Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 47, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2021, 11:13 AM CDT for Calhoun County, Greene County, Jersey County, Illinois; Lincoln County, Saint Charles County, Warren County, Missouri. It was in force for 47 min. 5 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
- May 27, 2021, 11:13 AM CDT (16:13 UTC)
- Expired
- May 27, 2021, 12:00 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Lincoln County, MO, Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 16:14 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 |
|---|---|---|---|
| May 27, 11:30 AM CDT | TSTM WND DMG | 1 Se Wentzville, MO | TREE REPORTED ON HOME ON GROVE STREET WITH WATER GETTING INTO THE HOME. |
| May 27, 11:30 AM CDT | TSTM WND DMG | 3 Wsw Saint Paul, MO | SEVERAL BRANCHES DOWNED, MANY ONLY A COUPLE INCHES ACROSS. |
| May 27, 11:35 AM CDT | TSTM WND GST 35 | 2 Se Flint Hill, MO | ALSO, VERY HEAVY RAIN. |
| May 27, 12:00 PM CDT | TSTM WND DMG | O'Fallon, MO | SEVERAL SMALL TREE BRANCHES DOWNED. |
| May 27, 12:04 PM CDT | TSTM WND GST 50 | 1 Sse Lake Saint Louis, MO | AT INTERSECTION OF I-64 AND HWY 364. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 4.2 hours before the alert went out and 207 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
- 1679 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
016
WUUS53 KLSX 271613
SVRLSX
ILC013-061-083-MOC113-183-219-271700-
/O.NEW.KLSX.SV.W.0047.210527T1613Z-210527T1700Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1113 AM CDT Thu May 27 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southeastern Calhoun County in southwestern Illinois...
Southern Greene County in southwestern Illinois...
Jersey County in southwestern Illinois...
Northwestern St. Charles County in east central Missouri...
Eastern Lincoln County in east central Missouri...
East central Warren County in east central Missouri...
* Until noon CDT.
* At 1112 AM CDT, severe thunderstorms were located along a line
extending from near Elsberry to Moscow Mills to 6 miles southwest
of Truesdale, moving northeast at 45 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Fountain N' Lakes around 1120 AM CDT.
Winfield and Hardin around 1125 AM CDT.
Other locations in the path of these severe thunderstorms include
Wentzville, Carrollton, Lake St. Louis, St. Paul, Josephville, Chain
of Rocks, Jerseyville, Greenfield and Old Kane.
This includes Interstate 70 in Missouri between exits 199 and 227.
This also includes Pere Marquette State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3938 9016 3912 9015 3874 9057 3874 9126
3894 9096 3922 9074
TIME...MOT...LOC 1612Z 246DEG 38KT 3918 9075 3896 9092 3874 9120
HAIL...0.88IN
WIND...60MPH
$$
MRM2 follow-up statements
948
WWUS53 KLSX 271622
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1122 AM CDT Thu May 27 2021
ILC013-061-083-MOC113-183-219-271700-
/O.CON.KLSX.SV.W.0047.000000T0000Z-210527T1700Z/
Calhoun IL-Greene IL-Jersey IL-St. Charles MO-Lincoln MO-Warren MO-
1122 AM CDT Thu May 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
SOUTHEASTERN CALHOUN...SOUTHERN GREENE...JERSEY...NORTHWESTERN ST.
CHARLES...EASTERN LINCOLN AND EAST CENTRAL WARREN COUNTIES...
At 1122 AM CDT, severe thunderstorms were located along a line
extending from near Hardin to near Winfield to Innsbrook, moving east
at 40 mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe storms will be near...
Winfield and Hardin around 1125 AM CDT.
Other locations in the path of these severe thunderstorms include
Wentzville, Carrollton, Old Kane, Lake St. Louis, St. Paul,
Josephville, O'Fallon, Dardenne Prairie, Grafton, St. Peters,
Cottleville, Greenfield, Kemper, Harvester, Jerseyville, St. Charles
and Orchard Farms.
This also includes Pere Marquette State Park.
This includes Interstate 70 in Missouri between exits 199 and 227.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3938 9016 3912 9015 3874 9057 3874 9118
3881 9115 3894 9096 3922 9074
TIME...MOT...LOC 1622Z 254DEG 36KT 3919 9060 3897 9077 3875 9105
TORNADO...POSSIBLE
HAIL...0.88IN
WIND...70MPH
$$
MRM261
WWUS53 KLSX 271638
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1138 AM CDT Thu May 27 2021
ILC013-061-083-MOC113-183-219-271700-
/O.CON.KLSX.SV.W.0047.000000T0000Z-210527T1700Z/
Calhoun IL-Greene IL-Jersey IL-St. Charles MO-Lincoln MO-Warren MO-
1138 AM CDT Thu May 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
SOUTHEASTERN CALHOUN...SOUTHERN GREENE...JERSEY...NORTHWESTERN ST.
CHARLES...EASTERN LINCOLN AND EAST CENTRAL WARREN COUNTIES...
At 1138 AM CDT, severe thunderstorms were located along a line
extending from near Carrollton to 8 miles northwest of Grafton to
Wentzville, moving east at 45 mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Carrollton, Grafton, St. Peters, Jerseyville, Greenfield, Kemper,
Old Kane, Harvester, St. Charles, Orchard Farms and Elsah.
This also includes Pere Marquette State Park.
This includes Interstate 70 in Missouri between exits 200 and 227.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3938 9016 3912 9015 3874 9057 3874 9110
3879 9107 3894 9092 3923 9070
TIME...MOT...LOC 1638Z 254DEG 39KT 3926 9040 3904 9057 3880 9084
TORNADO...POSSIBLE
HAIL...0.88IN
WIND...70MPH
$$
MRMThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 11:32 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin | 43 min |
| May 27, 11:50 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Macoupin, Madison, Saint Clair | 55 min |
| May 27, 12:07 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin, Montgomery | 38 min |
| May 27, 12:26 PM CDT | Tornado Warning | LSX | Macoupin, Madison | 34 min |
| May 27, 12:39 PM CDT | Areal Flood Advisory | LSX | Calhoun, Madison | 3 hr |
| May 27, 12:56 PM CDT | Tornado Warning | LSX | Bond, Macoupin, Madison, Montgomery | 28 min |
| May 27, 2:16 PM CDT | Areal Flood Advisory | LSX | Bond, Fayette | 3 hr |
| May 27, 2:31 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Fayette, Marion | 44 min |
| May 27, 2:46 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph | 29 min |
| May 27, 1:09 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Saint Louis | 51 min |
| May 27, 1:24 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Gasconade | 51 min |
| May 27, 1:51 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, 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.