Alert archive / Illinois / Tornado Warnings in 2020

Tornado Warning 7, NWS St. Louis, MO

July 15, 2020Macoupin County, Montgomery County, Illinois

NWS St. Louis, MO issued this tornado warning at Jul 15, 2020, 4:38 PM CDT for Macoupin County, Montgomery County, Illinois. It was in force for 23 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: Jul 15, 2020, 4:38 PM CDT (21:38 UTC)
Expired: Jul 15, 2020, 5:01 PM CDT
In force: 23 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Macoupin County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 95 km from the middle of the area, began a volume at 21:38 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
Jul 15, 4:47 PM CDT	TORNADO	4 Ese Palmyra, IL	TWO SPOTTERS REPORTED A TORNADO BRIEFLY TOUCHED DOWN IN A FIELD VERIFIED WITH A PICTURE. THIS TORNADO TOUCHED DOWN NORTHEAST OF HETTICK, IL, SOUTHWEST OF OTTER CREEK. THE TORNADO WAS VERY SHORT LIVED AND DID NOT DAMAGE ANY RATING INDICATORS, THUS IT WILL BE LA

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
Jul 15, 2:10 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 135 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: 1529 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

507 
WFUS53 KLSX 152138
TORLSX
ILC117-135-152230-
/O.NEW.KLSX.TO.W.0007.200715T2138Z-200715T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
438 PM CDT Wed Jul 15 2020

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northern Macoupin County in southwestern Illinois...
  Northwestern Montgomery County in south central Illinois...

* Until 530 PM CDT.
    
* At 438 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Palmyra, moving northeast at 20 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.

* This dangerous storm will be near...
  Girard around 515 PM CDT.
  Virden around 520 PM CDT.
  White Oak and Farmersville around 530 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Modesto, Nilwood, Waggoner, Standard City and Atwater.

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 3925 8993 3940 9006 3952 8996 3952 8953
      3938 8953
TIME...MOT...LOC 2138Z 237DEG 16KT 3936 8995 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CVKING

3 follow-up statements

687 
WWUS53 KLSX 152146
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
446 PM CDT Wed Jul 15 2020

ILC117-135-152230-
/O.CON.KLSX.TO.W.0007.000000T0000Z-200715T2230Z/
Macoupin IL-Montgomery IL-
446 PM CDT Wed Jul 15 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
NORTHEASTERN MACOUPIN AND NORTHWESTERN MONTGOMERY COUNTIES...
    
At 446 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Palmyra, moving northeast at 10 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.

This dangerous storm will be near...
  Palmyra around 455 PM CDT.
  Girard around 530 PM CDT.
  Virden around 545 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Nilwood and Modesto.

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 8992 3937 9003 3952 8996 3952 8956
TIME...MOT...LOC 2146Z 209DEG 10KT 3939 8994 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CVKING

701 
WWUS53 KLSX 152154
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
454 PM CDT Wed Jul 15 2020

ILC135-152203-
/O.CAN.KLSX.TO.W.0007.000000T0000Z-200715T2230Z/
Montgomery IL-
454 PM CDT Wed Jul 15 2020

...THE TORNADO WARNING FOR NORTHWESTERN MONTGOMERY COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning will not affect 
far northwest Montgomery County. Therefore, the warning has been 
cancelled.

A Tornado Watch remains in effect until 900 PM CDT for south central
and southwestern Illinois.

LAT...LON 3937 8991 3941 8998 3952 8993 3952 8970
TIME...MOT...LOC 2153Z 218DEG 15KT 3942 8991 

$$

ILC117-152230-
/O.CON.KLSX.TO.W.0007.000000T0000Z-200715T2230Z/
Macoupin IL-
454 PM CDT Wed Jul 15 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
NORTHEASTERN MACOUPIN COUNTY...
    
At 453 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Palmyra, moving northeast at 15 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation and several spotters have observed 
         funnel clouds and possible touchdowns with this storm.

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...
  Virden around 525 PM CDT.

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 3937 8991 3941 8998 3952 8993 3952 8970
TIME...MOT...LOC 2153Z 218DEG 15KT 3942 8991 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CVKING

332 
WWUS53 KLSX 152201
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
501 PM CDT Wed Jul 15 2020

ILC117-152211-
/O.CAN.KLSX.TO.W.0007.000000T0000Z-200715T2230Z/
Macoupin IL-
501 PM CDT Wed Jul 15 2020

...THE TORNADO WARNING FOR NORTHEASTERN MACOUPIN COUNTY 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 Tornado Watch remains in effect until 900 PM CDT for south central
and southwestern Illinois.

LAT...LON 3937 8991 3941 8998 3952 8993 3952 8970
TIME...MOT...LOC 2200Z 237DEG 16KT 3944 8987 

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 9:56 AM CDT	Severe Thunderstorm Warning	LSX	Adams	49 min
Jul 15, 2:26 PM CDT	Flash Flood Warning	LSX	Adams	5 hr
Jul 15, 4:20 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	40 min
Jul 15, 4:48 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Macoupin, Montgomery	42 min
Jul 15, 4:58 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Monroe, Saint Clair, Washington	47 min
Jul 15, 5:02 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Macoupin, Montgomery	43 min
Jul 15, 5:13 PM CDT	Tornado Warning	LSX	Clinton, Monroe, Saint Clair, Washington	25 min
Jul 15, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison	41 min
Jul 15, 5:30 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	45 min
Jul 15, 5:35 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	40 min
Jul 15, 5:43 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	47 min
Jul 15, 5:46 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette	44 min
Jul 15, 6:01 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	44 min
Jul 15, 6:10 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	50 min

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.