Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 148, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 12, 2021, 7:14 PM CDT for 6 counties in Illinois; Jefferson County, Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 61 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 12, 2021, 7:14 PM CDT (00:14 UTC)
- Expired
- Aug 12, 2021, 8:15 PM CDT
- In force
- 61 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Clinton County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 103 km from the middle of the area, began a volume at 00:17 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 12, 7:20 PM CDT | TSTM WND DMG | 3 Nnw Freeburg, IL | POWER LINES BLOWN DOWN AT THE INTERSECTION OF ILLINOIS ROUTE 15 AND JEFFERSON ROAD. |
| Aug 12, 7:22 PM CDT | TSTM WND DMG | Freeburg, IL | NUMEROUS TREES AND TREE LIMBS BLOWN DOWN AROUND TOWN. |
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 12, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.2 hours before the alert went out and 250 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
- 1699 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
932
WUUS53 KLSX 130014
SVRLSX
ILC027-119-133-157-163-189-MOC099-186-187-130115-
/O.NEW.KLSX.SV.W.0148.210813T0014Z-210813T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
714 PM CDT Thu Aug 12 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southern Clinton County in south central Illinois...
Southern Monroe County in southwestern Illinois...
Southeastern Madison County in southwestern Illinois...
Washington County in south central Illinois...
Randolph County in southwestern Illinois...
St. Clair County in southwestern Illinois...
Southeastern Jefferson County in east central Missouri...
Ste. Genevieve County in southeastern Missouri...
Northwestern St. Francois County in southeastern Missouri...
* Until 815 PM CDT.
* At 712 PM CDT, severe thunderstorms were located along a line
extending from Shiloh to New Design to near De Soto, moving
southeast at 50 mph.
HAZARD...70 mph wind gusts.
SOURCE...This line of storms has a history of damaging wind gusts.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Mascoutah, Lebanon, Red Bud and Scott AFB around 720 PM CDT.
New Baden around 725 PM CDT.
Albers, Evansville, Baldwin and New Memphis around 730 PM CDT.
Other locations in the path of these severe thunderstorms include
Bloomsdale, Rocky Ridge, Sparta, Okawville, Weingarten, Ste.
Genevieve, Nashville, Steeleville, Percy, Chester and St. Mary.
This includes the following highways...
Interstate 64 in Illinois between exits 14 and 61.
Interstate 55 in Missouri between exits 141 and 174.
This also includes Hawn State Park and Felix Valle House State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3822 8959 3795 8960 3781 8967 3785 8979
3791 8984 3783 8999 3767 9011 3810 9068
3829 9017 3875 8983 3849 8914 3821 8915
TIME...MOT...LOC 0012Z 298DEG 43KT 3856 8989 3825 9009 3810 9052
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Elmore1 follow-up statement
084
WWUS53 KLSX 130054
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
754 PM CDT Thu Aug 12 2021
ILC119-133-MOC099-187-130103-
/O.CAN.KLSX.SV.W.0148.000000T0000Z-210813T0115Z/
Monroe IL-Madison IL-Jefferson MO-St. Francois MO-
754 PM CDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MONROE AND
SOUTHEASTERN MADISON COUNTIES IN SOUTHWESTERN ILLINOIS...SOUTHEASTERN
JEFFERSON COUNTY IN EAST CENTRAL MISSOURI AND NORTHWESTERN ST.
FRANCOIS COUNTIES IN SOUTHEASTERN MISSOURI IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central and southwestern Illinois...and southeastern and east
central Missouri.
LAT...LON 3821 8915 3822 8959 3795 8960 3781 8968
3791 8984 3783 8999 3767 9011 3791 9042
3798 9032 3804 9041 3806 9038 3813 9025
3809 9020 3813 9004 3823 9001 3822 8990
3828 8992 3866 8973 3866 8959 3849 8914
TIME...MOT...LOC 0053Z 298DEG 43KT 3834 8937 3803 8957 3788 9000
$$
ILC027-157-163-189-MOC186-130115-
/O.CON.KLSX.SV.W.0148.000000T0000Z-210813T0115Z/
Clinton IL-Washington IL-Randolph IL-St. Clair IL-Ste. Genevieve MO-
754 PM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHERN CLINTON...WASHINGTON...RANDOLPH...EASTERN ST. CLAIR AND
STE. GENEVIEVE COUNTIES...
At 753 PM CDT, severe thunderstorms were located along a line
extending from Nashville to near Percy to near St. Mary, moving
southeast at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...This line of storms has a history of damaging wind gusts.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Nashville and Ashley.
This also includes Hawn State Park and Felix Valle House State Park.
This includes the following highways...
Interstate 64 in Illinois between exits 27 and 61.
Interstate 55 in Missouri between exits 141 and 162.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3821 8915 3822 8959 3795 8960 3781 8968
3791 8984 3783 8999 3767 9011 3791 9042
3798 9032 3804 9041 3806 9038 3813 9025
3809 9020 3813 9004 3823 9001 3822 8990
3828 8992 3866 8973 3866 8959 3849 8914
TIME...MOT...LOC 0053Z 298DEG 43KT 3834 8937 3803 8957 3788 9000
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
ElmoreThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 7:40 PM CDT | Flash Flood Warning | LSX | Bond, Madison | 4 hr |
| Aug 13, 9:33 AM CDT | River Flood Warning | LSX | Lewis | 13 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.