Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 4, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Mar 27, 2021, 7:03 PM CDT for 4 counties in Illinois. It was in force for 42 min. 11 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, 7:03 PM CDT (00:03 UTC)
- Expired
- Mar 27, 2021, 7:45 PM CDT
- In force
- 42 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Bond County, IL, Clinton County, IL, Madison County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 100 km from the middle of the area, began a volume at 00:05 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, 7:03 PM CDT | TSTM WND DMG | Troy, IL | FENCE AND DECK DAMAGE TO A HOME. |
| Mar 27, 7:05 PM CDT | TSTM WND DMG | 2 Ese Troy, IL | DRYWALL RIPPED FROM A HOME, ROOF RIPPED ALL OFF A POLE BARN. |
| Mar 27, 7:08 PM CDT | TSTM WND DMG | 3 W Saint Jacob, IL | FENCE DAMAGE WITH OUTBUILDING DESTROYED. |
| Mar 27, 7:08 PM CDT | TORNADO | 1 N Saint Jacob, IL | NWS OFFICIAL STORM SURVEY FOUND AN EF-1 TORNADO OCCURRED ALONG AN INTERMITTENT PATH OF NEARLY 5 MILES FROM NORTH OF ST. JACOB EAST INTO HIGHLAND. THE MOST SIGNIFICANT DAMAGE OCCURRED JUST WEST OF HIGHLAND, WHERE A LARGE, WELL-BUILT SHED WAS DESTROYED WITH DEBR |
| Mar 27, 7:15 PM CDT | TSTM WND DMG | Highland, IL | HEAVY DAMAGE TO SEVERAL BUILDINGS, MULTIPLE TREES UPROOTED. |
| Mar 27, 7:17 PM CDT | TSTM WND DMG | 1 W Highland, IL | REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF. |
| Mar 27, 7:17 PM CDT | TSTM WND GST 62 | 1 Ene Highland, IL | |
| Mar 27, 7:18 PM CDT | TSTM WND DMG | Saint Jacob, IL | FLAG POLE SNAPPED IN HALF. |
| Mar 27, 7:20 PM CDT | HAIL 0.75 | 1 S Marine, IL | |
| Mar 27, 7:37 PM CDT | TSTM WND DMG | 4 W Beaver Creek, IL | TREES AND POWER LINES DOWN ALONG MILLERSBURG ROAD. |
| Mar 27, 7:54 PM CDT | TSTM WND DMG | 2 Ssw Marine, IL | DOWNED TREE BRANCHES AND OTHER DEBRIS, REPORTED VIA TWITTER. |
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, 0.1 hours before the alert went out and 176 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.
022
WFUS53 KLSX 280003
TORLSX
ILC005-027-119-163-280045-
/O.NEW.KLSX.TO.W.0004.210328T0003Z-210328T0045Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
703 PM CDT Sat Mar 27 2021
The National Weather Service in St Louis has issued a
* Tornado Warning for...
Northwestern Clinton County in south central Illinois...
Southern Bond County in south central Illinois...
Southeastern Madison County in southwestern Illinois...
Northeastern St. Clair County in southwestern Illinois...
* Until 745 PM CDT.
* At 703 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Troy, moving east at 45 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Highland around 720 PM CDT.
St. Rose around 725 PM CDT.
Pocahontas and Jamestown around 730 PM CDT.
Beaver Creek around 740 PM CDT.
Tamalco around 745 PM CDT.
Other locations impacted by this tornadic thunderstorm include Kuhn,
Smithboro, Pleasant Mound, Keyesport, Grantfork, Pierron, Dudleyville
and Stolletown.
This includes Interstate 70 in Illinois between exits 21 and 52.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 3870 8926 3860 8992 3877 8997 3894 8926
TIME...MOT...LOC 0003Z 257DEG 37KT 3871 8984
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
BRC1 follow-up statement
739
WWUS53 KLSX 280023
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
723 PM CDT Sat Mar 27 2021
ILC163-280032-
/O.CAN.KLSX.TO.W.0004.000000T0000Z-210328T0045Z/
St. Clair IL-
723 PM CDT Sat Mar 27 2021
...THE TORNADO WARNING FOR NORTHEASTERN ST. CLAIR COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois.
LAT...LON 3870 8926 3864 8969 3882 8975 3894 8926
TIME...MOT...LOC 0022Z 257DEG 37KT 3875 8959
$$
ILC005-027-119-280045-
/O.CON.KLSX.TO.W.0004.000000T0000Z-210328T0045Z/
Clinton IL-Bond IL-Madison IL-
723 PM CDT Sat Mar 27 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHWESTERN CLINTON...SOUTHERN BOND COUNTIES IN SOUTH CENTRAL
ILLINOIS AND SOUTHEASTERN MADISON COUNTIES IN SOUTHWESTERN
ILLINOIS...
At 722 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Highland, moving east at 45 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Pocahontas and Jamestown around 730 PM CDT.
Beaver Creek around 735 PM CDT.
Greenville around 740 PM CDT.
Tamalco around 745 PM CDT.
Mulberry Grove around 750 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Smithboro, Pleasant Mound, Keyesport, Grantfork, Pierron, Dudleyville
and Stolletown.
This includes Interstate 70 in Illinois between exits 30 and 52.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 3870 8926 3864 8969 3882 8975 3894 8926
TIME...MOT...LOC 0022Z 257DEG 37KT 3875 8959
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
BRCThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 7:27 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair, Washington | 48 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 |
Nearby
Tornado Warnings in Illinois, 2021Every tornado warning in 2021Tornadoes 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.