Alert archive / Missouri / Tornado Warnings in 2021

Tornado Warning 39, NWS St. Louis, MO

December 10, 20215 counties in Missouri

NWS St. Louis, MO issued this tornado warning at Dec 10, 2021, 6:30 PM CST for 5 counties in Missouri. It was in force for 45 min. 5 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: Dec 10, 2021, 6:30 PM CST (00:30 UTC)
Expired: Dec 10, 2021, 7:15 PM CST
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Callaway County, MO, Cole County, MO, Gasconade County, MO, Montgomery County, MO, Osage County, MO

The radar

The St Louis radar (KLSX), 101 km from the middle of the area, began a volume at 00:29 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
Dec 10, 6:30 PM CST	TSTM WND DMG	2 N Westphalia, MO	OSAGE COUNTY SHERIFFS OFFICE REPORTED A ROOF OFF A BUSINESS AT 674 HWY 63. TIME ESTIMATED FROM RADAR.
Dec 10, 6:31 PM CST	TSTM WND DMG	3 N Westphalia, MO	TREE DOWN BLOCKING BOTH LANES OF HIGHWAY 63 APPROX 1 MILE SOUTH OF HIGHWAY 50.
Dec 10, 6:34 PM CST	TSTM WND DMG	2 Sse Loose Creek, MO	OSAGE COUNTY SHERIFFS OFFICE REPORTED A TRAMPOLINE WAS BLOWN INTO THE SIDE OF A HOUSE. TIME ESTIMATED FROM RADAR.
Dec 10, 6:35 PM CST	TSTM WND DMG	1 Ese Loose Creek, MO	OSAGE COUNTY SHERIFFS OFFICE REPORTED HOME DAMAGE ALONG LOOSE CREEK HIGHWAY. TIME ESTIMATED FROM RADAR.
Dec 10, 6:53 PM CST	TSTM WND DMG	2 W Gasconade, MO	GASCONADE COUNTY DISPATCH REPORTED TREES DOWN ALONG HWY 100 BETWEEN MORRISON AND GASCONADE. TIME ESTIMATED FROM RADAR.

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
Dec 10, 5:17 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.5 hours before the alert went out and 252 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 637 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1113 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 344 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.4

Open this sounding in Storm Lab

The text

As transmitted.

040 
WFUS53 KLSX 110030
TORLSX
MOC027-051-073-139-151-110115-
/O.NEW.KLSX.TO.W.0039.211211T0030Z-211211T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
630 PM CST Fri Dec 10 2021

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Southeastern Cole County in central Missouri...
  Southwestern Montgomery County in east central Missouri...
  Southeastern Callaway County in central Missouri...
  Osage County in central Missouri...
  Northwestern Gasconade County in east central Missouri...

* Until 715 PM CST.
    
* At 630 PM CST, a severe thunderstorm capable of producing a tornado
  was located over Westphalia, moving northeast at 70 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Linn around 635 PM CST.
  Chamois around 645 PM CST.

Other locations in the path of this tornadic thunderstorm include
Hermann, Big Spring and New Florence.

This also includes Deutschheim Historic Site and Clarks Hill/Norton
Historic Site.
 
This includes Interstate 70 in Missouri near exit 175.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3831 9205 3846 9217 3900 9141 3860 9143
TIME...MOT...LOC 0030Z 232DEG 62KT 3847 9201 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Britt

3 follow-up statements

692 
WWUS53 KLSX 110040
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
640 PM CST Fri Dec 10 2021

MOC051-110050-
/O.CAN.KLSX.TO.W.0039.000000T0000Z-211211T0115Z/
Cole MO-
640 PM CST Fri Dec 10 2021

...THE TORNADO WARNING FOR SOUTHEASTERN COLE COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area.  Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1100 PM CST for central and
east central Missouri.

LAT...LON 3838 9190 3858 9199 3900 9141 3860 9143
TIME...MOT...LOC 0040Z 235DEG 55KT 3856 9183 

$$

MOC027-073-139-151-110115-
/O.CON.KLSX.TO.W.0039.000000T0000Z-211211T0115Z/
Montgomery MO-Callaway MO-Osage MO-Gasconade MO-
640 PM CST Fri Dec 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CST FOR
SOUTHWESTERN MONTGOMERY...SOUTHEASTERN CALLAWAY...NORTHEASTERN OSAGE
AND NORTHWESTERN GASCONADE COUNTIES...
    
At 640 PM CST, a severe thunderstorm capable of producing a tornado
was located near Linn, moving northeast at 65 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Chamois around 645 PM CST.

Other locations in the path of this tornadic thunderstorm include
Hermann and Big Spring.

This also includes Deutschheim Historic Site.
 
This includes Interstate 70 in Missouri near exit 175.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3838 9190 3858 9199 3900 9141 3860 9143
TIME...MOT...LOC 0040Z 235DEG 55KT 3856 9183 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Britt

073 
WWUS53 KLSX 110055
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
655 PM CST Fri Dec 10 2021

MOC027-151-110105-
/O.CAN.KLSX.TO.W.0039.000000T0000Z-211211T0115Z/
Callaway MO-Osage MO-
655 PM CST Fri Dec 10 2021

...THE TORNADO WARNING FOR SOUTHEASTERN CALLAWAY AND EASTERN OSAGE
COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has  moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1100 PM CST for central and
east central Missouri.

LAT...LON 3876 9165 3900 9141 3860 9143 3852 9164
TIME...MOT...LOC 0055Z 238DEG 71KT 3867 9155 

$$

MOC073-139-110115-
/O.CON.KLSX.TO.W.0039.000000T0000Z-211211T0115Z/
Montgomery MO-Gasconade MO-
655 PM CST Fri Dec 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CST FOR
SOUTHWESTERN MONTGOMERY AND NORTHWESTERN GASCONADE COUNTIES...
    
At 655 PM CST, a severe thunderstorm capable of producing a tornado
was located near Hermann, moving northeast at 80 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Hermann and Big Spring around 700 PM CST.

This also includes Deutschheim Historic Site.
 
This includes Interstate 70 in Missouri near exit 175.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3876 9165 3900 9141 3860 9143 3852 9164
TIME...MOT...LOC 0055Z 238DEG 71KT 3867 9155 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Britt

246 
WWUS53 KLSX 110112
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
712 PM CST Fri Dec 10 2021

MOC073-139-110122-
/O.EXP.KLSX.TO.W.0039.000000T0000Z-211211T0115Z/
Montgomery MO-Gasconade MO-
712 PM CST Fri Dec 10 2021

...THE TORNADO WARNING FOR SOUTHWESTERN MONTGOMERY AND NORTHWESTERN
GASCONADE COUNTIES WILL EXPIRE AT 715 PM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 1100 PM CST for central and
east central Missouri.

LAT...LON 3876 9165 3900 9141 3860 9143 3852 9164
TIME...MOT...LOC 0112Z 232DEG 62KT 3885 9126 

$$

Britt

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 10, 6:13 PM CST	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau	47 min
Dec 10, 6:18 PM CST	Severe Thunderstorm Warning	LSX	Cole, Osage	42 min
Dec 10, 6:27 PM CST	Tornado Warning	LSX	Audrain, Callaway	34 min
Dec 10, 6:42 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	48 min
Dec 10, 6:42 PM CST	Tornado Warning	LSX	Pike	48 min
Dec 10, 6:49 PM CST	Tornado Warning	LSX	Franklin, Gasconade, Osage, Warren	41 min
Dec 10, 6:50 PM CST	Tornado Warning	LSX	Audrain, Callaway, Montgomery, Pike, Ralls	40 min
Dec 10, 7:00 PM CST	Tornado Warning	LSX	Gasconade, Lincoln, Montgomery, Pike, Warren	45 min
Dec 10, 7:02 PM CST	Tornado Warning	LSX	Crawford, Franklin, Gasconade	43 min
Dec 10, 7:11 PM CST	Tornado Warning	LSX	Lincoln, Montgomery, Pike	49 min
Dec 10, 7:16 PM CST	Tornado Warning	LSX	Franklin, Lincoln, Saint Charles, Warren	44 min
Dec 10, 7:30 PM CST	Tornado Warning	LSX	Lincoln	45 min
Dec 10, 7:35 PM CST	Tornado Warning Tornado observed	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren	40 min
Dec 10, 7:49 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	26 min
Dec 10, 8:06 PM CST	Tornado Warning Tornado observed	LSX	Saint Charles, Saint Louis, City of Saint Louis	39 min
Dec 10, 8:10 PM CST	Severe Thunderstorm Warning	LSX	Franklin	35 min
Dec 10, 8:29 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, City of Saint Louis	30 min
Dec 10, 8:34 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	41 min
Dec 10, 8:47 PM CST	Tornado Warning	LSX	Franklin, Gasconade, Warren	43 min
Dec 10, 9:07 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more	38 min
Dec 10, 9:39 PM CST	Tornado Warning	LSX	Saint Charles, Saint Louis	51 min
Dec 10, 10:00 PM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	45 min
Dec 10, 10:05 PM CST	Severe Thunderstorm Warning	LSX	City of Saint Louis	25 min
Dec 10, 10:14 PM CST	Tornado Warning	LSX	Iron, Madison, Reynolds	46 min
Dec 10, 10:19 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois	41 min
Dec 10, 10:26 PM CST	Severe Thunderstorm Warning	LSX	Reynolds	20 min
Dec 10, 10:55 PM CST	Severe Thunderstorm Warning	LSX	Madison	18 min

Nearby

Tornado Warnings in Missouri, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.