Alert archive / Missouri / Tornado Warnings in 2012
Tornado Warning 18, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Aug 31, 2012, 2:48 PM CDT for Saint Charles County, Saint Louis County, Missouri; Madison County, Illinois. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 31, 2012, 2:48 PM CDT (19:48 UTC)
- Expired
- Aug 31, 2012, 3:05 PM CDT
- In force
- 17 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Madison County, IL, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 19:51 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.
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 31, 1:56 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 202 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
- 947 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 1049 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -60 m²/s²
- 0-3 km storm-relative helicity
- -45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
As transmitted, in the capitals the NWS used until 2016.
881
WFUS53 KLSX 311948
TORLSX
ILC119-MOC183-189-312015-
/O.NEW.KLSX.TO.W.0018.120831T1948Z-120831T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
248 PM CDT FRI AUG 31 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* TORNADO WARNING FOR...
WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
EXTREME NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 315 PM CDT
* AT 246 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR HARTFORD...AND MOVING NORTH AT 30 MPH.
HAZARD...DEVELOPING TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...SIGNIFICANT HOUSE AND BUILDING DAMAGE POSSIBLE. MOBILE
HOMES COMPLETELY DESTROYED IF HIT. SOME TREES UPROOTED OR
SNAPPED. VEHICLES WILL LIKELY BE THROWN BY TORNADIC WINDS.
* LOCATIONS IMPACTED INCLUDE...
WOOD RIVER...BETHALTO...ALTON...GODFREY...HARTFORD...ROXANA...WEST
ALTON AND FOSTERBURG.
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.
&&
LAT...LON 3868 9019 3870 9021 3873 9021 3875 9018
3877 9017 3873 9022 3898 9025 3899 9003
3898 9002 3869 8999
TIME...MOT...LOC 1948Z 175DEG 25KT 3879 9012
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
BROWNING1 follow-up statement
974
WWUS53 KLSX 312005
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
305 PM CDT FRI AUG 31 2012
ILC119-MOC183-189-312015-
/O.CAN.KLSX.TO.W.0018.000000T0000Z-120831T2015Z/
MADISON IL-ST. CHARLES MO-ST. LOUIS MO-
305 PM CDT FRI AUG 31 2012
...THE TORNADO WARNING FOR EXTREME NORTHEASTERN ST. LOUIS...EXTREME
NORTHEASTERN ST. CHARLES AND WESTERN MADISON COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 10 PM CDT.
LAT...LON 3868 9019 3870 9021 3873 9021 3875 9018
3877 9017 3873 9022 3898 9025 3899 9003
3898 9002 3869 8999
TIME...MOT...LOC 2005Z 175DEG 25KT 3891 9013
$$
BROWNINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 5:34 PM CDT | Tornado Warning | LSX | Lincoln, Saint Charles | 11 min |
| Aug 31, 6:52 PM CDT | Areal Flood Advisory | LSX | Audrain | 3 hr |
| Aug 31, 2:44 PM CDT | Tornado Warning | LSX | Greene, Jersey, Pike | 31 min |
| Aug 31, 3:27 PM CDT | Tornado Warning | LSX | Greene, Pike | 48 min |
Nearby
Tornado Warnings in Missouri, 2012Tornado Warnings in Illinois, 2012Every tornado warning in 2012Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.