Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 83, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2021, 9:59 PM CDT for 4 counties in Missouri; Pike County, Illinois. It was in force for 46 min. 1 report 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, 9:59 PM CDT (02:59 UTC)
- Expired
- Jun 20, 2021, 10:45 PM CDT
- In force
- 46 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Pike County, IL, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO
The radar
The St Louis radar (KLSX), 109 km from the middle of the area, began a volume at 03:03 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, 10:10 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, 3.0 hours before the alert went out and 244 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.
736
WUUS53 KLSX 210259
SVRLSX
ILC149-MOC127-137-163-173-210345-
/O.NEW.KLSX.SV.W.0083.210621T0259Z-210621T0345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
959 PM CDT Sun Jun 20 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southwestern Pike County in west central Illinois...
Ralls County in northeastern Missouri...
South central Marion County in northeastern Missouri...
Eastern Monroe County in northeastern Missouri...
Northwestern Pike County in northeastern Missouri...
* Until 1045 PM CDT.
* At 959 PM CDT, severe thunderstorms were located along a line
extending from 8 miles southeast of Hannibal to near Perry, moving
east at 60 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...
Spencerburg around 1015 PM CDT.
Other locations in the path of these severe thunderstorms include
Curryville, Bowling Green and Tarrants.
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 3959 9093 3927 9118 3944 9210 3974 9166
TIME...MOT...LOC 0259Z 282DEG 50KT 3965 9124 3938 9170
HAIL...1.00IN
WIND...70MPH
$$
192 follow-up statements
139
WWUS53 KLSX 210316
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1016 PM CDT Sun Jun 20 2021
MOC127-210326-
/O.CAN.KLSX.SV.W.0083.000000T0000Z-210621T0345Z/
Marion MO-
1016 PM CDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MARION COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
west central Illinois...and northeastern Missouri.
LAT...LON 3959 9093 3927 9118 3942 9197 3969 9141
TIME...MOT...LOC 0316Z 270DEG 50KT 3961 9095 3934 9141
$$
ILC149-MOC137-163-173-210345-
/O.CON.KLSX.SV.W.0083.000000T0000Z-210621T0345Z/
Pike IL-Ralls MO-Monroe MO-Pike MO-
1016 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR SOUTHWESTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...RALLS...
SOUTHEASTERN MONROE AND NORTHWESTERN PIKE COUNTIES IN NORTHEASTERN
MISSOURI...
At 1016 PM CDT, severe thunderstorms were located along a line
extending from 6 miles north of Atlas to near Curryville, moving east
at 60 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...
Tarrants.
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 3959 9093 3927 9118 3942 9197 3969 9141
TIME...MOT...LOC 0316Z 270DEG 50KT 3961 9095 3934 9141
HAIL...1.00IN
WIND...70MPH
$$
19702
WWUS53 KLSX 210329
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1029 PM CDT Sun Jun 20 2021
MOC137-210339-
/O.CAN.KLSX.SV.W.0083.000000T0000Z-210621T0345Z/
Monroe MO-
1029 PM CDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
west central Illinois...and central and northeastern Missouri.
LAT...LON 3959 9093 3927 9118 3937 9172 3965 9122
TIME...MOT...LOC 0329Z 282DEG 50KT 3958 9074 3931 9120
$$
ILC149-MOC163-173-210345-
/O.CON.KLSX.SV.W.0083.000000T0000Z-210621T0345Z/
Pike IL-Ralls MO-Pike MO-
1029 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR SOUTHWESTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...SOUTHERN
RALLS AND NORTHWESTERN PIKE COUNTIES IN NORTHEASTERN MISSOURI...
At 1029 PM CDT, severe thunderstorms were located along a line
extending from near Pittsfield to near Bowling Green, moving east at
60 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...
Bowling Green, Louisiana, Frankford, Pike, Curryville, Tarrants,
Spencerburg, St. Clement, Rockport and Ashburn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3959 9093 3927 9118 3937 9172 3965 9122
TIME...MOT...LOC 0329Z 282DEG 50KT 3958 9074 3931 9120
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, 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.