Alert archive / Missouri / River Flood Warnings in 2025
River Flood Warning 35, NWS St. Louis, MO
NWS St. Louis, MO issued this river flood warning at Apr 21, 2025, 11:19 AM CDT for Jefferson County, Saint Louis County, Missouri. It took effect at Apr 22, 2025, 8:20 AM CDT. It was in force for 3 days.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2025, 11:19 AM CDT (16:19 UTC)
- In effect from
- Apr 22, 2025, 8:20 AM CDT
- Expired
- Apr 25, 2025, 8:00 PM CDT
- In force
- 3 days
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- Minor
Counties Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 40 km from the middle of the area, began a volume at 16:21 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 river
Written for the forecast point Meramec River at Arnold (ARNM7).
- Action stage
- 22 ft
- Minor stage
- 24 ft
- Moderate stage
- 35 ft
- Major stage
- 38 ft
This gauge today: stage, forecast and historic crests
Stage from the USGS instantaneous record for site 07019300, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.
The text
As transmitted.
004
WGUS43 KLSX 211619
FLWLSX
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service St Louis MO
1119 AM CDT Mon Apr 21 2025
...The National Weather Service in St Louis has issued a Flood
Warning for the following rivers in Missouri...
Meramec River near Arnold.
River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor
this developing situation and issue follow up statements as
conditions change.
This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx
&&
MOC099-189-230430-
/O.NEW.KLSX.FL.W.0035.250422T1320Z-250426T0100Z/
/ARNM7.1.ER.250422T1320Z.250423T1800Z.250424T1855Z.NO/
1119 AM CDT Mon Apr 21 2025
...FLOOD WARNING IN EFFECT FROM TUESDAY MORNING TO FRIDAY EVENING...
* WHAT...Minor flooding is forecast.
* WHERE...Meramec River near Arnold.
* WHEN...From Tuesday morning to Friday evening.
* IMPACTS...At 27.0 feet, Meramec Bottom Road between Wells Road and
Kerth Road begins flooding near this height.
* ADDITIONAL DETAILS...
- At 11:00 AM CDT Monday the stage was 18.7 feet.
- Forecast...The river is expected to rise above flood stage
tomorrow morning to a crest of 26.9 feet early Wednesday
afternoon. It will then fall below flood stage early Thursday
afternoon.
- Flood stage is 24.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Tue Wed Thu Fri Sat
Meramec River
Arnold 24.0 18.7 23.8 26.7 25.4 20.2 15.8
&&
LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
3841 9036 3842 9037 3843 9036 3845 9036
3845 9041
$$
Carney5 follow-up statements
196
WGUS83 KLSX 220306
FLSLSX
Flood Statement
National Weather Service St Louis MO
1006 PM CDT Mon Apr 21 2025
...The Flood Warning continues for the following rivers in
Missouri...
Meramec River near Eureka.
Meramec River at Pacific.
Big River at Byrnesville.
Meramec River near Sullivan.
Meramec River near Arnold.
Meramec River at Valley Park.
Bourbeuse River at Union.
River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor
this developing situation and issue follow up statements as
conditions change.
This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx
&&
MOC099-189-231515-
/O.EXT.KLSX.FL.W.0030.000000T0000Z-250425T0400Z/
/ERKM7.1.ER.250421T0852Z.250422T1800Z.250423T2200Z.NO/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING NOW IN EFFECT UNTIL THURSDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River near Eureka.
* WHEN...Until Thursday evening.
* IMPACTS...At 22.0 feet, Willman Road near the Highway 109 bridge
becomes inundated and impassable.
* ADDITIONAL DETAILS...
- At 9:30 PM CDT Monday the stage was 20.9 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:30 PM CDT Monday was 20.9 feet.
- Forecast...The river is expected to rise to a crest of 21.7
feet early tomorrow afternoon. It will then fall below flood
stage Wednesday afternoon.
- Flood stage is 19.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Eureka 19.0 20.9 20.8 15.7 10.3 8.2 7.2
&&
LAT...LON 3844 9064 3850 9066 3855 9064 3855 9056
3850 9056
$$
MOC071-099-231515-
/O.EXT.KLSX.FL.W.0029.000000T0000Z-250425T0036Z/
/PCFM7.1.ER.250421T1845Z.250422T1800Z.250423T1836Z.NO/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING NOW IN EFFECT UNTIL THURSDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Pacific.
* WHEN...Until Thursday evening.
* IMPACTS...At 17.0 feet, State Highway AK begins flooding near the
intersection with State Highway O near this height.
* ADDITIONAL DETAILS...
- At 9:30 PM CDT Monday the stage was 15.8 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:30 PM CDT Monday was 15.8 feet.
- Forecast...The river is expected to rise to a crest of 17.0
feet early tomorrow afternoon. It will then fall below flood
stage early Wednesday afternoon.
- Flood stage is 15.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Pacific 15.0 15.8 15.9 11.7 6.5 4.2 3.1
&&
LAT...LON 3839 9082 3839 9091 3849 9081 3850 9066
3844 9064 3843 9077
$$
MOC099-231515-
/O.EXT.KLSX.FL.W.0022.000000T0000Z-250424T0055Z/
/BYRM7.1.ER.250420T1104Z.250421T0630Z.250423T0055Z.UU/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING NOW IN EFFECT UNTIL WEDNESDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Big River at Byrnesville.
* WHEN...Until Wednesday evening.
* IMPACTS...At 18.0 feet, Cedar Hill Road at Cedar Hill and Klondike
Road south of Cedar Hill begin to flood near this height.
* ADDITIONAL DETAILS...
- At 9:45 PM CDT Monday the stage was 16.4 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:45 PM CDT Monday was 17.6 feet.
- Forecast...The river is expected to rise to a crest of 16.8
feet early tomorrow afternoon. It will then fall below flood
stage tomorrow evening.
- Flood stage is 16.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Big River
Byrnesville 16.0 16.4 13.3 8.7 7.5 6.8 6.3
&&
LAT...LON 3834 9060 3833 9068 3846 9063 3849 9057
$$
MOC055-221-231515-
/O.EXT.KLSX.FL.W.0020.000000T0000Z-250424T0000Z/
/SLLM7.1.ER.250419T2324Z.250420T1759Z.250422T1800Z.UU/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING NOW IN EFFECT UNTIL WEDNESDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River near Sullivan.
* WHEN...Until Wednesday evening.
* ADDITIONAL DETAILS...
- At 9:29 PM CDT Monday the stage was 12.9 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:29 PM CDT Monday was 14.7 feet.
- Forecast...The river is expected to fall below flood stage
early tomorrow afternoon.
- Flood stage is 11.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Sullivan 11.0 12.9 8.9 7.7 7.0 6.7 6.2
&&
LAT...LON 3801 9122 3807 9126 3816 9116 3828 9110
3832 9097 3839 9091 3839 9082 3825 9092
3823 9105 3808 9111
$$
MOC099-189-231515-
/O.EXT.KLSX.FL.W.0035.250422T1531Z-250426T0000Z/
/ARNM7.1.ER.250422T1531Z.250423T1200Z.250424T1800Z.NO/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING NOW IN EFFECT FROM TUESDAY MORNING TO FRIDAY
EVENING...
* WHAT...Minor flooding is forecast.
* WHERE...Meramec River near Arnold.
* WHEN...From Tuesday morning to Friday evening.
* IMPACTS...At 26.0 feet, Athletic fields east of I-55 begin
flooding near this height.
* ADDITIONAL DETAILS...
- At 9:30 PM CDT Monday the stage was 20.2 feet.
- Forecast...The river is expected to rise above flood stage
late tomorrow morning to a crest of 26.5 feet Wednesday
morning. It will then fall below flood stage early Thursday
afternoon.
- Flood stage is 24.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Arnold 24.0 20.2 26.5 25.2 20.1 15.7 13.4
&&
LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
3841 9036 3842 9037 3843 9036 3845 9036
3845 9041
$$
MOC099-189-231515-
/O.CON.KLSX.FL.W.0031.000000T0000Z-250425T0632Z/
/VLLM7.1.ER.250422T0007Z.250423T0600Z.250424T0032Z.NO/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE THURSDAY NIGHT...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Valley Park.
* WHEN...Until late Thursday night.
* IMPACTS...At 19.5 feet, Buder Park and the recreation park at the
water plant floods.
* ADDITIONAL DETAILS...
- At 9:30 PM CDT Monday the stage was 18.2 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:30 PM CDT Monday was 18.2 feet.
- Forecast...The river is expected to rise to a crest of 19.6
feet early Wednesday morning. It will then fall below flood
stage Wednesday evening.
- Flood stage is 18.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Valley Park 18.0 18.2 19.5 15.7 9.3 5.5 3.9
&&
LAT...LON 3850 9056 3855 9056 3857 9047 3856 9043
3853 9042 3853 9051
$$
MOC071-231515-
/O.CON.KLSX.FL.W.0026.000000T0000Z-250424T0840Z/
/UNNM7.1.ER.250421T1600Z.250422T1200Z.250423T0240Z.NO/
1006 PM CDT Mon Apr 21 2025
...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE WEDNESDAY NIGHT...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Bourbeuse River at Union.
* WHEN...Until late Wednesday night.
* IMPACTS...At 17.0 feet, Flat Creek backs up to Smeltzer's Park.
* ADDITIONAL DETAILS...
- At 9:30 PM CDT Monday the stage was 15.3 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:30 PM CDT Monday was 15.3 feet.
- Forecast...The river is expected to rise to a crest of 16.0
feet tomorrow morning. It will then fall below flood stage
late tomorrow evening.
- Flood stage is 15.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Bourbeuse River
Union 15.0 15.3 13.5 8.0 4.9 3.8 3.4
&&
LAT...LON 3826 9123 3832 9133 3838 9137 3848 9094
3842 9087
$$
Britt591
WGUS83 KLSX 221454
FLSLSX
Flood Statement
National Weather Service St Louis MO
954 AM CDT Tue Apr 22 2025
...The Flood Warning remains in effect for the following locations
along the Meramec River...
Meramec River at Valley Park.
Meramec River at Pacific.
Meramec River near Arnold.
Meramec River near Eureka.
River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor
this developing situation and issue follow up statements as
conditions change.
This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx
&&
MOC099-189-240300-
/O.EXT.KLSX.FL.W.0031.000000T0000Z-250425T0843Z/
/VLLM7.1.ER.250422T0007Z.250423T0600Z.250424T0243Z.NO/
954 AM CDT Tue Apr 22 2025
...FLOOD WARNING NOW IN EFFECT UNTIL LATE THURSDAY NIGHT...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Valley Park.
* WHEN...Until late Thursday night.
* IMPACTS...At 19.5 feet, Buder Park and the recreation park at the
water plant floods.
* ADDITIONAL DETAILS...
- At 9:30 AM CDT Tuesday the stage was 19.0 feet.
- Forecast...The river is expected to rise to a crest of 19.5
feet just after midnight tonight. It will then fall below
flood stage late tomorrow evening.
- Flood stage is 18.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Valley Park 18.0 19.0 19.5 16.1 9.2 5.6 4.6
&&
LAT...LON 3850 9056 3855 9056 3857 9047 3856 9043
3853 9042 3853 9051
$$
MOC071-099-240300-
/O.EXT.KLSX.FL.W.0029.000000T0000Z-250424T2230Z/
/PCFM7.1.ER.250421T1845Z.250422T1800Z.250423T1630Z.NO/
954 AM CDT Tue Apr 22 2025
...FLOOD WARNING NOW IN EFFECT UNTIL THURSDAY AFTERNOON...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Pacific.
* WHEN...Until Thursday afternoon.
* IMPACTS...At 16.5 feet, Opeechee Beach Road is flooded and closed.
* ADDITIONAL DETAILS...
- At 9:30 AM CDT Tuesday the stage was 16.3 feet.
- Forecast...The river is expected to rise to a crest of 16.5
feet this afternoon. It will then fall below flood stage late
tomorrow morning.
- Flood stage is 15.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Pacific 15.0 16.3 15.6 11.5 6.5 4.2 3.1
&&
LAT...LON 3839 9082 3839 9091 3849 9081 3850 9066
3844 9064 3843 9077
$$
MOC099-189-240300-
/O.EXT.KLSX.FL.W.0035.250423T0600Z-250425T1800Z/
/ARNM7.1.ER.250423T0600Z.250424T0000Z.250424T1200Z.NO/
954 AM CDT Tue Apr 22 2025
...FLOOD WARNING NOW IN EFFECT FROM LATE TONIGHT TO FRIDAY
AFTERNOON...
* WHAT...Minor flooding is forecast.
* WHERE...Meramec River near Arnold.
* WHEN...From late tonight to Friday afternoon.
* IMPACTS...At 24.7 feet, Hawkins Road south of Meramec Bottom Road
begins flooding.
* ADDITIONAL DETAILS...
- At 9:30 AM CDT Tuesday the stage was 22.2 feet.
- Forecast...The river is expected to rise above flood stage
just after midnight tonight to a crest of 24.9 feet tomorrow
evening. It will then fall below flood stage Thursday
morning.
- Flood stage is 24.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Arnold 24.0 22.2 24.4 24.0 20.1 16.2 13.9
&&
LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
3841 9036 3842 9037 3843 9036 3845 9036
3845 9041
$$
MOC099-189-240300-
/O.CON.KLSX.FL.W.0030.000000T0000Z-250425T0400Z/
/ERKM7.1.ER.250421T0852Z.250422T1800Z.250423T2200Z.NO/
954 AM CDT Tue Apr 22 2025
...FLOOD WARNING REMAINS IN EFFECT UNTIL THURSDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River near Eureka.
* WHEN...Until Thursday evening.
* IMPACTS...At 22.0 feet, Willman Road near the Highway 109 bridge
becomes inundated and impassable.
* ADDITIONAL DETAILS...
- At 9:30 AM CDT Tuesday the stage was 21.6 feet.
- Forecast...The river is expected to rise to a crest of 21.7
feet this afternoon. It will then fall below flood stage
tomorrow afternoon.
- Flood stage is 19.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Wed Thu Fri Sat Sun
Meramec River
Eureka 19.0 21.6 20.8 15.7 10.3 8.2 7.2
&&
LAT...LON 3844 9064 3850 9066 3855 9064 3855 9056
3850 9056
$$
Carney777
WGUS83 KLSX 230240
FLSLSX
Flood Statement
National Weather Service St Louis MO
940 PM CDT Tue Apr 22 2025
...The Flood Warning continues for the following rivers in
Missouri...
Meramec River at Pacific.
Meramec River at Valley Park.
Meramec River near Eureka.
...The Flood Warning is extended for the following rivers in
Missouri...
Meramec River near Arnold.
River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor
this developing situation and issue follow up statements as
conditions change.
This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx
&&
MOC071-099-241445-
/O.EXT.KLSX.FL.W.0029.000000T0000Z-250424T1800Z/
/PCFM7.1.ER.250421T1845Z.250422T1530Z.250423T1200Z.NO/
940 PM CDT Tue Apr 22 2025
...FLOOD WARNING NOW IN EFFECT UNTIL THURSDAY AFTERNOON...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Pacific.
* WHEN...Until Thursday afternoon.
* ADDITIONAL DETAILS...
- At 9:00 PM CDT Tuesday the stage was 15.9 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:00 PM CDT Tuesday was 16.5 feet.
- Forecast...The river has crested and is expected to fall
below flood stage tomorrow morning.
- Flood stage is 15.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Pacific 15.0 15.9 10.7 6.0 4.0 2.9 2.4
&&
LAT...LON 3839 9082 3839 9091 3849 9081 3850 9066
3844 9064 3843 9077
$$
MOC099-189-241445-
/O.EXT.KLSX.FL.W.0035.250423T0824Z-250425T1800Z/
/ARNM7.1.ER.250423T0824Z.250424T0000Z.250424T1200Z.NO/
940 PM CDT Tue Apr 22 2025
...FLOOD WARNING NOW IN EFFECT FROM LATE TONIGHT TO FRIDAY
AFTERNOON...
* WHAT...Minor flooding is forecast.
* WHERE...Meramec River near Arnold.
* WHEN...From late tonight to Friday afternoon.
* IMPACTS...At 24.7 feet, Hawkins Road south of Meramec Bottom Road
begins flooding.
* ADDITIONAL DETAILS...
- At 9:00 PM CDT Tuesday the stage was 23.4 feet.
- Forecast...The river is expected to rise above flood stage
late tonight to a crest of 24.9 feet tomorrow evening. It
will then fall below flood stage Thursday morning.
- Flood stage is 24.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Arnold 24.0 23.4 24.0 20.1 16.2 13.9 12.8
&&
LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
3841 9036 3842 9037 3843 9036 3845 9036
3845 9041
$$
MOC099-189-241445-
/O.CON.KLSX.FL.W.0031.000000T0000Z-250425T0843Z/
/VLLM7.1.ER.250422T0007Z.250423T0600Z.250424T0243Z.NO/
940 PM CDT Tue Apr 22 2025
...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE THURSDAY NIGHT...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Valley Park.
* WHEN...Until late Thursday night.
* ADDITIONAL DETAILS...
- At 9:00 PM CDT Tuesday the stage was 19.6 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:00 PM CDT Tuesday was 19.7 feet.
- Forecast...The river is expected to rise to a crest of 19.7
feet just after midnight tonight. It will then fall below
flood stage late tomorrow evening.
- Flood stage is 18.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Valley Park 18.0 19.6 16.1 9.2 5.6 4.6 3.9
&&
LAT...LON 3850 9056 3855 9056 3857 9047 3856 9043
3853 9042 3853 9051
$$
MOC099-189-241445-
/O.CON.KLSX.FL.W.0030.000000T0000Z-250425T0400Z/
/ERKM7.1.ER.250421T0852Z.250422T2345Z.250423T2200Z.NO/
940 PM CDT Tue Apr 22 2025
...FLOOD WARNING REMAINS IN EFFECT UNTIL THURSDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River near Eureka.
* WHEN...Until Thursday evening.
* ADDITIONAL DETAILS...
- At 9:00 PM CDT Tuesday the stage was 21.9 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:00 PM CDT Tuesday was 21.9 feet.
- Forecast...The river is cresting and is expected to fall
below flood stage tomorrow afternoon.
- Flood stage is 19.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Eureka 19.0 21.9 15.7 10.3 8.2 7.2 6.6
&&
LAT...LON 3844 9064 3850 9066 3855 9064 3855 9056
3850 9056
$$
Britt997
WGUS83 KLSX 231438
FLSLSX
Flood Statement
National Weather Service St Louis MO
938 AM CDT Wed Apr 23 2025
...The Flood Warning continues for the following locations on the
Meramec River...
Meramec River near Arnold.
Meramec River at Valley Park.
Meramec River near Eureka.
River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Rainfall heavier than forecast could cause river levels to rise even
higher than predicted. The National Weather Service will monitor
this developing situation and issue follow up statements as
conditions change.
This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx
&&
MOC099-189-250245-
/O.EXT.KLSX.FL.W.0035.000000T0000Z-250425T1600Z/
/ARNM7.1.ER.250423T0952Z.250424T0000Z.250424T1000Z.NO/
938 AM CDT Wed Apr 23 2025
...FLOOD WARNING NOW IN EFFECT UNTIL FRIDAY MORNING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River near Arnold.
* WHEN...Until Friday morning.
* IMPACTS...At 24.7 feet, Hawkins Road south of Meramec Bottom Road
begins flooding.
* ADDITIONAL DETAILS...
- At 9:00 AM CDT Wednesday the stage was 24.2 feet.
- Forecast...The river is expected to rise to a crest of 24.6
feet this evening. It will then fall below flood stage late
tonight.
- Flood stage is 24.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Arnold 24.0 24.2 23.8 19.6 15.8 13.9 12.8
&&
LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
3841 9036 3842 9037 3843 9036 3845 9036
3845 9041
$$
MOC099-189-250245-
/O.EXT.KLSX.FL.W.0031.000000T0000Z-250425T0810Z/
/VLLM7.1.ER.250422T0007Z.250423T0515Z.250424T0210Z.NO/
938 AM CDT Wed Apr 23 2025
...FLOOD WARNING NOW IN EFFECT UNTIL LATE THURSDAY NIGHT...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River at Valley Park.
* WHEN...Until late Thursday night.
* IMPACTS...At 19.5 feet, Buder Park and the recreation park at the
water plant floods.
* ADDITIONAL DETAILS...
- At 9:00 AM CDT Wednesday the stage was 19.3 feet.
- Forecast...The river is expected to fall below flood stage
late this evening and continue falling to 3.2 feet Tuesday
morning.
- Flood stage is 18.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Valley Park 18.0 19.3 16.0 9.2 6.5 5.0 3.9
&&
LAT...LON 3850 9056 3855 9056 3857 9047 3856 9043
3853 9042 3853 9051
$$
MOC099-189-250200-
/O.EXT.KLSX.FL.W.0030.000000T0000Z-250425T0150Z/
/ERKM7.1.ER.250421T0852Z.250422T2345Z.250423T1950Z.NO/
938 AM CDT Wed Apr 23 2025
...FLOOD WARNING NOW IN EFFECT UNTIL THURSDAY EVENING...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Meramec River near Eureka.
* WHEN...Until Thursday evening.
* IMPACTS...At 21.0 feet, West Spring River Road becomes inundated
at this height.
* ADDITIONAL DETAILS...
- At 9:00 AM CDT Wednesday the stage was 20.3 feet.
- Forecast...The river is expected to fall below flood stage
this afternoon and continue falling to 6.2 feet Tuesday
morning.
- Flood stage is 19.0 feet.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Thu Fri Sat Sun Mon
Meramec River
Eureka 19.0 20.3 14.6 9.9 8.5 7.6 6.9
&&
LAT...LON 3844 9064 3850 9066 3855 9064 3855 9056
3850 9056
$$
Carney699
WGUS83 KLSX 240026
FLSLSX
Flood Statement
National Weather Service St Louis MO
726 PM CDT Wed Apr 23 2025
...The Flood Warning is cancelled for the following rivers in
Missouri...
Meramec River near Arnold.
Meramec River at Valley Park.
River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.
MOC099-189-240130-
/O.CAN.KLSX.FL.W.0035.000000T0000Z-250424T0026Z/
/ARNM7.1.ER.250423T0952Z.250423T1515Z.250423T2140Z.NO/
726 PM CDT Wed Apr 23 2025
...FLOOD WARNING IS CANCELLED...
The Flood Warning is cancelled for
the Meramec River near Arnold.
* ADDITIONAL DETAILS...
- At 7:00 PM CDT Wednesday the stage was 23.8 feet.
- Forecast...No forecast is available for this location.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Fri Sat Sun Mon Tue
Meramec River
Arnold 24.0 23.8 19.6 15.8 13.9 12.8 12.1
&&
LAT...LON 3847 9044 3847 9032 3840 9033 3837 9036
3841 9036 3842 9037 3843 9036 3845 9036
3845 9041
$$
MOC099-189-240130-
/O.CAN.KLSX.FL.W.0031.000000T0000Z-250424T0026Z/
/VLLM7.1.ER.250422T0007Z.250423T0515Z.250423T2305Z.NO/
726 PM CDT Wed Apr 23 2025
...FLOOD WARNING IS CANCELLED...
The Flood Warning is cancelled for
the Meramec River at Valley Park.
* ADDITIONAL DETAILS...
- At 7:00 PM CDT Wednesday the stage was 17.8 feet.
- Forecast...No forecast is available for this location.
&&
Fld Observed Forecasts (7:00 am)
Location Stg Stage Fri Sat Sun Mon Tue
Meramec River
Valley Park 18.0 17.8 9.2 6.5 5.0 3.9 3.2
&&
LAT...LON 3850 9056 3855 9056 3857 9047 3856 9043
3853 9042 3853 9051
$$
MRBWhat forecasters said that day
The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before this river flood warning went out at Apr 21, 6:38 AM CDT, 4 hours 41 minutes earlier. Its key messages:
- Temperatures will cool to near normal (mid-60s/low-70s) today. Warmth surges back into the area Tuesday with near to above normal temperatures persisting through the remainder of the week.
- The pattern becomes active over the central U.S. from mid to late week. There is some uncertainty in precipitation potential as several weak disturbance track cross the mid-Mississippi Valley.
Area forecast discussion, Apr 21, 6:38 AM CDT, 4 hours 41 minutes before
Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 638 AM CDT Mon Apr 21 2025 .KEY MESSAGES... - Temperatures will cool to near normal (mid-60s/low-70s) today. Warmth surges back into the area Tuesday with near to above normal temperatures persisting through the remainder of the week. - The pattern becomes active over the central U.S. from mid to late week. There is some uncertainty in precipitation potential as several weak disturbance track cross the mid-Mississippi Valley. && .SHORT TERM... (Through Late Tuesday Afternoon) Issued at 248 AM CDT Mon Apr 21 2025 Low pressure continues to march off to the northeast, dragging the cold front east of the forecast area early this morning. Westerly surface winds gradually turn out of the northwest behind the departing low and associated cold front, gradually drawing cooler air into the region today. Low clouds linger behind the system thanks in part to saturation below 800 mb. HREF total cloud cover percentages show clouds breaking/clearing from west to east this morning into early afternoon. Deterministic guidance has this occurring as drier air continues to filter into the 925-850 mb layer, effectively scouring out any lingering low level saturation. Much of the region breaks out into sunshine by early to mid-afternoon with clearing occurring earlier in the day over central Missouri and locations along and east of the Mississippi River around/after 18z. HREF ensembles show a pocket of greater spread (4-6 degrees F) extending down the back side of the cloud deck, signaling minor timing difference in the speed of clearing, but quickly erodes as temperatures respond rather quickly to sunshine. Highs will range from the mid-60s (north) to the low-70s (south). Surface high pressure maintains clear skies with light winds overnight, allowing temperatures to cool into the mid/upper 40s by Tuesday morning. Low pressure tracks through the northern Plains as surface flow turns out of the south and southwest at the back side of the southeastern ridge. Milder air advects back into the region, resulting in mid-level temperatures warming around 10C Tuesday. In the process, upper level moisture increases enough to push high clouds in Tuesday afternoon. Cloud cover looks thin enough to have little impact on temperatures with highs in the mid-70s to near 80 degrees. Maples && .LONG TERM... (Tuesday Night through Sunday) Issued at 248 AM CDT Mon Apr 21 2025 The synoptic pattern gets a little more challenging as the week progresses. The northern stream system includes a trailing cold front that eventually stalls as warm air advection pushes northward. The end result is a stationary front that sets up somewhere in the vicinity of southern Iowa. Meanwhile, surface high pressure moves into the eastern Great Lakes while southeastern mid-level ridging remains fairly steady. One thing that looks a little more clear across deterministic solutions is the presence of a dry layer that is crammed between moisture along and south of the MO/AR border and moisture pooling along the stalled boundary to the north. The dry layer may hold through the first half of Wednesday, possibly longer. By Wednesday afternoon, mid/upper shortwave energy moves into the central Plains and advects moisture in from the south. Low precipitation chances (20-40 percent) were originally dispersed across a large portion of the forecast area only a couple of days ago. Chances have gradually pulled to the north and will likely continue this trend as additional data in subsequent updates get a handle on the dry layer and timing of moisture advection in the later half of the week. A series of generally west-to-east-moving shortwaves embedded in zonal flow aloft ride atop the stationary boundary that keep chance PoPs to the north at least initially. Chances increase in time as the stalled boundary is shunted southward as a corresponding surface low track northeast over northern Missouri and southern Iowa late Thursday into Friday. LREF ensemble members show the greatest spread in the forecast around this timeframe, indicating uncertainty in the where the boundary is positioned. 00z LREF data suggested the spread over the north near the boundary early Friday, expanding southward with the boundary through Friday afternoon. Shortwaves will take advantage of the increased moisture and surface boundary to give rise to scattered showers and thunderstorms in an increasingly unstable, weak flow environment. While exacting timing and rain potential is uncertain, the highest chances remain centered on Friday with the anticipation that the front drops southward through the forecast area and stalls to the south. By next weekend, surface high pressure builds southeastward as an amplified upper level ridge moves east over the central U.S. Mild or even warm conditions are favored for now. Though part of next weekend looks dry, this will be highly dependent on both the trends in the stalled front to our south and how the pattern influences the track of additional disturbance later in the weekend. Maples && .AVIATION... (For the 12z TAFs through 12z Tuesday Morning) Issued at 636 AM CDT Mon Apr 21 2025 A uniform mass of MVFR stratus covers all TAFs sites early this morning. Regional obs plots show localized, high-end IFR ceilings just south of the terminals in central Missouri. IFR looks to be the exception rather than the rule and MVFR was maintained through the prevailing groups. Dry air will gradually work into the region from the west through the morning into the early afternoon. Cloud break and continue to clear from west to east with VFR persisting through the remainder of the period once clearing commences. Maples && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous weather outlook, Apr 21, 2:49 AM CDT, 8 hours 30 minutes before
Hazardous Weather Outlook National Weather Service St Louis MO 249 AM CDT Mon Apr 21 2025 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-220800- Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- 249 AM CDT Mon Apr 21 2025 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Showers and thunderstorms are possible Tuesday night through Friday night. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Maples
In the hours before
Local storm report, Apr 21, 9:34 AM CDT, 1 hour 45 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
934 AM CDT Mon Apr 21 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM Tstm Wnd Dmg 3 SSE Belleville 38.50N 89.98W
04/20/2025 St. Clair IL Broadcast Media
Downed trees crossing IL-15.
&&
DeliaLocal storm report, Apr 21, 10:00 AM CDT, 1 hour 19 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
1000 AM CDT Mon Apr 21 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0711 AM Tstm Wnd Dmg Lesterville 37.46N 90.83W
04/20/2025 Reynolds MO 911 Call Center
Trees down one mile north of HWY 21 and HWY
U.
&&
DeliaLocal storm report, Apr 21, 11:13 AM CDT, 6 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
1113 AM CDT Mon Apr 21 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0643 PM Tstm Wnd Dmg Bourbon 38.15N 91.25W
04/20/2025 Crawford MO Law Enforcement
&&The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 7:13 PM CDT | Tornado Warning | LSX | Iron, Madison, Reynolds, Saint Francois, Washington | 47 min |
| Apr 20, 7:28 PM CDT | Tornado Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois, Washington | 37 min |
| Apr 20, 7:53 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Madison, Sainte Genevieve, Saint Francois, Saint Louis | 52 min |
| Apr 20, 7:56 PM CDT | Tornado Warning | LSX | Sainte Genevieve | 49 min |
| Apr 20, 8:19 PM CDT | Tornado Warning | LSX | Madison | 41 min |
| Apr 20, 8:53 PM CDT | River Flood Warning | LSX | Monroe | 49 hr |
| Apr 20, 8:53 PM CDT | River Flood Warning | LSX | Lincoln | 67 hr |
| Apr 20, 8:57 PM CDT | River Flood Warning | LSX | Franklin, Jefferson | 60 hr |
| Apr 20, 8:57 PM CDT | River Flood Warning | LSX | Jefferson, Saint Louis | 67 hr |
| Apr 20, 8:57 PM CDT | River Flood Warning | LSX | Jefferson, Saint Louis | 4 days |
| Apr 21, 3:47 AM CDT | River Flood Warning | LSX | Marion | 6 hr |
| Apr 21, 7:23 AM CDT | River Flood Warning | LSX | Lewis | 23 hr |
| Apr 21, 7:23 AM CDT | River Flood Warning | LSX | Lewis | 61 hr |
Nearby
River Flood Warnings in Missouri, 2025Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.