Alert archive / Illinois / Flash Flood Warnings in 2025
Flash Flood Warning 21, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 6, 2025, 4:17 PM CDT for Madison County, Saint Clair County, Illinois; City of Saint Louis, Missouri. It was in force for 3 hr. 6 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
- Jul 6, 2025, 4:17 PM CDT (21:17 UTC)
- Expired
- Jul 6, 2025, 7:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO
The radar
The St Louis radar (KLSX), 56 km from the middle of the area, began a volume at 21:19 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 |
|---|---|---|---|
| Jul 6, 5:00 PM CDT | FLASH FLOOD | 1 Se Lebanon, IL | video shows extensive standing water flooding along Madison Street including the parking lot of an Ace Hardware store. |
| Jul 6, 5:00 PM CDT | FLASH FLOOD | Lebanon, IL | A total of 4.02 inches of rain was recorded. Water was several inches deep in the back yard and flooded into the basement. |
| Jul 6, 5:15 PM CDT | RAIN 5.04 | Lebanon, IL | Within a 2.5 hour timeframe. |
| Jul 6, 5:59 PM CDT | RAIN 1.9 | Swansea, IL | |
| Jul 6, 6:00 PM CDT | FLASH FLOOD | 1 Se Lebanon, IL | Corrects time of the previous flash flood report from 1 SE Lebanon. video shows extensive standing water flooding along Madison Street including the parking lot of an Ace Hardware store. |
| Jul 6, 6:36 PM CDT | RAIN 5 | 3 N Summerfield, IL |
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, 9.3 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
- 203 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 969 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
962
WGUS53 KLSX 062117
FFWLSX
ILC119-163-MOC510-070000-
/O.NEW.KLSX.FF.W.0021.250706T2117Z-250707T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
417 PM CDT Sun Jul 6 2025
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southern Madison County in southwestern Illinois...
Northern Saint Clair County in southwestern Illinois...
Northeastern Saint Louis City in east central Missouri...
* Until 700 PM CDT.
* At 417 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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...
St. Louis, Belleville, Granite City, O'Fallon, East St. Louis,
Collinsville, Fairview Heights, Cahokia, Swansea, Glen Carbon,
Shiloh, Troy, Maryville, Mascoutah, Pontoon Beach, Centreville,
Lebanon, Caseyville, Washington Park and Madison.
This includes the following State Parks...
Horseshoe Lake State Park.
This includes Interstate 64 in Illinois between exits 9 and 27.
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 3871 9021 3873 9021 3875 9018 3874 8970
3866 8970 3866 8971 3859 8971 3849 8970
3855 9019 3860 9019 3861 9018 3864 9018
3867 9019 3869 9020 3870 9021
FLASH FLOOD...RADAR INDICATED
$$
Kimble2 follow-up statements
983
WGUS73 KLSX 062215
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
515 PM CDT Sun Jul 6 2025
MOC510-062225-
/O.CAN.KLSX.FF.W.0021.000000T0000Z-250707T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saint Louis City MO-
515 PM CDT Sun Jul 6 2025
...FLASH FLOOD WARNING IS CANCELLED FOR THE NORTHEASTERN SAINT LOUIS
CITY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
&&
LAT...LON 3854 9011 3869 9006 3874 8970 3866 8970
3866 8971 3854 8971 3849 8970
$$
ILC119-163-070000-
/O.CON.KLSX.FF.W.0021.000000T0000Z-250707T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-
515 PM CDT Sun Jul 6 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING
FOR SOUTHEASTERN MADISON AND NORTHEASTERN SAINT CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS...
At 515 PM CDT, trained weather spotters flash flooding in Lebanon
due to very heavy rainfall. Over 4 inches of rain has fallen.
Although rain is coming to an end, it will take some time for flood
waters to recede.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
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...
Belleville, O'Fallon, East St. Louis, Collinsville, Fairview
Heights, Swansea, Shiloh, Troy, Maryville, Mascoutah, Pontoon
Beach, Centreville, Lebanon, Caseyville, Washington Park, New
Baden, Scott AFB, Alorton, St. Jacob and Summerfield.
This includes Interstate 64 in Illinois between exits 9 and 27.
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 3854 9011 3869 9006 3874 8970 3866 8970
3866 8971 3854 8971 3849 8970
FLASH FLOOD...OBSERVED
$$
Kimble620
WGUS73 KLSX 062225
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
525 PM CDT Sun Jul 6 2025
ILC119-163-070000-
/O.CON.KLSX.FF.W.0021.000000T0000Z-250707T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-
525 PM CDT Sun Jul 6 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING
FOR SOUTHEASTERN MADISON AND NORTHEASTERN SAINT CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS...
At 525 PM CDT, trained weather spotters reported flash flooding in
Lebanon
due to very heavy rainfall. Over 4 inches of rain has fallen.
Although rain is coming to an end, it will take some time for flood
waters to recede.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Belleville, O'Fallon, East St. Louis, Collinsville, Fairview
Heights, Swansea, Shiloh, Troy, Maryville, Mascoutah, Pontoon
Beach, Centreville, Lebanon, Caseyville, Washington Park, New
Baden, Scott AFB, Alorton, St. Jacob and Summerfield.
This includes Interstate 64 in Illinois between exits 9 and 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3854 9011 3869 9006 3874 8970 3866 8970
3866 8971 3854 8971 3849 8970
FLASH FLOOD...OBSERVED
$$
KimbleThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 4:04 PM CDT | Areal Flood Advisory | LSX | Madison, Saint Clair | 13 min |
| Jul 6, 4:11 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 49 min |
| Jul 6, 4:46 PM CDT | Severe Thunderstorm Warning | LSX | Clinton | 25 min |
| Jul 6, 5:21 PM CDT | Flash Flood Warning | LSX | Fayette | 3 hr |
| Jul 6, 2:47 PM CDT | Areal Flood Advisory | LSX | Boone | 2 hr |
| Jul 6, 3:20 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles | 40 min |
| Jul 6, 3:54 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 19 min |
Nearby
Flash Flood Warnings in Illinois, 2025Flash Flood Warnings in Missouri, 2025Every flash flood warning in 2025
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.