Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 29, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2021, 7:26 PM CDT for Randolph County, Saint Clair County, Washington County, Illinois. It was in force for 49 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
- Apr 9, 2021, 7:26 PM CDT (00:26 UTC)
- Expired
- Apr 9, 2021, 8:15 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Randolph County, IL, Saint Clair County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 91 km from the middle of the area, began a volume at 00:28 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, 0.4 hours before the alert went out and 231 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1896 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
633
WUUS53 KLSX 100026
SVRLSX
ILC157-163-189-100115-
/O.NEW.KLSX.SV.W.0029.210410T0026Z-210410T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
726 PM CDT Fri Apr 9 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southwestern Washington County in south central Illinois...
Northeastern Randolph County in southwestern Illinois...
Southeastern St. Clair County in southwestern Illinois...
* Until 815 PM CDT.
* At 725 PM CDT, a severe thunderstorm was located over Sparta,
moving northeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Public.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Freeburg, Sparta, New Athens, Marissa, Coulterville, Tilden, Lively
Grove, Baldwin, Eden, St. Libory, Prairie, Lenzburg, Johannisburg,
Fayetteville, Addieville, Houston, Venedy, Elkton and Stone Church.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3822 8955 3822 8959 3810 8960 3812 8996
3822 8994 3822 8990 3823 8990 3827 8993
3829 8992 3828 8991 3828 8990 3831 8992
3846 8988 3843 8971 3842 8970 3843 8968
3840 8947
TIME...MOT...LOC 0025Z 212DEG 12KT 3815 8975
HAIL...1.00IN
WIND...60MPH
$$
BRC2 follow-up statements
051
WWUS53 KLSX 100045
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
745 PM CDT Fri Apr 9 2021
ILC157-100053-
/O.CAN.KLSX.SV.W.0029.000000T0000Z-210410T0115Z/
Randolph IL-
745 PM CDT Fri Apr 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN RANDOLPH COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3822 8955 3822 8990 3823 8990 3827 8993
3829 8992 3828 8991 3828 8990 3831 8992
3846 8988 3843 8971 3842 8970 3843 8968
3840 8947
TIME...MOT...LOC 0043Z 212DEG 12KT 3820 8971
$$
ILC163-189-100115-
/O.CON.KLSX.SV.W.0029.000000T0000Z-210410T0115Z/
Washington IL-St. Clair IL-
745 PM CDT Fri Apr 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHWESTERN WASHINGTON AND SOUTHEASTERN ST. CLAIR COUNTIES...
At 743 PM CDT, a severe thunderstorm was located over Tilden, moving
northeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Public. At 728 PM...wind damage to trees was reported in
Coulterville, IL.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Freeburg, New Athens, Marissa, Lively Grove, St. Libory, Lenzburg,
Johannisburg, Fayetteville, Addieville, Venedy, Elkton and Stone
Church.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3822 8955 3822 8990 3823 8990 3827 8993
3829 8992 3828 8991 3828 8990 3831 8992
3846 8988 3843 8971 3842 8970 3843 8968
3840 8947
TIME...MOT...LOC 0043Z 212DEG 12KT 3820 8971
HAIL...1.00IN
WIND...60MPH
$$
BRC409
WWUS53 KLSX 100106
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
806 PM CDT Fri Apr 9 2021
ILC163-189-100115-
/O.EXP.KLSX.SV.W.0029.000000T0000Z-210410T0115Z/
Washington IL-St. Clair IL-
806 PM CDT Fri Apr 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WASHINGTON AND
SOUTHEASTERN ST. CLAIR COUNTIES WILL EXPIRE AT 815 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds are still possible with
this thunderstorm.
LAT...LON 3822 8955 3822 8990 3823 8990 3827 8993
3829 8992 3828 8991 3828 8990 3831 8992
3846 8988 3843 8971 3842 8970 3843 8968
3840 8947
TIME...MOT...LOC 0105Z 212DEG 12KT 3825 8967
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 10:09 AM CDT | Wind Advisory | LSX | Adams, Bond, Brown, Calhoun, Greene, Jersey and 4 more | 14 hr |
| Apr 10, 2:26 PM CDT | River Flood Warning | LSX | Brown | 6 days |
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.