Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 145, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 12, 2021, 5:27 PM CDT for Calhoun County, Greene County, Pike County, Illinois; 5 counties in Missouri. It was in force for 48 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
- Aug 12, 2021, 5:27 PM CDT (22:27 UTC)
- Expired
- Aug 12, 2021, 6:15 PM CDT
- In force
- 48 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Calhoun County, IL, Greene County, IL, Pike County, IL, Audrain County, MO, Lincoln County, MO, Montgomery County, MO, Pike County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 81 km from the middle of the area, began a volume at 22:30 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 |
|---|---|---|---|
| Aug 12, 5:48 PM CDT | TSTM WND DMG | 3 Nne Moscow Mills, MO | AT LEAST THREE POWER POLES SNAPPED ALONG HWY 47. |
| Aug 12, 5:48 PM CDT | TSTM WND DMG | Troy, MO | NUMEROUS TREES, TREE LIMBS AND POWER LINES BLOWN DOWN ACROSS THE NORTHERN HALF OF THE COUNTY. A LARGE TREE BRANCH WAS BLOWN ONTO A HOUSE. ALSO, A TRAMPOLINE AS BLOWN INTO THE SIDE OF A HOUSE BREAKING A WINDOW. |
| Aug 12, 5:48 PM CDT | TSTM WND DMG | Troy, MO | NUMEROUS TREES, TREE LIMBS AND POWER LINES BLOWN DOWN ACROSS THE NORTHERN HALF OF THE COUNTY. A LARGE TREE BRANCH WAS BLOWN ONTO A HOUSE. ALSO, A TRAMPOLINE WAS BLOWN INTO THE SIDE OF A HOUSE BREAKING A WINDOW. |
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 |
|---|---|---|---|
| Aug 12, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.5 hours before the alert went out and 224 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
- 1191 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 1149 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.1
The text
As transmitted.
004
WUUS53 KLSX 122227
SVRLSX
ILC013-061-149-MOC007-113-139-163-219-122315-
/O.NEW.KLSX.SV.W.0145.210812T2227Z-210812T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
527 PM CDT Thu Aug 12 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Northwestern Calhoun County in southwestern Illinois...
Northwestern Greene County in southwestern Illinois...
Southern Pike County in west central Illinois...
Lincoln County in east central Missouri...
East central Audrain County in central Missouri...
Northern Montgomery County in east central Missouri...
Northeastern Warren County in east central Missouri...
Pike County in northeastern Missouri...
* Until 615 PM CDT.
* At 526 PM CDT, severe thunderstorms were located along a line
extending from near Louisiana to near New Hartford to near
Wellsville, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...This line of storms has a history of wind damage.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Bowling Green and New Hartford around 530 PM CDT.
Louisiana around 535 PM CDT.
Atlas and Pike around 540 PM CDT.
Bellflower around 545 PM CDT.
Other locations in the path of these severe thunderstorms include
Clarksville, Pleasant Hill, Eolia, Hawk Point, Belleview and Davis.
This also includes Cuivre River State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3948 9043 3912 9066 3885 9100 3901 9163
3927 9138 3960 9120 3960 9118 3961 9119
3972 9113
TIME...MOT...LOC 2226Z 285DEG 30KT 3949 9115 3926 9130 3910 9151
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Elmore3 follow-up statements
372
WWUS53 KLSX 122243
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
543 PM CDT Thu Aug 12 2021
MOC007-122252-
/O.CAN.KLSX.SV.W.0145.000000T0000Z-210812T2315Z/
Audrain MO-
543 PM CDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL AUDRAIN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3948 9043 3912 9066 3885 9100 3899 9153
3924 9128 3956 9109 3970 9107
TIME...MOT...LOC 2242Z 270DEG 30KT 3946 9100 3923 9115 3907 9136
$$
ILC013-061-149-MOC113-139-163-219-122315-
/O.CON.KLSX.SV.W.0145.000000T0000Z-210812T2315Z/
Calhoun IL-Greene IL-Pike IL-Lincoln MO-Montgomery MO-Warren MO-
Pike MO-
543 PM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTHWESTERN CALHOUN AND NORTHWESTERN GREENE COUNTIES IN
SOUTHWESTERN ILLINOIS...SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL
ILLINOIS...LINCOLN...NORTHEASTERN MONTGOMERY...NORTHEASTERN WARREN
COUNTIES IN EAST CENTRAL MISSOURI AND EASTERN PIKE COUNTIES IN
NORTHEASTERN MISSOURI...
At 542 PM CDT, severe thunderstorms were located along a line
extending from Pike to 7 miles east of New Hartford to near
Bellflower, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...This storm has a history of wind damage.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Louisiana, Atlas, Clarksville, Pike, Pleasant Hill, Eolia, Hawk
Point, Belleview, Elsberry, Davis, Troy, Moscow Mills, Hardin and
Fountain N' Lakes.
This also includes Cuivre River State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3948 9043 3912 9066 3885 9100 3899 9153
3924 9128 3956 9109 3970 9107
TIME...MOT...LOC 2242Z 270DEG 30KT 3946 9100 3923 9115 3907 9136
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Elmore136
WWUS53 KLSX 122255
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
555 PM CDT Thu Aug 12 2021
MOC139-122304-
/O.CAN.KLSX.SV.W.0145.000000T0000Z-210812T2315Z/
Montgomery MO-
555 PM CDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MONTGOMERY COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3912 9066 3885 9100 3891 9123 3929 9099
3948 9088 3938 9049
TIME...MOT...LOC 2254Z 285DEG 30KT 3944 9090 3921 9105 3905 9126
$$
ILC013-061-149-MOC113-163-219-122315-
/O.CON.KLSX.SV.W.0145.000000T0000Z-210812T2315Z/
Calhoun IL-Greene IL-Pike IL-Lincoln MO-Warren MO-Pike MO-
555 PM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTHWESTERN CALHOUN AND WEST CENTRAL GREENE COUNTIES IN
SOUTHWESTERN ILLINOIS...SOUTH CENTRAL PIKE COUNTY IN WEST CENTRAL
ILLINOIS...LINCOLN...NORTHEASTERN WARREN COUNTIES IN EAST CENTRAL
MISSOURI AND SOUTHEASTERN PIKE COUNTIES IN NORTHEASTERN MISSOURI...
At 554 PM CDT, severe thunderstorms were located along a line
extending from Pleasant Hill to near Eolia to near Bellflower, moving
east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...This line of storms has a history of wind damage.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Troy, Elsberry, Moscow Mills, Davis, Hardin, Pleasant Hill, Hawk
Point, Eolia, Clarksville, Fountain N' Lakes, Belleview, Nebo,
Kampsville, Eldred, Silex, Hamburg, Paynesville, Whiteside, Annada
and Cave.
This also includes Cuivre River State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3912 9066 3885 9100 3891 9123 3929 9099
3948 9088 3938 9049
TIME...MOT...LOC 2254Z 285DEG 30KT 3944 9090 3921 9105 3905 9126
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Elmore254
WWUS53 KLSX 122313
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
613 PM CDT Thu Aug 12 2021
ILC013-061-149-MOC113-163-219-122323-
/O.EXP.KLSX.SV.W.0145.000000T0000Z-210812T2315Z/
Calhoun IL-Greene IL-Pike IL-Lincoln MO-Warren MO-Pike MO-
613 PM CDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CALHOUN AND WEST
CENTRAL GREENE COUNTIES IN SOUTHWESTERN ILLINOIS...SOUTH CENTRAL PIKE
COUNTY IN WEST CENTRAL ILLINOIS...LINCOLN...NORTHEASTERN WARREN
COUNTIES IN EAST CENTRAL MISSOURI AND SOUTHEASTERN PIKE COUNTIES IN
NORTHEASTERN MISSOURI WILL EXPIRE AT 615 PM CDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3912 9066 3885 9100 3891 9123 3929 9099
3948 9088 3938 9049
TIME...MOT...LOC 2313Z 270DEG 30KT 3940 9072 3917 9087 3901 9108
$$
ElmoreThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 4:45 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 45 min |
| Aug 12, 4:50 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 40 min |
| Aug 12, 4:56 PM CDT | Areal Flood Advisory | LSX | Adams | 4 hr |
| Aug 12, 5:28 PM CDT | Areal Flood Advisory | LSX | Bond, Madison | 4 hr |
| Aug 12, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 54 min |
| Aug 12, 6:37 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison, Monroe, Saint Clair, Washington | 53 min |
| Aug 12, 3:58 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Monroe, Shelby | 62 min |
| Aug 12, 6:41 PM CDT | Areal Flood Advisory | LSX | Lincoln, Saint Charles, Saint Louis | 4 hr |
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.