Alert archive / Missouri / Tornado Warnings in 2013

Tornado Warning 29, NWS St. Louis, MO

May 31, 2013Jefferson County, Saint Louis County, Missouri; Monroe County, Saint Clair County, Illinois

NWS St. Louis, MO issued this tornado warning at May 31, 2013, 8:26 PM CDT for Jefferson County, Saint Louis County, Missouri; Monroe County, Saint Clair County, Illinois. It was in force for 34 min. 2 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 31, 2013, 8:26 PM CDT (01:26 UTC)
Expired: May 31, 2013, 9:00 PM CDT
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Monroe County, IL, Saint Clair County, IL, Jefferson County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 01:27 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
May 31, 8:30 PM CDT	TSTM WND GST 50	Arnold, MO	NEAR THE INTERSECTION OF HIGHWAYS 141 AND I-55... RELAYED FROM AMATEUR RADIO.
May 31, 8:40 PM CDT	HAIL 0.7	Mehlville, MO	DIME SIZE HAIL NEAR THE LEMAY FERRY AND REAVIS BARRACKS INTERSECTION.

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
May 31, 5:45 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.4 hours before the alert went out and 235 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: 2269 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 3.6
Supercell composite: 15.2

Open this sounding in Storm Lab

The text

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

419 
WFUS53 KLSX 010126
TORLSX
ILC133-163-MOC099-189-010200-
/O.NEW.KLSX.TO.W.0029.130601T0126Z-130601T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
826 PM CDT FRI MAY 31 2013

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  WEST CENTRAL ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  SOUTH CENTRAL ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 900 PM CDT

* AT 823 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR ARNOLD...AND MOVING EAST AT 40 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...
  ARNOLD...OAKVILLE...MEHLVILLE...COLUMBIA...DUPO...WATERLOO...
  MILLSTADT...FOUNTAIN...KIMMSWICK...NEW HANDOVER...BARR AND
  FLORAVILLE.

THIS WARNING INCLUDES MASTODON HISTORIC SITE.

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 3853 9006 3831 9003 3834 9047 3850 9046
TIME...MOT...LOC 0126Z 267DEG 33KT 3842 9040

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

$$

GLASS

2 follow-up statements

063 
WWUS53 KLSX 010140 RRA
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
840 PM CDT FRI MAY 31 2013

MOC099-010151-
/O.CAN.KLSX.TO.W.0029.000000T0000Z-130601T0200Z/
JEFFERSON MO-
840 PM CDT FRI MAY 31 2013

...THE TORNADO WARNING FOR NORTHEASTERN JEFFERSON COUNTY IS
CANCELLED...

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

LAT...LON 3833 9037 3835 9037 3838 9034 3843 9035
      3846 9034 3846 9035 3851 9033 3853 9006
      3831 9003
TIME...MOT...LOC 0141Z 267DEG 33KT 3843 9022

$$

ILC133-163-MOC189-010200-
/O.CON.KLSX.TO.W.0029.000000T0000Z-130601T0200Z/
MONROE IL-ST. CLAIR IL-ST. LOUIS MO-
840 PM CDT FRI MAY 31 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN ST. LOUIS...
WEST CENTRAL ST. CLAIR AND NORTHERN MONROE COUNTIES UNTIL 900 PM
CDT...

AT 836 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR OAKVILLE...AND MOVING EAST AT 40 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...
WATERLOO...MILLSTADT...BARR...FLORAVILLE AND PADERBORN.

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 3833 9037 3835 9037 3838 9034 3843 9035
      3846 9034 3846 9035 3851 9033 3853 9006
      3831 9003
TIME...MOT...LOC 0141Z 267DEG 33KT 3843 9022

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

$$

GLASS

157 
WWUS53 KLSX 010157
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
857 PM CDT FRI MAY 31 2013

ILC133-163-MOC189-010207-
/O.EXP.KLSX.TO.W.0029.000000T0000Z-130601T0200Z/
MONROE IL-ST. CLAIR IL-ST. LOUIS MO-
857 PM CDT FRI MAY 31 2013

...THE TORNADO WARNING FOR SOUTHEASTERN ST. LOUIS...WEST CENTRAL ST.
CLAIR AND NORTHERN MONROE COUNTIES WILL EXPIRE AT 900 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1000 PM.

LAT...LON 3833 9037 3835 9037 3838 9034 3843 9035
      3846 9034 3846 9035 3851 9033 3853 9006
      3831 9003
TIME...MOT...LOC 0157Z 267DEG 33KT 3844 9003

$$

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 7:16 PM CDT	Tornado Warning	LSX	Lincoln	29 min
May 31, 7:26 PM CDT	Tornado Warning	LSX	Franklin	34 min
May 31, 7:30 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren	45 min
May 31, 7:48 PM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis	27 min
May 31, 7:59 PM CDT	Tornado Warning	LSX	Franklin, Jefferson, Saint Louis	31 min
May 31, 8:08 PM CDT	Tornado Warning Tornado observed	LSX	Saint Charles, Saint Louis, City of Saint Louis	37 min
May 31, 8:12 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Charles, Saint Louis, City of Saint Louis	48 min
May 31, 8:43 PM CDT	Flash Flood Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren, City of Saint Louis	6 hr
May 31, 10:43 PM CDT	River Flood Warning	LSX	Saint Charles	38 hr
May 31, 10:55 PM CDT	River Flood Warning	LSX	Franklin	4 days
May 31, 11:02 PM CDT	Flash Flood Warning	LSX	Crawford, Jefferson, Washington	6 hr
May 31, 11:25 PM CDT	Areal Flood Warning	LSX	Boone, Cole, Moniteau	5 hr
May 31, 11:54 PM CDT	Areal Flood Warning	LSX	Callaway	9 hr
Jun 1, 12:58 AM CDT	Areal Flood Warning	LSX	Cole, Gasconade, Moniteau, Osage	8 hr
Jun 1, 2:29 AM CDT	Areal Flood Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren, City of Saint Louis	7 hr
Jun 1, 3:55 AM CDT	Areal Flood Warning	LSX	Boone, Cole, Moniteau	12 hr
Jun 1, 4:14 AM CDT	Flash Flood Warning	LSX	Iron, Madison, Reynolds	6 hr
Jun 1, 4:35 AM CDT	River Flood Warning	LSX	Crawford, Washington	32 hr
Jun 1, 4:35 AM CDT	River Flood Warning	LSX	Franklin, Jefferson	4 days
Jun 1, 4:35 AM CDT	River Flood Warning	LSX	Jefferson, Saint Louis	4 days
Jun 1, 5:03 AM CDT	Areal Flood Warning	LSX	Crawford, Iron, Jefferson, Saint Louis, Washington, City of Saint Louis	6 hr
Jun 1, 8:57 AM CDT	Areal Flood Warning	LSX	Cole, Gasconade, Moniteau, Osage	7 hr
Jun 1, 9:31 AM CDT	Areal Flood Warning	LSX	Franklin	8 hr
Jun 1, 9:50 AM CDT	Areal Flood Warning	LSX	Iron, Madison, Reynolds	12 hr
Jun 1, 3:55 PM CDT	Areal Flood Warning	LSX	Cole, Gasconade, Osage	6 hr
Jun 1, 5:28 PM CDT	Areal Flood Warning	LSX	Franklin	18 hr
May 31, 8:31 PM CDT	Tornado Warning	LSX	Greene, Jersey, Macoupin	29 min
May 31, 8:33 PM CDT	Tornado Warning	LSX	Bond, Madison	27 min
May 31, 8:50 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Montgomery and 2 more	55 min
May 31, 8:50 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	25 min
May 31, 8:52 PM CDT	Tornado Warning	LSX	Bond, Madison, Montgomery	23 min
May 31, 8:56 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	34 min
May 31, 9:07 PM CDT	Tornado Warning	LSX	Macoupin	23 min
May 31, 9:13 PM CDT	Tornado Warning	LSX	Bond, Fayette, Marion, Montgomery	32 min
May 31, 9:21 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	54 min
May 31, 9:43 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	47 min
May 31, 10:28 PM CDT	Flash Flood Warning	LSX	Calhoun, Greene, Jersey, Macoupin	6 hr
Jun 1, 12:09 AM CDT	Flash Flood Warning	LSX	Marion, Washington	6 hr
Jun 1, 5:57 AM CDT	Areal Flood Warning	LSX	Marion, Washington	6 hr
Jun 1, 11:51 AM CDT	Areal Flood Warning	LSX	Marion, Washington	6 hr
Jun 1, 5:56 PM CDT	Areal Flood Warning	LSX	Marion	18 hr

Nearby

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