Alert archive / Illinois / Tornado Warnings in 2023

Tornado Warning 21, NWS St. Louis, MO

May 13, 2023Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at May 13, 2023, 3:59 PM CDT for Madison County, Illinois. It was in force for 31 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: May 13, 2023, 3:59 PM CDT (20:59 UTC)
Expired: May 13, 2023, 4:30 PM CDT
In force: 31 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Madison County, IL

The radar

The St Louis radar (KLSX), 81 km from the middle of the area, began a volume at 21:02 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
May 13, 4:00 PM CDT	TORNADO	1 N Worden, IL	SPOTTER OBSERVED A SMALL ROPE TORNADO NORTH OF WORDEN IL THAT WAS IN THE PROCESS OF OCCLUDING.

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
May 13, 12:24 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.0 hours before the alert went out and 169 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: 531 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 754 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

985 
WFUS53 KLSX 132059
TORLSX
ILC119-132145-
/O.NEW.KLSX.TO.W.0021.230513T2059Z-230513T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
359 PM CDT Sat May 13 2023

The National Weather Service in St Louis has issued a

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

* Until 445 PM CDT.
    
* At 359 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Worden, moving southeast at 15 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 dangerous storm will be near...
  Worden and Livingston around 405 PM CDT.
  Alhambra around 415 PM CDT.

This includes Interstate 55 in Illinois between exits 33 and 37.
 
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 3897 8990 3900 8987 3896 8965 3884 8973
TIME...MOT...LOC 2059Z 300DEG 13KT 3897 8985 

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

$$

MRM

2 follow-up statements

798 
WWUS53 KLSX 132112 RRA
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
412 PM CDT Sat May 13 2023

ILC119-132145-
/O.CON.KLSX.TO.W.0021.000000T0000Z-230513T2145Z/
Madison IL-
412 PM CDT Sat May 13 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR
NORTHEASTERN MADISON COUNTY IN SOUTHWESTERN ILLINOIS...
    
At 411 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Livingston, moving southeast at 20 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...
  Livingston and Alhambra around 415 PM CDT.

This includes Interstate 55 in Illinois near exit 33.
 
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 3894 8983 3897 8981 3896 8965 3885 8972
TIME...MOT...LOC 2111Z 303DEG 17KT 3895 8980 

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

$$

MRM

332 
WWUS53 KLSX 132130
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
430 PM CDT Sat May 13 2023

ILC119-132140-
/O.CAN.KLSX.TO.W.0021.000000T0000Z-230513T2145Z/
Madison IL-
430 PM CDT Sat May 13 2023

...THE TORNADO WARNING FOR NORTHEASTERN MADISON COUNTY IN
SOUTHWESTERN ILLINOIS IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
southwestern Illinois.

LAT...LON 3894 8983 3897 8981 3896 8965 3885 8972
TIME...MOT...LOC 2130Z 300DEG 13KT 3891 8972 

$$

MRM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 2:15 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	45 min
May 13, 2:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Madison	49 min
May 13, 2:49 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	41 min
May 13, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	24 min
May 13, 3:01 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	44 min
May 13, 3:26 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	49 min
May 13, 3:30 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	19 min
May 13, 3:41 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	49 min
May 13, 3:46 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton	44 min

Nearby

Tornado Warnings in Illinois, 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.