Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 80, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2021, 8:41 PM CDT for Knox County, Lewis County, Shelby County, Missouri. It was in force for 49 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
- Jun 20, 2021, 8:41 PM CDT (01:41 UTC)
- Expired
- Jun 20, 2021, 9:30 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Knox County, MO, Lewis County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 176 km from the middle of the area, began a volume at 01:41 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. |
| Jun 20, 9:20 PM CDT | TSTM WND DMG | 4 Ene Maud, MO | A BARN ROOF WAS TORN OFF AND THE BARN DOOR WAS BLOWN A QUARTER OF A MILE TO THE SOUTH (INTO MONROE COUNTY). ALSO, AN EMPTY SEMI TRAILER WAS BLOWN OVER ON TOP OF A PICKUP TRUCK. THE HOUSE LOST A NUMBER OF SHINGLES. |
| Jun 20, 9:24 PM CDT | TSTM WND DMG | Lewistown, MO | SIX INCH DIAMETER TREE LIMBS DOWNED. 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 |
|---|---|---|---|
| Jun 20, 8:10 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.7 hours before the alert went out and 232 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
- 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
The text
As transmitted.
622
WUUS53 KLSX 210141
SVRLSX
MOC103-111-205-210230-
/O.NEW.KLSX.SV.W.0080.210621T0141Z-210621T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
841 PM CDT Sun Jun 20 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Knox County in northeastern Missouri...
Shelby County in northeastern Missouri...
Southwestern Lewis County in northeastern Missouri...
* Until 930 PM CDT.
* At 840 PM CDT, severe thunderstorms were located along a line
extending from near Edina to 6 miles south of Marceline, moving
southeast at 45 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters. At 8:32 pm, a 71 mph wind gust
was measured at Kirksville Regional Airport.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Severe thunderstorms will be near...
Edina around 845 PM CDT.
Knox City around 850 PM CDT.
La Belle around 900 PM CDT.
Other locations in the path of these severe thunderstorms include
Lewistown and Ewing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4009 9162 3995 9179 3995 9184 3990 9184
3966 9211 3966 9219 3960 9219 3961 9230
3995 9229 3996 9234 4021 9235
TIME...MOT...LOC 0140Z 293DEG 38KT 4021 9211 3962 9293
HAIL...1.00IN
WIND...70MPH
$$
192 follow-up statements
210
WWUS53 KLSX 210154
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
854 PM CDT Sun Jun 20 2021
MOC103-111-205-210230-
/O.CON.KLSX.SV.W.0080.000000T0000Z-210621T0230Z/
Knox MO-Shelby MO-Lewis MO-
854 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR SOUTHEASTERN KNOX...SHELBY AND SOUTHWESTERN LEWIS COUNTIES...
At 854 PM CDT, severe thunderstorms were located along a line
extending from La Belle to 9 miles northeast of Salisbury, moving
east at 50 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters. At 8:32 pm, a 71 mph wind gust
was measured at Kirksville Regional Airport.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
These severe storms will be near...
La Belle and Lewistown around 900 PM CDT.
Other locations in the path of these severe thunderstorms include
Ewing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3991 9229 4014 9195 4009 9162 3995 9179
3995 9184 3990 9184 3966 9211 3966 9219
3960 9219 3961 9230
TIME...MOT...LOC 0154Z 288DEG 44KT 4013 9191 3955 9273
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
19409
WWUS53 KLSX 210204
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
904 PM CDT Sun Jun 20 2021
MOC103-111-205-210230-
/O.CON.KLSX.SV.W.0080.000000T0000Z-210621T0230Z/
Knox MO-Shelby MO-Lewis MO-
904 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR SOUTHEASTERN KNOX...SHELBY AND SOUTHWESTERN LEWIS COUNTIES...
At 903 PM CDT, severe thunderstorms were located along a line
extending from near Lewistown to near Huntsville, moving east at 50
mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
These severe thunderstorms will remain over mainly rural areas of
southeastern Knox, Shelby and southwestern Lewis Counties, including
the following locations... Leonard, Newark and Bethel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4008 9204 4000 9173 3995 9179 3995 9184
3990 9184 3966 9211 3966 9219 3960 9219
3961 9230 3991 9229
TIME...MOT...LOC 0203Z 288DEG 43KT 4009 9176 3951 9258
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 9:07 PM CDT | Tornado Warning | LSX | Marion, Shelby | 38 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
Severe Thunderstorm Warnings in Missouri, 2021Every severe thunderstorm warning 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.