Alert archive / Missouri / Flash Flood Warnings in 2025
Flash Flood Warning 2, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Apr 4, 2025, 3:42 PM CDT for Saint Charles County, Warren County, Missouri. It was in force for 4 hr. 8 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
- Apr 4, 2025, 3:42 PM CDT (20:42 UTC)
- Expired
- Apr 4, 2025, 8:05 PM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 23 km from the middle of the area, began a volume at 20:42 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 |
|---|---|---|---|
| Apr 4, 4:05 PM CDT | RAIN 1.32 | 1 Sw Warrenton, MO | |
| Apr 4, 4:09 PM CDT | FLASH FLOOD | 2 Ne Wright City, MO | Highway J at BMC Stone quarry flooded. This spot typically floods when heavy rain falls. |
| Apr 4, 4:09 PM CDT | FLASH FLOOD | 2 Nnw Marthasville, MO | Highway O at Walnut Crest flooded. This spot typically floods when heavy rain falls. |
| Apr 4, 4:09 PM CDT | FLASH FLOOD | 3 Ssw Foristell, MO | Schreckengast Road at Cedar Lake Cellars flooded. This spot typically floods when heavy rain falls. |
| Apr 4, 4:09 PM CDT | FLASH FLOOD | 5 Se Truesdale, MO | Highway F at S Stracks Church Road flooded. This spot typically floods when heavy rain falls. |
| Apr 4, 4:41 PM CDT | FLASH FLOOD | 3 N Saint Paul, MO | A couple of calls into EOC about heavy flooding on MO-79 north of Dalbow Road. Extent of actual flooding is unknown. |
| Apr 4, 5:48 PM CDT | FLOOD | 1 S O'Fallon, MO | Report from mPING: River/Creek overflowing; Cropland/Yard/Basement Flooding. |
| Apr 4, 7:20 PM CDT | RAIN 3.02 | 1 E Saint Peters, MO | Still rain to come. |
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, 8.7 hours before the alert went out and 253 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
- 1306 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 211 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
487
WGUS53 KLSX 042042
FFWLSX
MOC183-219-042345-
/O.NEW.KLSX.FF.W.0002.250404T2042Z-250404T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
342 PM CDT Fri Apr 4 2025
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Saint Charles County in east central Missouri...
Warren County in east central Missouri...
* Until 645 PM CDT.
* At 342 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 3 inches are
possible in 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...
O'Fallon, St. Peters, Chesterfield, Wildwood, Wentzville, Lake St.
Louis, Dardenne Prairie, Warrenton, Weldon Spring, Wright City,
Cottleville, St. Paul, Marthasville, Truesdale, Innsbrook, New
Melle, Josephville, Augusta, Weldon Spring Heights and Dutzow.
This includes Interstate 70 in Missouri between exits 193 and 224.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3862 9122 3865 9123 3871 9132 3871 9140
3888 9111 3887 9096 3889 9095 3888 9082
3892 9078 3893 9073 3892 9073 3891 9072
3893 9067 3887 9059 3868 9058 3869 9066
3861 9076 3854 9092 3861 9106 3860 9113
FLASH FLOOD...RADAR INDICATED
$$
Walsh3 follow-up statements
064
WGUS53 KLSX 042301
FFWLSX
MOC183-219-050045-
/O.EXT.KLSX.FF.W.0002.000000T0000Z-250405T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
601 PM CDT Fri Apr 4 2025
The National Weather Service in St Louis has extended the
* Flash Flood Warning for...
Saint Charles County in east central Missouri...
Warren County in east central Missouri...
* Until 745 PM CDT.
* At 601 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts up to 1 inch are possible
in the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
O'Fallon, St. Peters, Chesterfield, Wildwood, Wentzville, Lake St.
Louis, Dardenne Prairie, Warrenton, Weldon Spring, Wright City,
Cottleville, St. Paul, Marthasville, Truesdale, Innsbrook, New
Melle, Josephville, Augusta, Weldon Spring Heights and Dutzow.
This includes Interstate 70 in Missouri between exits 193 and 224.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3862 9122 3865 9123 3871 9132 3871 9140
3888 9111 3887 9096 3889 9095 3888 9082
3892 9078 3893 9073 3892 9073 3891 9072
3893 9067 3887 9059 3868 9058 3869 9066
3861 9076 3854 9092 3861 9106 3860 9113
FLASH FLOOD...RADAR INDICATED
$$
Walsh990
WGUS53 KLSX 042359
FFWLSX
MOC183-219-050145-
/O.EXT.KLSX.FF.W.0002.000000T0000Z-250405T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
659 PM CDT Fri Apr 4 2025
The National Weather Service in St Louis has extended the
* Flash Flood Warning for...
Saint Charles County in east central Missouri...
Warren County in east central Missouri...
* Until 845 PM CDT.
* At 659 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts up to 1 inch are possible
in 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...
O'Fallon, St. Peters, Chesterfield, Wildwood, Wentzville, Lake St.
Louis, Dardenne Prairie, Warrenton, Weldon Spring, Wright City,
Cottleville, St. Paul, Marthasville, Truesdale, Innsbrook, New
Melle, Josephville, Augusta, Weldon Spring Heights and Dutzow.
This includes Interstate 70 in Missouri between exits 193 and 224.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3862 9122 3865 9123 3871 9132 3871 9140
3888 9111 3887 9096 3889 9095 3888 9082
3892 9078 3893 9073 3892 9073 3891 9072
3893 9067 3887 9059 3868 9058 3869 9066
3861 9076 3854 9092 3861 9106 3860 9113
FLASH FLOOD...RADAR INDICATED
$$
Walsh607
WGUS73 KLSX 050105
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
805 PM CDT Fri Apr 4 2025
MOC183-219-050115-
/O.CAN.KLSX.FF.W.0002.000000T0000Z-250405T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saint Charles MO-Warren MO-
805 PM CDT Fri Apr 4 2025
...FLASH FLOOD WARNING IS CANCELLED FOR SAINT CHARLES AND WARREN
COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 100 AM CDT Sunday for portions
of Illinois and Missouri.
&&
LAT...LON 3862 9122 3865 9123 3871 9132 3871 9140
3888 9111 3887 9096 3889 9095 3888 9082
3892 9078 3893 9073 3892 9073 3891 9072
3893 9067 3887 9059 3868 9058 3869 9066
3861 9076 3854 9092 3861 9106 3860 9113
$$
WalshThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 8:05 PM CDT | River Flood Warning | LSX | Saint Charles | 3 days |
| Apr 4, 2:25 PM CDT | Flash Flood Warning | LSX | Franklin, Gasconade, Osage | 3 hr |
| Apr 4, 2:48 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Warren | 54 min |
| Apr 4, 3:36 PM CDT | Areal Flood Advisory | LSX | Franklin, Saint Charles, Saint Louis, City of Saint Louis | 2 hr |
| Apr 4, 3:37 PM CDT | Areal Flood Advisory | LSX | Lincoln, Saint Charles | 3 hr |
| Apr 4, 4:18 PM CDT | Flash Flood Warning | LSX | Franklin, Saint Louis | 4 hr |
| Apr 4, 4:51 PM CDT | River Flood Warning | LSX | Osage | 27 hr |
| Apr 4, 5:33 PM CDT | Areal Flood Advisory | LSX | Iron, Reynolds | 51 min |
| Apr 4, 5:45 PM CDT | Flash Flood Warning | LSX | Franklin, Saint Charles, Saint Louis, City of Saint Louis | 3 hr |
| Apr 4, 5:49 PM CDT | Areal Flood Advisory | LSX | Saint Francois, Washington | 38 min |
| Apr 4, 6:08 PM CDT | Areal Flood Advisory | LSX | Sainte Genevieve, Saint Francois | 20 min |
| Apr 4, 6:18 PM CDT | Areal Flood Advisory | LSX | City of Saint Louis | 3 hr |
| Apr 4, 6:24 PM CDT | Flash Flood Warning | LSX | Iron, Madison, Reynolds | 5 hr |
| Apr 4, 6:26 PM CDT | Flash Flood Warning | LSX | Madison, Saint Francois | 5 hr |
| Apr 4, 6:27 PM CDT | Flash Flood Warning | LSX | Saint Francois, Washington | 5 hr |
| Apr 4, 6:28 PM CDT | Flash Flood Warning | LSX | Sainte Genevieve, Saint Francois | 7 hr |
| Apr 4, 6:51 PM CDT | Flash Flood Warning | LSX | Jefferson | 7 hr |
Nearby
Flash 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.