Alert archive / Illinois / Tornado Warnings in 2024

Tornado Warning 34, NWS St. Louis, MO

April 18, 2024Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 18, 2024, 5:45 PM CDT for Madison County, Illinois. It was in force for 45 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: Apr 18, 2024, 5:45 PM CDT (22:45 UTC)
Expired: Apr 18, 2024, 6:30 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Madison County, IL

The radar

The St Louis radar (KLSX), 55 km from the middle of the area, began a volume at 22:45 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 18, 5:52 PM CDT	TORNADO	1 S Pontoon Beach, IL	Tree damage with winds up to 80 mph. NWS storm survey continues.
Apr 18, 6:05 PM CDT	TSTM WND DMG	1 E Troy, IL	Large tree blown over.
Apr 18, 6:09 PM CDT	TORNADO	3 Se Kuhn, IL	Tree damage (limbs snapped) and minor roof damage (shingles off) along Lower Marine Road. NWS storm survey continues.

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 18, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.8 hours before the alert went out and 200 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1827 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

487 
WFUS53 KLSX 182245 RRA
TORLSX
ILC119-182330-
/O.NEW.KLSX.TO.W.0034.240418T2245Z-240418T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
545 PM CDT Thu Apr 18 2024

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Southwestern Madison County in southwestern Illinois...

* Until 630 PM CDT.

* At 545 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Granite City, moving east at 30 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...
  Granite City, Edwardsville, Pontoon Beach, and Madison around 550 
  PM CDT.
  Collinsville, Glen Carbon, Maryville, and South Roxana around 555 
  PM CDT.
  Troy around 605 PM CDT.

This also includes Horseshoe Lake State Park.
 
This includes the following highways...
 Interstate 70 in Illinois near exit 21.
 Interstate 55 in Illinois near exit 23.

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 3866 8976 3866 9018 3872 9021 3873 9021
      3875 9018 3877 9017 3880 9012 3882 9011
      3889 8983
TIME...MOT...LOC 2245Z 261DEG 25KT 3873 9017 

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

$$

CVKING

1 follow-up statement

185 
WWUS53 KLSX 182305
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
605 PM CDT Thu Apr 18 2024

ILC119-182330-
/O.CON.KLSX.TO.W.0034.000000T0000Z-240418T2330Z/
Madison IL-
605 PM CDT Thu Apr 18 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR SOUTH
CENTRAL MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

At 605 PM CDT, a confirmed tornado was located near Glen Carbon,
moving east at 40 mph.

HAZARD...Damaging tornado.

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.

Locations impacted include...
  Troy.

This includes the following highways...
 Interstate 70 in Illinois near exit 21.
 Interstate 55 in Illinois near exit 23.

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 3866 8976 3866 9007 3880 9001 3885 9001
      3889 8983
TIME...MOT...LOC 2305Z 262DEG 36KT 3878 8991 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 3:23 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Pike	52 min
Apr 18, 3:49 PM CDT	Tornado Warning	LSX	Pike	26 min
Apr 18, 4:03 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Greene	57 min
Apr 18, 4:16 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Calhoun	44 min
Apr 18, 4:25 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene	50 min
Apr 18, 4:40 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	50 min
Apr 18, 4:47 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	58 min
Apr 18, 4:48 PM CDT	Tornado Warning	LSX	Calhoun	42 min
Apr 18, 4:52 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	38 min
Apr 18, 5:01 PM CDT	Tornado Warning Tornado observed	LSX	Greene, Macoupin	29 min
Apr 18, 5:07 PM CDT	Tornado Warning	LSX	Greene, Jersey	23 min
Apr 18, 5:18 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Madison	27 min
Apr 18, 5:25 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	65 min
Apr 18, 5:26 PM CDT	Tornado Warning	LSX	Macoupin	34 min
Apr 18, 5:30 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	60 min
Apr 18, 5:34 PM CDT	Tornado Warning	LSX	Greene, Jersey, Macoupin	26 min
Apr 18, 5:37 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Monroe	53 min
Apr 18, 5:39 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	66 min
Apr 18, 5:45 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	45 min
Apr 18, 5:49 PM CDT	Tornado Warning	LSX	Monroe, Saint Clair	41 min
Apr 18, 5:53 PM CDT	Areal Flood Advisory	LSX	Greene, Macoupin	2 hr
Apr 18, 5:56 PM CDT	Tornado Warning	LSX	Macoupin, Madison	49 min
Apr 18, 5:59 PM CDT	Tornado Warning	LSX	Macoupin	31 min
Apr 18, 6:10 PM CDT	Tornado Warning	LSX	Bond, Clinton, Madison, Saint Clair, Washington	65 min
Apr 18, 6:13 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	77 min
Apr 18, 6:14 PM CDT	Tornado Warning	LSX	Montgomery	46 min
Apr 18, 6:34 PM CDT	Tornado Warning	LSX	Monroe, Randolph	41 min
Apr 18, 6:41 PM CDT	Tornado Warning	LSX	Fayette	49 min

Nearby

Tornado Warnings in Illinois, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.