Alert archive / Missouri / Tornado Warnings in 2013

Tornado Warning 20, NWS St. Louis, MO

May 20, 2013Marion County, Ralls County, Missouri

NWS St. Louis, MO issued this tornado warning at May 20, 2013, 7:02 PM CDT for Marion County, Ralls County, Missouri. It was in force for 43 min. 9 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
May 20, 2013, 7:02 PM CDT (00:02 UTC)
Expired
May 20, 2013, 7:45 PM CDT
In force
43 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.75 in

Counties Marion County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 129 km from the middle of the area, began a volume at 00:02 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
May 20, 7:04 PM CDTFUNNEL CLOUD3 W Center, MOFUNNEL CLOUD SIGHTED 1 MILE SOUTH OF LANDING
May 20, 7:16 PM CDTTSTM WND GST 45Center, MO
May 20, 7:25 PM CDTTSTM WND GST 88Hannibal, MOTREES UPROOTED ONE QUARTER MILE SOUTHEAST OF AIRPORT
May 20, 7:29 PM CDTTSTM WND DMGHannibal, MOLARGE LIMBS BLOWN DOWN
May 20, 7:29 PM CDTTORNADOHannibal, MO
May 20, 7:30 PM CDTTSTM WND DMG1 W Hannibal, MONUMEROUS TREES UPROOTED
May 20, 7:32 PM CDTTORNADOHannibal, MOOFFICIAL FROM HANNIBAL LAGRANGE UNIVERSITY REPORTED ROOF REMOVED FROM THE SCIENCE BUILDING.
May 20, 7:35 PM CDTTSTM WND GST 58Hannibal, MO
May 20, 7:36 PM CDTTORNADOHannibal, MOTHERE ARE SEVERAL LARGE TREES SNAPPED. - SEVERE DANAGE TO TWO MACHINE SHEDS NEAR HIGHWAY MM. SHINGLES REMOVED AT SOME BUILDINGS IN DOWNTOWN AREA.

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
May 20, 5:24 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.0 hours before the alert went out and 229 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, Davenport, at 00:00Z on 2013-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 195 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, Davenport, at 00:00Z on 2013-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 square meters per square second.1939587897Sfc1 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
195 J/kg
Mixed-layer CIN
-189 J/kg
Mixed-layer LCL
1801 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

930 
WFUS53 KLSX 210002
TORLSX
MOC127-173-210045-
/O.NEW.KLSX.TO.W.0020.130521T0002Z-130521T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
702 PM CDT MON MAY 20 2013

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN MARION COUNTY IN NORTHEAST MISSOURI...
  RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 745 PM CDT

* AT 658 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 8 MILES NORTHWEST OF PERRY...AND MOVING
  NORTHEAST AT 50 MPH.

  HAZARD...DEVELOPING TORNADO AND GOLF BALL SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
           SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
           OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
           EXTENSIVE TREE DAMAGE IS LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  HANNIBAL...CENTER...SPAULDING...RENSSELAER...NEW LONDON...THE
  LANDING...ILASCO AND SAVERTON.

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 3985 9144 3980 9137 3973 9137 3972 9136
      3960 9120 3933 9171 3966 9172
TIME...MOT...LOC 0002Z 226DEG 42KT 3955 9170

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

BRITT
3 follow-up statements
567 
WWUS53 KLSX 210006
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
706 PM CDT MON MAY 20 2013

MOC127-173-210045-
/O.CON.KLSX.TO.W.0020.000000T0000Z-130521T0045Z/
MARION MO-RALLS MO-
706 PM CDT MON MAY 20 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR RALLS AND SOUTHEASTERN
MARION COUNTIES UNTIL 745 PM CDT...

AT 702 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 7 MILES WEST OF CENTER...AND MOVING NORTHEAST AT 55 MPH.

HAZARD...DEVELOPING TORNADO AND GOLF BALL SIZE HAIL.

SOURCE...WEATHER SPOTTERS REPORTED FUNNEL CLOUD.

IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
         SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
         OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
         EXTENSIVE TREE DAMAGE IS LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...
  NEW LONDON AROUND 715 PM CDT.
  HANNIBAL AROUND 720 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE ILASCO AND SAVERTON.

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 3985 9144 3980 9137 3973 9137 3972 9136
      3960 9120 3933 9171 3966 9172
TIME...MOT...LOC 0006Z 239DEG 48KT 3957 9160

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

BRITT
098 
WWUS53 KLSX 210021
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
721 PM CDT MON MAY 20 2013

MOC127-173-210045-
/O.CON.KLSX.TO.W.0020.000000T0000Z-130521T0045Z/
MARION MO-RALLS MO-
721 PM CDT MON MAY 20 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR RALLS AND SOUTHEASTERN
MARION COUNTIES UNTIL 745 PM CDT...

AT 716 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR SPAULDING...AND MOVING NORTHEAST AT 55 MPH.

HAZARD...DEVELOPING TORNADO AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
         SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
         OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
         EXTENSIVE TREE DAMAGE IS LIKELY.

LOCATIONS IMPACTED INCLUDE...
HANNIBAL...ILASCO AND SAVERTON.

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 3985 9144 3980 9137 3973 9137 3972 9136
      3960 9120 3933 9171 3966 9172
TIME...MOT...LOC 0020Z 236DEG 47KT 3968 9141

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

$$

BRITT
324 
WWUS53 KLSX 210039
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
739 PM CDT MON MAY 20 2013

MOC127-173-210049-
/O.EXP.KLSX.TO.W.0020.000000T0000Z-130521T0045Z/
MARION MO-RALLS MO-
739 PM CDT MON MAY 20 2013

...THE TORNADO WARNING FOR RALLS AND SOUTHEASTERN MARION COUNTIES
WILL EXPIRE AT 745 PM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 100 AM CDT.

LAT...LON 3985 9144 3980 9137 3973 9137 3972 9136
      3960 9120 3933 9171 3966 9172
TIME...MOT...LOC 0039Z 236DEG 47KT 3982 9114

$$

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 7:29 PM CDTSevere Thunderstorm WarningLSXFranklin, Saint Charles, Saint Louis46 min
May 20, 7:30 PM CDTTornado Warning Tornado observedLSXMarion, Ralls30 min
May 20, 7:48 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau42 min
May 20, 8:10 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis50 min
May 20, 8:25 PM CDTSevere Thunderstorm WarningLSXCallaway, Osage35 min
May 20, 8:41 PM CDTAreal Flood AdvisoryLSXSaint Charles, Saint Louis6 hr
May 20, 8:51 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Montgomery, Warren39 min
May 20, 9:21 PM CDTFlash Flood WarningLSXFranklin, Saint Charles, Saint Louis, Warren6 hr
May 20, 9:36 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Charles, Saint Louis39 min
May 20, 9:39 PM CDTFlash Flood WarningLSXLincoln, Saint Charles6 hr
May 20, 10:10 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis, City of Saint Louis35 min
May 20, 10:38 PM CDTSevere Thunderstorm WarningLSXIron, Jefferson, Sainte Genevieve, Saint Francois, Washington67 min
May 20, 11:13 PM CDTSevere Thunderstorm WarningLSXIron, Madison, Reynolds62 min
May 20, 11:20 PM CDTRiver Flood WarningLSXSaint Charles47 hr
May 20, 11:29 PM CDTRiver Flood WarningLSXSaint Charles3 days
May 21, 12:33 AM CDTRiver Flood WarningLSXLincoln4 days
May 21, 6:35 AM CDTRiver Flood WarningLSXLincoln44 hr
May 21, 9:49 AM CDTRiver Flood WarningLSXJefferson, Saint Louis6 days

Nearby

Tornado Warnings in Missouri, 2013Every tornado warning in 2013Tornadoes in 2013

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.