Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 299, NWS St. Louis, MO

September 7, 20125 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 7, 2012, 6:22 PM CDT for 5 counties in Missouri. It was in force for 53 min. 4 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 7, 2012, 6:22 PM CDT (23:22 UTC)
Expired
Sep 7, 2012, 7:15 PM CDT
In force
53 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Franklin County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 60 km from the middle of the area, began a volume at 23:22 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
Sep 7, 6:35 PM CDTTSTM WND DMG10 N Potosi, MONUMEROUS LARGE TREE LIMBS BLOWN DOWN ON HIGHWAY 21 ABOUT 10 MILES NORTH OF POTOSI.
Sep 7, 6:35 PM CDTHAIL 0.710 N Potosi, MONUMEROUS LARGE TREE LIMBS BLOWN DOWN ON HIGHWAY 21 ABOUT 10 MILES NORTH OF POTOSI.
Sep 7, 6:43 PM CDTTSTM WND DMGDittmer, MOSEVERAL TREES BLOWN DOWN IN DITTMER NEAR HIGHWAY 30.
Sep 7, 6:51 PM CDTTSTM WND DMG2 Ene Hillsboro, MOSEVERAL TREES BLOWN DOWN ON AMY CLARK ROAD...EAST OF HILLSBORO.

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
Sep 7, 2:35 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.4 hours before the alert went out and 287 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 2012-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 367 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 12:00Z on 2012-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
367 J/kg
Mixed-layer CIN
-412 J/kg
Mixed-layer LCL
1436 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

163 
WUUS53 KLSX 072322
SVRLSX
MOC071-099-183-189-221-080015-
/O.NEW.KLSX.SV.W.0299.120907T2322Z-120908T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
622 PM CDT FRI SEP 7 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 715 PM CDT

* AT 617 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM WASHINGTON TO 5 MILES EAST OF SULLIVAN...AND
  MOVING EAST AT 40 MPH.

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

  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...
  VILLA RIDGE...GRAY SUMMIT...PACIFIC...WILDWOOD...EUREKA...CLARKSON
  VALLEY...ELLISVILLE...CEDAR HILL...BALLWIN...BYRNES MILL...
  MANCHESTER...HIGH RIDGE...TOWN AND COUNTRY...VALLEY PARK...
  HILLSBORO...MURPHY...DES PERES...DE SOTO...FENTON AND AUGUSTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3801 9063 3802 9061 3807 9062 3807 9064
      3800 9064 3806 9084 3820 9080 3820 9108
      3821 9095 3866 9095 3865 9043 3802 9051
      3800 9059
TIME...MOT...LOC 2323Z 282DEG 33KT 3855 9091 3819 9100

HAIL...0.75IN
WIND...60 MPH

$$

TRUETT
2 follow-up statements
505 
WWUS53 KLSX 072344
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
644 PM CDT FRI SEP 7 2012

MOC071-183-072354-
/O.CAN.KLSX.SV.W.0299.000000T0000Z-120908T0015Z/
FRANKLIN MO-ST. CHARLES MO-
644 PM CDT FRI SEP 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ST. CHARLES AND
EASTERN FRANKLIN COUNTIES IS CANCELLED...

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

LAT...LON 3806 9084 3820 9080 3820 9106 3821 9078
      3840 9074 3864 9073 3864 9043 3802 9051
      3800 9059 3801 9063 3802 9061 3807 9062
      3807 9064 3800 9064
TIME...MOT...LOC 2344Z 284DEG 38KT 3850 9067 3807 9066

$$

MOC099-189-221-080015-
/O.CON.KLSX.SV.W.0299.000000T0000Z-120908T0015Z/
JEFFERSON MO-ST. LOUIS MO-WASHINGTON MO-
644 PM CDT FRI SEP 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WASHINGTON...SOUTHWESTERN ST. LOUIS AND WESTERN JEFFERSON COUNTIES
UNTIL 715 PM CDT...

AT 643 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM EUREKA TO 6 MILES NORTHEAST OF OLD MINES...AND
MOVING EAST AT 45 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...
CLARKSON VALLEY...CEDAR HILL...ELLISVILLE...BALLWIN...BYRNES MILL...
HILLSBORO...MANCHESTER...DE SOTO...TOWN AND COUNTRY...HIGH RIDGE...
VALLEY PARK...MURPHY...DES PERES...FENTON...HOUSE SPRINGS...
SCOTSDALE...PARKDALE...PEERLESS PARK...VICTORIA AND OTTO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3806 9084 3820 9080 3820 9106 3821 9078
      3840 9074 3864 9073 3864 9043 3802 9051
      3800 9059 3801 9063 3802 9061 3807 9062
      3807 9064 3800 9064
TIME...MOT...LOC 2344Z 284DEG 38KT 3850 9067 3807 9066

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

$$

TRUETT
486 
WWUS53 KLSX 080007
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
707 PM CDT FRI SEP 7 2012

MOC099-189-221-080016-
/O.EXP.KLSX.SV.W.0299.000000T0000Z-120908T0015Z/
JEFFERSON MO-ST. LOUIS MO-WASHINGTON MO-
707 PM CDT FRI SEP 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON...
SOUTHWESTERN ST. LOUIS AND WESTERN JEFFERSON COUNTIES WILL EXPIRE AT
715 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
WESTERN JEFFERSON COUNTY AND INTO EASTERN JEFFERSON COUNTY.  A 
SEVERE THUNDERSTORM WARNING IS IN EFFECT FOR EASTERN JEFFERSON 
COUNTY UNTIL 745 PM.

LAT...LON 3806 9084 3820 9080 3820 9106 3821 9078
      3840 9074 3864 9073 3864 9043 3802 9051
      3800 9059 3801 9063 3802 9061 3807 9062
      3807 9064 3800 9064
TIME...MOT...LOC 0006Z 284DEG 38KT 3844 9038 3801 9037

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 3:02 PM CDTSevere Thunderstorm WarningLSXCrawford43 min
Sep 7, 3:18 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington42 min
Sep 7, 3:33 PM CDTSevere Thunderstorm WarningLSXBoone57 min
Sep 7, 3:36 PM CDTSevere Thunderstorm WarningLSXLincoln54 min
Sep 7, 3:51 PM CDTSevere Thunderstorm WarningLSXWashington39 min
Sep 7, 3:59 PM CDTSevere Thunderstorm WarningLSXWashington35 min
Sep 7, 4:13 PM CDTSevere Thunderstorm WarningLSXCallaway62 min
Sep 7, 4:18 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau42 min
Sep 7, 4:24 PM CDTSevere Thunderstorm WarningLSXIron51 min
Sep 7, 4:46 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Warren44 min
Sep 7, 4:50 PM CDTSevere Thunderstorm WarningLSXCole, Osage40 min
Sep 7, 5:00 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds45 min
Sep 7, 5:03 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis42 min
Sep 7, 5:13 PM CDTTornado WarningLSXIron, Madison, Reynolds32 min
Sep 7, 5:16 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve, Saint Francois30 min
Sep 7, 5:22 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis23 min
Sep 7, 5:24 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds31 min
Sep 7, 5:25 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Osage35 min
Sep 7, 5:49 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Warren41 min
Sep 7, 5:50 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Washington40 min
Sep 7, 6:00 PM CDTSevere Thunderstorm WarningLSXFranklin30 min
Sep 7, 6:03 PM CDTAreal Flood AdvisoryLSXIron, Reynolds6 hr
Sep 7, 6:41 PM CDTSevere Thunderstorm WarningLSXCrawford, Iron, Reynolds49 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.