Alert archive / Missouri / Tornado Warnings in 2011
Tornado Warning 31, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 19, 2011, 7:37 PM CDT for Jefferson County, Saint Louis County, Missouri; Monroe County, Illinois. It was in force for 36 min. 7 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
- Apr 19, 2011, 7:37 PM CDT (00:37 UTC)
- Expired
- Apr 19, 2011, 8:13 PM CDT
- In force
- 36 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Monroe County, IL, Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 41 km from the middle of the area, began a volume at 00:40 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 |
|---|---|---|---|
| Apr 19, 7:39 PM CDT | HAIL 0.7 | High Ridge, MO | |
| Apr 19, 7:43 PM CDT | HAIL 0.75 | Fenton, MO | |
| Apr 19, 7:43 PM CDT | HAIL 1 | Sunset Hills, MO | |
| Apr 19, 7:50 PM CDT | TSTM WND DMG | 1 Ese Fenton, MO | MOBILE HOME SIDING TORN OFF |
| Apr 19, 7:50 PM CDT | HAIL 1 | Sunset Hills, MO | |
| Apr 19, 7:50 PM CDT | HAIL 1.25 | 1 Ese Fenton, MO | MOBILE HOME SIDING TORN OFF |
| Apr 19, 7:54 PM CDT | HAIL 1 | Affton, MO | I-270 AND TESSON FERRY |
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 |
|---|---|---|---|
| Apr 19, 1:00 PM CDT | Tornado Watch | SPC | 10 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.6 hours before the alert went out and 247 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.
- Mixed-layer CAPE
- 2409 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 370 m²/s²
- 0-3 km storm-relative helicity
- 547 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 24.4
The text
As transmitted, in the capitals the NWS used until 2016.
638 WFUS53 KLSX 200037 TORLSX ILC133-MOC099-189-200130- /O.NEW.KLSX.TO.W.0031.110420T0037Z-110420T0130Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 737 PM CDT TUE APR 19 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... NORTHWESTERN MONROE COUNTY IN SOUTHWEST ILLINOIS... NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... SOUTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 830 PM CDT * AT 736 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR HOUSE SPRINGS...OR NEAR BYRNES MILL...AND MOVING EAST AT 50 MPH. * LOCATIONS IMPACTED INCLUDE... MURPHY...BARNHART...VALLEY PARK...FENTON...ARNOLD...SUNSET HILLS... CRESTWOOD...OAKLAND...OAKVILLE...LAKESHIRE...MEHLVILLE...WEBSTER GROVES...AFFTON...SHREWSBURY...LEMAY...COLUMBIA...FOUNTAIN... PEERLESS PARK...KIMMSWICK AND NEW HANDOVER. 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 3836 9010 3824 9067 3849 9074 3860 9033 TIME...MOT...LOC 0038Z 249DEG 44KT 3843 9051 $$ GLASS
4 follow-up statements
784 WWUS53 KLSX 200045 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 745 PM CDT TUE APR 19 2011 ILC133-MOC099-189-200130- /O.CON.KLSX.TO.W.0031.000000T0000Z-110420T0130Z/ MONROE IL-JEFFERSON MO-ST. LOUIS MO- 745 PM CDT TUE APR 19 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN ST. LOUIS... NORTHERN JEFFERSON AND NORTHWESTERN MONROE COUNTIES UNTIL 830 PM CDT... AT 740 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR HIGH RIDGE...MOVING EAST AT 50 MPH. LARGE HAIL TO THE SIZE OF QUARTERS WILL ALSO OCCUR WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... ARNOLD...CRESTWOOD...OAKLAND...OAKVILLE...WEBSTER GROVES... LAKESHIRE...MEHLVILLE...AFFTON...SHREWSBURY...LEMAY...COLUMBIA... FOUNTAIN AND NEW HANDOVER. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 3836 9010 3824 9067 3849 9074 3860 9033 TIME...MOT...LOC 0045Z 254DEG 45KT 3844 9040 $$ GLASS
748 WWUS53 KLSX 200049 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 749 PM CDT TUE APR 19 2011 ILC133-MOC099-189-200130- /O.CON.KLSX.TO.W.0031.000000T0000Z-110420T0130Z/ MONROE IL-JEFFERSON MO-ST. LOUIS MO- 749 PM CDT TUE APR 19 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN ST. LOUIS... NORTHERN JEFFERSON AND NORTHWESTERN MONROE COUNTIES UNTIL 830 PM CDT... AT 744 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO. THIS TORNADO WAS LOCATED NEAR ARNOLD...MOVING EAST AT 50 MPH. LOCATIONS IMPACTED INCLUDE... SHREWSBURY...LEMAY...COLUMBIA AND NEW HANDOVER. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPEAT...A TORNADO IS ON THE GROUND. 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 3836 9010 3824 9067 3849 9074 3860 9033 TIME...MOT...LOC 0049Z 254DEG 45KT 3848 9031 $$ GLASS
586
WWUS53 KLSX 200057
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
757 PM CDT TUE APR 19 2011
ILC133-MOC099-189-200130-
/O.CON.KLSX.TO.W.0031.000000T0000Z-110420T0130Z/
MONROE IL-JEFFERSON MO-ST. LOUIS MO-
757 PM CDT TUE APR 19 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN ST. LOUIS...
NORTHEASTERN JEFFERSON AND NORTHWESTERN MONROE COUNTIES UNTIL 830 PM
CDT...
AT 753 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR DUPO...MOVING EAST AT 50 MPH.
LOCATIONS IMPACTED INCLUDE...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 3829 9040 3856 9039 3860 9033 3858 9031
3857 9031 3857 9030 3853 9026 3852 9026
3850 9023 3836 9010
TIME...MOT...LOC 0057Z 254DEG 45KT 3851 9019
$$
GLASS117
WWUS53 KLSX 200113
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
813 PM CDT TUE APR 19 2011
ILC133-MOC099-189-200123-
/O.CAN.KLSX.TO.W.0031.000000T0000Z-110420T0130Z/
MONROE IL-JEFFERSON MO-ST. LOUIS MO-
813 PM CDT TUE APR 19 2011
...THE TORNADO WARNING FOR SOUTHEASTERN ST. LOUIS...NORTHEASTERN
JEFFERSON AND NORTHWESTERN MONROE COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 900 PM.
LAT...LON 3829 9040 3856 9039 3860 9033 3858 9031
3857 9031 3857 9030 3853 9026 3852 9026
3850 9023 3836 9010
TIME...MOT...LOC 0113Z 254DEG 45KT 3856 8994
$$
GLASSThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 7:03 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Washington | 42 min |
| Apr 19, 7:05 PM CDT | Areal Flood Advisory | LSX | Saint Louis, City of Saint Louis | 5 hr |
| Apr 19, 7:17 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison | 28 min |
| Apr 19, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Louis | 42 min |
| Apr 19, 7:25 PM CDT | Tornado Warning | LSX | Iron, Madison, Saint Francois | 40 min |
| Apr 19, 7:29 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 46 min |
| Apr 19, 7:30 PM CDT | Tornado Warning | LSX | Saint Louis, City of Saint Louis | 45 min |
| Apr 19, 7:34 PM CDT | Tornado Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 41 min |
| Apr 19, 7:39 PM CDT | Tornado Warning | LSX | Franklin, Jefferson, Washington | 33 min |
| Apr 19, 7:48 PM CDT | Tornado Warning | LSX | Madison | 27 min |
| Apr 19, 7:54 PM CDT | Tornado Warning | LSX | Sainte Genevieve | 36 min |
| Apr 19, 9:37 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 21 min |
| Apr 19, 7:35 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Montgomery | 40 min |
| Apr 19, 7:51 PM CDT | Tornado Warning | LSX | Saint Clair | 39 min |
| Apr 19, 7:56 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Montgomery | 34 min |
| Apr 19, 8:00 PM CDT | Tornado Warning | LSX | Bond, Clinton, Madison | 45 min |
| Apr 19, 8:02 PM CDT | Areal Flood Advisory | LSX | Bond, Macoupin, Montgomery | 4 hr |
| Apr 19, 8:18 PM CDT | Tornado Warning | LSX | Randolph, Saint Clair, Washington | 42 min |
| Apr 19, 8:25 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Madison, Saint Clair | 22 min |
| Apr 19, 8:33 PM CDT | Tornado Warning | LSX | Fayette | 42 min |
| Apr 19, 8:33 PM CDT | Tornado Warning | LSX | Bond, Clinton, Fayette, Marion, Washington | 57 min |
| Apr 19, 9:41 PM CDT | River Flood Warning | LSX | Fayette | 13 days |
Nearby
Tornado Warnings in Missouri, 2011Tornado Warnings in Illinois, 2011Every tornado warning in 2011Tornadoes in 2011
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.