Alert archive / Illinois / Tornado Warnings in 2017

Tornado Warning 5, NWS St. Louis, MO

February 28, 2017Randolph County, Illinois

NWS St. Louis, MO issued this tornado warning at Feb 28, 2017, 8:08 PM CST for Randolph County, Illinois. It was in force for 14 min. 3 reports 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: Feb 28, 2017, 8:08 PM CST (02:08 UTC)
Expired: Feb 28, 2017, 8:22 PM CST
In force: 14 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

County Randolph County, IL

The radar

The Paducah radar (KPAH), 120 km from the middle of the area, began a volume at 02:11 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
Feb 28, 8:19 PM CST	TORNADO	1 S Rockwood, IL	THIS LSR REFLECTS ONE COUNTY SEGMENT OF A TORNADO WHICH PASSED THROUGH PARTS OF PERRY COUNTY... RANDOLPH COUNTY... AND JACKSON COUNTY. PERRY AND JACKSON COUNTIES ARE COVERED BY WFO PAH. RANDOLPH COUNTY IS COVERED BY WFO LSX. THIS LSR COVERS THE RANDOLPH COUNTY
Feb 28, 8:19 PM CST	TORNADO	1 S Rockwood, IL	THIS LSR REFLECTS ONE COUNTY SEGMENT OF A TORNADO WHICH PASSED THROUGH PARTS OF PERRY COUNTY... RANDOLPH COUNTY... AND JACKSON COUNTY. PERRY AND JACKSON COUNTIES ARE COVERED BY WFO PAH. RANDOLPH COUNTY IS COVERED BY WFO LSX. THIS LSR COVERS THE RANDOLPH COUNTY
Feb 28, 8:19 PM CST	TORNADO	1 S Rockwood, IL	POWER FLASHES SEEN

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
Feb 28, 2:19 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.1 hours before the alert went out and 273 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: 687 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 395 m²/s²
0-3 km storm-relative helicity: 431 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

As transmitted.

743 
WFUS53 KLSX 010208
TORLSX
ILC157-010245-
/O.NEW.KLSX.TO.W.0005.170301T0208Z-170301T0245Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Southeastern Randolph County in southwestern Illinois...

* Until 845 PM CST.

* At 808 PM CST, a confirmed tornado was located near Perryville,
  moving east at 45 mph.

  HAZARD...Damaging tornado and quarter size hail. 

  SOURCE...Weather spotters confirmed tornado. 

  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...
  Rockwood and Shiloh Hill. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3785 8966 3784 8966 3782 8968 3780 8968
      3782 8971 3785 8974 3785 8979 3786 8980
      3789 8980 3795 8960
TIME...MOT...LOC 0208Z 250DEG 38KT 3779 8980 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Kanofsky

1 follow-up statement

153 
WWUS53 KLSX 010222
SVSLSX

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

ILC157-010231-
/O.CAN.KLSX.TO.W.0005.000000T0000Z-170301T0245Z/
Randolph IL-
822 PM CST TUE FEB 28 2017

...THE TORNADO WARNING FOR SOUTHEASTERN RANDOLPH COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

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

LAT...LON 3785 8966 3784 8966 3782 8968 3780 8968
      3782 8971 3785 8974 3785 8979 3786 8980
      3789 8980 3795 8960
TIME...MOT...LOC 0221Z 250DEG 38KT 3784 8963 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 6:14 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	46 min
Feb 28, 6:22 PM CST	Severe Thunderstorm Warning	LSX	Fayette	23 min
Feb 28, 6:57 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	48 min
Feb 28, 7:34 PM CST	Severe Thunderstorm Warning	LSX	Randolph	17 min
Feb 28, 8:29 PM CST	Severe Thunderstorm Warning	LSX	Adams, Pike	33 min
Feb 28, 8:37 PM CST	Tornado Warning	LSX	Adams, Pike	27 min
Feb 28, 9:07 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	38 min
Feb 28, 9:23 PM CST	Tornado Warning	LSX	Brown, Pike	22 min
Mar 1, 2:15 AM CST	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	34 min
Mar 1, 2:17 AM CST	Special Weather Statement	LSX	Monroe	43 min
Mar 1, 2:39 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Washington	25 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.