Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 17, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 27, 2021, 7:27 PM CDT for 4 counties in Illinois; Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 48 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, 7:27 PM CDT (00:27 UTC)
- Expired
- Mar 27, 2021, 8:15 PM CDT
- In force
- 48 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Monroe County, IL, 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), 86 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 27, 7:46 PM CDT | TSTM WND DMG | 2 S Farmington, MO | TREE LIMBS REPORTED DOWN VIA PUBLIC REPORT. |
| 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 |
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, 0.5 hours before the alert went out and 281 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.
257
WUUS53 KLSX 280027
SVRLSX
ILC133-157-163-189-MOC186-187-280115-
/O.NEW.KLSX.SV.W.0017.210328T0027Z-210328T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
727 PM CDT Sat Mar 27 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southeastern Monroe County in southwestern Illinois...
Southwestern Washington County in south central Illinois...
Randolph County in southwestern Illinois...
Southeastern St. Clair County in southwestern Illinois...
Ste. Genevieve County in southeastern Missouri...
St. Francois County in southeastern Missouri...
* Until 815 PM CDT.
* At 727 PM CDT, severe thunderstorms were located along a line
extending from near Smithton to near Pilot Knob, 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, Desloge, Ste. Genevieve, Sparta, Red Bud, Bismarck,
Park Hills, New Athens, Marissa, Tilden, Iron Mountain Lake,
Evansville, Lively Grove, Bloomsdale, Baldwin, St. Mary,
Weingarten, Womac, Rocky Ridge and Knob Lick.
This includes Interstate 55 in Missouri between exits 141 and 162.
This also includes St. Joe State Park, Hawn State Park, Felix Valle
House State Park, and Missouri Mines Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3772 9065 3810 9033 3809 9029 3812 9025
3816 9027 3831 9014 3834 8950 3765 9014
3765 9064
TIME...MOT...LOC 0027Z 263DEG 32KT 3834 9002 3762 9071
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING3 follow-up statements
703
WWUS53 KLSX 280038
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
738 PM CDT Sat Mar 27 2021
ILC133-157-163-189-MOC186-187-280115-
/O.CON.KLSX.SV.W.0017.000000T0000Z-210328T0115Z/
Monroe IL-Washington IL-Randolph IL-St. Clair IL-Ste. Genevieve MO-
St. Francois MO-
738 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHEASTERN MONROE...SOUTHWESTERN WASHINGTON...RANDOLPH...
SOUTHEASTERN ST. CLAIR...STE. GENEVIEVE AND SOUTHEASTERN ST. FRANCOIS
COUNTIES...
At 738 PM CDT, severe thunderstorms were located along a line
extending from near New Athens to near Pilot Knob, moving east at 35
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Farmington, Ste. Genevieve, Sparta, Red Bud, Park Hills, New Athens,
Marissa, Tilden, Iron Mountain Lake, Evansville, Lively Grove,
Bloomsdale, Baldwin, St. Mary, Knob Lick, Weingarten, Womac, Rocky
Ridge, Coffman and Iron Mountain.
This also includes St. Joe State Park, Hawn State Park, Felix Valle
House State Park, and Missouri Mines Historic Site.
This includes Interstate 55 in Missouri between exits 141 and 162.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3834 8950 3765 9014 3765 9064 3772 9064
3809 9028 3832 8999
TIME...MOT...LOC 0038Z 263DEG 32KT 3835 8991 3763 9060
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING418
WWUS53 KLSX 280051
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
751 PM CDT Sat Mar 27 2021
ILC133-157-163-189-MOC186-187-280115-
/O.CON.KLSX.SV.W.0017.000000T0000Z-210328T0115Z/
Monroe IL-Washington IL-Randolph IL-St. Clair IL-Ste. Genevieve MO-
St. Francois MO-
751 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHEASTERN MONROE...SOUTHWESTERN WASHINGTON...RANDOLPH...
SOUTHEASTERN ST. CLAIR...STE. GENEVIEVE AND SOUTHERN ST. FRANCOIS
COUNTIES...
At 750 PM CDT, severe thunderstorms were located along a line
extending from near Marissa to near Iron Mountain Lake, moving east
at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters reported tree limbs down in
Farmington.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Farmington, Ste. Genevieve, Sparta, Red Bud, Park Hills, New Athens,
Marissa, Tilden, Iron Mountain Lake, Evansville, Lively Grove,
Bloomsdale, Baldwin, St. Mary, Knob Lick, Weingarten, Womac, Rocky
Ridge, Coffman and Preston.
This also includes Hawn State Park and Felix Valle House State Park.
This includes Interstate 55 in Missouri between exits 141 and 157.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3834 8950 3765 9014 3765 9064 3832 8999
TIME...MOT...LOC 0050Z 265DEG 28KT 3830 8979 3768 9052
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
CVKING641
WWUS53 KLSX 280107
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
807 PM CDT Sat Mar 27 2021
ILC133-280116-
/O.CAN.KLSX.SV.W.0017.000000T0000Z-210328T0115Z/
Monroe IL-
807 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois...and southeastern Missouri.
LAT...LON 3834 8950 3765 9014 3765 9064 3833 8969
TIME...MOT...LOC 0106Z 263DEG 32KT 3832 8961 3770 9034
$$
ILC157-163-189-MOC186-187-280115-
/O.CON.KLSX.SV.W.0017.000000T0000Z-210328T0115Z/
Washington IL-Randolph IL-St. Clair IL-Ste. Genevieve MO-
St. Francois MO-
807 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHWESTERN WASHINGTON...RANDOLPH...SOUTHEASTERN ST. CLAIR...
STE. GENEVIEVE AND SOUTHERN ST. FRANCOIS COUNTIES...
At 806 PM CDT, severe thunderstorms were located along a line
extending from 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, Ste. Genevieve, Sparta, Marissa, Tilden, Evansville,
Lively Grove, Baldwin, St. Mary, Knob Lick, Weingarten, Womac, Rocky
Ridge, Coffman, Preston, Ellis Grove, Houston, Kaskaskia, Roots and
Modoc.
This also includes Hawn State Park and Felix Valle House State Park.
This includes Interstate 55 in Missouri between exits 141 and 150.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3834 8950 3765 9014 3765 9064 3833 8969
TIME...MOT...LOC 0106Z 263DEG 32KT 3832 8961 3770 9034
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, 7:03 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, 8:11 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair, Washington | 64 min |
| Mar 27, 8:21 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Fayette, Marion, Washington | 39 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 |
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.