Alert archive / Missouri / Flash Flood Warnings in 2025
Flash Flood Warning 49, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 12, 2025, 6:06 PM CDT for Franklin County, Jefferson County, Missouri. It was in force for 98 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2025, 6:06 PM CDT (23:06 UTC)
- Expired
- Aug 12, 2025, 7:44 PM CDT
- In force
- 98 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Franklin County, MO, Jefferson County, MO
The radar
The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 23:06 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, 11.1 hours before the alert went out and 261 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
- 738 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1235 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
569
WGUS53 KLSX 122306
FFWLSX
MOC071-099-130200-
/O.NEW.KLSX.FF.W.0049.250812T2306Z-250813T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
606 PM CDT Tue Aug 12 2025
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
East Central Franklin County in east central Missouri...
Northwestern Jefferson County in east central Missouri...
* Until 900 PM CDT.
* At 606 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3.5 inches of
rain have fallen. Additional rainfall amounts of 0.5 to 1.5 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...
Eureka, Pacific, Byrnes Mill, Cedar Hill, High Ridge, Murphy,
Cedar Hill Lakes, Dittmer, House Springs, Scotsdale, Parkdale,
Catawissa and Robertsville.
This includes the following State Parks...
Robertsville State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3832 9088 3847 9081 3849 9074 3847 9074
3848 9073 3848 9072 3847 9072 3847 9070
3845 9069 3846 9068 3844 9069 3846 9065
3848 9066 3849 9065 3849 9063 3847 9062
3848 9060 3850 9059 3850 9051 3830 9057
FLASH FLOOD...RADAR INDICATED
$$
191 follow-up statement
577
WGUS73 KLSX 130044
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
744 PM CDT Tue Aug 12 2025
MOC071-099-130054-
/O.CAN.KLSX.FF.W.0049.000000T0000Z-250813T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-Jefferson MO-
744 PM CDT Tue Aug 12 2025
...FLASH FLOOD WARNING FOR EAST CENTRAL FRANKLIN AND NORTHWESTERN
JEFFERSON COUNTIES HAS BEEN REPLACED WITH A FLOOD ADVISORY...
The heavy rain has ended. Minor flooding may continue in poor
drainage areas. Please continue to heed remaining road closures.
&&
LAT...LON 3847 9081 3849 9074 3847 9074 3848 9073
3848 9072 3847 9072 3847 9070 3845 9069
3846 9068 3844 9069 3846 9065 3848 9066
3849 9065 3849 9063 3847 9062 3848 9060
3850 9059 3850 9051 3830 9057 3832 9088
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:48 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Saint Louis, City of Saint Louis | 55 min |
| Aug 12, 3:43 PM CDT | Flash Flood Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 105 min |
| Aug 12, 5:28 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Saint Louis, City of Saint Louis | 62 min |
| Aug 12, 5:36 PM CDT | Areal Flood Advisory | LSX | Franklin, Jefferson | 25 min |
| Aug 12, 6:01 PM CDT | Areal Flood Warning | LSX | Franklin, Jefferson | 5 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.