Alert archive / Missouri / Tornado Warnings in 2011

Tornado Warning 45, NWS St. Louis, MO

April 22, 2011Franklin County, Gasconade County, Saint Charles County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 22, 2011, 7:20 PM CDT for Franklin County, Gasconade County, Saint Charles County, Missouri. It was in force for 40 min. 6 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 22, 2011, 7:20 PM CDT (00:20 UTC)
Expired
Apr 22, 2011, 8:00 PM CDT
In force
40 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

Counties Franklin County, MO, Gasconade County, MO, Saint Charles County, MO

The radar

The St Louis radar (KLSX), 41 km from the middle of the area, began a volume at 00:20 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

TimeReportWhereRemark
Apr 22, 7:44 PM CDTHAIL 0.75Union, MO
Apr 22, 7:46 PM CDTHAIL 1.75St. Clair, MO
Apr 22, 7:50 PM CDTFUNNEL CLOUDSt. Clair, MO
Apr 22, 7:51 PM CDTHAIL 1.75Villa Ridge, MO
Apr 22, 7:56 PM CDTTORNADOSt. Clair, MOPOSSIBLE RAIN WRAPPED TORNADO. DEBRIS OBSERVED IN FIELD OFF OF HIGHWAY 30 NEAR ST CLAIR LONEDELL CITY LIMITS
Apr 22, 8:04 PM CDTFUNNEL CLOUDLonedell, MOCROSSED OVER HIGHWAY N TOWARDS HIGHWAY 30 AND CEDER HILL

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.

IssuedProductOfficeLasted
Apr 22, 3:34 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.3 hours before the alert went out and 282 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2011-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 342 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 351 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
342 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
492 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
351 m²/s²
0-3 km storm-relative helicity
346 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

430 
WFUS53 KLSX 230020
TORLSX
MOC071-073-183-230100-
/O.NEW.KLSX.TO.W.0045.110423T0020Z-110423T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
720 PM CDT FRI APR 22 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  EXTREME SOUTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 800 PM CDT

* AT 716 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR GERALD...OR 10 MILES EAST OF OWENSVILLE...
  AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  UNION...WASHINGTON...ST. CLAIR...VILLA RIDGE...GRAY SUMMIT...
  PACIFIC...BEAUFORT...PARKWAY...AUGUSTA...LONEDELL...LESLIE...NOSER
  MILL...LYON...PINEY PARK...MOSELLE...ROBERTSVILLE AND CATAWISSA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

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 3849 9141 3856 9101 3855 9097 3857 9096
      3861 9075 3830 9075 3830 9077 3830 9141
TIME...MOT...LOC 0020Z 267DEG 36KT 3836 9125

$$

GLASS
2 follow-up statements
968 
WWUS53 KLSX 230033
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
733 PM CDT FRI APR 22 2011

MOC073-230044-
/O.CAN.KLSX.TO.W.0045.000000T0000Z-110423T0100Z/
GASCONADE MO-
733 PM CDT FRI APR 22 2011

...THE TORNADO WARNING FOR GASCONADE COUNTY IS CANCELLED...

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

LAT...LON 3851 9126 3856 9101 3855 9097 3857 9096
      3861 9075 3834 9075 3831 9076 3830 9077
      3830 9128
TIME...MOT...LOC 0034Z 261DEG 36KT 3837 9111

$$

MOC071-183-230100-
/O.CON.KLSX.TO.W.0045.000000T0000Z-110423T0100Z/
FRANKLIN MO-ST. CHARLES MO-
733 PM CDT FRI APR 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EXTREME SOUTHWESTERN ST.
CHARLES AND FRANKLIN COUNTIES UNTIL 800 PM CDT...

AT 729 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR BEAUFORT...OR 10 MILES NORTH OF SULLIVAN...
MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  UNION...ST. CLAIR...WASHINGTON...VILLA RIDGE...GRAY SUMMIT...
  PACIFIC...PARKWAY...AUGUSTA...LONEDELL...PINEY PARK...MOSELLE...
  ROBERTSVILLE AND CATAWISSA.

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 3851 9126 3856 9101 3855 9097 3857 9096
      3861 9075 3834 9075 3831 9076 3830 9077
      3830 9128
TIME...MOT...LOC 0034Z 261DEG 36KT 3837 9111

$$

GLASS
159 
WWUS53 KLSX 230049
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
749 PM CDT FRI APR 22 2011

MOC071-183-230100-
/O.CON.KLSX.TO.W.0045.000000T0000Z-110423T0100Z/
FRANKLIN MO-ST. CHARLES MO-
749 PM CDT FRI APR 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EXTREME SOUTHWESTERN ST.
CHARLES AND EASTERN FRANKLIN COUNTIES UNTIL 800 PM CDT...

AT 746 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR ST. CLAIR...MOVING EAST AT 40 MPH.

IN ADDITION...LARGE HAIL TO THE SIZE OF GOLFBALLS WILL OCCUR WITH 
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  VILLA RIDGE...GRAY SUMMIT...PACIFIC...AUGUSTA...LONEDELL...
  MOSELLE...ROBERTSVILLE AND CATAWISSA.

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 3831 9117 3846 9113 3856 9101 3855 9097
      3857 9096 3861 9075 3834 9075 3830 9077
TIME...MOT...LOC 0049Z 261DEG 36KT 3839 9092

$$

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 22, 7:11 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Saint Charles, Warren49 min
Apr 22, 7:36 PM CDTTornado WarningLSXSaint Charles, Saint Louis39 min
Apr 22, 7:44 PM CDTTornado WarningLSXReynolds16 min
Apr 22, 7:56 PM CDTTornado WarningLSXFranklin, Jefferson, Saint Louis42 min
Apr 22, 7:59 PM CDTTornado WarningLSXSaint Louis, City of Saint Louis46 min
Apr 22, 8:21 PM CDTTornado WarningLSXJefferson, Saint Louis39 min
Apr 22, 9:00 PM CDTFlash Flood WarningLSXFranklin, Jefferson, Saint Louis5 hr
Apr 22, 10:18 PM CDTRiver Flood WarningLSXJefferson8 days
Apr 22, 10:55 PM CDTFlash Flood WarningLSXCrawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more6 hr
Apr 22, 11:10 PM CDTRiver Flood WarningLSXLewis25 hr
Apr 22, 11:12 PM CDTTornado WarningLSXIron, Madison, Sainte Genevieve, Saint Francois37 min
Apr 22, 11:53 PM CDTRiver Flood WarningLSXSaint Louis, City of Saint Louis14 days
Apr 23, 1:21 AM CDTSevere Thunderstorm WarningLSXIron, Madison, Reynolds, Sainte Genevieve, Saint Francois30 min
Apr 23, 1:47 AM CDTRiver Flood WarningLSXGasconade, Montgomery9 days
Apr 23, 4:23 AM CDTFlash Flood WarningLSXCrawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more8 hr
Apr 23, 6:45 AM CDTRiver Flood WarningLSXLewis39 hr
Apr 23, 12:29 PM CDTFlash Flood WarningLSXCrawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more6 hr
Apr 23, 4:59 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds46 min
Apr 23, 5:27 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington48 min
Apr 23, 5:41 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Jefferson, Washington33 min
Apr 23, 6:22 PM CDTFlash Flood WarningLSXCrawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more6 hr

Nearby

Tornado Warnings in Missouri, 2011Every tornado warning in 2011Tornadoes 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.