Alert archive / Illinois / Flash Flood Warnings in 2026
Flash Flood Warning 39, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jun 21, 2026, 4:27 PM CDT for Marion County, Illinois. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2026, 4:27 PM CDT (21:27 UTC)
- Expired
- Jun 21, 2026, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Marion County, IL
The radar
The Evansville,IN radar (KVWX), 116 km from the middle of the area, began a volume at 21:30 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.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.5 hours before the alert went out and 155 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
- 1482 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
550
WGUS53 KLSX 212127
FFWLSX
ILC121-220130-
/O.NEW.KLSX.FF.W.0039.260621T2127Z-260622T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
427 PM CDT Sun Jun 21 2026
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northern Marion County in south central Illinois...
* Until 830 PM CDT.
* At 427 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Kinmundy, Patoka, Farina, Omega, Stephen Forbes Station, Fairman,
Alma, Vernon and Brubaker.
This includes the following State Parks...
Stephen A. Forbes State Recreation Area.
This includes Interstate 57 in Illinois near exit 127.
This includes the following streams and drainages...
Flat Creek, Lee Creek, and East Fork Kaskaskia River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3883 8870 3868 8870 3867 8914 3882 8914
3882 8893
FLASH FLOOD...RADAR INDICATED
$$
Carney2 follow-up statements
713
WGUS73 KLSX 212259
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
559 PM CDT Sun Jun 21 2026
ILC121-220130-
/O.CON.KLSX.FF.W.0039.000000T0000Z-260622T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion IL-
559 PM CDT Sun Jun 21 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT THIS
EVENING FOR NORTHERN MARION COUNTY IN SOUTH CENTRAL ILLINOIS...
At 559 PM CDT, Doppler radar indicated thunderstorms have produced
between 4 and 6 inches of rainfall. Runoff from this heavy rain is
producing life threatening flash flooding.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar indicated.
IMPACT...Life threatening flash flooding of creeks and streams, urban
areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Kinmundy, Patoka, Farina, Omega, Stephen Forbes Station, Fairman,
Alma, Vernon and Brubaker.
This includes the following State Parks...
Stephen A. Forbes State Recreation Area.
This includes Interstate 57 in Illinois near exit 127.
This includes the following streams and drainages...
Flat Creek, Lee Creek, and East Fork Kaskaskia River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3883 8870 3868 8870 3867 8914 3882 8914
3882 8893
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Carney293
WGUS53 KLSX 220127
FFWLSX
ILC121-220300-
/O.EXT.KLSX.FF.W.0039.000000T0000Z-260622T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
827 PM CDT Sun Jun 21 2026
The National Weather Service in St Louis has extended the
* Flash Flood Warning for...
Northern Marion County in south central Illinois...
* Until 1000 PM CDT.
* At 827 PM CDT, Doppler radar indicated thunderstorms produced heavy
rain across the warned area. Between 4 and 5 inches of rain have
fallen. Life threatening flash flooding is ongoing.
HAZARD...Life threatening flash flooding. Thunderstorms produced
flash flooding.
SOURCE...Radar indicated.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Kinmundy, Patoka, Farina, Omega, Stephen Forbes Station, Fairman,
Alma, Vernon and Brubaker.
This includes the following State Parks...
Stephen A. Forbes State Recreation Area.
This includes Interstate 57 in Illinois near exit 127.
This includes the following streams and drainages...
Louse Run, Crooked Creek, Davidson Creek, Skillet Fork, Crabapple
Branch, Bee Branch, Wills Creek, Brubaker Creek, Barden Creek,
Warren Branch, Flat Creek, Kaskaskia River, Lost Fork, Bear Creek,
Town Creek, Schneider Springs Branch, Jims Creek, Dums Creek and
East Fork Kaskaskia River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3883 8870 3868 8870 3867 8914 3882 8914
3882 8893
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JajaThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 2:47 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 43 min |
| Jun 21, 2:54 PM CDT | Tornado Warning | LSX | Bond, Madison | 36 min |
| Jun 21, 3:03 PM CDT | Tornado Warning | LSX | Fayette | 15 min |
| Jun 21, 3:23 PM CDT | Tornado Warning | LSX | Bond, Fayette | 52 min |
| Jun 21, 3:26 PM CDT | Flash Flood Warning | LSX | Bond, Fayette, Montgomery | 4 hr |
| Jun 21, 3:44 PM CDT | Flash Flood Warning | LSX | Fayette | 6 hr |
| Jun 21, 3:45 PM CDT | Tornado Warning | LSX | Fayette, Marion | 60 min |
| Jun 21, 5:02 PM CDT | Tornado Warning | LSX | Clinton, Madison, Saint Clair | 43 min |
| Jun 21, 5:07 PM CDT | Tornado Warning | LSX | Bond, Fayette, Marion | 38 min |
| Jun 21, 5:19 PM CDT | Tornado Warning | LSX | Fayette, Marion | 41 min |
| Jun 21, 5:35 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Marion | 70 min |
| Jun 21, 5:40 PM CDT | Tornado Warning | LSX | Marion | 39 min |
| Jun 21, 5:43 PM CDT | Severe Thunderstorm Warning | LSX | Clinton | 39 min |
| Jun 21, 5:50 PM CDT | Tornado Warning | LSX | Clinton | 32 min |
| Jun 21, 6:08 PM CDT | Tornado Warning | LSX | Marion | 10 min |
| Jun 21, 6:15 PM CDT | Tornado Warning | LSX | Marion | 37 min |
Nearby
Flash Flood Warnings in Illinois, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.