Alert archive / Missouri / Tornado Warnings in 2011

Tornado Warning 33, NWS St. Louis, MO

April 19, 2011Madison County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 19, 2011, 7:48 PM CDT for Madison County, Missouri. It was in force for 27 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: Apr 19, 2011, 7:48 PM CDT (00:48 UTC)
Expired: Apr 19, 2011, 8:15 PM CDT
In force: 27 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

County Madison County, MO

The radar

The Paducah radar (KPAH), 133 km from the middle of the area, began a volume at 00:49 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
Apr 19, 1:00 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 0.8 hours before the alert went out and 285 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: 1605 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 2015 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.6

Open this sounding in Storm Lab

The text

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

927 
WFUS53 KLSX 200048
TORLSX
MOC123-200115-
/O.NEW.KLSX.TO.W.0033.110420T0048Z-110420T0115Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN MADISON COUNTY IN SOUTHEAST MISSOURI...

* UNTIL 815 PM CDT

* AT 744 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS 
  DANGEROUS STORM WAS LOCATED BETWEEN BUCKHORN AND MARQUAND...
  AND MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MARQUAND.

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 3749 9015 3732 9014 3731 9015 3731 9053
TIME...MOT...LOC 0048Z 242DEG 47KT 3736 9021

$$

TRUETT

1 follow-up statement

730 
WWUS53 KLSX 200106
SVSLSX

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

MOC123-200116-
/O.EXP.KLSX.TO.W.0033.000000T0000Z-110420T0115Z/
MADISON MO-
806 PM CDT TUE APR 19 2011

...THE TORNADO WARNING FOR SOUTHEASTERN MADISON COUNTY WILL EXPIRE AT
815 PM CDT...

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 9 PM.

LAT...LON 3749 9015 3732 9014 3731 9015 3731 9053
TIME...MOT...LOC 0106Z 242DEG 47KT 3747 8995

$$

TRUETT

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, 7:30 PM CDT	Tornado Warning	LSX	Saint Louis, City of Saint Louis	45 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, 7:54 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

Nearby

Tornado Warnings in Missouri, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.