Alert archive / Illinois / Tornado Warnings in 2017

Tornado Warning 1, NWS St. Louis, MO

February 28, 2017Macoupin County, Montgomery County, Illinois

NWS St. Louis, MO issued this tornado warning at Feb 28, 2017, 5:14 PM CST for Macoupin County, Montgomery County, Illinois. It was in force for 31 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: Feb 28, 2017, 5:14 PM CST (23:14 UTC)
Expired: Feb 28, 2017, 5:45 PM CST
In force: 31 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Macoupin County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 90 km from the middle of the area, began a volume at 23:14 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
Feb 28, 2:19 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 126 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: 569 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

946 
WFUS53 KLSX 282314
TORLSX
ILC117-135-282345-
/O.NEW.KLSX.TO.W.0001.170228T2314Z-170228T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
514 PM CST TUE FEB 28 2017

The National Weather Service in St Louis has issued a

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

* Until 545 PM CST.

* At 513 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Girard, moving east at 55 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...
  Farmersville around 520 PM CST. 
  White Oak around 530 PM CST. 

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

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 3928 8984 3944 8992 3952 8969 3952 8953
      3936 8953 3935 8952
TIME...MOT...LOC 2313Z 249DEG 48KT 3939 8979 

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

$$

Britt

2 follow-up statements

339 
WWUS53 KLSX 282328
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
528 PM CST TUE FEB 28 2017

ILC117-282337-
/O.CAN.KLSX.TO.W.0001.000000T0000Z-170228T2345Z/
Macoupin IL-
528 PM CST TUE FEB 28 2017

...THE TORNADO WARNING FOR NORTHEASTERN MACOUPIN COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area.  Therefore, the warning has been cancelled.

A tornado watch remains in effect until 900 PM CST for south central
and southwestern Illinois.

LAT...LON 3931 8970 3951 8970 3952 8969 3952 8953
      3935 8953
TIME...MOT...LOC 2327Z 250DEG 42KT 3944 8961 

$$

ILC135-282345-
/O.CON.KLSX.TO.W.0001.000000T0000Z-170228T2345Z/
Montgomery IL-
528 PM CST TUE FEB 28 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CST FOR
NORTHWESTERN MONTGOMERY COUNTY...
    
At 527 PM CST, a severe thunderstorm capable of producing a tornado
was located over Farmersville, moving east at 50 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...
  White Oak around 530 PM CST. 

Other locations impacted by this tornadic thunderstorm include Harvel
and Waggoner.

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 8970 3951 8970 3952 8969 3952 8953
      3935 8953
TIME...MOT...LOC 2327Z 250DEG 42KT 3944 8961 

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

$$

Britt

973 
WWUS53 KLSX 282338
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
538 PM CST TUE FEB 28 2017

ILC135-282348-
/O.EXP.KLSX.TO.W.0001.000000T0000Z-170228T2345Z/
Montgomery IL-
538 PM CST TUE FEB 28 2017

...THE TORNADO WARNING FOR NORTHWESTERN MONTGOMERY COUNTY WILL EXPIRE
AT 545 PM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until 900 PM CST for south central
and southwestern Illinois.

LAT...LON 3931 8970 3951 8970 3952 8969 3952 8953
      3935 8953
TIME...MOT...LOC 2338Z 249DEG 48KT 3949 8944 

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 2:37 AM CST	Severe Thunderstorm Warning	LSX	Randolph	16 min
Feb 28, 12:50 PM CST	Wind Advisory	LSX	Adams, Brown, Pike	5 hr
Feb 28, 4:07 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph	26 min
Feb 28, 4:15 PM CST	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	32 min
Feb 28, 5:10 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	33 min
Feb 28, 5:29 PM CST	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	46 min
Feb 28, 5:36 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	39 min

Nearby

Tornado Warnings in Illinois, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.