Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 81, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2021, 9:17 PM CDT for Adams County, Illinois; 6 counties in Missouri. It was in force for 43 min. 7 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, 9:17 PM CDT (02:17 UTC)
- Expired
- Jun 20, 2021, 10:00 PM CDT
- In force
- 43 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Adams County, IL, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Ralls County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 153 km from the middle of the area, began a volume at 02:18 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, 9:20 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 | 3 Sw Shelbina, MO | MAJOR ROOF DAMAGE TO A BARN ON THE NORTH SIDE OF HIGHWAY WW NEAR INTERSECTION WITH SHELBY CO. ROAD 425. |
| 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. |
| Jun 20, 9:44 PM CDT | TSTM WND DMG | Monroe City, MO | SEMI TRUCK WAS BLOWN OVER AND MOVED 20 FEET AT BUSINESS ON THE WEST SIDE OF TOWN. |
| Jun 20, 9:44 PM CDT | TSTM WND DMG | Monroe City, MO | TREES DOWN IN MONROE CITY. |
| Jun 20, 10:10 PM CDT | TSTM WND DMG | Perry, MO | SEVERAL LARGE TREE LIMBS WERE BLOWN DOWN AROUND TOWN. |
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, 2.3 hours before the alert went out and 231 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.
571
WUUS53 KLSX 210217
SVRLSX
ILC001-MOC103-111-127-137-173-205-210300-
/O.NEW.KLSX.SV.W.0081.210621T0217Z-210621T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
917 PM CDT Sun Jun 20 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southwestern Adams County in west central Illinois...
Southeastern Knox County in northeastern Missouri...
Western Ralls County in northeastern Missouri...
Marion County in northeastern Missouri...
Shelby County in northeastern Missouri...
Southern Lewis County in northeastern Missouri...
Monroe County in northeastern Missouri...
* Until 1000 PM CDT.
* At 917 PM CDT, severe thunderstorms were located along a line
extending from near Ewing to near Paris, 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.
* Severe thunderstorms will be near...
Lewistown and Ewing around 920 PM CDT.
Maywood around 930 PM CDT.
La Grange around 935 PM CDT.
Other locations in the path of these severe thunderstorms include
Quincy, Perry and Center.
This includes Interstate 172 between exits 10 and 19.
This also includes Wakonda State Park and Mark Twain Lake
Recreational Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4006 9121 3935 9162 3948 9231 3962 9230
4013 9198
TIME...MOT...LOC 0217Z 275DEG 42KT 4002 9179 3950 9208
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
192 follow-up statements
533
WWUS53 KLSX 210235
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
935 PM CDT Sun Jun 20 2021
ILC001-MOC103-111-210244-
/O.CAN.KLSX.SV.W.0081.000000T0000Z-210621T0300Z/
Adams IL-Knox MO-Lewis MO-
935 PM CDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ADAMS...
SOUTHEASTERN KNOX AND SOUTHERN LEWIS COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened. Therefore, the
warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
west central Illinois...and northeastern Missouri.
LAT...LON 3995 9198 3985 9144 3980 9137 3935 9162
3948 9231 3962 9230 3995 9209
TIME...MOT...LOC 0234Z 284DEG 25KT 3969 9169 3947 9218
$$
MOC127-137-173-205-210300-
/O.CON.KLSX.SV.W.0081.000000T0000Z-210621T0300Z/
Ralls MO-Marion MO-Shelby MO-Monroe MO-
935 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR WESTERN RALLS...MARION...SHELBY AND MONROE COUNTIES...
At 934 PM CDT, severe thunderstorms were located along a line
extending from near Monroe City to Madison, moving east at 30 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.
Locations impacted include...
Monroe City, Rensselaer, Spaulding and Hannibal.
This also includes Mark Twain Lake Recreational Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3995 9198 3985 9144 3980 9137 3935 9162
3948 9231 3962 9230 3995 9209
TIME...MOT...LOC 0234Z 284DEG 25KT 3969 9169 3947 9218
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
19795
WWUS53 KLSX 210247
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
947 PM CDT Sun Jun 20 2021
MOC127-137-173-205-210300-
/O.CON.KLSX.SV.W.0081.000000T0000Z-210621T0300Z/
Ralls MO-Marion MO-Shelby MO-Monroe MO-
947 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR WESTERN RALLS...MARION...SOUTHEASTERN SHELBY AND MONROE
COUNTIES...
At 946 PM CDT, severe thunderstorms were located along a line
extending from Rensselaer to Paris, moving east at 50 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Hannibal, Palmyra, Monroe City, Shelbina, Paris, Warren, Perry,
Madison, Center, Rensselaer, Spaulding, Maud, Woodlawn, Granville,
Philadelphia, Hunnewell, Holliday, Stoutsville, The Landing and
Florida.
This also includes Mark Twain Lake Recreational Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3985 9144 3980 9137 3935 9162 3948 9231
3961 9229 3974 9195 3989 9168
TIME...MOT...LOC 0246Z 275DEG 42KT 3968 9152 3946 9201
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 9:59 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 46 min |
| Jun 20, 8:41 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis, Shelby | 49 min |
| Jun 20, 9:07 PM CDT | Tornado Warning | LSX | Marion, Shelby | 38 min |
| Jun 20, 9:42 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Monroe | 48 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, 2021Severe Thunderstorm Warnings in Illinois, 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.