Alert archive / Missouri / Tornado Warnings in 2012
Tornado Warning 4, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Jan 17, 2012, 2:12 AM CST for Franklin County, Jefferson County, Washington 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
- Jan 17, 2012, 2:12 AM CST (08:12 UTC)
- Expired
- Jan 17, 2012, 2:45 AM CST
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Franklin County, MO, Jefferson County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 48 km from the middle of the area, began a volume at 08:14 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 |
|---|---|---|---|
| Jan 17, 2:38 AM CST | HAIL 1 | Lonedell, 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 |
|---|---|---|---|
| Jan 16, 11:47 PM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 8.2 hours before the alert went out and 282 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
- 2 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 748 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 431 m²/s²
- 0-3 km storm-relative helicity
- 500 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
256 WFUS53 KLSX 170812 TORLSX MOC071-099-221-170845- /O.NEW.KLSX.TO.W.0004.120117T0812Z-120117T0845Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 212 AM CST TUE JAN 17 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... SOUTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI... WESTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... NORTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 245 AM CST * AT 210 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR SULLIVAN...AND MOVING EAST AT 55 MPH. LARGE...GOLF BALL SIZED HAIL IS ALSO POSSIBLE WITH THIS STORM. * LOCATIONS IMPACTED INCLUDE... CEDAR HILL...RICHWOODS...LONEDELL...DITTMER...PINEY PARK... FLETCHER...GRUBVILLE...OERMANN AND MORSE 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. && LAT...LON 3842 9064 3815 9060 3811 9110 3830 9109 TIME...MOT...LOC 0811Z 253DEG 49KT 3820 9106 $$ TRUETT
2 follow-up statements
697 WWUS53 KLSX 170826 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 226 AM CST TUE JAN 17 2012 MOC071-099-221-170845- /O.CON.KLSX.TO.W.0004.000000T0000Z-120117T0845Z/ FRANKLIN MO-JEFFERSON MO-WASHINGTON MO- 226 AM CST TUE JAN 17 2012 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL WASHINGTON...WEST CENTRAL JEFFERSON AND SOUTHEASTERN FRANKLIN COUNTIES UNTIL 245 AM CST... AT 222 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 5 MILES SOUTHWEST OF LONEDELL...OR 9 MILES SOUTHEAST OF ST. CLAIR...MOVING EAST AT 55 MPH. LOCATIONS IMPACTED INCLUDE... CEDAR HILL...DITTMER...GRUBVILLE...OERMANN AND MORSE MILL. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. && LAT...LON 3816 9100 3830 9105 3842 9064 3820 9061 TIME...MOT...LOC 0826Z 253DEG 49KT 3826 9081 $$ TRUETT
923 WWUS53 KLSX 170843 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 243 AM CST TUE JAN 17 2012 MOC071-099-221-170852- /O.EXP.KLSX.TO.W.0004.000000T0000Z-120117T0845Z/ FRANKLIN MO-JEFFERSON MO-WASHINGTON MO- 243 AM CST TUE JAN 17 2012 ...THE TORNADO WARNING FOR NORTH CENTRAL WASHINGTON...WEST CENTRAL JEFFERSON AND SOUTHEASTERN FRANKLIN COUNTIES WILL EXPIRE AT 245 AM CST... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. HOWEVER...A TORNADO WARNING IS IN EFFECT FOR NORTHERN JEFFERSON COUNTY UNTIL 315 PM. ALSO...ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 7 AM. LAT...LON 3816 9100 3830 9105 3842 9064 3820 9061 TIME...MOT...LOC 0842Z 253DEG 49KT 3832 9054 $$ TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 16, 11:59 PM CST | Severe Thunderstorm Warning | LSX | Callaway, Cole, Gasconade, Montgomery, Osage | 58 days |
| Jan 17, 12:39 AM CST | Tornado Warning | LSX | Gasconade, Osage | 36 min |
| Jan 17, 12:55 AM CST | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 35 min |
| Jan 17, 1:14 AM CST | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 31 min |
| Jan 17, 1:23 AM CST | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 37 min |
| Jan 17, 1:39 AM CST | Tornado Warning | LSX | Franklin, Jefferson | 36 min |
| Jan 17, 1:41 AM CST | Tornado Warning | LSX | Crawford, Franklin | 34 min |
| Jan 17, 2:08 AM CST | Severe Thunderstorm Warning | LSX | Jefferson, Saint Louis, City of Saint Louis | 37 min |
| Jan 17, 2:35 AM CST | Tornado Warning | LSX | Jefferson, Saint Louis | 40 min |
| Jan 17, 4:18 AM CST | Severe Thunderstorm Warning | LSX | Crawford | 27 min |
| Jan 17, 4:34 AM CST | Areal Flood Advisory | LSX | Cole, Crawford, Franklin, Gasconade, Jefferson, Saint Charles and 3 more | 60 days |
| Jan 17, 5:22 AM CST | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve | 38 min |
| Jan 17, 6:01 AM CST | Severe Thunderstorm Warning | LSX | Iron, Sainte Genevieve, Saint Francois, Washington | 44 min |
| Jan 17, 6:25 AM CST | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds, Saint Francois | 50 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.