Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 6, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 23, 2021, 11:02 PM CDT for Monroe County, Saint Clair County, Illinois. It was in force for 43 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
- Mar 23, 2021, 11:02 PM CDT (04:02 UTC)
- Expired
- Mar 23, 2021, 11:45 PM CDT
- In force
- 43 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 04:05 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 nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.0 hours before the alert went out and 239 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
- 281 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 642 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 196 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
The text
As transmitted.
808 WUUS53 KLSX 240402 SVRLSX ILC133-163-240445- /O.NEW.KLSX.SV.W.0006.210324T0402Z-210324T0445Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service St Louis MO 1102 PM CDT Tue Mar 23 2021 The National Weather Service in St Louis has issued a * Severe Thunderstorm Warning for... Central Monroe County in southwestern Illinois... Central St. Clair County in southwestern Illinois... * Until 1145 PM CDT. * At 1102 PM CDT, a severe thunderstorm was located over New Design, 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. * Locations impacted include... Belleville, Waterloo, Freeburg, Smithton, New Athens, New Design, Hecker, Floraville, Paderborn and Burksville. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. This thunderstorm is capable of producing all types of severe weather including extremely large hail, destructive straight line winds and tornadoes. Move quickly to a safe shelter such as an interior room, a bathroom, closet or basement. && LAT...LON 3823 9015 3827 9019 3853 8998 3836 8980 TIME...MOT...LOC 0402Z 223DEG 29KT 3828 9014 TORNADO...POSSIBLE HAIL...0.75IN WIND...60MPH $$ TES
2 follow-up statements
991
WWUS53 KLSX 240425
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1125 PM CDT Tue Mar 23 2021
ILC133-240435-
/O.CAN.KLSX.SV.W.0006.000000T0000Z-210324T0445Z/
Monroe IL-
1125 PM CDT Tue Mar 23 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONROE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3831 8994 3831 9004 3832 9004 3838 9010
3853 8998 3836 8980
TIME...MOT...LOC 0425Z 223DEG 29KT 3842 8998
$$
ILC163-240445-
/O.CON.KLSX.SV.W.0006.000000T0000Z-210324T0445Z/
St. Clair IL-
1125 PM CDT Tue Mar 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR CENTRAL ST. CLAIR COUNTY...
At 1125 PM CDT, a severe thunderstorm was located over Smithton,
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.
Locations impacted include...
Belleville, Freeburg, Smithton, New Athens, Floraville and Paderborn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.
&&
LAT...LON 3831 8994 3831 9004 3832 9004 3838 9010
3853 8998 3836 8980
TIME...MOT...LOC 0425Z 223DEG 29KT 3842 8998
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
Glass119
WWUS53 KLSX 240449
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1149 PM CDT Tue Mar 23 2021
ILC163-240458-
/O.EXP.KLSX.SV.W.0006.000000T0000Z-210324T0445Z/
St. Clair IL-
1149 PM CDT Tue Mar 23 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ST. CLAIR COUNTY HAS
EXPIRED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.
LAT...LON 3831 8994 3831 9004 3832 9004 3838 9010
3853 8998 3836 8980
TIME...MOT...LOC 0448Z 223DEG 29KT 3855 8982
$$
GlassThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 7:04 PM CDT | Tornado Warning | LSX | Pike | 41 min |
| Mar 23, 7:26 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Pike | 34 min |
| Mar 23, 7:35 PM CDT | Tornado Warning | LSX | Calhoun, Pike | 25 min |
Nearby
Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.