Alert archive / Illinois / Tornado Warnings in 2011

Tornado Warning 36, NWS St. Louis, MO

April 19, 2011Bond County, Clinton County, Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 19, 2011, 8:00 PM CDT for Bond County, Clinton County, Madison County, Illinois. It was in force for 45 min. 8 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: Apr 19, 2011, 8:00 PM CDT (01:00 UTC)
Expired: Apr 19, 2011, 8:45 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

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 01:02 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
Apr 19, 8:12 PM CDT	HAIL 1	2 Sw Marine, IL	AT I-270 AND RT 4
Apr 19, 8:14 PM CDT	FUNNEL CLOUD	Greenville, IL	WEST OF GREENVILLE
Apr 19, 8:22 PM CDT	TSTM WND GST 50	Greenville, IL	IN POCAHONTAS AND GREENVILLE
Apr 19, 8:22 PM CDT	HAIL 1.75	Greenville, IL	IN POCAHONTAS AND GREENVILLE
Apr 19, 8:30 PM CDT	HAIL 1	Greenville, IL	AT THE GREENVILLE EXIT ON INTERSTATE 70
Apr 19, 8:32 PM CDT	HAIL 0.75	3 N Greenville, IL
Apr 19, 8:33 PM CDT	HAIL 0.5	Smithboro, IL
Apr 19, 8:39 PM CDT	TSTM WND GST 58	2 S 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 19, 1:00 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.0 hours before the alert went out and 170 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: 2409 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 547 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 24.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

840 
WFUS53 KLSX 200100
TORLSX
ILC005-027-119-200145-
/O.NEW.KLSX.TO.W.0036.110420T0100Z-110420T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
800 PM CDT TUE APR 19 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTH CENTRAL CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 845 PM CDT

* AT 757 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR TROY...AND MOVING NORTHEAST AT 55 MPH.

  IN ADDITION...QUARTER SIZED HAIL OR LARGER WAS REPORTED WITH THIS 
  STORM.

* LOCATIONS IMPACTED INCLUDE...
  HIGHLAND...GREENVILLE...ST. JACOB...MARINE...ALHAMBRA...ST. ROSE...
  JAMESTOWN...POCAHONTAS...RENO...BEAVER CREEK...TAMALCO...WOBURN...
  MULBERRY GROVE...HAMEL...KAUFMAN...GRANTFORK...PIERRON...SHILOH
  HILL...OLD RIPLEY AND DUDLEYVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3867 8961 3866 8978 3886 8995 3903 8932
      3902 8926 3875 8926
TIME...MOT...LOC 0100Z 245DEG 46KT 3876 8983

$$

TILLY

1 follow-up statement

915 
WWUS53 KLSX 200127
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
827 PM CDT TUE APR 19 2011

ILC027-119-200137-
/O.CAN.KLSX.TO.W.0036.000000T0000Z-110420T0145Z/
CLINTON IL-MADISON IL-
827 PM CDT TUE APR 19 2011

...THE TORNADO WARNING FOR SOUTHEASTERN MADISON AND NORTH CENTRAL
CLINTON COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3882 8926 3874 8958 3874 8960 3889 8961
      3903 8932 3902 8926
TIME...MOT...LOC 0127Z 243DEG 48KT 3892 8934

$$

ILC005-200145-
/O.CON.KLSX.TO.W.0036.000000T0000Z-110420T0145Z/
BOND IL-
827 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR BOND COUNTY UNTIL 845 PM
CDT...

AT 823 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR GREENVILLE...MOVING NORTHEAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  MULBERRY GROVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3882 8926 3874 8958 3874 8960 3889 8961
      3903 8932 3902 8926
TIME...MOT...LOC 0127Z 243DEG 48KT 3892 8934

$$

TILLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:30 PM CDT	Tornado Warning	LSX	Madison, Saint Clair	45 min
Apr 19, 7:34 PM CDT	Tornado Warning	LSX	Randolph	41 min
Apr 19, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	40 min
Apr 19, 7:37 PM CDT	Tornado Warning	LSX	Monroe	36 min
Apr 19, 7:51 PM CDT	Tornado Warning	LSX	Saint Clair	39 min
Apr 19, 7:54 PM CDT	Tornado Warning	LSX	Randolph	36 min
Apr 19, 7:56 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Montgomery	34 min
Apr 19, 8:02 PM CDT	Areal Flood Advisory	LSX	Bond, Macoupin, Montgomery	4 hr
Apr 19, 8:18 PM CDT	Tornado Warning	LSX	Randolph, Saint Clair, Washington	42 min
Apr 19, 8:25 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	22 min
Apr 19, 8:33 PM CDT	Tornado Warning	LSX	Fayette	42 min
Apr 19, 8:33 PM CDT	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion, Washington	57 min
Apr 19, 9:37 PM CDT	Severe Thunderstorm Warning	LSX	Madison	21 min
Apr 19, 9:41 PM CDT	River Flood Warning	LSX	Fayette	13 days

Nearby

Tornado Warnings in Illinois, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.