Alert archive / Missouri / Tornado Warnings in 2012
Tornado Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Feb 29, 2012, 2:13 AM CST for Jefferson County, Saint Francois County, Washington County, Missouri. It was in force for 20 min. 3 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
- Feb 29, 2012, 2:13 AM CST (08:13 UTC)
- Expired
- Feb 29, 2012, 2:33 AM CST
- In force
- 20 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Jefferson County, MO, Saint Francois County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 08:13 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 |
|---|---|---|---|
| Feb 29, 2:15 AM CST | TSTM WND GST 40 | Potosi, MO | |
| Feb 29, 2:15 AM CST | HAIL 0.25 | Potosi, MO | |
| Feb 29, 2:22 AM CST | TSTM WND GST 50 | De Soto, MO | SMALL TREE LIMBS 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 |
|---|---|---|---|
| Feb 29, 1:14 AM CST | Tornado Watch | SPC | 11 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 8.2 hours before the alert went out and 290 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1465 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 390 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
218 WFUS53 KLSX 290813 TORLSX MOC099-187-221-290845- /O.NEW.KLSX.TO.W.0009.120229T0813Z-120229T0845Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 213 AM CST WED FEB 29 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... SOUTH CENTRAL JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... NORTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI... EAST CENTRAL WASHINGTON COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 245 AM CST * AT 209 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR OLD MINES...OR NEAR POTOSI...AND MOVING EAST AT 55 MPH. * LOCATIONS IMPACTED INCLUDE... DE SOTO...OLYMPIAN VILLAGE...CADET...BLACKWELL AND VALLES MILL. 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. TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW. && LAT...LON 3818 9044 3800 9042 3790 9084 3804 9088 TIME...MOT...LOC 0813Z 254DEG 49KT 3801 9074 $$ TILLY
2 follow-up statements
520
WWUS53 KLSX 290825
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
225 AM CST WED FEB 29 2012
MOC221-290835-
/O.CAN.KLSX.TO.W.0009.000000T0000Z-120229T0845Z/
WASHINGTON MO-
225 AM CST WED FEB 29 2012
...THE TORNADO WARNING FOR EAST CENTRAL WASHINGTON COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3800 9063 3805 9064 3808 9064 3808 9066
3809 9066 3809 9065 3810 9066 3818 9044
3800 9042
TIME...MOT...LOC 0825Z 253DEG 48KT 3807 9052
$$
MOC099-187-290845-
/O.CON.KLSX.TO.W.0009.000000T0000Z-120229T0845Z/
JEFFERSON MO-ST. FRANCOIS MO-
225 AM CST WED FEB 29 2012
...A TORNADO WARNING REMAINS IN EFFECT FOR EXTREME NORTHERN ST.
FRANCOIS AND SOUTH CENTRAL JEFFERSON COUNTIES UNTIL 245 AM CST...
AT 223 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 5 MILES SOUTH OF DE SOTO...MOVING EAST AT 55 MPH.
LOCATIONS IMPACTED INCLUDE...
OLYMPIAN VILLAGE.
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.
TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.
&&
LAT...LON 3800 9063 3805 9064 3808 9064 3808 9066
3809 9066 3809 9065 3810 9066 3818 9044
3800 9042
TIME...MOT...LOC 0825Z 253DEG 48KT 3807 9052
$$
TILLY821
WWUS53 KLSX 290833
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
233 AM CST WED FEB 29 2012
MOC099-187-290843-
/O.CAN.KLSX.TO.W.0009.000000T0000Z-120229T0845Z/
JEFFERSON MO-ST. FRANCOIS MO-
233 AM CST WED FEB 29 2012
...THE TORNADO WARNING FOR EXTREME NORTHERN ST. FRANCOIS AND SOUTH
CENTRAL JEFFERSON COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 900 AM CST.
LAT...LON 3800 9063 3805 9064 3808 9064 3808 9066
3809 9066 3809 9065 3810 9066 3818 9044
3800 9042
TIME...MOT...LOC 0833Z 250DEG 56KT 3812 9036
$$
TILLYThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 29, 1:21 AM CST | Tornado Warning | LSX | Crawford | 39 min |
| Feb 29, 1:52 AM CST | Severe Thunderstorm Warning | LSX | Jefferson, Saint Francois, Washington | 53 min |
| Feb 29, 2:22 AM CST | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 38 min |
| Feb 29, 2:31 AM CST | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve | 31 min |
| Feb 29, 2:50 AM CST | Severe Thunderstorm Warning | LSX | Madison | 40 min |
| Feb 29, 3:05 AM CST | Tornado Warning | LSX | Madison | 25 min |
Nearby
Tornado Warnings in Missouri, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.