Alert archive / Illinois / Tornado Warnings in 2024

Tornado Warning 40, NWS St. Louis, MO

April 18, 2024Monroe County, Randolph County, Illinois; Sainte Genevieve County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 18, 2024, 6:34 PM CDT for Monroe County, Randolph County, Illinois; Sainte Genevieve County, Missouri. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 18, 2024, 6:34 PM CDT (23:34 UTC)
Expired: Apr 18, 2024, 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, Randolph County, IL, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 91 km from the middle of the area, began a volume at 23:33 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.

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, 11.6 hours before the alert went out and 253 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.

575 
WFUS53 KLSX 182334
TORLSX
ILC133-157-MOC186-190015-
/O.NEW.KLSX.TO.W.0040.240418T2334Z-240419T0015Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Southeastern Monroe County in southwestern Illinois...
  Randolph County in southwestern Illinois...
  Northeastern Ste. Genevieve County in southeastern Missouri...

* Until 715 PM CDT.

* At 634 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Bloomsdale, moving east 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...
  Evansville around 645 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Sparta.

This also includes Felix Valle House State Park.
 
This includes Interstate 55 in Missouri between exits 154 and 162.
 
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 3795 8960 3798 9032 3812 9025 3822 9025
      3823 9003 3823 8990 3822 8990 3822 8959
TIME...MOT...LOC 2334Z 269DEG 51KT 3808 9020 

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

$$

CVKING

2 follow-up statements

524 
WWUS53 KLSX 182355
SVSLSX

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

MOC186-190005-
/O.CAN.KLSX.TO.W.0040.000000T0000Z-240419T0015Z/
Ste. Genevieve MO-
655 PM CDT Thu Apr 18 2024

...THE TORNADO WARNING FOR NORTHEASTERN STE. GENEVIEVE COUNTY IS
CANCELLED...

The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
south central and southwestern Illinois...and southeastern Missouri.

&&

LAT...LON 3796 8960 3797 9001 3799 9003 3811 9002
      3823 9007 3823 8990 3822 8990 3822 8959
TIME...MOT...LOC 2355Z 269DEG 51KT 3808 8982 

$$

ILC133-157-190015-
/O.CON.KLSX.TO.W.0040.000000T0000Z-240419T0015Z/
Monroe IL-Randolph IL-
655 PM CDT Thu Apr 18 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
SOUTHEASTERN MONROE AND RANDOLPH COUNTIES...

At 655 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Evansville, moving east 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.

Locations impacted include...
  Sparta.

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 3796 8960 3797 9001 3799 9003 3811 9002
      3823 9007 3823 8990 3822 8990 3822 8959
TIME...MOT...LOC 2355Z 269DEG 51KT 3808 8982 

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

$$

Pfahler

342 
WWUS53 KLSX 190005
SVSLSX

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

ILC133-190015-
/O.CAN.KLSX.TO.W.0040.000000T0000Z-240419T0015Z/
Monroe IL-
705 PM CDT Thu Apr 18 2024

...THE TORNADO WARNING FOR SOUTHEASTERN 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 Severe Thunderstorm Watch remains in effect until 800 PM CDT for
south central and southwestern Illinois.

&&

LAT...LON 3803 8960 3803 8988 3813 8985 3822 8990
      3822 8959
TIME...MOT...LOC 0005Z 264DEG 44KT 3813 8973 

$$

ILC157-190015-
/O.CON.KLSX.TO.W.0040.000000T0000Z-240419T0015Z/
Randolph IL-
705 PM CDT Thu Apr 18 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHEASTERN RANDOLPH COUNTY...

At 705 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sparta, moving east at 50 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...
Sparta, Coulterville, Tilden, Baldwin, Eden, Blair, Houston, and
Walsh.

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 3803 8960 3803 8988 3813 8985 3822 8990
      3822 8959
TIME...MOT...LOC 0005Z 264DEG 44KT 3813 8973 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 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, 5:26 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, 5:56 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, 6:41 PM CDT	Tornado Warning	LSX	Fayette	49 min
Apr 18, 2:42 PM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	63 min
Apr 18, 2:42 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone	48 min
Apr 18, 3:00 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	30 min
Apr 18, 3:20 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Montgomery, Pike	40 min
Apr 18, 3:21 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	39 min
Apr 18, 3:53 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Pike	52 min
Apr 18, 3:57 PM CDT	Severe Thunderstorm Warning	LSX	Pike	48 min
Apr 18, 4:09 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	51 min
Apr 18, 4:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	47 min
Apr 18, 5:04 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	56 min
Apr 18, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis	48 min
Apr 18, 5:33 PM CDT	Tornado Warning	LSX	Jefferson, Saint Louis	25 min

Nearby

Tornado Warnings in Illinois, 2024 Tornado Warnings in Missouri, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.