Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 121, NWS St. Louis, MO

April 28, 20124 counties in Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 6:10 PM CDT for 4 counties in Missouri; Monroe County, Illinois. It was in force for 34 min. 2 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, 6:10 PM CDT (23:10 UTC)
Expired: Apr 28, 2012, 6:44 PM CDT
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.75 in
Wind: 60.0 mph

Counties Monroe County, IL, Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 75 km from the middle of the area, began a volume at 23:11 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 28, 6:11 PM CDT	HAIL 2.5	De Soto, MO	HAIL COVERING GROUND. 55MPH WIND GUSTS MEASURED AS WELL.
Apr 28, 6:26 PM CDT	HAIL 1.5	3 Se Hematite, 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.

Issued	Product	Office	Lasted
Apr 28, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 28, 5:15 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 271 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: 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.

097 
WUUS53 KLSX 282310
SVRLSX
ILC133-MOC099-186-187-221-290000-
/O.NEW.KLSX.SV.W.0121.120428T2310Z-120429T0000Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
  EXTREME NORTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...
  EAST CENTRAL WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 700 PM CDT

* AT 607 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DE SOTO...
  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.

GOLFBALL SIZE HAIL WAS REPORTED IN DE SOTO WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  DE SOTO...HILLSBORO...FESTUS...HERCULANEUM...CRYSTAL CITY...
  OLYMPIAN VILLAGE...BLOOMSDALE...VICTORIA...VALLES MILL...
  HEMATITE...MAPAVILLE...CHALFIN BRIDGE...MONROE CITY...
  MADONNAVILLE...MAEYSTOWN...FULTS AND KIDD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3823 9074 3829 9020 3811 9013 3809 9020
      3807 9017 3807 9015 3806 9013 3804 9013
      3802 9010 3800 9010 3800 9071
TIME...MOT...LOC 2310Z 266DEG 39KT 3811 9058

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

$$

KANOFSKY

3 follow-up statements

353 
WWUS53 KLSX 282313
SVSLSX

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

ILC133-MOC099-186-187-221-290000-
/O.CON.KLSX.SV.W.0121.000000T0000Z-120429T0000Z/
MONROE IL-JEFFERSON MO-STE. GENEVIEVE MO-ST. FRANCOIS MO-
WASHINGTON MO-
613 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
WASHINGTON...EXTREME NORTHERN ST. FRANCOIS...NORTHWESTERN STE.
GENEVIEVE...SOUTHERN JEFFERSON AND SOUTHWESTERN MONROE COUNTIES UNTIL
700 PM CDT...

AT 611 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DE SOTO...AND
MOVING EAST AT 45 MPH.

HAZARD...TENNIS 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.

IN ADDITION...TENNIS BALL SIZE HAIL WAS REPORTED IN DE SOTO WITH 
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
FESTUS...HERCULANEUM...CRYSTAL CITY...OLYMPIAN VILLAGE...
BLOOMSDALE...VICTORIA...VALLES MILL...HEMATITE...MAPAVILLE...CHALFIN
BRIDGE...MONROE CITY...MADONNAVILLE...MAEYSTOWN...FULTS AND KIDD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3823 9074 3829 9020 3811 9013 3809 9020
      3807 9017 3807 9015 3806 9013 3804 9013
      3802 9010 3800 9010 3800 9071
TIME...MOT...LOC 2313Z 266DEG 39KT 3811 9054

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...60 MPH

$$

KANOFSKY

342 
WWUS53 KLSX 282323
SVSLSX

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

MOC221-282333-
/O.CAN.KLSX.SV.W.0121.000000T0000Z-120429T0000Z/
WASHINGTON MO-
623 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WASHINGTON COUNTY
IS CANCELLED...

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

LAT...LON 3800 9062 3825 9061 3829 9020 3811 9013
      3809 9020 3807 9017 3807 9015 3806 9013
      3804 9013 3802 9010 3800 9010
TIME...MOT...LOC 2323Z 266DEG 39KT 3811 9040

$$

ILC133-MOC099-186-187-290000-
/O.CON.KLSX.SV.W.0121.000000T0000Z-120429T0000Z/
MONROE IL-JEFFERSON MO-STE. GENEVIEVE MO-ST. FRANCOIS MO-
623 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME
NORTHERN ST. FRANCOIS...NORTHWESTERN STE. GENEVIEVE...SOUTHEASTERN
JEFFERSON AND SOUTHWESTERN MONROE COUNTIES UNTIL 700 PM CDT...

AT 620 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR OLYMPIAN
VILLAGE...AND MOVING EAST AT 45 MPH.

HAZARD...TENNIS 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.

LOCATIONS IMPACTED INCLUDE...
HERCULANEUM...CRYSTAL CITY...BLOOMSDALE...CHALFIN BRIDGE...MONROE
CITY...MADONNAVILLE...MAEYSTOWN...FULTS AND KIDD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3800 9062 3825 9061 3829 9020 3811 9013
      3809 9020 3807 9017 3807 9015 3806 9013
      3804 9013 3802 9010 3800 9010
TIME...MOT...LOC 2323Z 266DEG 39KT 3811 9040

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...60 MPH

$$

KANOFSKY

702 
WWUS53 KLSX 282344
SVSLSX

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

ILC133-MOC099-186-187-282354-
/O.CAN.KLSX.SV.W.0121.000000T0000Z-120429T0000Z/
MONROE IL-JEFFERSON MO-STE. GENEVIEVE MO-ST. FRANCOIS MO-
644 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHERN ST.
FRANCOIS...NORTHWESTERN STE. GENEVIEVE...SOUTHEASTERN JEFFERSON AND
SOUTHWESTERN MONROE COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 10 PM.

LAT...LON 3800 9062 3825 9061 3829 9020 3811 9013
      3809 9020 3807 9017 3807 9015 3806 9013
      3804 9013 3802 9010 3800 9010
TIME...MOT...LOC 2344Z 266DEG 39KT 3812 9011

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 1:14 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery	46 min
Apr 28, 1:50 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	40 min
Apr 28, 2:26 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	49 min
Apr 28, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	40 min
Apr 28, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	45 min
Apr 28, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	38 min
Apr 28, 4:49 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	41 min
Apr 28, 4:55 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	50 min
Apr 28, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	41 min
Apr 28, 5:27 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Jefferson, Saint Francois, Washington	48 min
Apr 28, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	40 min
Apr 28, 6:01 PM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	29 min
Apr 28, 6:27 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 min
Apr 28, 3:59 PM CDT	Tornado Warning	LSX	Saint Clair	31 min
Apr 28, 4:22 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	38 min
Apr 28, 4:28 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	47 min
Apr 28, 4:56 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	49 min
Apr 28, 5:13 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	47 min
Apr 28, 5:38 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	37 min
Apr 28, 6:17 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	33 min
Apr 28, 6:35 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	25 min
Apr 28, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	52 min
Apr 28, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	32 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2012 Severe Thunderstorm Warnings in Illinois, 2012 Every 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.