Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 117, NWS St. Louis, MO

April 28, 2012Lincoln County, Saint Charles County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 5:19 PM CDT for Lincoln County, Saint Charles County, Warren County, Missouri. It was in force for 41 min. 13 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 28, 2012, 5:19 PM CDT (22:19 UTC)
Expired
Apr 28, 2012, 6:00 PM CDT
In force
41 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
1.75 in
Wind
50.0 mph

Counties Lincoln County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 16 km from the middle of the area, began a volume at 22:20 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 28, 5:20 PM CDTHAIL 1.752 N Wright City, MO
Apr 28, 5:28 PM CDTHAIL 2.75Wentzville, MO
Apr 28, 5:30 PM CDTHAIL 1.752 W Wentzville, MO
Apr 28, 5:33 PM CDTTSTM WND DMGWentzville, MOPLYWOOD AND OTHER SMALL PIECES OF DEBRIS ON WESTBOUND LANES OF INTERSTATE 70 BETWEEN MILE MARKERS 212 AND 213.
Apr 28, 5:34 PM CDTHAIL 1.75Wentzville, MO
Apr 28, 5:35 PM CDTHAIL 2.75Flint Hill, MO
Apr 28, 5:39 PM CDTHAIL 1O'Fallon, MOSOUTH SIDE OF TOWN.
Apr 28, 5:41 PM CDTHAIL 3Wentzville, MO
Apr 28, 5:42 PM CDTHAIL 1.75St. Paul, MO
Apr 28, 5:45 PM CDTHAIL 22 Nw O'Fallon, MO
Apr 28, 5:48 PM CDTHAIL 2.75O'Fallon, MORELAYED FROM THE PUBLIC
Apr 28, 5:50 PM CDTTSTM WND DMGSt. Peters, MOAT INTERSECTION OF KIMBERLY AND ST. PETERS HOWELL.
Apr 28, 5:50 PM CDTHAIL 1.75St. Paul, MO

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 28, 1:48 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 231 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 12:00Z on 2012-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2012-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 681 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1019 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
681 m²/s²
0-3 km storm-relative helicity
811 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

945 
WUUS53 KLSX 282219
SVRLSX
MOC113-183-219-282300-
/O.NEW.KLSX.SV.W.0117.120428T2219Z-120428T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
519 PM CDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  WESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 600 PM CDT

* AT 516 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WRIGHT
  CITY...AND MOVING EAST AT 35 MPH.

  HAZARD...GOLF BALL SIZE HAIL.

  SOURCE...TRAINED WEATHER SPOTTERS.

  IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

  GOLF BALL SIZE HAIL WAS REPORTED NEAR WRIGHT CITY WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  WENTZVILLE...LAKE ST. LOUIS...ST. PAUL...DARDENNE PRAIRIE...
  O'FALLON...COTTLEVILLE...WELDON SPRING...ST. PETERS...MOSCOW
  MILLS...NEW MELLE...FORISTELL...FLINT HILL...OLD MONROE AND
  KAMPVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3895 9067 3892 9066 3889 9063 3887 9058
      3888 9054 3890 9052 3884 9053 3868 9061
      3869 9066 3865 9071 3875 9117 3901 9112
TIME...MOT...LOC 2219Z 280DEG 32KT 3885 9100

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...<50 MPH

$$

KANOFSKY
2 follow-up statements
658 
WWUS53 KLSX 282235
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
535 PM CDT SAT APR 28 2012

MOC219-282244-
/O.CAN.KLSX.SV.W.0117.000000T0000Z-120428T2300Z/
WARREN MO-
535 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WARREN COUNTY IS
CANCELLED...

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

LAT...LON 3895 9068 3889 9063 3887 9058 3888 9054
      3890 9052 3884 9053 3868 9061 3869 9066
      3865 9071 3872 9097 3887 9097 3898 9094
      3898 9090
TIME...MOT...LOC 2234Z 280DEG 32KT 3882 9083

$$

MOC113-183-282300-
/O.CON.KLSX.SV.W.0117.000000T0000Z-120428T2300Z/
LINCOLN MO-ST. CHARLES MO-
535 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN ST.
CHARLES AND SOUTHEASTERN LINCOLN COUNTIES UNTIL 600 PM CDT...

AT 533 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WENTZVILLE...
AND MOVING EAST AT 35 MPH.

HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE DAMAGE...
         WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

GOLF BALL SIZE HAIL WAS REPORTED IN WENTZVILLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
LAKE ST. LOUIS...ST. PAUL...DARDENNE PRAIRIE...O'FALLON...
COTTLEVILLE...WELDON SPRING...ST. PETERS...HARVESTER...OLD MONROE AND
KAMPVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3895 9068 3889 9063 3887 9058 3888 9054
      3890 9052 3884 9053 3868 9061 3869 9066
      3865 9071 3872 9097 3887 9097 3898 9094
      3898 9090
TIME...MOT...LOC 2234Z 280DEG 32KT 3882 9083

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60 MPH

$$

KANOFSKY
388 
WWUS53 KLSX 282238
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
538 PM CDT SAT APR 28 2012

MOC113-183-282300-
/O.CON.KLSX.SV.W.0117.000000T0000Z-120428T2300Z/
LINCOLN MO-ST. CHARLES MO-
538 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN ST.
CHARLES AND SOUTHEASTERN LINCOLN COUNTIES UNTIL 600 PM CDT...

AT 537 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR LAKE ST.
LOUIS...AND MOVING EAST AT 35 MPH.

THIS IS A VERY DANGEROUS STORM.

HAZARD...BASEBALL SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...EXTENSIVE DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

IN ADDITION...BASEBALL SIZE HAIL WAS REPORTED IN FLINT HILL WITH 
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ST. PAUL...DARDENNE PRAIRIE...O'FALLON...COTTLEVILLE...WELDON
SPRING...ST. PETERS AND KAMPVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3895 9068 3889 9063 3887 9058 3888 9054
      3890 9052 3884 9053 3868 9061 3869 9066
      3865 9071 3872 9097 3887 9097 3898 9094
      3898 9090
TIME...MOT...LOC 2238Z 280DEG 32KT 3881 9079

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...60 MPH

$$

KANOFSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 1:14 PM CDTSevere Thunderstorm WarningLSXCallaway, Montgomery46 min
Apr 28, 1:50 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Warren40 min
Apr 28, 2:26 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Warren49 min
Apr 28, 3:05 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis, City of Saint Louis40 min
Apr 28, 3:45 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis45 min
Apr 28, 4:12 PM CDTSevere Thunderstorm WarningLSXAudrain, Boone, Callaway38 min
Apr 28, 4:49 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington41 min
Apr 28, 4:55 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Warren50 min
Apr 28, 5:27 PM CDTSevere Thunderstorm WarningLSXCrawford, Jefferson, Saint Francois, Washington48 min
Apr 28, 5:50 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis40 min
Apr 28, 6:01 PM CDTTornado WarningLSXSaint Charles, Saint Louis, City of Saint Louis29 min
Apr 28, 6:10 PM CDTSevere Thunderstorm WarningLSXJefferson, Sainte Genevieve, Saint Francois, Washington34 min
Apr 28, 6:27 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis48 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2012Every severe thunderstorm warning in 2012

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.