Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 144, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 12, 2021, 4:50 PM CDT for 7 counties in Missouri; Pike County, Illinois. It was in force for 40 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, 4:50 PM CDT (21:50 UTC)
- Expired
- Aug 12, 2021, 5:30 PM CDT
- In force
- 40 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Pike County, IL, Audrain County, MO, Callaway County, MO, Lincoln County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO
The radar
The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 21:50 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, 4:55 PM CDT | TSTM WND DMG | 5 N Auxvasse, MO | MULTIPLE 5 INCH DIAMETER TREE LIMBS DOWNED. |
| Aug 12, 4:55 PM CDT | TSTM WND GST 61 | 1 E Vandiver, MO | MEASURED KMYJ AWOS. |
| Aug 12, 4:55 PM CDT | TSTM WND GST 61 | 2 E Vandiver, MO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.8 hours before the alert went out and 263 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.
283
WUUS53 KLSX 122150
SVRLSX
ILC149-MOC007-027-113-137-139-163-173-122230-
/O.NEW.KLSX.SV.W.0144.210812T2150Z-210812T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
450 PM CDT Thu Aug 12 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
South central Pike County in west central Illinois...
Southwestern Ralls County in northeastern Missouri...
Northwestern Lincoln County in east central Missouri...
Eastern Audrain County in central Missouri...
Northern Montgomery County in east central Missouri...
Northeastern Callaway County in central Missouri...
Southeastern Monroe County in northeastern Missouri...
Pike County in northeastern Missouri...
* Until 530 PM CDT.
* At 450 PM CDT, severe thunderstorms were located along a line
extending from 7 miles northwest of Perry to near Santa Fe to near
Mexico, moving east at 45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Perry around 455 PM CDT.
Laddonia around 500 PM CDT.
Center and Farber around 505 PM CDT.
Vandalia and Martinsburg around 510 PM CDT.
Other locations in the path of these severe thunderstorms include
Wellsville, Frankford, Curryville, Spencerburg, Montgomery City,
Buell, New Hartford, Bowling Green, Bellflower 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 3932 9178 3963 9176 3951 9152 3952 9092
3919 9096 3899 9120 3899 9126 3894 9126
3893 9127 3908 9199
TIME...MOT...LOC 2150Z 281DEG 38KT 3952 9175 3933 9177 3915 9192
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Elmore2 follow-up statements
172
WWUS53 KLSX 122202
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
502 PM CDT Thu Aug 12 2021
ILC149-MOC007-027-113-137-139-163-173-122230-
/O.CON.KLSX.SV.W.0144.000000T0000Z-210812T2230Z/
Pike IL-Ralls MO-Lincoln MO-Audrain MO-Montgomery MO-Callaway MO-
Monroe MO-Pike MO-
502 PM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR SOUTH CENTRAL PIKE COUNTY IN WEST CENTRAL ILLINOIS...SOUTHWESTERN
RALLS COUNTY IN NORTHEASTERN MISSOURI...NORTHWESTERN LINCOLN COUNTY
IN EAST CENTRAL MISSOURI...EASTERN AUDRAIN COUNTY IN CENTRAL
MISSOURI...NORTHERN MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...
NORTHEASTERN CALLAWAY COUNTY IN CENTRAL MISSOURI...SOUTHEASTERN
MONROE AND PIKE COUNTIES IN NORTHEASTERN MISSOURI...
At 501 PM CDT, severe thunderstorms were located along a line
extending from near Center to near Farber to near Mexico, moving east
at 45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Mexico AWOS reported 62 mph winds with these storms.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Center and Farber around 505 PM CDT.
Vandalia and Martinsburg around 510 PM CDT.
Other locations in the path of these severe thunderstorms include
Wellsville, Curryville, Spencerburg, Montgomery City, Frankford,
Buell, New Hartford, Bowling Green, Bellflower, Tarrants, Louisiana,
Eolia and Pike.
This also includes Mark Twain Lake Recreational Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3932 9178 3963 9176 3951 9152 3952 9092
3919 9096 3899 9120 3899 9126 3894 9126
3893 9127 3908 9199
TIME...MOT...LOC 2201Z 281DEG 38KT 3950 9162 3931 9164 3913 9179
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Elmore418
WWUS53 KLSX 122214
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
514 PM CDT Thu Aug 12 2021
MOC137-122223-
/O.CAN.KLSX.SV.W.0144.000000T0000Z-210812T2230Z/
Monroe MO-
514 PM CDT Thu Aug 12 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.
LAT...LON 3931 9169 3957 9164 3951 9152 3952 9092
3919 9096 3899 9120 3899 9126 3894 9126
3893 9127 3904 9179
TIME...MOT...LOC 2213Z 270DEG 38KT 3948 9150 3929 9152 3911 9167
$$
ILC149-MOC007-027-113-139-163-173-122230-
/O.CON.KLSX.SV.W.0144.000000T0000Z-210812T2230Z/
Pike IL-Ralls MO-Lincoln MO-Audrain MO-Montgomery MO-Callaway MO-
Pike MO-
514 PM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR SOUTH CENTRAL PIKE COUNTY IN WEST CENTRAL ILLINOIS...SOUTHWESTERN
RALLS COUNTY IN NORTHEASTERN MISSOURI...NORTHWESTERN LINCOLN COUNTY
IN EAST CENTRAL MISSOURI...EASTERN AUDRAIN COUNTY IN CENTRAL
MISSOURI...NORTHERN MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...
NORTHEASTERN CALLAWAY COUNTY IN CENTRAL MISSOURI AND PIKE COUNTIES IN
NORTHEASTERN MISSOURI...
At 513 PM CDT, severe thunderstorms were located along a line
extending from near Center to Vandalia to Martinsburg, moving east at
45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Mexico AWOS reported a 62 mph wind gust.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Spencerburg around 520 PM CDT.
Other locations in the path of these severe thunderstorms include
Frankford, Curryville, Buell, Bowling Green, Bellflower, Tarrants,
New Hartford, Louisiana, Pike, Atlas and Eolia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3931 9169 3957 9164 3951 9152 3952 9092
3919 9096 3899 9120 3899 9126 3894 9126
3893 9127 3904 9179
TIME...MOT...LOC 2213Z 270DEG 38KT 3948 9150 3929 9152 3911 9167
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
ElmoreThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 3:58 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Monroe, Shelby | 62 min |
| Aug 12, 4:45 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Pike, Ralls | 45 min |
| Aug 12, 4:56 PM CDT | Areal Flood Advisory | LSX | Lewis, Marion | 4 hr |
| Aug 12, 5:27 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Lincoln, Montgomery, Pike, Warren | 48 min |
| Aug 12, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Jefferson, Lincoln, Saint Charles, Saint Louis and 1 more | 54 min |
| Aug 12, 6:37 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis | 53 min |
| Aug 12, 6:41 PM CDT | Areal Flood Advisory | LSX | Lincoln, Saint Charles, Saint Louis | 4 hr |
| Aug 12, 5:28 PM CDT | Areal Flood Advisory | LSX | Bond, Madison | 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.