Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 448, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 7, 2011, 5:55 PM CDT for Monroe County, Saint Clair County, Illinois; 4 counties in Missouri. It was in force for 50 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
- Jul 7, 2011, 5:55 PM CDT (22:55 UTC)
- Expired
- Jul 7, 2011, 6:45 PM CDT
- In force
- 50 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 22:56 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 |
|---|---|---|---|
| Jul 7, 6:12 PM CDT | TSTM WND GST 50 | 2 E Scotsdale, MO |
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 |
|---|---|---|---|
| Jul 7, 5:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 243 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
- 894 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 836 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
226
WUUS53 KLSX 072255
SVRLSX
ILC133-163-MOC071-099-189-510-072345-
/O.NEW.KLSX.SV.W.0448.110707T2255Z-110707T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
555 PM CDT THU JUL 7 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
SOUTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
CENTRAL ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
ST. LOUIS CITY IN EAST CENTRAL MISSOURI...
* UNTIL 645 PM CDT
* AT 551 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM BALLWIN TO HOUSE SPRINGS TO DITTMER...AND MOVING EAST AT 20
MPH.
* LOCATIONS IMPACTED INCLUDE...
MURPHY...VALLEY PARK...TOWN AND COUNTRY...FENTON...DES PERES...
ANTONIA...CREVE COEUR...KIRKWOOD...SUNSET HILLS...FRONTENAC...
HILLSBORO...WARSON WOODS...OAKLAND...CRESTWOOD...LADUE...
GLENDALE...OLIVETTE...ARNOLD...WEBSTER GROVES AND BRENTWOOD.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 3820 9032 3821 9089 3839 9063 3868 9065
3868 9019 3866 9018 3866 9009 3836 9008
TIME...MOT...LOC 2255Z 274DEG 17KT 3861 9052 3838 9051
3828 9067
WIND...HAIL 60MPH <.75IN
$$
TRUETT3 follow-up statements
899
WWUS53 KLSX 072325
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
625 PM CDT THU JUL 7 2011
MOC071-072334-
/O.CAN.KLSX.SV.W.0448.000000T0000Z-110707T2345Z/
FRANKLIN MO-
625 PM CDT THU JUL 7 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRANKLIN COUNTY
IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA. HOWEVER...ADDITIONAL STRONG STORMS ARE POSSIBLE...AND
A SEVERE THUNDERSTORM WATCH CONTINUES UNTIL MIDNIGHT.
LAT...LON 3820 9032 3821 9073 3842 9049 3868 9039
3868 9019 3866 9018 3866 9009 3836 9008
TIME...MOT...LOC 2324Z 274DEG 17KT 3860 9035 3838 9036
3822 9054
$$
ILC133-163-MOC099-189-510-072345-
/O.CON.KLSX.SV.W.0448.000000T0000Z-110707T2345Z/
MONROE IL-ST. CLAIR IL-JEFFERSON MO-ST. LOUIS MO-ST. LOUIS CITY MO-
625 PM CDT THU JUL 7 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ST. LOUIS
CITY...SOUTH CENTRAL ST. LOUIS...NORTHERN JEFFERSON...NORTHWESTERN
ST. CLAIR AND NORTHWESTERN MONROE COUNTIES UNTIL 645 PM CDT...
AT 621 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM GLENDALE TO ARNOLD TO HILLSBORO...MOVING EAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE...
BARNHART...LAKESHIRE...UNIVERSITY CITY...RICHMOND HEIGHTS...
CLAYTON...SHREWSBURY...AFFTON...MAPLEWOOD...MEHLVILLE...OAKVILLE...
PEVELY...LEMAY...HERCULANEUM...ST. LOUIS...FESTUS...COLUMBIA...
CRYSTAL CITY...DUPO...CAHOKIA AND WATERLOO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3820 9032 3821 9073 3842 9049 3868 9039
3868 9019 3866 9018 3866 9009 3836 9008
TIME...MOT...LOC 2324Z 274DEG 17KT 3860 9035 3838 9036
3822 9054
WIND...HAIL 60MPH <.75IN
$$
TRUETT980
WWUS53 KLSX 072337
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
637 PM CDT THU JUL 7 2011
MOC510-072347-
/O.CAN.KLSX.SV.W.0448.000000T0000Z-110707T2345Z/
ST. LOUIS CITY MO-
637 PM CDT THU JUL 7 2011
...THE SEVERE THUNDERSTORM WARNING FOR ST. LOUIS CITY IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED.
HOWEVER...ADDITIONAL STRONG STORMS ARE POSSIBLE AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT.
LAT...LON 3820 9032 3821 9073 3840 9041 3854 9037
3852 9008 3836 9008
TIME...MOT...LOC 2337Z 274DEG 17KT 3851 9026 3837 9029
3821 9047
$$
ILC133-163-MOC099-189-072345-
/O.CON.KLSX.SV.W.0448.000000T0000Z-110707T2345Z/
MONROE IL-ST. CLAIR IL-JEFFERSON MO-ST. LOUIS MO-
637 PM CDT THU JUL 7 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
ST. LOUIS...CENTRAL JEFFERSON...WEST CENTRAL ST. CLAIR AND
NORTHWESTERN MONROE COUNTIES UNTIL 645 PM CDT...
AT 634 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM LEMAY TO FOUNTAIN TO HILLSBORO...MOVING EAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE...
HERCULANEUM...COLUMBIA...FESTUS...DUPO...CRYSTAL CITY...WATERLOO...
MILLSTADT...FOUNTAIN...VALMEYER...HARRISONVILLE...NEW HANDOVER...
FOSTER POND...MONROE CITY...MADONNAVILLE...WARTBURG AND BARR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 3820 9032 3821 9073 3840 9041 3854 9037
3852 9008 3836 9008
TIME...MOT...LOC 2337Z 274DEG 17KT 3851 9026 3837 9029
3821 9047
WIND...HAIL 60MPH <.75IN
$$
TRUETT302
WWUS53 KLSX 072352
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
652 PM CDT THU JUL 7 2011
ILC133-163-MOC099-189-080002-
/O.EXP.KLSX.SV.W.0448.000000T0000Z-110707T2345Z/
MONROE IL-ST. CLAIR IL-JEFFERSON MO-ST. LOUIS MO-
652 PM CDT THU JUL 7 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. LOUIS...
CENTRAL JEFFERSON...WEST CENTRAL ST. CLAIR AND NORTHWESTERN MONROE
COUNTIES HAS EXPIRED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY. HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT.
LAT...LON 3820 9032 3821 9073 3840 9041 3854 9037
3852 9008 3836 9008
TIME...MOT...LOC 2337Z 274DEG 17KT 3851 9026 3837 9029
3821 9047
$$
TRUETTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 5:41 PM CDT | Flash Flood Warning | LSX | Fayette, Marion | 6 hr |
| Jul 7, 6:29 PM CDT | Flash Flood Warning | LSX | Monroe, Randolph, Saint Clair | 6 hr |
| Jul 7, 6:39 PM CDT | Areal Flood Advisory | LSX | Bond, Fayette, Greene, Jersey, Macoupin, Montgomery | 6 hr |
| Jul 6, 8:31 PM CDT | Areal Flood Advisory | LSX | Saint Louis, City of Saint Louis | 3 hr |
| Jul 7, 5:24 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Saint Francois, Washington | 24 min |
| Jul 7, 5:46 PM CDT | Areal Flood Advisory | LSX | Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis | 3 hr |
| Jul 7, 6:42 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois | 48 min |
| Jul 7, 6:47 PM CDT | Tornado Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois | 28 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2011Severe Thunderstorm Warnings in Illinois, 2011Every severe thunderstorm warning 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.