Alert archive / Missouri / Tornado Warnings in 2014

Tornado Warning 29, NWS St. Louis, MO

September 1, 2014Jefferson County, Saint Louis County, Missouri

NWS St. Louis, MO issued this tornado warning at Sep 1, 2014, 10:43 PM CDT for Jefferson County, Saint Louis County, Missouri. It was in force for 32 min. 8 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 1, 2014, 10:43 PM CDT (03:43 UTC)
Expired
Sep 1, 2014, 11:15 PM CDT
In force
32 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Jefferson County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 31 km from the middle of the area, began a volume at 03:46 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 1, 10:50 PM CDTFUNNEL CLOUDByrnes Mill, MOALONG GRAVOIS ROAD
Sep 1, 10:50 PM CDTTSTM WND DMGHouse Springs, MOSIGNIFICANT BUILDING DAMAGE WITH DEBRIS BLOWN ONE EIGHTH OF A MILE AWAY
Sep 1, 10:50 PM CDTHAIL 1.752 S Ballwin, MONEW BALLWIN ROAD AND BIG BEND ROAD.
Sep 1, 10:50 PM CDTTORNADO1 Wnw House Springs, MOSIGNIFICANT BUILDING DAMAGE WITH DEBRIS BLOWN ONE EIGHTH OF A MILE AWAY AT INTERSECTION OF HIGHWAYS 30 AND W...EF-1 DAMAGE CONFIRMED BY NWS SURVEY TEAM...TIME APPROXIMATE AND WILL BE UPDATED
Sep 1, 10:54 PM CDTHAIL 12 Ssw Manchester, MOBIG BEND AT SULPHUR SPRINGS ROAD.
Sep 1, 11:00 PM CDTTSTM WND GST 70Valley Park, MOTIME ESTIMATED BY RADAR
Sep 1, 11:00 PM CDTHAIL 0.882 S Fenton, MOAT HIGHWAY 141 AND HIGHWAY 30.
Sep 1, 11:00 PM CDTHAIL 1.25Valley Park, MOHIGHWAY 141 AND VANCE. TIME ESTIMATED BY RADAR. RELAYED BY FOX 2.

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 1, 5:57 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.7 hours before the alert went out and 252 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 2014-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 56 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 2014-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
56 J/kg
Mixed-layer CIN
-180 J/kg
Mixed-layer LCL
1331 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

279 
WFUS53 KLSX 020343
TORLSX
MOC099-189-020415-
/O.NEW.KLSX.TO.W.0029.140902T0343Z-140902T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1043 PM CDT MON SEP 1 2014

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHWESTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 1115 PM CDT

* AT 1041 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR BYRNES MILL...AND MOVING EAST AT 40 MPH.

  HAZARD...TORNADO.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
           TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
           LIKELY.

* THIS DANGEROUS STORM WILL BE NEAR...
  HIGH RIDGE AROUND 1050 PM CDT.
  MURPHY AND VALLEY PARK AROUND 1055 PM CDT.
  ARNOLD AND SUNSET HILLS AROUND 1100 PM CDT.
  OAKVILLE AND CRESTWOOD AROUND 1105 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE OTTO...PARKDALE AND PEERLESS
PARK.

THIS WARNING INCLUDES CASTLEWOOD STATE PARK AND ROUTE 66 STATE PARK.

THIS WARNING ALSO INCLUDES...
INTERSTATE 44 FROM EXIT 261 TO EXIT 277.
INTERSTATE 55 IN MISSOURI FROM EXIT 190 TO EXIT 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3840 9032 3832 9070 3844 9074 3845 9073
      3850 9073 3864 9039 3841 9031
TIME...MOT...LOC 0344Z 256DEG 35KT 3843 9060

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

TRUETT
2 follow-up statements
357 
WWUS53 KLSX 020353
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1053 PM CDT MON SEP 1 2014

MOC099-189-020415-
/O.CON.KLSX.TO.W.0029.000000T0000Z-140902T0415Z/
JEFFERSON MO-ST. LOUIS MO-
1053 PM CDT MON SEP 1 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL ST. LOUIS
AND NORTHEASTERN JEFFERSON COUNTIES UNTIL 1115 PM CDT...

AT 1050 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR BYRNES MILL...AND MOVING EAST AT 40 MPH.

HAZARD...TORNADO AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
         LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...
  FENTON AROUND 1100 PM CDT.
  ARNOLD AND SUNSET HILLS AROUND 1105 PM CDT.
  CRESTWOOD AROUND 1110 PM CDT.

THIS WARNING INCLUDES CASTLEWOOD STATE PARK AND ROUTE 66 STATE PARK.

THIS WARNING ALSO INCLUDES...
INTERSTATE 44 FROM EXIT 264 TO EXIT 277.
INTERSTATE 55 IN MISSOURI FROM EXIT 190 TO EXIT 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3840 9032 3835 9060 3852 9068 3864 9039
      3841 9031
TIME...MOT...LOC 0353Z 255DEG 33KT 3844 9052

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

TRUETT
832 
WWUS53 KLSX 020401
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1101 PM CDT MON SEP 1 2014

MOC099-189-020415-
/O.CON.KLSX.TO.W.0029.000000T0000Z-140902T0415Z/
JEFFERSON MO-ST. LOUIS MO-
1101 PM CDT MON SEP 1 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL ST. LOUIS
AND NORTHEASTERN JEFFERSON COUNTIES UNTIL 1115 PM CDT...

AT 1058 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR MURPHY...AND MOVING EAST AT 40 MPH.

HAZARD...TORNADO AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
         LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...
  CRESTWOOD AROUND 1110 PM CDT.

THIS WARNING INCLUDES CASTLEWOOD STATE PARK AND ROUTE 66 STATE PARK.

THIS WARNING ALSO INCLUDES...
INTERSTATE 44 FROM EXIT 264 TO EXIT 277.
INTERSTATE 55 IN MISSOURI FROM EXIT 190 TO EXIT 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3840 9032 3835 9060 3852 9068 3864 9039
      3841 9031
TIME...MOT...LOC 0402Z 255DEG 33KT 3846 9042

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 7:58 PM CDTAreal Flood AdvisoryLSXBoone, Callaway, Montgomery3 hr
Sep 1, 8:44 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Saint Louis46 min
Sep 1, 8:53 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Warren52 min
Sep 1, 9:07 PM CDTFlash Flood WarningLSXBoone, Callaway, Moniteau4 hr
Sep 1, 9:26 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis49 min
Sep 1, 10:33 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis42 min
Sep 1, 10:52 PM CDTAreal Flood AdvisoryLSXFranklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis4 hr
Sep 1, 11:07 PM CDTTornado WarningLSXJefferson, Saint Louis23 min
Sep 1, 11:14 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis25 min
Sep 2, 12:08 AM CDTFlash Flood WarningLSXBoone, Callaway, Moniteau, Montgomery8 hr
Sep 2, 1:23 AM CDTRiver Flood WarningLSXSaint Charles7 days
Sep 2, 7:23 AM CDTRiver Flood WarningLSXLincoln38 hr
Sep 2, 7:43 AM CDTAreal Flood WarningLSXBoone, Callaway, Lincoln, Montgomery, Saint Charles, Warren8 hr

Nearby

Tornado Warnings in Missouri, 2014Every tornado warning in 2014Tornadoes in 2014

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.