Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 233, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 4, 2012, 11:46 PM CDT for Lincoln County, Saint Charles County, Warren County, Missouri. It was in force for 33 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
- Aug 4, 2012, 11:46 PM CDT (04:46 UTC)
- Expired
- Aug 5, 2012, 12:19 AM CDT
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lincoln County, MO, Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 25 km from the middle of the area, began a volume at 04:48 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 5, 12:02 AM CDT | HAIL 0.25 | Wentzville, 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 |
|---|---|---|---|
| Aug 4, 6:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.8 hours before the alert went out and 240 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.
621
WUUS53 KLSX 050446
SVRLSX
MOC113-183-219-050530-
/O.NEW.KLSX.SV.W.0233.120805T0446Z-120805T0530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1146 PM CDT SAT AUG 4 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
NORTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
EASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 1230 AM CDT
* AT 1143 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WRIGHT
CITY...AND MOVING EAST AT 40 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...
WENTZVILLE...LAKE ST. LOUIS...DARDENNE PRAIRIE...ST. PAUL...
O'FALLON...COTTLEVILLE...ST. PETERS...NEW MELLE...MOSCOW MILLS...
WINFIELD...FLINT HILL AND OLD MONROE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3903 9071 3876 9059 3867 9111 3889 9115
TIME...MOT...LOC 0446Z 261DEG 45KT 3881 9096
HAIL...1.00IN
WIND...60 MPH
$$
GKS3 follow-up statements
258
WWUS53 KLSX 050459
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1159 PM CDT SAT AUG 4 2012
MOC113-183-219-050530-
/O.CON.KLSX.SV.W.0233.000000T0000Z-120805T0530Z/
LINCOLN MO-ST. CHARLES MO-WARREN MO-
1159 PM CDT SAT AUG 4 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WARREN...NORTHWESTERN ST. CHARLES AND SOUTHEASTERN LINCOLN COUNTIES
UNTIL 1230 AM CDT...
AT 1156 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WENTZVILLE...
AND MOVING EAST AT 25 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
LOCATIONS IMPACTED INCLUDE...
LAKE ST. LOUIS...DARDENNE PRAIRIE...ST. PAUL...O'FALLON...
COTTLEVILLE...ST. PETERS...WINFIELD AND OLD MONROE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!
&&
LAT...LON 3903 9071 3876 9059 3867 9111 3889 9115
TIME...MOT...LOC 0459Z 254DEG 21KT 3882 9085
HAIL...1.00IN
WIND...60 MPH
$$
GKS092
WWUS53 KLSX 050511
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1211 AM CDT SUN AUG 5 2012
MOC219-050520-
/O.CAN.KLSX.SV.W.0233.000000T0000Z-120805T0530Z/
WARREN MO-
1211 AM CDT SUN AUG 5 2012
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WARREN COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3890 9094 3901 9070 3876 9059 3871 9091
TIME...MOT...LOC 0510Z 254DEG 21KT 3884 9078
$$
MOC113-183-050530-
/O.CON.KLSX.SV.W.0233.000000T0000Z-120805T0530Z/
LINCOLN MO-ST. CHARLES MO-
1211 AM CDT SUN AUG 5 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL ST.
CHARLES AND SOUTHEASTERN LINCOLN COUNTIES UNTIL 1230 AM CDT...
AT 1209 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ST. PAUL...
AND MOVING EAST AT 25 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
LOCATIONS IMPACTED INCLUDE...
DARDENNE PRAIRIE...ST. PAUL...O'FALLON...COTTLEVILLE...ST. PETERS...
WINFIELD AND OLD MONROE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!
&&
LAT...LON 3890 9094 3901 9070 3876 9059 3871 9091
TIME...MOT...LOC 0510Z 254DEG 21KT 3884 9078
HAIL...1.00IN
WIND...60 MPH
$$
GKS196 WWUS53 KLSX 050519 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1219 AM CDT SUN AUG 5 2012 MOC113-183-050530- /O.CAN.KLSX.SV.W.0233.000000T0000Z-120805T0530Z/ LINCOLN MO-ST. CHARLES MO- 1219 AM CDT SUN AUG 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ST. CHARLES AND SOUTHEASTERN LINCOLN COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 3890 9094 3901 9070 3876 9059 3871 9091 TIME...MOT...LOC 0520Z 254DEG 21KT 3886 9071 $$ GKS
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, 10:22 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Saint Charles, Saint Louis, City of Saint Louis | 38 min |
| Aug 4, 10:59 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve | 46 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 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.