Alert archive / Illinois / Tornado Warnings in 2023

Tornado Warning 16, NWS St. Louis, MO

April 15, 2023Madison County, Monroe County, Saint Clair County, Illinois; Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 15, 2023, 6:39 PM CDT for Madison County, Monroe County, Saint Clair County, Illinois; Saint Louis County, City of Saint Louis, Missouri. It was in force for 51 min. 22 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, 6:39 PM CDT (23:39 UTC)
Expired: Apr 15, 2023, 7:30 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 57 km from the middle of the area, began a volume at 23:43 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, 6:42 PM CDT	TSTM WND DMG	3 Ese Shrewsbury, MO	IMAGES ON TWITTER SHOW SEVERAL LARGE TREES AND TREE LIMBS SNAPPED. TIME ESTIMATED FROM RADAR.
Apr 15, 6:45 PM CDT	TSTM WND GST 67	1 Ssw Roxana, IL
Apr 15, 6:47 PM CDT	TSTM WND DMG	2 Se Hillsdale, MO	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Apr 15, 6:49 PM CDT	HAIL 0.5	2 Ene Mehlville, MO	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Apr 15, 6:52 PM CDT	HAIL 0.5	2 E Maplewood, MO
Apr 15, 6:55 PM CDT	TSTM WND GST 60	2 Ene Maplewood, MO	I-44 AND HAMPTON.
Apr 15, 6:56 PM CDT	HAIL 1	2 Ssw Saint Louis, MO	ALSO 30-40 MPH WINDS.
Apr 15, 6:58 PM CDT	TSTM WND GST 56	1 Sse Sauget, IL	KCPS ASOS.
Apr 15, 6:58 PM CDT	HAIL 0.5	2 Nne Lemay, MO	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Apr 15, 7:00 PM CDT	TSTM WND DMG	3 E Shrewsbury, MO	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF.
Apr 15, 7:00 PM CDT	HAIL 1	3 E Shrewsbury, MO	REPORT FROM MPING: QUARTER (1.00 IN.).
Apr 15, 7:02 PM CDT	TSTM WND DMG	2 E Centreville, IL	WIDESPREAD TREE DAMAGE ON SIGNAL HILL BLVD. SEVERAL LARGE TREES BLOWN DOWN, NUMEROUS LARGE TREE LIMBS DOWN. SOME DAMAGE TO HOMES DUE TO FALLEN TREES. SEVERAL POWER LINES KNOCKED DOWN. VIA EMAIL REPORT WITH PICTURES.
Apr 15, 7:02 PM CDT	TSTM WND DMG	Belleville, IL	PICTURE FROM SOCIAL MEDIA SHOWS LARGE TREE BLOWN DOWN AND MULTIPLE LARGE LIMBS DOWN IN BELLEVILLE.
Apr 15, 7:02 PM CDT	HAIL 0.75	3 S Saint Louis, MO	REPORT FROM MPING: DIME (0.75 IN.).
Apr 15, 7:02 PM CDT	TORNADO	3 W Collinsville, IL	BROADCAST METEOROLOGIST WITNESSED BRIEF TOUCHDOWN JUST WEST OF OF I-255/70 INTERCHANGE IN COLLINSVILLE.
Apr 15, 7:04 PM CDT	HAIL 0.5	3 E Saint Louis, MO	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Apr 15, 7:05 PM CDT	TSTM WND DMG	2 Se Fairview Heights, IL	IMAGE FROM FACEBOOK OF A SNAPPED TREE.
Apr 15, 7:10 PM CDT	TSTM WND GST 60	Belleville, IL
Apr 15, 7:11 PM CDT	HAIL 0.75	2 Ssw Mitchell, IL	REPORT FROM MPING: DIME (0.75 IN.).
Apr 15, 7:14 PM CDT	TSTM WND DMG	Fairview Heights, IL	VIA TWITTER WITH PICTURE INCLUDED: TREE FELL INTO HOUSE CAUSING DAMAGE TO INTERIOR OF HOME.
Apr 15, 7:15 PM CDT	TSTM WND DMG	2 E Swansea, IL	HOME WITH ROOF DAMAGE.
Apr 15, 7:16 PM CDT	TSTM WND DMG	2 W O'Fallon, 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, 11.7 hours before the alert went out and 209 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.

827 
WFUS53 KLSX 152339
TORLSX
ILC119-133-163-MOC189-510-160030-
/O.NEW.KLSX.TO.W.0016.230415T2339Z-230416T0030Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northwestern Monroe County in southwestern Illinois...
  Southwestern Madison County in southwestern Illinois...
  Northern St. Clair County in southwestern Illinois...
  St. Louis City in east central Missouri...
  Southeastern St. Louis County in east central Missouri...

* Until 730 PM CDT.
    
* At 639 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Maplewood, moving northeast at 40 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...
  St. Louis, Granite City, East St. Louis, Cahokia, Madison, Venice, 
  Fairmont City, Wellston, and Brooklyn around 645 PM CDT.
  Collinsville, Pontoon Beach, and Washington Park around 650 PM 
  CDT.
  Caseyville around 655 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Edwardsville, Glen Carbon, Maryville and Troy.

This also includes Scott Joplin Historic Site and Horseshoe Lake
State Park.
 
This includes the following highways...
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 9 and 19.

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 3860 8973 3847 9020 3846 9029 3873 9030
      3890 8994
TIME...MOT...LOC 2339Z 244DEG 36KT 3861 9029 

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

$$

MRB

2 follow-up statements

055 
WWUS53 KLSX 160004
SVSLSX

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

ILC133-MOC189-510-160013-
/O.CAN.KLSX.TO.W.0016.000000T0000Z-230416T0030Z/
Monroe IL-St. Louis City MO-St. Louis MO-
704 PM CDT Sat Apr 15 2023

...THE TORNADO WARNING FOR NORTHWESTERN MONROE AND SOUTHEASTERN ST.
LOUIS COUNTIES AND ST. LOUIS CITY 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 southwestern
Illinois...and east central Missouri.

LAT...LON 3860 8973 3850 9009 3863 9018 3866 9018
      3871 9021 3873 9021 3875 9018 3877 9017
      3880 9012 3882 9011 3890 8994
TIME...MOT...LOC 0003Z 243DEG 33KT 3871 9006 

$$

ILC119-163-160030-
/O.CON.KLSX.TO.W.0016.000000T0000Z-230416T0030Z/
Madison IL-St. Clair IL-
704 PM CDT Sat Apr 15 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHWESTERN MADISON AND NORTHEASTERN ST. CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS...
    
At 703 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Pontoon Beach, moving northeast at 40 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...
  Collinsville, Edwardsville, Glen Carbon, Troy, Maryville and 
  Pontoon Beach.

This also includes Horseshoe Lake State Park.
 
This includes the following highways...
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 9 and 19.

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 3860 8973 3850 9009 3863 9018 3866 9018
      3871 9021 3873 9021 3875 9018 3877 9017
      3880 9012 3882 9011 3890 8994
TIME...MOT...LOC 0003Z 243DEG 33KT 3871 9006 

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

$$

MRB

254 
WWUS53 KLSX 160021
SVSLSX

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

ILC119-163-160030-
/O.CON.KLSX.TO.W.0016.000000T0000Z-230416T0030Z/
Madison IL-St. Clair IL-
721 PM CDT Sat Apr 15 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR SOUTH
CENTRAL MADISON AND NORTHEASTERN ST. CLAIR COUNTIES IN SOUTHWESTERN
ILLINOIS...
    
At 721 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Marine, moving northeast at 40 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...
O'Fallon, Collinsville, Edwardsville, Fairview Heights, Glen Carbon,
Shiloh, Wood River, Troy, Maryville, Pontoon Beach, Lebanon,
Caseyville, South Roxana, Roxana, Hartford, Summerfield, Poag, and
Kuhn.

This includes the following highways...
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 14 and 19.

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 3854 8994 3884 9008 3890 8994 3860 8973
TIME...MOT...LOC 0021Z 244DEG 36KT 3879 8985 

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

$$

MRB

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, 6:34 PM CDT	Tornado Warning	LSX	Monroe, Saint Clair	41 min
Apr 15, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	39 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.