Alert archive / Illinois / Tornado Warnings in 2020

Tornado Warning 6, NWS St. Louis, MO

April 28, 2020Bond County, Clinton County, Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 28, 2020, 8:53 PM CDT for Bond County, Clinton County, Madison County, Illinois. It was in force for 37 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 28, 2020, 8:53 PM CDT (01:53 UTC)
Expired: Apr 28, 2020, 9:30 PM CDT
In force: 37 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Bond County, IL, Clinton County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 100 km from the middle of the area, began a volume at 01:53 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 28, 9:03 PM CDT	HAIL 0.7	2 Sse Highland, IL

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 28, 3:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.9 hours before the alert went out and 186 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: 549 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1190 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

047 
WFUS53 KLSX 290153
TORLSX
ILC005-027-119-290230-
/O.NEW.KLSX.TO.W.0006.200429T0153Z-200429T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
853 PM CDT Tue Apr 28 2020

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northwestern Clinton County in south central Illinois...
  Southeastern Bond County in south central Illinois...
  Southeastern Madison County in southwestern Illinois...

* Until 930 PM CDT.
    
* At 853 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Highland, moving east at 40 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...
  Breese and St. Rose around 900 PM CDT.
  Germantown and Jamestown around 905 PM CDT.
  Beckemeyer and Beaver Creek around 910 PM CDT.
  Carlyle around 915 PM CDT.
  Tamalco around 920 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Keyesport, Posey, Huey and Stolletown.

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 3852 8929 3858 8971 3865 8971 3866 8974
      3877 8973 3877 8926
TIME...MOT...LOC 0153Z 274DEG 36KT 3868 8964 

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

$$

Tilly

3 follow-up statements

327 
WWUS53 KLSX 290208
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
908 PM CDT Tue Apr 28 2020

ILC119-290218-
/O.CAN.KLSX.TO.W.0006.000000T0000Z-200429T0230Z/
Madison IL-
908 PM CDT Tue Apr 28 2020

...THE TORNADO WARNING FOR SOUTHEASTERN MADISON COUNTY IN
SOUTHWESTERN ILLINOIS 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 1100 PM CDT for
south central Illinois.

LAT...LON 3852 8929 3858 8966 3866 8959 3873 8959
      3877 8926
TIME...MOT...LOC 0208Z 275DEG 26KT 3866 8951 

$$

ILC005-027-290230-
/O.CON.KLSX.TO.W.0006.000000T0000Z-200429T0230Z/
Clinton IL-Bond IL-
908 PM CDT Tue Apr 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
NORTHWESTERN CLINTON AND SOUTHEASTERN BOND COUNTIES...
    
At 908 PM CDT, a severe thunderstorm capable of producing a tornado
was located over St. Rose, 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...
  Beckemeyer around 915 PM CDT.
  Carlyle around 920 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Keyesport, Posey, Huey and Stolletown.

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 3852 8929 3858 8966 3866 8959 3873 8959
      3877 8926
TIME...MOT...LOC 0208Z 275DEG 26KT 3866 8951 

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

$$

Tilly

709 
WWUS53 KLSX 290218
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
918 PM CDT Tue Apr 28 2020

ILC005-290228-
/O.CAN.KLSX.TO.W.0006.000000T0000Z-200429T0230Z/
Bond IL-
918 PM CDT Tue Apr 28 2020

...THE TORNADO WARNING FOR SOUTHEASTERN BOND 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 1100 PM CDT for
south central Illinois.

LAT...LON 3856 8956 3869 8953 3872 8927 3852 8929
TIME...MOT...LOC 0218Z 282DEG 35KT 3860 8936 

$$

ILC027-290230-
/O.CON.KLSX.TO.W.0006.000000T0000Z-200429T0230Z/
Clinton IL-
918 PM CDT Tue Apr 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR CENTRAL
CLINTON COUNTY...
    
At 918 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Carlyle, moving east at 40 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 tornadic thunderstorm will remain over mainly rural areas of
central Clinton County, including the following locations... Posey,
Huey and Stolletown.

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 3856 8956 3869 8953 3872 8927 3852 8929
TIME...MOT...LOC 0218Z 282DEG 35KT 3860 8936 

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

$$

Tilly

981 
WWUS53 KLSX 290227
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
927 PM CDT Tue Apr 28 2020

ILC027-290237-
/O.EXP.KLSX.TO.W.0006.000000T0000Z-200429T0230Z/
Clinton IL-
927 PM CDT Tue Apr 28 2020

...THE TORNADO WARNING FOR CENTRAL CLINTON COUNTY WILL EXPIRE AT 930
PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Illinois.

LAT...LON 3856 8956 3869 8953 3872 8927 3852 8929
TIME...MOT...LOC 0227Z 273DEG 31KT 3860 8929 

$$

Tilly

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 9:40 AM CDT	River Flood Warning	LSX	Fayette	3 days
Apr 29, 11:03 AM CDT	River Flood Warning	LSX	Brown	45 days
Apr 29, 11:03 AM CDT	River Flood Warning	LSX	Morgan, Pike	45 days

Nearby

Tornado Warnings in Illinois, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.