory, IL	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.

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
Apr 15, 4:03 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.6 hours before the alert went out and 248 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: 40 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1437 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

428 
WFUS53 KLSX 152334
TORLSX
ILC133-163-MOC099-160015-
/O.NEW.KLSX.TO.W.0015.230415T2334Z-230416T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
634 PM CDT Sat Apr 15 2023

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Monroe County in southwestern Illinois...
  St. Clair County in southwestern Illinois...
  Southeastern Jefferson County in east central Missouri...

* Until 715 PM CDT.
    
* At 634 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Crystal City, moving northeast at 60 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.

* This dangerous storm will be near...
  New Design around 645 PM CDT.
  Red Bud around 650 PM CDT.

Other locations in the path of this tornadic thunderstorm include New
Athens.

This also includes Gov. Dunklin's Grave Historic Site.
 
This includes the following highways...
 Interstate 64 in Illinois between exits 23 and 27.
 Interstate 55 in Missouri between exits 170 and 187.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid 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 9003 3814 9004 3809 9021 3813 9025
      3809 9029 3809 9033 3807 9038 3834 9048
      3839 9034 3845 9028 3860 8974 3856 8970
      3822 8970
TIME...MOT...LOC 2334Z 245DEG 51KT 3817 9031 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Maples

3 follow-up statements

195 
WWUS53 KLSX 152343 RRA
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
643 PM CDT Sat Apr 15 2023

MOC099-152353-
/O.CAN.KLSX.TO.W.0015.000000T0000Z-230416T0015Z/
Jefferson MO-
643 PM CDT Sat Apr 15 2023

...THE TORNADO WARNING FOR SOUTHEASTERN JEFFERSON COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for south central
and southwestern Illinois...and east central Missouri.

LAT...LON 3822 9003 3814 9004 3809 9021 3816 9028
      3818 9033 3822 9036 3830 9037 3838 9035
      3845 9028 3860 8974 3856 8970 3822 8970
TIME...MOT...LOC 2343Z 245DEG 51KT 3823 9016 

$$

ILC133-163-160015-
/O.CON.KLSX.TO.W.0015.000000T0000Z-230416T0015Z/
Monroe IL-St. Clair IL-
643 PM CDT Sat Apr 15 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR MONROE
AND ST. CLAIR COUNTIES...
    
At 643 PM CDT, a severe thunderstorm capable of producing a tornado
was located near New Design, moving northeast at 60 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.

This dangerous storm will be near...
  Red Bud around 650 PM CDT.

Other locations in the path of this tornadic thunderstorm include New
Athens.

This includes Interstate 64 in Illinois between exits 23 and 27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid 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 9003 3814 9004 3809 9021 3816 9028
      3818 9033 3822 9036 3830 9037 3838 9035
      3845 9028 3860 8974 3856 8970 3822 8970
TIME...MOT...LOC 2343Z 245DEG 51KT 3823 9016 

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

$$

Maples

009 
WWUS53 KLSX 152352
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
652 PM CDT Sat Apr 15 2023

ILC133-163-160015-
/O.CON.KLSX.TO.W.0015.000000T0000Z-230416T0015Z/
Monroe IL-St. Clair IL-
652 PM CDT Sat Apr 15 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR CENTRAL
MONROE AND ST. CLAIR COUNTIES...
        
At 652 PM CDT, a confirmed tornado was located near Red Bud, moving
northeast at 60 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Radar confirmed tornado.

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.

This tornado will be near...
  New Athens around 655 PM CDT.

This includes Interstate 64 in Illinois between exits 23 and 27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid 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 9003 3814 9004 3827 9014 3837 9023
      3847 9021 3860 8974 3856 8970 3822 8970
TIME...MOT...LOC 2352Z 245DEG 51KT 3829 9001 

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

Maples

858 
WWUS53 KLSX 160001
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
701 PM CDT Sat Apr 15 2023

ILC133-160011-
/O.CAN.KLSX.TO.W.0015.000000T0000Z-230416T0015Z/
Monroe IL-
701 PM CDT Sat Apr 15 2023

...THE TORNADO WARNING FOR CENTRAL MONROE COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for south central
and southwestern Illinois.

LAT...LON 3822 8990 3827 8992 3829 8992 3828 8991
      3828 8990 3831 8991 3831 9004 3850 9008
      3860 8974 3856 8970 3822 8970
TIME...MOT...LOC 0001Z 245DEG 51KT 3835 8985 

$$

ILC163-160015-
/O.CON.KLSX.TO.W.0015.000000T0000Z-230416T0015Z/
St. Clair IL-
701 PM CDT Sat Apr 15 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR EASTERN
ST. CLAIR COUNTY...
        
At 701 PM CDT, a confirmed tornado was located over New Athens,
moving northeast at 60 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Radar confirmed tornado.

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.

This tornadic thunderstorm will remain over mainly rural areas of
eastern St. Clair County, including the following locations...
Paderborn, St. Libory, Fayetteville, Lenzburg , and Summerfield.

This includes Interstate 64 in Illinois between exits 23 and 27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid 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 8990 3827 8992 3829 8992 3828 8991
      3828 8990 3831 8991 3831 9004 3850 9008
      3860 8974 3856 8970 3822 8970
TIME...MOT...LOC 0001Z 245DEG 51KT 3835 8985 

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

Maples

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 6:17 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	43 min
Apr 15, 6:19 PM CDT	Tornado Warning	LSX	Saint Clair	41 min
Apr 15, 6:27 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	52 min
Apr 15, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	39 min
Apr 15, 6:39 PM CDT	Tornado Warning	LSX	Madison, Monroe, Saint Clair	51 min
Apr 15, 3:48 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Warren	42 min
Apr 15, 3:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Cole, Osage	51 min
Apr 15, 4:28 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Franklin, Gasconade, Montgomery, Warren	47 min
Apr 15, 4:36 PM CDT	Tornado Warning	LSX	Crawford, Franklin, Gasconade	39 min
Apr 15, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	35 min
Apr 15, 4:55 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	50 min
Apr 15, 4:58 PM CDT	Areal Flood Advisory	LSX	Osage	3 hr
Apr 15, 5:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Crawford, Franklin, Gasconade, Washington	47 min
Apr 15, 5:28 PM CDT	Flash Flood Warning	LSX	Franklin	5 hr
Apr 15, 5:31 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Louis	44 min
Apr 15, 5:47 PM CDT	Areal Flood Advisory	LSX	Franklin, Gasconade	3 hr
Apr 15, 5:52 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, Washington	38 min
Apr 15, 6:07 PM CDT	Tornado Warning	LSX	Franklin, Jefferson	35 min
Apr 15, 6:11 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis	49 min
Apr 15, 6:13 PM CDT	Flash Flood Warning	LSX	Franklin	4 hr
Apr 15, 6:23 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois	53 min
Apr 15, 6:39 PM CDT	Flash Flood Warning	LSX	Jefferson, Saint Louis	4 hr

Nearby

Tornado Warnings in Illinois, 2023 Tornado Warnings in Missouri, 2023 Every tornado warning in 2023 Tornadoes in 2023

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.