Alert archive / Illinois / Tornado Warnings in 2024

Tornado Warning 36, NWS St. Louis, MO

April 18, 2024Macoupin County, Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 18, 2024, 5:56 PM CDT for Macoupin County, Madison County, Illinois. It was in force for 49 min. 4 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, 5:56 PM CDT (22:56 UTC)
Expired: Apr 18, 2024, 6:45 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Macoupin County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 22:57 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, 6:01 PM CDT	TORNADO	1 S Prairietown, IL	Corrects previous tstm wnd dmg report from 1 S Prairietown. Report from mPING: Trees uprooted or snapped; Roof blown off. NWS survey team found EF1 damage with max winds to 95 mph.
Apr 18, 6:02 PM CDT	TSTM WND DMG	1 S Prairietown, IL	Report from mPING: Trees uprooted or snapped; Roof blown off.
Apr 18, 6:04 PM CDT	HAIL 1.5	2 S Benld, IL	Report from mPING: Ping Pong Ball (1.50 in.).
Apr 18, 6:06 PM CDT	TSTM WND DMG	Worden, IL	power poles down.

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, 10.9 hours before the alert went out and 176 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.

114 
WFUS53 KLSX 182256
TORLSX
ILC117-119-182345-
/O.NEW.KLSX.TO.W.0036.240418T2256Z-240418T2345Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northern Madison County in southwestern Illinois...
  Southeastern Macoupin County in southwestern Illinois...

* Until 645 PM CDT.

* At 556 PM CDT, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located over
  Dorsey, moving east 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.

* These dangerous storms will be near...
  Worden, Prairietown, and Carpenter around 600 PM CDT.
  Staunton and Livingston around 605 PM CDT.

This includes Interstate 55 in Illinois between exits 33 and 44.
 
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 3892 8971 3883 9011 3884 9011 3885 9012
      3898 9019 3916 8970 3900 8970
TIME...MOT...LOC 2256Z 257DEG 41KT 3894 8998 

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

$$

CVKING

2 follow-up statements

146 
WWUS53 KLSX 182303
SVSLSX

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

ILC117-119-182345-
/O.CON.KLSX.TO.W.0036.000000T0000Z-240418T2345Z/
Madison IL-Macoupin IL-
603 PM CDT Thu Apr 18 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
NORTHEASTERN MADISON AND SOUTHEASTERN MACOUPIN COUNTIES IN
SOUTHWESTERN ILLINOIS...

At 603 PM CDT, a confirmed tornado was located over Prairietown,
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.

This tornado will be near...
  Staunton, Worden, and Livingston around 610 PM CDT.

This includes Interstate 55 in Illinois between exits 33 and 41.
 
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 3885 9001 3903 9000 3907 8970 3900 8970
      3892 8971
TIME...MOT...LOC 2303Z 263DEG 34KT 3895 8992 

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

$$

CVKING

306 
WWUS53 KLSX 182321
SVSLSX

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

ILC117-119-182345-
/O.CON.KLSX.TO.W.0036.000000T0000Z-240418T2345Z/
Madison IL-Macoupin IL-
621 PM CDT Thu Apr 18 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
NORTHEASTERN MADISON AND SOUTHEASTERN MACOUPIN COUNTIES IN
SOUTHWESTERN ILLINOIS...

At 621 PM CDT, a confirmed tornado was located near Sorento, moving
east at 45 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.

This tornadic thunderstorm will remain over mainly rural areas of
northeastern Madison and southeastern Macoupin Counties in
southwestern Illinois, including the following locations...
Williamson.

This includes Interstate 55 in Illinois between exits 33 and 41.
 
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 3889 8983 3906 8978 3907 8970 3900 8970
      3892 8971
TIME...MOT...LOC 2321Z 256DEG 40KT 3900 8967 

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, 5:45 PM CDT	Tornado Warning	LSX	Madison	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, 5:59 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.