Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 164, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Sep 14, 2021, 6:45 PM CDT for Saint Clair County, Illinois. It was in force for 30 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
- Sep 14, 2021, 6:45 PM CDT (23:45 UTC)
- Expired
- Sep 14, 2021, 7:15 PM CDT
- In force
- 30 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Saint Clair County, IL
The radar
The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 23:47 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 12:00Z, 11.8 hours before the alert went out and 225 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
- 1485 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 988 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.6
The text
As transmitted.
723 WUUS53 KLSX 142345 SVRLSX ILC163-150015- /O.NEW.KLSX.SV.W.0164.210914T2345Z-210915T0015Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service St Louis MO 645 PM CDT Tue Sep 14 2021 The National Weather Service in St Louis has issued a * Severe Thunderstorm Warning for... Southeastern St. Clair County in southwestern Illinois... * Until 715 PM CDT. * At 645 PM CDT, a severe thunderstorm was located over Freeburg, moving east at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * This severe thunderstorm will be near... New Athens around 650 PM CDT. Other locations impacted by this severe thunderstorm include Lenzburg, St. Libory and Fayetteville. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3837 9003 3850 8996 3847 8971 3822 8970 TIME...MOT...LOC 2345Z 282DEG 23KT 3842 8989 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ MRM
2 follow-up statements
195 WWUS53 KLSX 142353 SVSLSX Severe Weather Statement National Weather Service St Louis MO 653 PM CDT Tue Sep 14 2021 ILC163-150015- /O.CON.KLSX.SV.W.0164.000000T0000Z-210915T0015Z/ St. Clair IL- 653 PM CDT Tue Sep 14 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR SOUTHEASTERN ST. CLAIR COUNTY... At 653 PM CDT, a severe thunderstorm was located near Freeburg, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of southeastern St. Clair County, including the following locations... St. Libory, Fayetteville and Lenzburg. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3849 8993 3847 8971 3822 8970 3838 8994 TIME...MOT...LOC 2353Z 284DEG 29KT 3840 8979 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ MRM
645
WWUS53 KLSX 150005
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
705 PM CDT Tue Sep 14 2021
ILC163-150015-
/O.EXP.KLSX.SV.W.0164.000000T0000Z-210915T0015Z/
St. Clair IL-
705 PM CDT Tue Sep 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. CLAIR COUNTY
WILL EXPIRE AT 715 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 3849 8993 3847 8971 3822 8970 3838 8994
TIME...MOT...LOC 0005Z 282DEG 23KT 3839 8970
$$
MRMNearby
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.