Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 140, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 8, 2021, 3:19 PM CDT for 4 counties in Missouri. It was in force for 41 min. 2 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 8, 2021, 3:19 PM CDT (20:19 UTC)
- Expired
- Aug 8, 2021, 4:00 PM CDT
- In force
- 41 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Franklin County, MO, Lincoln County, MO, Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 17 km from the middle of the area, began a volume at 20:18 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 |
|---|---|---|---|
| Aug 8, 3:20 PM CDT | TSTM WND DMG | 3 Nw Marthasville, MO | SEVERAL POWER LINES BLOWN DOWN BETWEEN HOPEWELL AND MARTHASVILLE. |
| Aug 8, 3:38 PM CDT | TSTM WND DMG | Flint Hill, MO | 4 INCH DIAMETER BRANCH DOWN. |
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 8, 12:44 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.3 hours before the alert went out and 240 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
- 310 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1165 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
128
WUUS53 KLSX 082019
SVRLSX
MOC071-113-183-219-082100-
/O.NEW.KLSX.SV.W.0140.210808T2019Z-210808T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
319 PM CDT Sun Aug 8 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
St. Charles County in east central Missouri...
Southeastern Lincoln County in east central Missouri...
Central Franklin County in east central Missouri...
Southeastern Warren County in east central Missouri...
* Until 400 PM CDT.
* At 318 PM CDT, severe thunderstorms were located along a line
extending from Treloar to near Beaufort, moving northeast at 35
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...
Marthasville around 325 PM CDT.
Washington, Warrenton, Truesdale and Innsbrook around 335 PM CDT.
Other locations in the path of these severe thunderstorms include
Dutzow, Wright City, New Melle, Augusta, Wentzville, Defiance, Lake
St. Louis, St. Paul, Josephville, Fountain N' Lakes, Chain of Rocks
and Weldon Spring Heights.
This includes Interstate 70 in Missouri between exits 193 and 222.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in St Louis.
&&
LAT...LON 3905 9071 3901 9069 3896 9068 3895 9067
3868 9058 3869 9066 3864 9073 3854 9074
3841 9110 3868 9124 3890 9109 3906 9084
TIME...MOT...LOC 2018Z 231DEG 30KT 3865 9116 3843 9110
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gosselin2 follow-up statements
139
WWUS53 KLSX 082040
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
340 PM CDT Sun Aug 8 2021
MOC071-082050-
/O.CAN.KLSX.SV.W.0140.000000T0000Z-210808T2100Z/
Franklin MO-
340 PM CDT Sun Aug 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FRANKLIN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3905 9071 3868 9058 3869 9066 3863 9075
3861 9076 3859 9078 3858 9082 3854 9090
3854 9094 3857 9102 3860 9104 3861 9105
3861 9108 3890 9109 3906 9084
TIME...MOT...LOC 2040Z 231DEG 30KT 3876 9099 3854 9093
$$
MOC113-183-219-082100-
/O.CON.KLSX.SV.W.0140.000000T0000Z-210808T2100Z/
St. Charles MO-Lincoln MO-Warren MO-
340 PM CDT Sun Aug 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR ST. CHARLES...SOUTHEASTERN LINCOLN AND SOUTHEASTERN WARREN
COUNTIES...
At 340 PM CDT, severe thunderstorms were located along a line
extending from near Innsbrook to near Augusta, moving northeast at 35
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Wright City, New Melle, Wentzville, Lake St. Louis, Josephville,
Defiance, St. Paul, Fountain N' Lakes, Chain of Rocks, Weldon
Spring Heights, O'Fallon, St. Peters, Dardenne Prairie, Weldon
Spring, Cottleville and Winfield.
This includes Interstate 70 in Missouri between exits 199 and 220.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.
&&
LAT...LON 3905 9071 3868 9058 3869 9066 3863 9075
3861 9076 3859 9078 3858 9082 3854 9090
3854 9094 3857 9102 3860 9104 3861 9105
3861 9108 3890 9109 3906 9084
TIME...MOT...LOC 2040Z 231DEG 30KT 3876 9099 3854 9093
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gosselin625
WWUS53 KLSX 082049
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
349 PM CDT Sun Aug 8 2021
MOC219-082059-
/O.CAN.KLSX.SV.W.0140.000000T0000Z-210808T2100Z/
Warren MO-
349 PM CDT Sun Aug 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3905 9071 3868 9058 3869 9066 3863 9075
3859 9078 3858 9082 3854 9090 3854 9094
3855 9097 3887 9096 3887 9102 3894 9101
3906 9084
TIME...MOT...LOC 2049Z 231DEG 30KT 3880 9093 3858 9087
$$
MOC113-183-082100-
/O.CON.KLSX.SV.W.0140.000000T0000Z-210808T2100Z/
St. Charles MO-Lincoln MO-
349 PM CDT Sun Aug 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR ST. CHARLES AND SOUTHEASTERN LINCOLN COUNTIES...
At 349 PM CDT, severe thunderstorms were located along a line
extending from near Wentzville to Augusta, moving northeast at 35
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
O'Fallon, St. Peters, Wentzville, Lake St. Louis, Dardenne Prairie,
Troy, Weldon Spring, Cottleville, St. Paul, Moscow Mills, Winfield,
New Melle, Josephville, Augusta, Fountain N' Lakes, Chain of Rocks,
Weldon Spring Heights, Defiance, Flint Hill and Foristell.
This includes Interstate 70 in Missouri between exits 203 and 220.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.
&&
LAT...LON 3905 9071 3868 9058 3869 9066 3863 9075
3859 9078 3858 9082 3854 9090 3854 9094
3855 9097 3887 9096 3887 9102 3894 9101
3906 9084
TIME...MOT...LOC 2049Z 231DEG 30KT 3880 9093 3858 9087
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GosselinThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 2:37 PM CDT | Heat Advisory | LSX | Audrain, Boone, Callaway, Cole, Crawford, Franklin and 23 more | 4 days |
| Aug 8, 2:43 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 47 min |
| Aug 8, 3:54 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles | 66 min |
| Aug 8, 4:35 PM CDT | Areal Flood Advisory | LSX | Ralls | 3 hr |
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.