Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 271, NWS St. Louis, MO

September 6, 20126 counties in Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 6, 2012, 4:02 PM CDT for 6 counties in Missouri; Monroe County, Illinois. It was in force for 43 min. 12 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 6, 2012, 4:02 PM CDT (21:02 UTC)
Expired: Sep 6, 2012, 4:45 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Monroe County, IL, Franklin County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 49 km from the middle of the area, began a volume at 21:05 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 6, 4:05 PM CDT	HAIL 0.7	1 N Mapaville, MO
Sep 6, 4:14 PM CDT	TSTM WND DMG	Augusta, MO	ONE AND A HALF FOOT DIAMTER OAK TREE SNAPPED ABOUT 15 FEET UP.
Sep 6, 4:15 PM CDT	HAIL 1	3 W Festus, MO	HALF INCH TO ONE INCH HAIL.
Sep 6, 4:18 PM CDT	TSTM WND DMG	Eureka, MO	EIGHT INCH DIAMTER BRADFORD PEAR SNAPPED.
Sep 6, 4:18 PM CDT	TSTM WND DMG	Pacific, MO	SIX TO EIGHT INCH DIAMTER TREE LIMBS DOWN ON SOUTH SIDE OF PACIFIC NEAR HIGHWAY N AND WESTLAKE DRIVE.
Sep 6, 4:20 PM CDT	TSTM WND DMG	High Ridge, MO	2 LIMBS...APPROXIMATELY 5 INCH IN DIAMETER...SNAPPED OFF BY HIGH WINDS
Sep 6, 4:26 PM CDT	TSTM WND GST 43	3 W Chesterfield, MO
Sep 6, 4:33 PM CDT	TSTM WND DMG	Sunset Hills, MO	SIX INCH DIAMTER TREE LIMBS DOWN.
Sep 6, 4:35 PM CDT	TSTM WND GST 52	Kirkwood, MO
Sep 6, 4:40 PM CDT	TSTM WND DMG	Oakville, MO	6 INCH DIAMETER TREE SPLIT...RELAYED THROUGH THE ST. LOUIS COUNTY EOC
Sep 6, 4:40 PM CDT	TSTM WND GST 45	Olympian Village, MO
Sep 6, 4:40 PM CDT	TSTM WND GST 60	Oakville, 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 6, 12:28 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.0 hours before the alert went out and 275 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: 2016 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 681 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

177 
WUUS53 KLSX 062102
SVRLSX
ILC133-MOC071-099-183-189-219-221-062145-
/O.NEW.KLSX.SV.W.0271.120906T2102Z-120906T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
402 PM CDT THU SEP 6 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHWESTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 445 PM CDT

* AT 401 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM TRELOAR TO VILLA RIDGE TO 7 MILES EAST OF
  RICHWOODS...AND MOVING EAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
           BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  GRAY SUMMIT...PACIFIC...DE SOTO...CEDAR HILL...HILLSBORO...
  EUREKA...BYRNES MILL...FESTUS...HIGH RIDGE...ANTONIA...LAKE ST.
  LOUIS...WILDWOOD...CRYSTAL CITY...HERCULANEUM...PEVELY...
  BARNHART...MURPHY...DARDENNE PRAIRIE...O'FALLON AND ELLISVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3800 9067 3855 9096 3872 9125 3883 9070
      3849 9027 3810 9028 3802 9061 3807 9061
      3807 9064 3801 9064
TIME...MOT...LOC 2102Z 269DEG 36KT 3867 9111 3849 9085
          3820 9069

HAIL...<.75IN
WIND...60 MPH

$$

GLASS

3 follow-up statements

268 
WWUS53 KLSX 062118
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
418 PM CDT THU SEP 6 2012

ILC133-MOC071-099-183-189-219-221-062145-
/O.CON.KLSX.SV.W.0271.000000T0000Z-120906T2145Z/
MONROE IL-FRANKLIN MO-JEFFERSON MO-ST. CHARLES MO-ST. LOUIS MO-
WARREN MO-WASHINGTON MO-
418 PM CDT THU SEP 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WASHINGTON...SOUTHEASTERN WARREN...SOUTHWESTERN ST. LOUIS...
SOUTHWESTERN ST. CHARLES...JEFFERSON...EASTERN FRANKLIN AND WESTERN
MONROE COUNTIES UNTIL 445 PM CDT...

AT 414 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM DUTZOW TO PACIFIC TO HILLSBORO...AND MOVING EAST
AT 40 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS REPORTED TREE LIMBS DOWN IN VILLA  
         RIDGE WITH THIS STORM. 1 INCH DIAMETER HAIL WAS ALSO        
         REPORTED NEAR FESTUS.

IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
         BROKEN.

LOCATIONS IMPACTED INCLUDE...
EUREKA...BYRNES MILL...HIGH RIDGE...FESTUS...ANTONIA...LAKE ST.
LOUIS...WILDWOOD...CRYSTAL CITY...HERCULANEUM...PEVELY...BARNHART...
DARDENNE PRAIRIE...MURPHY...O'FALLON...ELLISVILLE...BALLWIN...
CLARKSON VALLEY...COTTLEVILLE...ARNOLD AND WELDON SPRING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3800 9067 3855 9096 3872 9125 3883 9070
      3849 9027 3810 9028 3802 9061 3807 9061
      3807 9064 3801 9064
TIME...MOT...LOC 2118Z 269DEG 36KT 3867 9091 3849 9065
          3820 9050

HAIL...<.75IN
WIND...60 MPH

$$

KANOFSKY

366 
WWUS53 KLSX 062135
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
435 PM CDT THU SEP 6 2012

MOC183-219-062145-
/O.CAN.KLSX.SV.W.0271.000000T0000Z-120906T2145Z/
ST. CHARLES MO-WARREN MO-
435 PM CDT THU SEP 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN AND
SOUTHWESTERN ST. CHARLES COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.

LAT...LON 3800 9067 3832 9076 3845 9074 3858 9079
      3863 9045 3849 9027 3810 9028 3802 9061
      3807 9061 3807 9064 3801 9064
TIME...MOT...LOC 2135Z 278DEG 40KT 3842 9052 3813 9037

$$

ILC133-MOC071-099-189-221-062145-
/O.CON.KLSX.SV.W.0271.000000T0000Z-120906T2145Z/
MONROE IL-FRANKLIN MO-JEFFERSON MO-ST. LOUIS MO-WASHINGTON MO-
435 PM CDT THU SEP 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
WASHINGTON...SOUTHWESTERN ST. LOUIS...JEFFERSON...EAST CENTRAL
FRANKLIN AND WESTERN MONROE COUNTIES UNTIL 445 PM CDT...

AT 433 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM HOUSE SPRINGS TO OLYMPIAN VILLAGE...AND MOVING
EAST AT 45 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
         BROKEN.

LOCATIONS IMPACTED INCLUDE...
FESTUS...ANTONIA...DES PERES...FENTON...CRYSTAL CITY...HERCULANEUM...
PEVELY...KIRKWOOD...SUNSET HILLS...BARNHART...OAKLAND...CRESTWOOD...
ARNOLD...OAKVILLE...MEHLVILLE...LAKESHIRE...VALMEYER...FOUNTAIN...
HARRISONVILLE AND KIMMSWICK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3800 9067 3832 9076 3845 9074 3858 9079
      3863 9045 3849 9027 3810 9028 3802 9061
      3807 9061 3807 9064 3801 9064
TIME...MOT...LOC 2135Z 278DEG 40KT 3842 9052 3813 9037

HAIL...<.75IN
WIND...60 MPH

$$

KANOFSKY

154 
WWUS53 KLSX 062152
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
452 PM CDT THU SEP 6 2012

ILC133-MOC071-099-189-221-062202-
/O.EXP.KLSX.SV.W.0271.000000T0000Z-120906T2145Z/
MONROE IL-FRANKLIN MO-JEFFERSON MO-ST. LOUIS MO-WASHINGTON MO-
452 PM CDT THU SEP 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WASHINGTON...
SOUTHWESTERN ST. LOUIS...JEFFERSON...EAST CENTRAL FRANKLIN AND
WESTERN MONROE COUNTIES WAS REISSUED...

PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM CDT.

LAT...LON 3800 9067 3832 9076 3845 9074 3858 9079
      3863 9045 3849 9027 3810 9028 3802 9061
      3807 9061 3807 9064 3801 9064
TIME...MOT...LOC 2135Z 278DEG 40KT 3841 9052 3811 9037

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 1:44 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	46 min
Sep 6, 2:28 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Osage	47 min
Sep 6, 2:31 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	44 min
Sep 6, 3:00 PM CDT	Flash Flood Warning	LSX	Crawford	5 hr
Sep 6, 3:13 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois, Washington	27 min
Sep 6, 3:15 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	45 min
Sep 6, 3:31 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Washington	44 min
Sep 6, 3:39 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	54 min
Sep 6, 3:58 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	47 min
Sep 6, 4:20 PM CDT	Severe Thunderstorm Warning	LSX	Madison	40 min
Sep 6, 4:38 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Louis	37 min
Sep 6, 5:18 PM CDT	Areal Flood Advisory	LSX	Madison, Saint Francois	3 hr

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.