Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 310, NWS St. Louis, MO

September 25, 2012Calhoun County, Jersey County, Madison County, Illinois; Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 25, 2012, 5:09 PM CDT for Calhoun County, Jersey County, Madison County, Illinois; Saint Charles County, Saint Louis County, Missouri. It was in force for 51 min. 3 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: Sep 25, 2012, 5:09 PM CDT (22:09 UTC)
Expired: Sep 25, 2012, 6:00 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Calhoun County, IL, Jersey County, IL, Madison County, IL, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 22:12 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
Sep 25, 5:34 PM CDT	HAIL 0.25	Bridgeton, MO	AT I-70 AND ROCK RD
Sep 25, 5:39 PM CDT	HAIL 0.25	St. Ann, MO	AT WOODSON AND ROCK RD
Sep 25, 5:41 PM CDT	HAIL 0.25	St. Ann, 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
Sep 25, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.2 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: 221 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

161 
WUUS53 KLSX 252209
SVRLSX
ILC013-083-119-MOC183-189-252300-
/O.NEW.KLSX.SV.W.0310.120925T2209Z-120925T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
509 PM CDT TUE SEP 25 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHERN CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHEASTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 600 PM CDT

* AT 503 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  COTTLEVILLE...AND MOVING EAST AT 35 MPH.

  HAZARD...HALF DOLLAR SIZE HAIL AND 60 MPH WIND GUSTS.

  SOURCE...TRAINED WEATHER SPOTTERS.  QUARTER SIZE HAIL HAS BEEN 
  REPORTED WITH THIS STORM AS IT MOVED THROUGH WENTZVILLE.

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

* LOCATIONS IMPACTED INCLUDE...
  ST. CHARLES...MARYLAND HEIGHTS...BRIDGETON...ST. ANN...WOODSON
  TERRACE...LAMBERT FIELD...ST. JOHN...HAZELWOOD...BEL-RIDGE...
  BERKELEY...KINLOCH...COOL VALLEY...FLORISSANT...FERGUSON...
  JENNINGS...DELLWOOD...BLACK JACK...BELLEFONTAINE NEIGHBORS...
  RIVERVIEW AND SPANISH LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3871 9021 3873 9021 3875 9018 3877 9017
      3875 9019 3871 9026 3869 9066 3885 9074
      3906 9015 3900 9015 3898 9012 3873 9004
TIME...MOT...LOC 2209Z 250DEG 32KT 3880 9057

HAIL...1.25IN
WIND...60 MPH

$$

BRITT

4 follow-up statements

283 
WWUS53 KLSX 252220
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
520 PM CDT TUE SEP 25 2012

ILC013-083-119-MOC183-189-252300-
/O.CON.KLSX.SV.W.0310.000000T0000Z-120925T2300Z/
JERSEY IL-MADISON IL-CALHOUN IL-ST. CHARLES MO-ST. LOUIS MO-
520 PM CDT TUE SEP 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
ST. LOUIS...NORTHEASTERN ST. CHARLES...EXTREME SOUTHERN CALHOUN...
WESTERN MADISON AND SOUTHEASTERN JERSEY COUNTIES UNTIL 600 PM CDT...

AT 517 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR HARVESTER...
AND MOVING EAST AT 40 MPH.

HAZARD...HALF DOLLAR SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
MARYLAND HEIGHTS...BRIDGETON...ST. ANN...LAMBERT FIELD...WOODSON
TERRACE...ST. JOHN...HAZELWOOD...BEL-RIDGE...BERKELEY...KINLOCH...
NORMANDY...COOL VALLEY...FLORISSANT...FERGUSON...DELLWOOD...
JENNINGS...BLACK JACK...BELLEFONTAINE NEIGHBORS...RIVERVIEW AND
SPANISH LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

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

&&

LAT...LON 3871 9021 3873 9021 3875 9018 3877 9017
      3875 9019 3871 9026 3869 9066 3885 9074
      3906 9015 3900 9015 3898 9012 3873 9004
TIME...MOT...LOC 2220Z 253DEG 35KT 3877 9051

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60 MPH

$$

BRITT

011 
WWUS53 KLSX 252232
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
532 PM CDT TUE SEP 25 2012

ILC013-083-119-MOC183-189-252300-
/O.CON.KLSX.SV.W.0310.000000T0000Z-120925T2300Z/
JERSEY IL-MADISON IL-CALHOUN IL-ST. CHARLES MO-ST. LOUIS MO-
532 PM CDT TUE SEP 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
ST. LOUIS...NORTHEASTERN ST. CHARLES...EXTREME SOUTHERN CALHOUN...
WESTERN MADISON AND SOUTHEASTERN JERSEY COUNTIES UNTIL 600 PM CDT...

AT 526 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR MARYLAND
HEIGHTS...AND MOVING EAST AT 40 MPH.

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

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
LAMBERT FIELD...WOODSON TERRACE...HAZELWOOD...ST. JOHN...BERKELEY...
BEL-RIDGE...KINLOCH...FLORISSANT...COOL VALLEY...NORMANDY...
FERGUSON...DELLWOOD...JENNINGS...BLACK JACK...BELLEFONTAINE
NEIGHBORS...RIVERVIEW...SPANISH LAKE...GODFREY...ALTON AND WOOD
RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

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

&&

LAT...LON 3871 9021 3873 9021 3875 9018 3877 9017
      3875 9019 3871 9026 3869 9066 3885 9074
      3906 9015 3900 9015 3898 9012 3873 9004
TIME...MOT...LOC 2231Z 263DEG 35KT 3873 9039

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60 MPH

$$

BRITT

122 
WWUS53 KLSX 252243
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
543 PM CDT TUE SEP 25 2012

ILC013-252252-
/O.CAN.KLSX.SV.W.0310.000000T0000Z-120925T2300Z/
CALHOUN IL-
543 PM CDT TUE SEP 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHERN CALHOUN
COUNTY IS CANCELLED...

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

LAT...LON 3871 9021 3873 9021 3875 9018 3877 9017
      3875 9019 3871 9026 3870 9046 3896 9043
      3906 9015 3900 9015 3898 9012 3873 9004
TIME...MOT...LOC 2242Z 263DEG 35KT 3874 9025

$$

ILC083-119-MOC183-189-252300-
/O.CON.KLSX.SV.W.0310.000000T0000Z-120925T2300Z/
JERSEY IL-MADISON IL-ST. CHARLES MO-ST. LOUIS MO-
543 PM CDT TUE SEP 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
ST. LOUIS...NORTHEASTERN ST. CHARLES...WESTERN MADISON AND
SOUTHEASTERN JERSEY COUNTIES UNTIL 600 PM CDT...

AT 540 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DELLWOOD...AND
MOVING EAST AT 40 MPH.

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

SOURCE...TRAINED WEATHER SPOTTERS.  DIME SIZE HAIL WAS REPORTED WITH 
THIS STORM IN BRIDGETON.

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

LOCATIONS IMPACTED INCLUDE...
BELLEFONTAINE NEIGHBORS...RIVERVIEW...SPANISH LAKE...GODFREY...
ALTON...WOOD RIVER...WEST ALTON...HARTFORD AND MITCHELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3871 9021 3873 9021 3875 9018 3877 9017
      3875 9019 3871 9026 3870 9046 3896 9043
      3906 9015 3900 9015 3898 9012 3873 9004
TIME...MOT...LOC 2242Z 263DEG 35KT 3874 9025

HAIL...1.00IN
WIND...60 MPH

$$

BRITT

852 
WWUS53 KLSX 252257
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
557 PM CDT TUE SEP 25 2012

ILC083-119-MOC183-189-252306-
/O.EXP.KLSX.SV.W.0310.000000T0000Z-120925T2300Z/
JERSEY IL-MADISON IL-ST. CHARLES MO-ST. LOUIS MO-
557 PM CDT TUE SEP 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. LOUIS...
NORTHEASTERN ST. CHARLES...WESTERN MADISON AND SOUTHEASTERN JERSEY
COUNTIES WILL EXPIRE AT 600 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

A NEW SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED FOR ST. LOUIS 
COUNTY FOR AN ANOTHER STORM UNTIL 630 PM CDT.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11 PM.

LAT...LON 3871 9021 3873 9021 3875 9018 3877 9017
      3875 9019 3871 9026 3870 9046 3896 9043
      3906 9015 3900 9015 3898 9012 3873 9004
TIME...MOT...LOC 2256Z 263DEG 35KT 3876 9008

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 3:38 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion	22 min
Sep 25, 4:36 AM CDT	Areal Flood Advisory	LSX	Pike	5 hr
Sep 25, 4:29 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	46 min
Sep 25, 4:39 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair	51 min
Sep 25, 5:05 PM CDT	Severe Thunderstorm Warning	LSX	Clinton	55 min
Sep 25, 5:07 PM CDT	Tornado Warning	LSX	Clinton	23 min
Sep 25, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair	18 min
Sep 25, 5:19 PM CDT	Tornado Warning	LSX	Washington	26 min
Sep 25, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Marion	47 min
Sep 25, 5:34 PM CDT	Tornado Warning Tornado observed	LSX	Washington	41 min
Sep 25, 5:43 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	62 min
Sep 25, 6:08 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	52 min
Sep 25, 6:14 PM CDT	Severe Thunderstorm Warning	LSX	Washington	46 min
Sep 25, 6:19 PM CDT	Areal Flood Advisory	LSX	Clinton, Marion, Washington	6 hr
Sep 25, 6:30 PM CDT	Severe Thunderstorm Warning	LSX	Marion	26 min
Sep 25, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Marion, Washington	45 min
Sep 25, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	46 min
Sep 25, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Warren	44 min
Sep 25, 5:48 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, City of Saint Louis	42 min
Sep 25, 6:16 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Osage	44 min
Sep 25, 6:22 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	38 min
Sep 25, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade	45 min
Sep 25, 6:55 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis	50 min

Nearby

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