Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 231, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 4, 2012, 10:22 PM CDT for 4 counties in Missouri; Madison County, Monroe County, Saint Clair County, Illinois. It was in force for 38 min. 4 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
- Aug 4, 2012, 10:22 PM CDT (03:22 UTC)
- Expired
- Aug 4, 2012, 11:00 PM CDT
- In force
- 38 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 38 km from the middle of the area, began a volume at 03:25 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 |
|---|---|---|---|
| Aug 4, 10:25 PM CDT | TSTM WND DMG | Chesterfield, MO | 3-6 INCH DIAMETER TREE LIMBS BLOWN DOWN |
| Aug 4, 10:25 PM CDT | TSTM WND GST 65 | Maryland Heights, MO | |
| Aug 4, 10:35 PM CDT | TSTM WND GST 52 | Kirkwood, MO | |
| Aug 4, 10:39 PM CDT | TSTM WND DMG | 2 N Byrnes Mill, MO | SEVERAL TREES BLOWN DOWN. |
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 |
|---|---|---|---|
| Aug 4, 6:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.4 hours before the alert went out and 216 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
- 857 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1700 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
851
WUUS53 KLSX 050322
SVRLSX
ILC119-133-163-MOC099-183-189-510-050400-
/O.NEW.KLSX.SV.W.0231.120805T0322Z-120805T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1022 PM CDT SAT AUG 4 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
EXTREME NORTH CENTRAL MONROE COUNTY IN SOUTHWEST ILLINOIS...
NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
NORTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
SOUTHERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
ST. LOUIS CITY IN EAST CENTRAL MISSOURI...
* UNTIL 1100 PM CDT
* AT 1016 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM DARDENNE PRAIRIE TO DITTMER...AND MOVING EAST
AT 45 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
* LOCATIONS IMPACTED INCLUDE...
CLARKSON VALLEY...ELLISVILLE...ST. PETERS...CHESTERFIELD...
BALLWIN...HIGH RIDGE...MANCHESTER...ST. CHARLES...MURPHY...
VALLEY PARK...TOWN AND COUNTRY...MARYLAND HEIGHTS...FENTON...
DES PERES...CREVE COEUR...KIRKWOOD...SUNSET HILLS...FRONTENAC...
BRIDGETON...WARSON WOODS...AND THE CITY OF ST. LOUIS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3884 8999 3844 9000 3845 9062 3883 9062
TIME...MOT...LOC 0321Z 266DEG 41KT 3875 9066 3835 9065
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT2 follow-up statements
770
WWUS53 KLSX 050349
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1049 PM CDT SAT AUG 4 2012
ILC119-133-163-MOC099-183-189-510-050400-
/O.CON.KLSX.SV.W.0231.000000T0000Z-120805T0400Z/
MADISON IL-MONROE IL-ST. CLAIR IL-JEFFERSON MO-ST. CHARLES MO-
ST. LOUIS MO-ST. LOUIS CITY MO-
1049 PM CDT SAT AUG 4 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ST. LOUIS
CITY...ST. LOUIS...CENTRAL ST. CHARLES...NORTHEASTERN JEFFERSON...
NORTHWESTERN ST. CLAIR...EXTREME NORTH CENTRAL MONROE AND
SOUTHWESTERN MADISON COUNTIES UNTIL 1100 PM CDT...
AT 1044 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM ST. CHARLES TO HOUSE SPRINGS...AND MOVING EAST AT
30 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED...WITH A WEAKENING TREND NOTED IN THE HIGH
WINDS.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
LOCATIONS IMPACTED INCLUDE...
MURPHY...VALLEY PARK...TOWN AND COUNTRY...MARYLAND HEIGHTS...
FENTON...DES PERES...CREVE COEUR...BRIDGETON...KIRKWOOD...SUNSET
HILLS...FRONTENAC...WARSON WOODS...ST.
ANN...OAKLAND...LADUE...CRESTWOOD...GLENDALE...OLIVETTE...OVERLAND...
LAMBERT FIELD...AND ST LOUIS CITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3884 8999 3844 9000 3845 9062 3883 9062
TIME...MOT...LOC 0347Z 264DEG 26KT 3882 9051 3842 9051
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT067 WWUS53 KLSX 050402 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1102 PM CDT SAT AUG 4 2012 ILC119-133-163-MOC099-183-189-510-050411- /O.EXP.KLSX.SV.W.0231.000000T0000Z-120805T0400Z/ MADISON IL-MONROE IL-ST. CLAIR IL-JEFFERSON MO-ST. CHARLES MO- ST. LOUIS MO-ST. LOUIS CITY MO- 1102 PM CDT SAT AUG 4 2012 ...THE SEVERE THUNDERSTORM WARNING FOR ST. LOUIS CITY... ST. LOUIS...SOUTHERN ST. CHARLES...NORTHEASTERN JEFFERSON...NORTHWESTERN ST. CLAIR...EXTREME NORTH CENTRAL MONROE AND SOUTHWESTERN MADISON COUNTIES HAS EXPIRED... THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. HOWEVER GUSTY WINDS OF 30 TO 40 MPH AND POCKETS OF HEAVY RAIN WILL CONTINUE OVER THE METRO AREA THROUGH 1130 PM. LAT...LON 3884 8999 3844 9000 3845 9062 3883 9062 TIME...MOT...LOC 0349Z 264DEG 26KT 3882 9049 3842 9049 $$ TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 8:30 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Gasconade, Montgomery, Osage | 45 min |
| Aug 4, 8:47 PM CDT | Severe Thunderstorm Warning | LSX | Gasconade, Osage | 43 min |
| Aug 4, 9:07 PM CDT | Severe Thunderstorm Warning | LSX | Gasconade, Montgomery, Osage, Warren | 23 min |
| Aug 4, 9:20 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade, Warren, Washington | 40 min |
| Aug 4, 9:38 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis, Warren, Washington | 67 min |
| Aug 4, 10:59 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve | 46 min |
| Aug 4, 11:46 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 33 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2012Severe Thunderstorm Warnings in Illinois, 2012Every severe thunderstorm warning in 2012
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.