Alert archive / Missouri / Tornado Warnings in 2011
Tornado Warning 46, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 22, 2011, 7:36 PM CDT for Saint Charles County, Saint Louis County, Missouri. It was in force for 39 min. 18 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 22, 2011, 7:36 PM CDT (00:36 UTC)
- Expired
- Apr 22, 2011, 8:15 PM CDT
- In force
- 39 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
The radar
The St Louis radar (KLSX), 14 km from the middle of the area, began a volume at 00:38 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 22, 7:40 PM CDT | HAIL 1.5 | 2 Ssw O'Fallon, MO | |
| Apr 22, 7:41 PM CDT | HAIL 1.75 | St. Peters, MO | GOLF BALL SIZE HAIL AT HIGHWAY K AND MEXICO ROAD |
| Apr 22, 7:42 PM CDT | HAIL 1 | St. Peters, MO | QUARTER SIZE HAIL AND STREET FLOODING |
| Apr 22, 7:43 PM CDT | HAIL 1.5 | St. Peters, MO | NEAR SALT LICK AND I70 |
| Apr 22, 7:44 PM CDT | HAIL 2 | O'Fallon, MO | APPROXIMATELY 1 MILE WEST OF K AND N |
| Apr 22, 7:45 PM CDT | TSTM WND DMG | O'Fallon, MO | 12 INCH DIAMETER TREE FELL ONTO A CAR ON VETERANS MEMORIAL PARKWAY BETWEEN HIGHWAY K AND BRYAN ROAD |
| Apr 22, 7:46 PM CDT | HAIL 1.5 | O'Fallon, MO | AT EXIT 217 ON I70 |
| Apr 22, 7:48 PM CDT | TSTM WND GST 70 | St. Peters, MO | |
| Apr 22, 7:53 PM CDT | HAIL 0.5 | Harvester, MO | |
| Apr 22, 7:54 PM CDT | TSTM WND GST 80 | St. Peters, MO | I-70 AND CAVE SPRINGS |
| Apr 22, 7:55 PM CDT | FUNNEL CLOUD | St. Peters, MO | |
| Apr 22, 7:58 PM CDT | TSTM WND GST 55 | St. Charles, MO | HIGHWAY 70 AND 5TH STREET |
| Apr 22, 7:59 PM CDT | TSTM WND DMG | 1 Sse Maryland Heights, MO | TREES AND POWER LINES DOWN AT 2 MIILES WEST OF HIGHWAY 270 AND DORSETT ROAD |
| Apr 22, 8:04 PM CDT | TSTM WND DMG | St. Charles, MO | TREES AND POWER LINES DOWN AT 2 MIILES WEST OF HIGHWAY 270 AND DORSETT ROAD |
| Apr 22, 8:09 PM CDT | TSTM WND DMG | Maryland Heights, MO | POWER LINES AND TREES DOWN AT CREVE COEUR MILL AND PRITCHARD FARM ROADS |
| Apr 22, 8:10 PM CDT | TORNADO | Bridgeton, MO | SEMI BLOWN OVER AT HIGHWAY 70 AND ST CHARLES ROCK ROAD |
| Apr 22, 8:14 PM CDT | TORNADO | Bridgeton, MO | OBSERVER AT STL REPORTS TORNADO AT LAMBERT FIELD MOVING EAST |
| Apr 22, 8:21 PM CDT | TORNADO | Hazelwood, MO | CHASERS REPORT DAMAGE AND DEBRIS NEAR EXIT 236 ON I70...TREES DAMAGED...CELL PHONE TOWER BENT OVER...FLAG POLE AT AIRPORT BENT OVER...INTERSTATE SIGNS DOWN AND SMALL DEBRIS ON THE INTERSTATE |
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 22, 3:34 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.6 hours before the alert went out and 228 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
- 342 J/kg
- Mixed-layer CIN
- -152 J/kg
- Mixed-layer LCL
- 492 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 351 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
127 WFUS53 KLSX 230036 TORLSX MOC183-189-230115- /O.NEW.KLSX.TO.W.0046.110423T0036Z-110423T0115Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 736 PM CDT FRI APR 22 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... CENTRAL ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI... NORTHWESTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 815 PM CDT * AT 733 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A CONFIRMED DAMAGING TORNADO NEAR DARDENNE PRAIRIE. DOPPLER RADAR SHOWED THIS TORNADO MOVING EAST AT 25 MPH. CONSIDERABLE STRUCTURAL DAMAGE HAS BEEN REPORTED IN NEW MELLE. * LOCATIONS IMPACTED INCLUDE... DARDENNE PRAIRIE...O'FALLON...COTTLEVILLE...WELDON SPRING...ST. PETERS...CLARKSON VALLEY...CHESTERFIELD...ST. CHARLES...MARYLAND HEIGHTS...TOWN AND COUNTRY...ST. ANN...BRIDGETON...CREVE COEUR... OVERLAND...WOODSON TERRACE...OLIVETTE...FRONTENAC...HAZELWOOD... LADUE AND WARSON WOODS. 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 3883 9034 3858 9037 3864 9083 3885 9079 TIME...MOT...LOC 0035Z 273DEG 22KT 3873 9077 $$ GLASS
3 follow-up statements
145 WWUS53 KLSX 230041 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 741 PM CDT FRI APR 22 2011 MOC183-189-230115- /O.CON.KLSX.TO.W.0046.000000T0000Z-110423T0115Z/ ST. LOUIS MO-ST. CHARLES MO- 741 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL ST. CHARLES AND NORTHWESTERN ST. LOUIS COUNTIES UNTIL 815 PM CDT... ...DAMAGING TORNADO MOVING TOWARDS WELDON SPRING... AT 738 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A CONFIRMED DAMAGING TORNADO. THIS TORNADO WAS LOCATED NEAR DARDENNE PRAIRIE...MOVING EAST AT 20 MPH. EXTENSIVE DAMAGE HAS BEEN REPORTED IN NEW MELLE. LOCATIONS IMPACTED INCLUDE... DARDENNE PRAIRIE...O'FALLON...COTTLEVILLE...WELDON SPRING...ST. PETERS...CLARKSON VALLEY...CHESTERFIELD...MARYLAND HEIGHTS...ST. CHARLES...TOWN AND COUNTRY...CREVE COEUR...BRIDGETON...FRONTENAC... ST. ANN...DES PERES...OLIVETTE...OVERLAND...LADUE...WOODSON TERRACE AND WARSON WOODS. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. && LAT...LON 3883 9034 3858 9037 3864 9083 3885 9079 TIME...MOT...LOC 0040Z 277DEG 16KT 3872 9075 $$ GLASS
219 WWUS53 KLSX 230053 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 753 PM CDT FRI APR 22 2011 MOC183-189-230115- /O.CON.KLSX.TO.W.0046.000000T0000Z-110423T0115Z/ ST. LOUIS MO-ST. CHARLES MO- 753 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL ST. CHARLES AND NORTHWESTERN ST. LOUIS COUNTIES UNTIL 815 PM CDT... AT 750 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR HARVESTER...OR NEAR ST. PETERS...MOVING EAST AT 40 MPH. THIS STORM HAS A HISTORY OF PRODUCING DAMAGING TORNADOES. SEEK SHELTER NOW! LOCATIONS IMPACTED INCLUDE... MARYLAND HEIGHTS...TOWN AND COUNTRY...BRIDGETON...DES PERES...CREVE COEUR...FRONTENAC...ST. ANN...WARSON WOODS...OLIVETTE...LADUE... HAZELWOOD...OVERLAND...GLENDALE AND WOODSON TERRACE. 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. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. && LAT...LON 3865 9079 3884 9060 3883 9034 3858 9037 TIME...MOT...LOC 0053Z 277DEG 36KT 3873 9052 $$ GLASS
470 WWUS53 KLSX 230103 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 803 PM CDT FRI APR 22 2011 MOC183-189-230115- /O.CON.KLSX.TO.W.0046.000000T0000Z-110423T0115Z/ ST. LOUIS MO-ST. CHARLES MO- 803 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL ST. CHARLES AND CENTRAL ST. LOUIS COUNTIES UNTIL 815 PM CDT... AT 759 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS SHOWING VERY STRONG INDICATIONS OF A TORNADO ON THE GROUND. THIS DANGEROUS STORM WAS LOCATED NEAR MARYLAND HEIGHTS...MOVING EAST AT 35 MPH. LOCATIONS IMPACTED INCLUDE... WARSON WOODS...GLENDALE...LADUE...ST. ANN...OLIVETTE...OVERLAND... WOODSON TERRACE AND HAZELWOOD. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. && LAT...LON 3869 9060 3884 9049 3883 9034 3858 9037 TIME...MOT...LOC 0103Z 263DEG 31KT 3874 9043 $$ GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:11 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Saint Charles, Warren | 49 min |
| Apr 22, 7:20 PM CDT | Tornado Warning | LSX | Franklin, Gasconade, Saint Charles | 40 min |
| Apr 22, 7:44 PM CDT | Tornado Warning | LSX | Reynolds | 16 min |
| Apr 22, 7:56 PM CDT | Tornado Warning | LSX | Franklin, Jefferson, Saint Louis | 42 min |
| Apr 22, 7:59 PM CDT | Tornado Warning | LSX | Saint Louis, City of Saint Louis | 46 min |
| Apr 22, 8:21 PM CDT | Tornado Warning | LSX | Jefferson, Saint Louis | 39 min |
| Apr 22, 9:00 PM CDT | Flash Flood Warning | LSX | Franklin, Jefferson, Saint Louis | 5 hr |
| Apr 22, 10:18 PM CDT | River Flood Warning | LSX | Jefferson | 8 days |
| Apr 22, 10:55 PM CDT | Flash Flood Warning | LSX | Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more | 6 hr |
| Apr 22, 11:10 PM CDT | River Flood Warning | LSX | Lewis | 25 hr |
| Apr 22, 11:12 PM CDT | Tornado Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 37 min |
| Apr 22, 11:53 PM CDT | River Flood Warning | LSX | Saint Louis, City of Saint Louis | 14 days |
| Apr 23, 1:21 AM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois | 30 min |
| Apr 23, 1:47 AM CDT | River Flood Warning | LSX | Gasconade, Montgomery | 9 days |
| Apr 23, 4:23 AM CDT | Flash Flood Warning | LSX | Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more | 8 hr |
| Apr 23, 6:45 AM CDT | River Flood Warning | LSX | Lewis | 39 hr |
| Apr 23, 12:29 PM CDT | Flash Flood Warning | LSX | Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more | 6 hr |
| Apr 23, 4:59 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 46 min |
| Apr 23, 5:27 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Washington | 48 min |
| Apr 23, 5:41 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Jefferson, Washington | 33 min |
| Apr 23, 6:22 PM CDT | Flash Flood Warning | LSX | Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more | 6 hr |
Nearby
Tornado Warnings in Missouri, 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.