Alert archive / Missouri / Tornado Warnings in 2010
Tornado Warning 35, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 30, 2010, 8:54 PM CDT for Jefferson County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Monroe County, Saint Clair County, Illinois. It was in force for 51 min. 1 report 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 30, 2010, 8:54 PM CDT (01:54 UTC)
- Expired
- Apr 30, 2010, 9:45 PM CDT
- In force
- 51 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 46 km from the middle of the area, began a volume at 01:57 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 30, 9:00 PM CDT | TSTM WND GST 70 | 4 S Columbia, IL |
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 30, 2:40 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.9 hours before the alert went out and 238 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
- 1090 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 718 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 340 m²/s²
- 0-3 km storm-relative helicity
- 345 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 10.4
The text
As transmitted, in the capitals the NWS used until 2016.
397 WFUS53 KLSX 010154 TORLSX ILC119-133-163-MOC099-189-510-010245- /O.NEW.KLSX.TO.W.0035.100501T0154Z-100501T0245Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 854 PM CDT FRI APR 30 2010 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... SOUTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS... NORTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS... NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS... NORTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... SOUTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI... ST. LOUIS CITY IN EAST CENTRAL MISSOURI... * UNTIL 945 PM CDT * AT 848 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO NEAR BARNHART. DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT 40 MPH. MULTIPLE REPORTS OF DAMAGE HAVE BEEN RECEIVED IN HILLSBORO AND OTTO IN JEFFERSON COUNTY. * LOCATIONS IMPACTED INCLUDE... MURPHY...ARNOLD...VALLEY PARK...FENTON...OAKVILLE...WATERLOO... SUNSET HILLS...MEHLVILLE...DES PERES...KIRKWOOD...CRESTWOOD... COLUMBIA...LAKESHIRE...OAKLAND...AFFTON...GLENDALE...WARSON WOODS...LEMAY...WEBSTER GROVES AND FRONTENAC. 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. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. && LAT...LON 3823 9038 3848 9061 3880 9021 3847 8974 TIME...MOT...LOC 0153Z 222DEG 35KT 3836 9032 $$ KANOFSKY
3 follow-up statements
964 WWUS53 KLSX 010207 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 907 PM CDT FRI APR 30 2010 ILC119-133-163-MOC099-189-510-010245- /O.CON.KLSX.TO.W.0035.000000T0000Z-100501T0245Z/ MONROE IL-ST. CLAIR IL-MADISON IL-JEFFERSON MO-ST. LOUIS CITY MO- ST. LOUIS MO- 907 PM CDT FRI APR 30 2010 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN ST. LOUIS... ST. LOUIS CITY...NORTHEASTERN JEFFERSON...SOUTHWESTERN MADISON...ST. CLAIR AND NORTHERN MONROE COUNTIES UNTIL 945 PM CDT... AT 902 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING TORNADOES. THERE ARE TWO CIRCULATIONS WITH THIS DANGEROUS STORM...BOTH LOCATED NORTHWEST OF WATERLOO. THIS STORM WAS MOVING NORTHEAST AT 45 MPH. THE TORNADOES ARE LIKELY RAIN-WRAPPED AND WILL BE DIFFICULT TO SEE AT NIGHT. THIS STORM HAS A HISTORY OF PRODUCING DAMAGING TORNADOES. TAKE SHELTER IMMEDIATELY. LOCATIONS IMPACTED INCLUDE... WEBSTER GROVES...FRONTENAC...SHREWSBURY...LADUE...DUPO... BRENTWOOD...MAPLEWOOD...MILLSTADT...RICHMOND HEIGHTS...CLAYTON... UNIVERSITY CITY...CAHOKIA...ST. LOUIS...HILLSDALE...FREEBURG... NORMANDY...CENTREVILLE...NORTHWOODS...EAST ST. LOUIS AND BELLEVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. && LAT...LON 3823 9038 3848 9061 3880 9021 3847 8974 TIME...MOT...LOC 0206Z 222DEG 37KT 3847 9021 $$ KANOFSKY
430
WWUS53 KLSX 010218
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
918 PM CDT FRI APR 30 2010
MOC099-189-010227-
/O.CAN.KLSX.TO.W.0035.000000T0000Z-100501T0245Z/
JEFFERSON MO-ST. LOUIS MO-
918 PM CDT FRI APR 30 2010
...THE TORNADO WARNING FOR SOUTHEASTERN ST. LOUIS AND NORTHEASTERN
JEFFERSON COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3828 9026 3852 9027 3866 9029 3877 9018
3847 8974
TIME...MOT...LOC 0217Z 222DEG 37KT 3855 9011
$$
ILC119-133-163-MOC510-010245-
/O.CON.KLSX.TO.W.0035.000000T0000Z-100501T0245Z/
MONROE IL-ST. CLAIR IL-MADISON IL-ST. LOUIS CITY MO-
918 PM CDT FRI APR 30 2010
...A TORNADO WARNING REMAINS IN EFFECT FOR ST. LOUIS CITY...
SOUTHWESTERN MADISON...NORTHERN ST. CLAIR AND NORTHERN MONROE
COUNTIES UNTIL 945 PM CDT...
AT 915 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR CENTREVILLE...MOVING NORTHEAST AT 45 MPH.
THIS STORM HAS A HISTORY OF PRODUCING STRUCTURAL DAMAGE NEAR LAKE
TISHOMINGO IN JEFFERSON COUNTY.
LOCATIONS IMPACTED INCLUDE...
FREEBURG...CENTREVILLE...EAST ST. LOUIS...BELLEVILLE...SWANSEA...
VENICE...WASHINGTON PARK...MADISON...FAIRVIEW HEIGHTS...
CASEYVILLE...SHILOH...GRANITE CITY...MASCOUTAH...SCOTT AFB...
BROOKLYN AND FAIRMONT CITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3828 9026 3852 9027 3866 9029 3877 9018
3847 8974
TIME...MOT...LOC 0217Z 222DEG 37KT 3855 9011
$$
KANOFSKY211
WWUS53 KLSX 010235
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
935 PM CDT FRI APR 30 2010
ILC133-MOC510-010243-
/O.CAN.KLSX.TO.W.0035.000000T0000Z-100501T0245Z/
MONROE IL-ST. LOUIS CITY MO-
935 PM CDT FRI APR 30 2010
...THE TORNADO WARNING FOR ST. LOUIS CITY AND NORTH CENTRAL MONROE
COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3835 9006 3836 9007 3859 9019 3873 9012
3847 8974
TIME...MOT...LOC 0233Z 222DEG 37KT 3867 8997
$$
ILC119-163-010245-
/O.CON.KLSX.TO.W.0035.000000T0000Z-100501T0245Z/
ST. CLAIR IL-MADISON IL-
935 PM CDT FRI APR 30 2010
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHWESTERN MADISON AND
NORTHERN ST. CLAIR COUNTIES UNTIL 945 PM CDT...
...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN CLINTON COUNTY...
SOUTHEASTERN MADISON COUNTY...ST. CLAIR COUNTY...AND WEST CENTRAL
WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS UNTIL 1015 PM CDT...
AT 929 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR CASEYVILLE...MOVING NORTHEAST AT 45 MPH.
THIS STORM HAS A HISTORY OF PRODUCING DAMAGING TORNADOES.
LOCATIONS IMPACTED INCLUDE...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3835 9006 3836 9007 3859 9019 3873 9012
3847 8974
TIME...MOT...LOC 0233Z 222DEG 37KT 3867 8997
$$
KANOFSKYThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 7:40 PM CDT | Tornado Warning | LSX | Crawford, Franklin, Jefferson, Washington | 50 min |
| Apr 30, 7:45 PM CDT | Flash Flood Warning | LSX | Crawford | 6 hr |
| Apr 30, 7:55 PM CDT | Tornado Warning | LSX | Jefferson, Saint Francois, Washington | 50 min |
| Apr 30, 8:07 PM CDT | Tornado Warning | LSX | Reynolds | 38 min |
| Apr 30, 8:14 PM CDT | Flash Flood Warning | LSX | Franklin, Jefferson, Washington | 6 hr |
| Apr 30, 8:21 PM CDT | Tornado Warning | LSX | Jefferson, Saint Louis | 39 min |
| Apr 30, 8:39 PM CDT | Flash Flood Warning | LSX | Saint Louis, City of Saint Louis | 6 hr |
| Apr 30, 8:43 PM CDT | Tornado Warning | LSX | Iron, Reynolds | 47 min |
| Apr 30, 9:02 PM CDT | Tornado Warning | LSX | Jefferson, Sainte Genevieve | 29 min |
| Apr 30, 9:10 PM CDT | Tornado Warning | LSX | Iron, Madison | 50 min |
| Apr 30, 9:23 PM CDT | Tornado Warning | LSX | Sainte Genevieve, Saint Francois | 37 min |
| Apr 30, 9:51 PM CDT | Tornado Warning | LSX | Sainte Genevieve | 39 min |
| May 1, 3:54 AM CDT | Flash Flood Watch | LSX | Crawford, Iron, Jefferson, Madison, Reynolds, Sainte Genevieve and 2 more | 23 hr |
| Apr 30, 9:25 PM CDT | Tornado Warning | LSX | Clinton, Madison, Saint Clair, Washington | 34 min |
Nearby
Tornado Warnings in Missouri, 2010Tornado Warnings in Illinois, 2010Every tornado warning in 2010Tornadoes in 2010
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.