Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 200, NWS St. Louis, MO

July 7, 2012Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 7, 2012, 7:03 PM CDT for Saint Louis County, Missouri. It was in force for 42 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
Jul 7, 2012, 7:03 PM CDT (00:03 UTC)
Expired
Jul 7, 2012, 7:45 PM CDT
In force
42 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Saint Louis County, MO

The radar

The St Louis radar (KLSX), 18 km from the middle of the area, began a volume at 00:04 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
Jul 7, 7:04 PM CDTTSTM WND DMGKirkwood, MOTREE AND POWER LINE DAMAGE IN KIRKWOOD.
Jul 7, 7:17 PM CDTTSTM WND DMG1 Ne Ellisville, MOSEVERAL TREES BLOWN DOWN ON VESPER DRIVE.
Jul 7, 7:38 PM CDTTSTM WND DMG1 Sse Manchester, MOTREES BLOWN DOWN ON BROOKVALE TERRACE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.1 hours before the alert went out and 239 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 00:00Z on 2012-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 199 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 00:00Z on 2012-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.193958Sfc1 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
199 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
2803 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

428 
WUUS53 KLSX 080003
SVRLSX
MOC189-080045-
/O.NEW.KLSX.SV.W.0200.120708T0003Z-120708T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
703 PM CDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 745 PM CDT

* AT 659 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DES PERES...
  AND MOVING WEST AT 15 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...
  TOWN AND COUNTRY...VALLEY PARK...MANCHESTER...BALLWIN...
  CHESTERFIELD...CLARKSON VALLEY...ELLISVILLE AND PEERLESS PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3852 9061 3868 9064 3871 9037 3855 9036
TIME...MOT...LOC 0002Z 078DEG 12KT 3861 9046

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

$$

KANOFSKY
3 follow-up statements
975 
WWUS53 KLSX 080025
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
725 PM CDT SAT JUL 7 2012

MOC189-080045-
/O.CON.KLSX.SV.W.0200.000000T0000Z-120708T0045Z/
ST. LOUIS MO-
725 PM CDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL ST.
LOUIS COUNTY UNTIL 745 PM CDT...

AT 721 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BALLWIN...AND
MOVING WEST AT 15 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...
CHESTERFIELD...CLARKSON VALLEY AND ELLISVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3852 9061 3868 9064 3868 9061 3868 9055
      3870 9053 3870 9045 3870 9042 3854 9040
TIME...MOT...LOC 0025Z 078DEG 12KT 3859 9056

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

$$

KANOFSKY
393 
WWUS53 KLSX 080030
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
730 PM CDT SAT JUL 7 2012

MOC189-080045-
/O.CON.KLSX.SV.W.0200.000000T0000Z-120708T0045Z/
ST. LOUIS MO-
730 PM CDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL ST.
LOUIS COUNTY UNTIL 745 PM CDT...

AT 725 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BALLWIN...AND
MOVING WEST AT 15 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS REPORTED TREES DOWN IN ELLISVILLE.

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

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF WESTERN ST. LOUIS COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3852 9061 3868 9064 3868 9061 3868 9055
      3870 9053 3870 9045 3870 9042 3854 9040
TIME...MOT...LOC 0030Z 078DEG 12KT 3859 9058

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

$$

KANOFSKY
949 
WWUS53 KLSX 080044
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
744 PM CDT SAT JUL 7 2012

MOC189-080054-
/O.EXP.KLSX.SV.W.0200.000000T0000Z-120708T0045Z/
ST. LOUIS MO-
744 PM CDT SAT JUL 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ST. LOUIS COUNTY WILL
EXPIRE AT 745 PM CDT...

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

LAT...LON 3852 9061 3868 9064 3868 9061 3868 9055
      3870 9053 3870 9045 3870 9042 3854 9040
TIME...MOT...LOC 0044Z 078DEG 12KT 3858 9064

$$

KANOFSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 7:06 PM CDTSevere Thunderstorm WarningLSXJefferson32 min
Jul 7, 7:10 PM CDTSevere Thunderstorm WarningLSXIron, Saint Francois, Washington39 min
Jul 7, 7:18 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis27 min
Jul 7, 7:58 PM CDTSevere Thunderstorm WarningLSXJefferson47 min
Jul 7, 8:49 PM CDTSevere Thunderstorm WarningLSXWashington26 min
Jul 8, 1:36 PM CDTSevere Thunderstorm WarningLSXOsage39 min
Jul 8, 2:10 PM CDTSevere Thunderstorm WarningLSXOsage28 min
Jul 8, 3:41 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Washington49 min
Jul 8, 3:53 PM CDTSevere Thunderstorm WarningLSXFranklin37 min
Jul 8, 4:24 PM CDTSevere Thunderstorm WarningLSXFranklin19 min
Jul 8, 5:57 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis27 min
Jul 8, 6:49 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis41 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.