Alert archive / Illinois / Tornado Warnings in 2024

Tornado Warning 30, NWS St. Louis, MO

April 18, 2024Macoupin County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 18, 2024, 5:26 PM CDT for Macoupin County, Illinois. It was in force for 34 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: Apr 18, 2024, 5:26 PM CDT (22:26 UTC)
Expired: Apr 18, 2024, 6:00 PM CDT
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Macoupin County, IL

The radar

The St Louis radar (KLSX), 98 km from the middle of the area, began a volume at 22:27 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	3 S Standard City, IL	A brief tornado touched down south of Standard City where it damaged the roofs of 3 farm sheds. The tornado moved southeast across South Standard City Rd where it caused tree damage before lifting. Path length 0.23 miles. Estimated peak wind speed 95 mph. Rati

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, 10.4 hours before the alert went out and 144 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.

315 
WFUS53 KLSX 182226
TORLSX
ILC117-182300-
/O.NEW.KLSX.TO.W.0030.240418T2226Z-240418T2300Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northeastern Macoupin County in southwestern Illinois...

* Until 600 PM CDT.

* At 526 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Palmyra, moving east at 25 mph.

  HAZARD...Tornado and half dollar 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 tornadic thunderstorm will remain over mainly rural areas of
  northeastern Macoupin County, including the following locations...
  Nilwood, Hettick, and Standard City.

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 3932 9005 3943 9005 3946 8979 3928 8978
TIME...MOT...LOC 2226Z 271DEG 21KT 3937 8998 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN

$$

Pfahler

1 follow-up statement

525 
WWUS53 KLSX 182237
SVSLSX

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

ILC117-182300-
/O.CON.KLSX.TO.W.0030.000000T0000Z-240418T2300Z/
Macoupin IL-
537 PM CDT Thu Apr 18 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
NORTHEASTERN MACOUPIN COUNTY...

At 537 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Carlinville, moving east at 25 mph.

HAZARD...Tornado and half dollar 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...
Nilwood and Standard City.

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 3931 8996 3940 8996 3942 8979 3928 8978
TIME...MOT...LOC 2237Z 271DEG 21KT 3937 8989 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN

$$

Pfahler

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, 5:30 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, 5:56 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.