Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 141, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 8, 2021, 3:54 PM CDT for Calhoun County, Greene County, Jersey County, Illinois; Lincoln County, Saint Charles County, Missouri. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2021, 3:54 PM CDT (20:54 UTC)
- Expired
- Aug 8, 2021, 5:00 PM CDT
- In force
- 66 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, Jersey County, IL, Lincoln County, MO, Saint Charles County, MO
The radar
The St Louis radar (KLSX), 60 km from the middle of the area, began a volume at 20:53 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.
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, 8.9 hours before the alert went out and 184 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.
870
WUUS53 KLSX 082054
SVRLSX
ILC013-061-083-MOC113-183-082200-
/O.NEW.KLSX.SV.W.0141.210808T2054Z-210808T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
354 PM CDT Sun Aug 8 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southeastern Calhoun County in southwestern Illinois...
Greene County in southwestern Illinois...
Jersey County in southwestern Illinois...
North central St. Charles County in east central Missouri...
Southeastern Lincoln County in east central Missouri...
* Until 500 PM CDT.
* At 353 PM CDT, severe thunderstorms were located along a line
extending from near Fountain N' Lakes to near O'Fallon, moving
northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Hardin, Grafton, Elsah, Jerseyville, Carrollton, Old Kane,
Greenfield, Kemper and Athensville.
This includes Interstate 70 in Missouri between exits 217 and 220.
This also includes Pere Marquette State Park.
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 3949 9015 3904 9015 3900 9023 3900 9027
3898 9028 3877 9070 3905 9082 3938 9049
3952 9016
TIME...MOT...LOC 2053Z 226DEG 38KT 3901 9084 3881 9068
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gosselin3 follow-up statements
063
WWUS53 KLSX 082124
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
424 PM CDT Sun Aug 8 2021
ILC013-MOC113-183-082134-
/O.CAN.KLSX.SV.W.0141.000000T0000Z-210808T2200Z/
Calhoun IL-St. Charles MO-Lincoln MO-
424 PM CDT Sun Aug 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CALHOUN...NORTH
CENTRAL ST. CHARLES AND SOUTHEASTERN LINCOLN COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3949 9015 3904 9015 3900 9023 3900 9027
3898 9028 3894 9035 3897 9046 3895 9052
3899 9057 3903 9057 3905 9059 3907 9058
3914 9062 3917 9061 3920 9059 3926 9061
3938 9049 3952 9016
TIME...MOT...LOC 2124Z 226DEG 38KT 3921 9057 3901 9041
$$
ILC061-083-082200-
/O.CON.KLSX.SV.W.0141.000000T0000Z-210808T2200Z/
Greene IL-Jersey IL-
424 PM CDT Sun Aug 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR GREENE AND JERSEY COUNTIES...
At 424 PM CDT, severe thunderstorms were located along a line
extending from near Hardin to near Grafton, moving northeast at 45
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jerseyville, Carrollton, Brighton, Greenfield, Hardin, Grafton,
Elsah, Athensville, Old Kane, Kemper, Kane, Wrights, Fieldon, Eldred,
Rockbridge, Otterville, Fidelity, Delhi, Belltown and Berdan.
This also includes Pere Marquette State Park.
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 3949 9015 3904 9015 3900 9023 3900 9027
3898 9028 3894 9035 3897 9046 3895 9052
3899 9057 3903 9057 3905 9059 3907 9058
3914 9062 3917 9061 3920 9059 3926 9061
3938 9049 3952 9016
TIME...MOT...LOC 2124Z 226DEG 38KT 3921 9057 3901 9041
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gosselin390
WWUS53 KLSX 082147
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
447 PM CDT Sun Aug 8 2021
ILC061-083-082200-
/O.CON.KLSX.SV.W.0141.000000T0000Z-210808T2200Z/
Greene IL-Jersey IL-
447 PM CDT Sun Aug 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR EASTERN GREENE AND EASTERN JERSEY COUNTIES...
At 447 PM CDT, severe thunderstorms were located along a line
extending from near Carrollton to near Kemper, moving northeast at 45
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jerseyville, Brighton, Greenfield, Elsah, Athensville, Kemper, Kane,
Wrights, Rockbridge, Fidelity, Delhi, Belltown, Berdan and McClusky.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.
&&
LAT...LON 3949 9015 3904 9015 3900 9023 3900 9027
3898 9028 3894 9035 3901 9034 3925 9037
3941 9042 3952 9016
TIME...MOT...LOC 2147Z 226DEG 38KT 3936 9037 3916 9021
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gosselin786
WWUS53 KLSX 082155
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
455 PM CDT Sun Aug 8 2021
ILC061-083-082205-
/O.EXP.KLSX.SV.W.0141.000000T0000Z-210808T2200Z/
Greene IL-Jersey IL-
455 PM CDT Sun Aug 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN GREENE AND EASTERN
JERSEY COUNTIES WILL EXPIRE AT 500 PM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
southwestern Illinois...and east central Missouri.
LAT...LON 3949 9015 3904 9015 3900 9023 3900 9027
3898 9028 3894 9035 3901 9034 3925 9037
3941 9042 3952 9016
TIME...MOT...LOC 2155Z 226DEG 38KT 3941 9030 3921 9014
$$
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 | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 4 days |
| Aug 8, 2:54 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 50 min |
| Aug 8, 4:35 PM CDT | Areal Flood Advisory | LSX | Adams, Pike | 3 hr |
| Aug 8, 2:43 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 47 min |
| Aug 8, 3:19 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Lincoln, Saint Charles, Warren | 41 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2021Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.