Alert archive / Missouri / Tornado Warnings in 2021

Tornado Warning 10, NWS St. Louis, MO

June 20, 2021Marion County, Shelby County, Missouri

NWS St. Louis, MO issued this tornado warning at Jun 20, 2021, 9:07 PM CDT for Marion County, Shelby County, Missouri. It was in force for 38 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: Jun 20, 2021, 9:07 PM CDT (02:07 UTC)
Expired: Jun 20, 2021, 9:45 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Marion County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 167 km from the middle of the area, began a volume at 02:09 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
Jun 20, 9:15 PM CDT	TSTM WND DMG	Shelbyville, MO	TREES CAME DOWN ON A HOUSE AND VEHICLE. TIME ESTIMATED FROM RADAR.
Jun 20, 9:15 PM CDT	TSTM WND GST 66	1 Nne Bethel, MO	VIA FACEBOOK.
Jun 20, 9:20 PM CDT	TSTM WND DMG	2 S Shelbyville, MO	TREES DOWN OVER HIGHWAY 15 SOUTH OF SHELBYVILLE.

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
Jun 20, 8:10 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.1 hours before the alert went out and 234 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: 1058 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.8

Open this sounding in Storm Lab

The text

As transmitted.

537 
WFUS53 KLSX 210207
TORLSX
MOC127-205-210245-
/O.NEW.KLSX.TO.W.0010.210621T0207Z-210621T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
907 PM CDT Sun Jun 20 2021

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Western Marion County in northeastern Missouri...
  Shelby County in northeastern Missouri...

* Until 945 PM CDT.
    
* At 906 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Shelbyville, moving southeast at 45 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Shelbyville around 910 PM CDT.
  Emden around 925 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Warren and Philadelphia.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 3995 9199 3987 9160 3966 9177 3966 9196
      3978 9226 3996 9215
TIME...MOT...LOC 0206Z 294DEG 40KT 3988 9209 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

19

3 follow-up statements

067 
WWUS53 KLSX 210219
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
919 PM CDT Sun Jun 20 2021

MOC127-205-210245-
/O.CON.KLSX.TO.W.0010.000000T0000Z-210621T0245Z/
Marion MO-Shelby MO-
919 PM CDT Sun Jun 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR WESTERN
MARION AND EASTERN SHELBY COUNTIES...
    
At 919 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Emden, moving east at 50 mph.

HAZARD...Tornado and quarter size hail.

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...
  Warren and Philadelphia.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 3995 9199 3987 9160 3966 9177 3967 9193
      3978 9216 3994 9210
TIME...MOT...LOC 0219Z 282DEG 42KT 3985 9194 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

19

328 
WWUS53 KLSX 210231
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
931 PM CDT Sun Jun 20 2021

MOC127-205-210245-
/O.CON.KLSX.TO.W.0010.000000T0000Z-210621T0245Z/
Marion MO-Shelby MO-
931 PM CDT Sun Jun 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR WESTERN
MARION AND EASTERN SHELBY COUNTIES...
    
At 931 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Emden, moving east at 30 mph.

HAZARD...Tornado and quarter size hail.

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...
Warren, Emden, Philadelphia and Hunnewell. 

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 3994 9195 3987 9160 3966 9177 3967 9193
      3973 9205 3988 9199
TIME...MOT...LOC 0231Z 290DEG 25KT 3983 9187 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

19

850 
WWUS53 KLSX 210245
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
945 PM CDT Sun Jun 20 2021

MOC127-205-210254-
/O.EXP.KLSX.TO.W.0010.000000T0000Z-210621T0245Z/
Marion MO-Shelby MO-
945 PM CDT Sun Jun 20 2021

...THE TORNADO WARNING FOR WESTERN MARION AND EASTERN SHELBY COUNTIES
WILL EXPIRE AT 945 PM CDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.  However
gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
northeastern Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect for
eastern Shelby and western Marion Counties.

LAT...LON 3994 9195 3987 9160 3966 9177 3967 9193
      3973 9205 3988 9199
TIME...MOT...LOC 0244Z 294DEG 40KT 3978 9172 

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:41 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Shelby	49 min
Jun 20, 9:17 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Marion, Monroe, Ralls, Shelby	43 min
Jun 20, 9:42 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Monroe	48 min
Jun 20, 9:59 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Pike, Ralls	46 min
Jun 20, 10:10 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Monroe, Montgomery, Pike, Ralls	50 min
Jun 20, 10:22 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	38 min
Jun 20, 10:27 PM CDT	Areal Flood Advisory	LSX	Audrain, Boone, Monroe	3 hr
Jun 20, 10:42 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau	48 min
Jun 20, 10:55 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Montgomery	35 min
Jun 20, 11:29 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Franklin, Gasconade, Lincoln and 3 more	31 min
Jun 20, 11:41 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles	19 min
Jun 20, 11:59 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Osage, Warren	31 min
Jun 21, 12:34 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau	26 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.