Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 273, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Sep 6, 2012, 4:38 PM CDT for Jefferson County, Sainte Genevieve County, Saint Louis County, Missouri; Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 37 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
- Sep 6, 2012, 4:38 PM CDT (21:38 UTC)
- Expired
- Sep 6, 2012, 5:15 PM CDT
- In force
- 37 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Jefferson County, MO, Saint Louis County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 62 km from the middle of the area, began a volume at 21:37 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 |
|---|---|---|---|
| Sep 6, 4:40 PM CDT | TSTM WND DMG | Oakville, MO | 6 INCH DIAMETER TREE SPLIT...RELAYED THROUGH THE ST. LOUIS COUNTY EOC |
| Sep 6, 4:40 PM CDT | TSTM WND GST 45 | Olympian Village, MO | |
| Sep 6, 4:40 PM CDT | TSTM WND GST 60 | Oakville, MO | |
| Sep 6, 4:48 PM CDT | TSTM WND GST 45 | Waterloo, IL | 40-45 MPH WINDS WITH OUTFLOW BOUNDARY. |
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 |
|---|---|---|---|
| Sep 6, 12:28 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 270 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
- 2016 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 681 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
The text
As transmitted, in the capitals the NWS used until 2016.
362
WUUS53 KLSX 062138
SVRLSX
ILC133-157-163-MOC099-186-189-062215-
/O.NEW.KLSX.SV.W.0273.120906T2138Z-120906T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
438 PM CDT THU SEP 6 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MONROE COUNTY IN SOUTHWEST ILLINOIS...
NORTHWESTERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
WEST CENTRAL ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
NORTHERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
SOUTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 515 PM CDT
* AT 437 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM BYRNES MILL TO PEVELY TO 5 MILES SOUTHEAST OF
OLYMPIAN VILLAGE...AND MOVING EAST AT 55 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
* LOCATIONS IMPACTED INCLUDE...
BARNHART...HIGH RIDGE...MURPHY...FENTON...SUNSET HILLS...ARNOLD...
MEHLVILLE...OAKVILLE...LEMAY...WATERLOO...COLUMBIA...DUPO...RED
BUD...MILLSTADT...VALMEYER...BLOOMSDALE...FOUNTAIN...NEW DESIGN...
HARRISONVILLE AND PARKDALE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3801 9037 3804 9041 3802 9053 3802 9061
3807 9061 3808 9063 3830 9061 3848 9074
3855 9073 3852 9008 3822 8991 3799 8996
TIME...MOT...LOC 2138Z 279DEG 49KT 3846 9059 3829 9037
3810 9035
HAIL...1.00IN
WIND...60 MPH
$$
KANOFSKY2 follow-up statements
477
WWUS53 KLSX 062203
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
503 PM CDT THU SEP 6 2012
ILC133-157-163-MOC099-186-189-062215-
/O.CON.KLSX.SV.W.0273.000000T0000Z-120906T2215Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-JEFFERSON MO-STE. GENEVIEVE MO-
ST. LOUIS MO-
503 PM CDT THU SEP 6 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
ST. LOUIS...NORTHERN STE. GENEVIEVE...EASTERN JEFFERSON...WEST
CENTRAL ST. CLAIR...NORTHWESTERN RANDOLPH AND MONROE COUNTIES UNTIL
515 PM CDT...
AT 501 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM COLUMBIA TO RED BUD TO EVANSVILLE...AND MOVING
EAST AT 55 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...TRAINED WEATHER SPOTTERS REPORTED 60 MPH WIND GUSTS IN
OAKVILLE WITH THESE STORMS.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
LOCATIONS IMPACTED INCLUDE...
MILLSTADT...BARR...HECKER...PADERBORN AND FLORAVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3801 9037 3804 9041 3803 9049 3840 9048
3854 9051 3852 9008 3822 8991 3799 8996
TIME...MOT...LOC 2203Z 279DEG 49KT 3839 9016 3822 8995
3803 8993
HAIL...1.00IN
WIND...60 MPH
$$
KANOFSKY467
WWUS53 KLSX 062210
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
510 PM CDT THU SEP 6 2012
ILC133-157-163-MOC099-186-189-062220-
/O.EXP.KLSX.SV.W.0273.000000T0000Z-120906T2215Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-JEFFERSON MO-STE. GENEVIEVE MO-
ST. LOUIS MO-
510 PM CDT THU SEP 6 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ST. LOUIS...
NORTHERN STE. GENEVIEVE...EASTERN JEFFERSON...WEST CENTRAL ST.
CLAIR...NORTHWESTERN RANDOLPH AND MONROE COUNTIES WILL EXPIRE AT 515
PM CDT...
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 ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM CDT.
LAT...LON 3801 9037 3804 9041 3803 9049 3840 9048
3854 9051 3852 9008 3822 8991 3799 8996
TIME...MOT...LOC 2210Z 279DEG 49KT 3836 9004 3819 8983
3800 8982
$$
KANOFSKYThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 1:44 PM CDT | Severe Thunderstorm Warning | LSX | Cole, Moniteau | 46 min |
| Sep 6, 2:28 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Cole, Osage | 47 min |
| Sep 6, 2:31 PM CDT | Severe Thunderstorm Warning | LSX | Crawford | 44 min |
| Sep 6, 3:00 PM CDT | Flash Flood Warning | LSX | Crawford | 5 hr |
| Sep 6, 3:13 PM CDT | Severe Thunderstorm Warning | LSX | Saint Francois, Washington | 27 min |
| Sep 6, 3:15 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade | 45 min |
| Sep 6, 3:31 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Washington | 44 min |
| Sep 6, 3:39 PM CDT | Severe Thunderstorm Warning | LSX | Franklin | 54 min |
| Sep 6, 3:58 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 47 min |
| Sep 6, 4:02 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis, Warren, Washington | 43 min |
| Sep 6, 4:20 PM CDT | Severe Thunderstorm Warning | LSX | Madison | 40 min |
| Sep 6, 5:18 PM CDT | Areal Flood Advisory | LSX | Madison, Saint Francois | 3 hr |
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.