Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 20, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 27, 2021, 8:11 PM CDT for Sainte Genevieve County, Saint Francois County, Missouri; Randolph County, Saint Clair County, Washington County, Illinois. It was in force for 64 min. 3 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
- Mar 27, 2021, 8:11 PM CDT (01:11 UTC)
- Expired
- Mar 27, 2021, 9:15 PM CDT
- In force
- 64 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Randolph County, IL, Saint Clair County, IL, Washington County, IL, Saint Francois County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 114 km from the middle of the area, began a volume at 01:15 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 |
|---|---|---|---|
| Mar 27, 8:15 PM CDT | HAIL 0.75 | 2 E Coffman, MO | CORRECTS PREVIOUS HAIL REPORT FROM 2 E COFFMAN. REPORT VIA FACEBOOK. |
| Mar 27, 8:15 PM CDT | HAIL 1 | 3 Ssw River Aux Vases, MO | |
| Mar 27, 8:57 PM CDT | HAIL 0.25 | Chester, IL |
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 |
|---|---|---|---|
| Mar 27, 4:44 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.2 hours before the alert went out and 259 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
- 933 m above ground
- 0-6 km bulk shear
- 86 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
314
WUUS53 KLSX 280111
SVRLSX
ILC157-163-189-MOC186-187-280215-
/O.NEW.KLSX.SV.W.0020.210328T0111Z-210328T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
811 PM CDT Sat Mar 27 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southern Washington County in south central Illinois...
Randolph County in southwestern Illinois...
Southeastern St. Clair County in southwestern Illinois...
Ste. Genevieve County in southeastern Missouri...
Southern St. Francois County in southeastern Missouri...
* Until 915 PM CDT.
* At 811 PM CDT, severe thunderstorms were located along a line
extending from near Lively Grove to near Knob Lick, moving east at
35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Farmington, Chester, Ste. Genevieve, Sparta, Nashville, Bremen,
Steeleville, Marissa, Percy, Coulterville, Tilden, Evansville,
Lively Grove, Ashley, Baldwin, St. Mary, Knob Lick, Weingarten,
Womac and Rocky Ridge.
This includes Interstate 55 in Missouri between exits 141 and 150.
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 3780 8968 3785 8979
3791 8984 3783 8999 3764 9015 3765 9064
3833 8969 3834 8914 3821 8915
TIME...MOT...LOC 0111Z 262DEG 32KT 3832 8956 3770 9029
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING4 follow-up statements
668
WWUS53 KLSX 280124
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
824 PM CDT Sat Mar 27 2021
MOC187-280133-
/O.CAN.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
St. Francois MO-
824 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. FRANCOIS COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois...and southeastern Missouri.
LAT...LON 3822 8959 3795 8960 3780 8968 3785 8979
3791 8984 3783 8999 3773 9007 3773 9027
3833 8969 3834 8914 3821 8915
TIME...MOT...LOC 0123Z 262DEG 32KT 3833 8943 3771 9017
$$
ILC157-163-189-MOC186-280215-
/O.CON.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
Washington IL-Randolph IL-St. Clair IL-Ste. Genevieve MO-
824 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHERN WASHINGTON...RANDOLPH...SOUTHEASTERN ST. CLAIR AND
SOUTHEASTERN STE. GENEVIEVE COUNTIES...
At 823 PM CDT, severe thunderstorms were located along a line
extending from near Nashville to near Womac, moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Chester, Ste. Genevieve, Sparta, Nashville, Bremen, Steeleville,
Marissa, Percy, Coulterville, Tilden, Evansville, Lively Grove,
Ashley, St. Mary, Coffman, Posen, Eden, Preston, Blair and Ellis
Grove.
This includes Interstate 55 in Missouri between exits 141 and 143.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3822 8959 3795 8960 3780 8968 3785 8979
3791 8984 3783 8999 3773 9007 3773 9027
3833 8969 3834 8914 3821 8915
TIME...MOT...LOC 0123Z 262DEG 32KT 3833 8943 3771 9017
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING451
WWUS53 KLSX 280131
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
831 PM CDT Sat Mar 27 2021
ILC163-280141-
/O.CAN.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
St. Clair IL-
831 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. CLAIR COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois...and southeastern Missouri.
LAT...LON 3822 8959 3795 8960 3780 8968 3785 8979
3791 8984 3783 8999 3773 9007 3773 9027
3822 8969 3833 8946 3834 8914 3821 8915
TIME...MOT...LOC 0131Z 262DEG 32KT 3834 8935 3772 9009
$$
ILC157-189-MOC186-280215-
/O.CON.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
Washington IL-Randolph IL-Ste. Genevieve MO-
831 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHEASTERN WASHINGTON...RANDOLPH AND SOUTHEASTERN STE.
GENEVIEVE COUNTIES...
At 831 PM CDT, severe thunderstorms were located along a line
extending from Nashville to 6 miles northeast of Womac, moving east
at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Chester, Sparta, Nashville, Bremen, Steeleville, Percy, Coulterville,
Tilden, Ashley, St. Mary, Coffman, Posen, Eden, Blair, Ellis Grove,
Oakdale, Radom, Du Bois, Rockwood and Kaskaskia.
This includes Interstate 55 in Missouri between exits 141 and 143.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3822 8959 3795 8960 3780 8968 3785 8979
3791 8984 3783 8999 3773 9007 3773 9027
3822 8969 3833 8946 3834 8914 3821 8915
TIME...MOT...LOC 0131Z 262DEG 32KT 3834 8935 3772 9009
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING990
WWUS53 KLSX 280140
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
840 PM CDT Sat Mar 27 2021
MOC186-280149-
/O.CAN.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
Ste. Genevieve MO-
840 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN STE. GENEVIEVE
COUNTY IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois.
LAT...LON 3821 8959 3795 8960 3781 8968 3785 8974
3785 8979 3788 8980 3791 8984 3787 8992
3788 8994 3813 8970 3833 8946 3834 8915
3821 8915
TIME...MOT...LOC 0139Z 262DEG 32KT 3835 8927 3773 9001
$$
ILC157-189-280215-
/O.CON.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
Washington IL-Randolph IL-
840 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHEASTERN WASHINGTON AND SOUTHEASTERN RANDOLPH COUNTIES...
At 839 PM CDT, severe thunderstorms were located along a line
extending from near Ashley to 7 miles west of Perryville, moving east
at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained spotters reported quarter size hail 13 miles
southwest of Ste. Genevieve.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Chester, Sparta, Nashville, Bremen, Steeleville, Percy, Coulterville,
Ashley, Posen, Eden, Blair, Oakdale, Radom, Du Bois, Rockwood, Welge,
Cordes, New Palestine and Shiloh Hill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3821 8959 3795 8960 3781 8968 3785 8974
3785 8979 3788 8980 3791 8984 3787 8992
3788 8994 3813 8970 3833 8946 3834 8915
3821 8915
TIME...MOT...LOC 0139Z 262DEG 32KT 3835 8927 3773 9001
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING702
WWUS53 KLSX 280149
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
849 PM CDT Sat Mar 27 2021
ILC189-280159-
/O.CAN.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
Washington IL-
849 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southwestern Illinois.
LAT...LON 3795 8960 3781 8968 3785 8974 3785 8979
3788 8980 3791 8984 3787 8992 3788 8994
3803 8979 3810 8959
TIME...MOT...LOC 0149Z 256DEG 30KT 3801 8967 3778 8988
$$
ILC157-280215-
/O.CON.KLSX.SV.W.0020.000000T0000Z-210328T0215Z/
Randolph IL-
849 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHEASTERN RANDOLPH COUNTY...
At 849 PM CDT, severe thunderstorms were located along a line
extending from Steeleville to near Perryville, moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Chester, Bremen, Steeleville, Percy, Blair, Rockwood, Welge, New
Palestine and Shiloh Hill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3795 8960 3781 8968 3785 8974 3785 8979
3788 8980 3791 8984 3787 8992 3788 8994
3803 8979 3810 8959
TIME...MOT...LOC 0149Z 256DEG 30KT 3801 8967 3778 8988
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 7:27 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve, Saint Francois | 48 min |
| Mar 27, 7:53 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds, Saint Francois | 67 min |
| Mar 27, 9:10 PM CDT | Areal Flood Advisory | LSX | Madison | 3 hr |
| Mar 27, 7:03 PM CDT | Tornado Warning | LSX | Bond, Clinton, Madison, Saint Clair | 42 min |
| Mar 27, 7:06 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Monroe, Saint Clair, Washington | 39 min |
| Mar 27, 7:13 PM CDT | Tornado Warning | LSX | Clinton, Saint Clair, Washington | 47 min |
| Mar 27, 7:43 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Fayette, Madison, Marion, Saint Clair and 1 more | 47 min |
| Mar 27, 7:45 PM CDT | Tornado Warning | LSX | Bond, Clinton, Fayette, Marion | 45 min |
| Mar 27, 7:59 PM CDT | Tornado Warning | LSX | Clinton, Marion, Washington | 31 min |
| Mar 27, 8:21 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Fayette, Marion, Washington | 39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.