Alert archive / Missouri / Tornado Warnings in 2011

Tornado Warning 29, NWS St. Louis, MO

April 19, 2011Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 19, 2011, 7:30 PM CDT for Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois. It was in force for 45 min. 29 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, 7:30 PM CDT (00:30 UTC)
Expired: Apr 19, 2011, 8:15 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 45 km from the middle of the area, began a volume at 00:32 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, 7:30 PM CDT	HAIL 1	Olivette, MO
Apr 19, 7:33 PM CDT	HAIL 0.5	Affton, MO
Apr 19, 7:33 PM CDT	HAIL 1	Warson Woods, MO
Apr 19, 7:35 PM CDT	HAIL 0.25	Edwardsville, IL
Apr 19, 7:35 PM CDT	HAIL 1	Brentwood, MO
Apr 19, 7:35 PM CDT	HAIL 1	University City, MO
Apr 19, 7:40 PM CDT	HAIL 2	Warson Woods, MO
Apr 19, 7:43 PM CDT	HAIL 1	Sunset Hills, MO
Apr 19, 7:50 PM CDT	HAIL 1	Sunset Hills, MO
Apr 19, 7:50 PM CDT	HAIL 1.75	Granite City, IL
Apr 19, 7:51 PM CDT	HAIL 0.5	St. Louis, MO
Apr 19, 7:52 PM CDT	HAIL 0.88	Collinsville, IL	PENNY TO NICKEL SIZE HAIL
Apr 19, 7:54 PM CDT	HAIL 1	Affton, MO	I-270 AND TESSON FERRY
Apr 19, 7:55 PM CDT	HAIL 0.5	St. Louis, MO
Apr 19, 7:55 PM CDT	HAIL 1	St. Louis, MO	AT 7TH AND WASHINGTON. TIME ESTIMATED
Apr 19, 7:58 PM CDT	HAIL 1	Collinsville, IL
Apr 19, 7:59 PM CDT	HAIL 1.75	Caseyville, IL
Apr 19, 8:00 PM CDT	HAIL 0.25	Troy, IL
Apr 19, 8:00 PM CDT	HAIL 1	3 Ne Glen Carbon, IL
Apr 19, 8:00 PM CDT	HAIL 1	Brentwood, MO
Apr 19, 8:00 PM CDT	HAIL 1.75	Collinsville, IL
Apr 19, 8:03 PM CDT	HAIL 1	Collinsville, IL
Apr 19, 8:03 PM CDT	HAIL 1.75	Collinsville, IL
Apr 19, 8:07 PM CDT	HAIL 1.5	Collinsville, IL
Apr 19, 8:08 PM CDT	HAIL 0.88	Glen Carbon, IL
Apr 19, 8:11 PM CDT	HAIL 1	Troy, IL
Apr 19, 8:12 PM CDT	HAIL 1	2 Sw Marine, IL	AT I-270 AND RT 4
Apr 19, 8:13 PM CDT	HAIL 1	1 E Edwardsville, IL
Apr 19, 8:15 PM CDT	HAIL 0.5	Fairview Heights, 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, 0.5 hours before the alert went out and 206 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.

351 
WFUS53 KLSX 200030
TORLSX
ILC119-163-MOC189-510-200115-
/O.NEW.KLSX.TO.W.0029.110420T0030Z-110420T0115Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 815 PM CDT

* AT 727 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR WEBSTER GROVES...AND MOVING NORTHEAST AT 65
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  UNIVERSITY CITY...WOODSON TERRACE...ST. JOHN...BEL-RIDGE...
  BERKELEY...KINLOCH...HILLSDALE...NORMANDY...COOL VALLEY...ST.
  LOUIS...NORTHWOODS...CAHOKIA...FERGUSON...JENNINGS...DELLWOOD...
  BLACK JACK...BELLEFONTAINE NEIGHBORS...VENICE...EAST ST. LOUIS AND
  RIVERVIEW.

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 3850 9041 3871 9051 3883 9020 3883 9015
      3881 9012 3880 9012 3883 9011 3886 9013
      3893 8994 3866 8971
TIME...MOT...LOC 0030Z 243DEG 56KT 3860 9031

$$

GLASS

4 follow-up statements

084 
WWUS53 KLSX 200041
SVSLSX

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

ILC119-163-MOC189-510-200115-
/O.CON.KLSX.TO.W.0029.000000T0000Z-110420T0115Z/
ST. CLAIR IL-MADISON IL-ST. LOUIS CITY MO-ST. LOUIS MO-
741 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN ST. LOUIS...ST.
LOUIS CITY...WESTERN MADISON AND NORTHWESTERN ST. CLAIR COUNTIES
UNTIL 815 PM CDT...

AT 740 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS 
STORM WAS LOCATED NEAR MADISON...MOVING NORTHEAST AT 65 MPH. LARGE 
HAIL WILL ALSO OCCUR WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  CASEYVILLE...FAIRVIEW HEIGHTS...PONTOON BEACH...COLLINSVILLE...WOOD
  RIVER...MARYVILLE...GLEN CARBON...EDWARDSVILLE...TROY...HARTFORD...
  ROXANA...ST. JACOB...MITCHELL...POAG...KUHN AND FRUIT.

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 3850 9041 3871 9051 3883 9020 3883 9015
      3881 9012 3880 9012 3883 9011 3886 9013
      3893 8994 3866 8971
TIME...MOT...LOC 0041Z 243DEG 56KT 3868 9011

$$

GLASS

411 
WWUS53 KLSX 200054
SVSLSX

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

ILC119-163-MOC189-510-200115-
/O.CON.KLSX.TO.W.0029.000000T0000Z-110420T0115Z/
ST. CLAIR IL-MADISON IL-ST. LOUIS CITY MO-ST. LOUIS MO-
754 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL ST. LOUIS...
SOUTHERN ST. LOUIS CITY...WESTERN MADISON AND NORTHWESTERN ST. CLAIR
COUNTIES UNTIL 815 PM CDT...

AT 753 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR TROY...MOVING NORTHEAST AT 65 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST. JACOB...KUHN AND FRUIT.

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 3866 8971 3851 9038 3880 9012 3883 9011
      3886 9013 3893 8994
TIME...MOT...LOC 0055Z 243DEG 56KT 3872 8987

$$

GLASS

417 
WWUS53 KLSX 200105 RRA
SVSLSX

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

MOC189-510-200114-
/O.CAN.KLSX.TO.W.0029.000000T0000Z-110420T0115Z/
ST. LOUIS CITY MO-ST. LOUIS MO-
805 PM CDT TUE APR 19 2011

...THE TORNADO WARNING FOR SOUTHEASTERN ST. LOUIS AND SOUTHERN ST.
LOUIS CITY COUNTIES IS CANCELLED...

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

LAT...LON 3860 9018 3873 9008 3877 9004 3883 8999
      3893 8994 3866 8971
TIME...MOT...LOC 0104Z 243DEG 56KT 3872 8981

$$

ILC119-163-200115-
/O.CON.KLSX.TO.W.0029.000000T0000Z-110420T0115Z/
ST. CLAIR IL-MADISON IL-
805 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN MADISON AND
NORTHWESTERN ST. CLAIR COUNTIES UNTIL 815 PM CDT...

AT 802 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR TROY...MOVING NORTHEAST AT 65 MPH.

HAIL UP TO TWO INCHES IN DIAMETER WILL ALSO OCCUR WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  ST. JACOB.

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 3860 9018 3873 9008 3877 9004 3883 8999
      3893 8994 3866 8971
TIME...MOT...LOC 0104Z 243DEG 56KT 3872 8981

$$

GLASS

765 
WWUS53 KLSX 200118
SVSLSX

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

ILC119-163-200128-
/O.EXP.KLSX.TO.W.0029.000000T0000Z-110420T0115Z/
ST. CLAIR IL-MADISON IL-
818 PM CDT TUE APR 19 2011

...THE TORNADO WARNING FOR WESTERN MADISON AND NORTHWESTERN ST. CLAIR
COUNTIES HAS EXPIRED...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM.

LAT...LON 3860 9018 3873 9008 3877 9004 3883 8999
      3893 8994 3866 8971
TIME...MOT...LOC 0105Z 243DEG 56KT 3873 8979

$$

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:03 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Washington	42 min
Apr 19, 7:05 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	5 hr
Apr 19, 7:17 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	28 min
Apr 19, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis	42 min
Apr 19, 7:25 PM CDT	Tornado Warning	LSX	Iron, Madison, Saint Francois	40 min
Apr 19, 7:29 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois	46 min
Apr 19, 7:34 PM CDT	Tornado Warning	LSX	Madison, Sainte Genevieve, Saint Francois	41 min
Apr 19, 7:37 PM CDT	Tornado Warning	LSX	Jefferson, Saint Louis	36 min
Apr 19, 7:39 PM CDT	Tornado Warning	LSX	Franklin, Jefferson, Washington	33 min
Apr 19, 7:48 PM CDT	Tornado Warning	LSX	Madison	27 min
Apr 19, 7:54 PM CDT	Tornado Warning	LSX	Sainte Genevieve	36 min
Apr 19, 9:37 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	21 min
Apr 19, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	40 min
Apr 19, 7:51 PM CDT	Tornado Warning	LSX	Saint Clair	39 min
Apr 19, 7:56 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Montgomery	34 min
Apr 19, 8:00 PM CDT	Tornado Warning	LSX	Bond, Clinton, Madison	45 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, 9:41 PM CDT	River Flood Warning	LSX	Fayette	13 days

Nearby

Tornado Warnings in Missouri, 2011 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.