Alert archive / Missouri / Tornado Warnings in 2021

Tornado Warning 55, NWS St. Louis, MO

December 10, 2021Franklin County, Gasconade County, Warren County, Missouri

NWS St. Louis, MO issued this tornado warning at Dec 10, 2021, 8:47 PM CST for Franklin County, Gasconade County, Warren County, Missouri. It was in force for 43 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, 8:47 PM CST (02:47 UTC)
Expired: Dec 10, 2021, 9:30 PM CST
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Franklin County, MO, Gasconade County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 02:50 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, 9:09 PM CST	TSTM WND DMG	5 Sw Union, MO	FRANKLIN COUNTY DISPATCH REPORTED TREES AND POWER LINES WERE DOWN ALONG CAMP MO-VAL ROAD WSW OF UNION. TIME ESTIMATED FROM RADAR.
Dec 10, 9:09 PM CST	TSTM WND DMG	Gerald, MO	FRANKLIN COUNTY DISPATCH REPORTED PHONE LINES DOWN IN GERALD ACROSS WEST 6TH STREET. TIME ESTIMATED FROM RADAR.
Dec 10, 9:13 PM CST	TSTM WND DMG	2 Ssw Union, MO	FRANKLIN COUNTY DISPATCH REPORTED TREES DOWN ACROSS NORTH BEND LOOP SW OF UNION. TIME ESTIMATED FROM RADAR.
Dec 10, 9:14 PM CST	HAIL 0.25	3 W Union, MO	REPORT OF PEA SIZED HAIL JUST WEST OF UNION, MO.
Dec 10, 9:30 PM CST	TSTM WND DMG	3 Wnw Robertsville, MO	FRANKLIN COUNTY DISPATCH REPORTED A TREE OVER THE ROADWAY AT STATE HWY O AND ROUTE MM. 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, 2.8 hours before the alert went out and 268 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.

379 
WFUS53 KLSX 110247
TORLSX
MOC071-073-219-110330-
/O.NEW.KLSX.TO.W.0055.211211T0247Z-211211T0330Z/

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

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Franklin County in east central Missouri...
  Southeastern Warren County in east central Missouri...
  Southern Gasconade County in east central Missouri...

* Until 930 PM CST.
    
* At 846 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Owensville, moving northeast at 75 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...
  Rosebud around 855 PM CST.
  Gerald around 900 PM CST.
  Beaufort around 905 PM CST.

Other locations in the path of this tornadic thunderstorm include
Union, Washington and Villa Ridge.

This includes Interstate 44 in Missouri between exits 240 and 247.
 
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 3872 9110 3841 9085 3821 9137 3821 9153
      3819 9153 3819 9160 3823 9165 3831 9165
TIME...MOT...LOC 0246Z 239DEG 64KT 3826 9152 

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

$$

Britt

3 follow-up statements

481 
WWUS53 KLSX 110257
SVSLSX

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

MOC071-073-219-110330-
/O.CON.KLSX.TO.W.0055.000000T0000Z-211211T0330Z/
Franklin MO-Warren MO-Gasconade MO-
857 PM CST Fri Dec 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CST FOR
FRANKLIN...SOUTHEASTERN WARREN AND SOUTHEASTERN GASCONADE COUNTIES...
    
At 857 PM CST, severe thunderstorms capable of producing tornadoes
were located along a line extending from near New Haven to near
Beaufort to near Rosebud, moving northeast at 75 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.

These dangerous storms will be near...
  New Haven and Treloar around 900 PM CST.
  Washington, Marthasville and Beaufort around 905 PM CST.

Other locations in the path of these tornadic storms include St.
Clair, Union and Villa Ridge.

This includes Interstate 44 in Missouri between exits 240 and 247.
 
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 3872 9110 3841 9085 3821 9137 3821 9153
      3829 9150 3835 9148 3849 9141
TIME...MOT...LOC 0257Z 246DEG 65KT 3856 9126 3849 9123 3832 9135 

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

$$

Britt

509 
WWUS53 KLSX 110311
SVSLSX

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

MOC073-110321-
/O.CAN.KLSX.TO.W.0055.000000T0000Z-211211T0330Z/
Gasconade MO-
911 PM CST Fri Dec 10 2021

...THE TORNADO WARNING FOR SOUTHEASTERN GASCONADE 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 east central
Missouri.

LAT...LON 3863 9103 3841 9085 3825 9127 3836 9120
      3848 9118
TIME...MOT...LOC 0311Z 245DEG 69KT 3843 9103 

$$

MOC071-219-110330-
/O.CON.KLSX.TO.W.0055.000000T0000Z-211211T0330Z/
Franklin MO-Warren MO-
911 PM CST Fri Dec 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CST FOR CENTRAL
FRANKLIN AND SOUTHEASTERN WARREN COUNTIES...
    
At 911 PM CST, a severe thunderstorm capable of producing a tornado
was located over Union, 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.

Locations impacted include...
  Villa Ridge.

This includes Interstate 44 in Missouri between exits 240 and 247.
 
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 3863 9103 3841 9085 3825 9127 3836 9120
      3848 9118
TIME...MOT...LOC 0311Z 245DEG 69KT 3843 9103 

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

$$

Britt

600 
WWUS53 KLSX 110323
SVSLSX

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

MOC071-219-110332-
/O.EXP.KLSX.TO.W.0055.000000T0000Z-211211T0330Z/
Franklin MO-Warren MO-
923 PM CST Fri Dec 10 2021

...THE TORNADO WARNING FOR CENTRAL FRANKLIN AND SOUTHEASTERN WARREN
COUNTIES WILL EXPIRE AT 930 PM CST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

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

LAT...LON 3863 9103 3841 9085 3825 9127 3836 9120
      3848 9118
TIME...MOT...LOC 0322Z 239DEG 64KT 3853 9081 

$$

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, 6:30 PM CST	Tornado Warning	LSX	Callaway, Cole, Gasconade, Montgomery, Osage	45 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, 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.