Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 84, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2021, 10:10 PM CDT for 6 counties in Missouri. It was in force for 50 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, 10:10 PM CDT (03:10 UTC)
- Expired
- Jun 20, 2021, 11:00 PM CDT
- In force
- 50 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Audrain County, MO, Boone County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO
The radar
The St Louis radar (KLSX), 105 km from the middle of the area, began a volume at 03:13 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, 10:11 PM CDT | TSTM WND DMG | 1 Nw Mexico, MO | LARGE TREE DOWN ACROSS JACKSON STREET IN CENTRAL MEXICO. |
| Jun 20, 10:11 PM CDT | TSTM WND DMG | Mexico, MO | NUMEROUS TREE LIMBS DOWN IN/AROUND MEXICO. ONE LARGE LIMB FELL ON A PARKED CAR IN 800 BLOCK OF EAST JACKSON. METAL STORAGE SHED BLOWN ONTO NEARBY ROADWAY NEAR HOLT STREET AND MARTIN LUTHER KING DRIVE. |
| Jun 20, 10:22 PM CDT | TSTM WND DMG | Laddonia, MO | LARGE TREE (GREATER THAN TWO FT DIA) BROKEN INTO POWER LINES. |
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
Lincoln, IL (KILX), launched 00:00Z, 3.2 hours before the alert went out and 289 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
- 1632 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1351 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 421 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 13.7
The text
As transmitted.
438
WUUS53 KLSX 210310
SVRLSX
MOC007-019-137-139-163-173-210400-
/O.NEW.KLSX.SV.W.0084.210621T0310Z-210621T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1010 PM CDT Sun Jun 20 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southwestern Ralls County in northeastern Missouri...
Northeastern Boone County in central Missouri...
Audrain County in central Missouri...
Northern Montgomery County in east central Missouri...
Southeastern Monroe County in northeastern Missouri...
Southwestern Pike County in northeastern Missouri...
* Until 1100 PM CDT.
* At 1010 PM CDT, severe thunderstorms were located along a line
extending from Vandalia to near Mexico, 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...
Vandalia and Farber around 1015 PM CDT.
Martinsburg and New Hartford around 1025 PM CDT.
Wellsville around 1030 PM CDT.
Other locations in the path of these severe thunderstorms include
Buell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3942 9198 3927 9115 3900 9138 3903 9164
3906 9164 3906 9186 3912 9224
TIME...MOT...LOC 0310Z 288DEG 45KT 3932 9150 3914 9189
HAIL...1.00IN
WIND...70MPH
$$
191 follow-up statement
944
WWUS53 KLSX 210336
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1036 PM CDT Sun Jun 20 2021
MOC137-210345-
/O.CAN.KLSX.SV.W.0084.000000T0000Z-210621T0400Z/
Monroe MO-
1036 PM CDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
central, northeastern and east central Missouri.
LAT...LON 3924 9214 3934 9182 3934 9172 3937 9172
3927 9115 3900 9138 3903 9164 3906 9164
3906 9186 3912 9224
TIME...MOT...LOC 0335Z 288DEG 45KT 3922 9112 3904 9151
$$
MOC007-019-139-163-173-210400-
/O.CON.KLSX.SV.W.0084.000000T0000Z-210621T0400Z/
Ralls MO-Boone MO-Audrain MO-Montgomery MO-Pike MO-
1036 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR SOUTHWESTERN RALLS COUNTY IN NORTHEASTERN MISSOURI...NORTHEASTERN
BOONE AND AUDRAIN COUNTIES IN CENTRAL MISSOURI...NORTHERN MONTGOMERY
COUNTY IN EAST CENTRAL MISSOURI AND SOUTHWESTERN PIKE COUNTIES IN
NORTHEASTERN MISSOURI...
At 1035 PM CDT, severe thunderstorms were located along a line
extending from near Eolia to near Buell, 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
southwestern Ralls County in northeastern Missouri, northeastern
Boone and Audrain Counties in central Missouri, northern Montgomery
County in east central Missouri and southwestern Pike Counties in
northeastern Missouri, including the following locations... Benton
City, Middletown, Vandiver, Ashley, Thompson and Rush Hill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3924 9214 3934 9182 3934 9172 3937 9172
3927 9115 3900 9138 3903 9164 3906 9164
3906 9186 3912 9224
TIME...MOT...LOC 0335Z 288DEG 45KT 3922 9112 3904 9151
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, 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, 9:17 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, 10:22 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.