River Flood Warning 59, NWS St. Louis, MO

750 
WGUS83 KLSX 301626
FLSLSX

Flood Statement
National Weather Service St Louis MO
1126 AM CDT Thu Apr 30 2026

...The Flood Warning is extended for the following rivers in
Missouri...

  Missouri River at St. Charles.

...The Flood Warning continues for the following rivers in
Missouri...

  Missouri River at Hermann.

  Missouri River near Chamois.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC183-189-020430-
/O.EXT.KLSX.FL.W.0059.000000T0000Z-260502T2000Z/
/SCLM7.1.ER.260430T1307Z.260501T0000Z.260501T1400Z.NO/
1126 AM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY AFTERNOON...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Missouri River at St. Charles.

* WHEN...Until Saturday afternoon.

* IMPACTS...At 25.0 feet, Downstream near this stage, Missouri Route
  H at Island Road and agricultural bottomland may begin flooding,
  depending on Mississippi River flow and backwater.

* ADDITIONAL DETAILS...
  - At 11:00 AM CDT Thursday the stage was 25.2 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 11:00 AM CDT Thursday was 25.2 feet.
  - Forecast...The river is expected to rise to a crest of 25.3 feet
    this evening. It will then fall below flood stage late tomorrow
    morning.
  - Flood stage is 25.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Fri   Sat   Sun   Mon   Tue

Missouri River
 St. Charles  25.0    25.2    25.1  22.9  20.0  17.8  16.4



&&

LAT...LON 3892 9036 3884 9013 3878 9016 3883 9031
      3869 9045 3860 9069 3867 9076


$$

MOC073-139-020430-
/O.EXT.KLSX.FL.W.0048.000000T0000Z-260502T1342Z/
/HRNM7.1.ER.260429T1318Z.260430T0915Z.260501T0742Z.NO/
1126 AM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Missouri River at Hermann.

* WHEN...Until Saturday morning.

* IMPACTS...At 22.3 feet, Southern portions of Old Rock Road and
  Twisters Road south of Rhineland begin flooding near this height.

* ADDITIONAL DETAILS...
  - At 10:30 AM CDT Thursday the stage was 22.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 10:30 AM CDT Thursday was 22.2 feet.
  - Forecast...The river is expected to fall below flood stage just
    after midnight tonight and continue falling to 10.4 feet
    Thursday, May 07.
  - Flood stage is 21.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Fri   Sat   Sun   Mon   Tue

Missouri River
 Hermann      21.0    22.0    20.5  17.4  14.4  12.3  11.5



&&

LAT...LON 3873 9160 3875 9136 3866 9119 3859 9119
      3867 9144 3865 9160


$$

MOC027-151-020430-
/O.CON.KLSX.FL.W.0047.000000T0000Z-260502T1200Z/
/CMSM7.1.ER.260430T0019Z.260430T1800Z.260501T0000Z.NO/
1126 AM CDT Thu Apr 30 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL SATURDAY MORNING...

* WHAT...Minor flooding is forecast.

* WHERE...Missouri River near Chamois.

* WHEN...Until Saturday morning.

* IMPACTS...At 17.0 feet, Flood Stage:  Lower lying bottom land
  begins to flood.

* ADDITIONAL DETAILS...
  - At 1:30 PM CDT Tuesday, April 28 the stage was 14.9 feet.
  - Forecast...The river is expected to rise to a crest of 17.4 feet
    this afternoon. It will then fall below flood stage this evening.
  - Flood stage is 17.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Fri   Sat   Sun   Mon   Tue

Missouri River
 Chamois      17.0    14.9    16.0  12.9  10.2  8.2   7.5



&&

LAT...LON 3864 9198 3871 9185 3873 9160 3865 9160
      3864 9181 3858 9194


$$

BRC

013 
WGUS83 KLSX 010214
FLSLSX

Flood Statement
National Weather Service St Louis MO
914 PM CDT Thu Apr 30 2026

...The Flood Warning continues for the following rivers in
Missouri...

  Missouri River at St. Charles.

  Missouri River at Hermann.

...The Flood Warning is extended for the following rivers in
Missouri...

  Missouri River near Chamois.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive cars
through flooded areas.

This product, along with additional weather and stream information,
is available at https://water.noaa.gov/wfo/lsx

&&

MOC183-189-021400-
/O.EXT.KLSX.FL.W.0059.000000T0000Z-260502T1400Z/
/SCLM7.1.ER.260430T1307Z.260430T2100Z.260501T0800Z.NO/
914 PM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Missouri River at St. Charles.

* WHEN...Until Saturday morning.

* IMPACTS...At 25.0 feet, Downstream near this stage, Missouri Route
  H at Island Road and agricultural bottomland may begin flooding,
  depending on Mississippi River flow and backwater.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Thursday the stage was 25.1 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 9:00 PM CDT Thursday was 25.2 feet.
  - Forecast...The river is expected to fall below flood stage late
    tonight and continue falling to 16.2 feet Tuesday evening.
  - Flood stage is 25.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sat   Sun   Mon   Tue   Wed

Missouri River
 St. Charles  25.0    25.1    22.4  19.9  17.9  16.5  MSG



&&

LAT...LON 3892 9036 3884 9013 3878 9016 3883 9031
      3869 9045 3860 9069 3867 9076


$$

MOC073-139-021200-
/O.EXT.KLSX.FL.W.0048.000000T0000Z-260502T1200Z/
/HRNM7.1.ER.260429T1318Z.260430T0915Z.260501T0600Z.NO/
914 PM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Missouri River at Hermann.

* WHEN...Until Saturday morning.

* IMPACTS...At 21.3 feet, The southern end of School House Road south
  of Rhineland begins flooding near this height.

* ADDITIONAL DETAILS...
  - At 8:30 PM CDT Thursday the stage was 21.4 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 8:30 PM CDT Thursday was 22.2 feet.
  - Forecast...The river is expected to fall below flood stage just
    after midnight tonight and continue falling to 10.3 feet
    Thursday, May 07.
  - Flood stage is 21.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sat   Sun   Mon   Tue   Wed

Missouri River
 Hermann      21.0    21.4    17.3  14.3  12.4  11.6  10.9



&&

LAT...LON 3873 9160 3875 9136 3866 9119 3859 9119
      3867 9144 3865 9160


$$

MOC027-151-021415-
/O.EXT.KLSX.FL.W.0047.000000T0000Z-260502T2100Z/
/CMSM7.1.ER.260430T0019Z.260430T1400Z.260501T0900Z.NO/
914 PM CDT Thu Apr 30 2026

...FLOOD WARNING NOW IN EFFECT UNTIL SATURDAY AFTERNOON...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Missouri River near Chamois.

* WHEN...Until Saturday afternoon.

* IMPACTS...At 17.0 feet, Flood Stage:  Lower lying bottom land
  begins to flood.

* ADDITIONAL DETAILS...
  - At 9:00 AM CDT Thursday the stage was 18.5 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 9:00 AM CDT Thursday was 18.5 feet. The most recent stage at
    9:00 PM CDT was estimated to be near 17.7 feet.
  - Forecast...The river is expected to fall below flood stage late
    tonight and continue falling to 7.3 feet Tuesday evening.
  - Flood stage is 17.0 feet.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sat   Sun   Mon   Tue

Missouri River
 Chamois      17.0    17.7E   13.5  10.5  8.5   7.7

E= Estimated Stage


&&

LAT...LON 3864 9198 3871 9185 3873 9160 3865 9160
      3864 9181 3858 9194


$$

Maples

977 
WGUS83 KLSX 010935
FLSLSX

Flood Statement
National Weather Service St Louis MO
435 AM CDT Fri May 1 2026

...The Flood Warning is cancelled for the following rivers in
Missouri...

  Missouri River at St. Charles.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

MOC183-189-011045-
/O.CAN.KLSX.FL.W.0059.000000T0000Z-260501T0935Z/
/SCLM7.1.ER.260430T1307Z.260430T2100Z.260501T0700Z.NO/
435 AM CDT Fri May 1 2026

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Missouri River at St. Charles.

* ADDITIONAL DETAILS...
  - At 4:30 AM CDT Friday the stage was 24.9 feet.
  - Forecast...The river is expected to fall to 16.2 feet Tuesday
    evening.



&&


All Times CDT Fld   Observed  Forecasts (7:00 am)
Location      Stg     Stage   Sat   Sun   Mon   Tue   Wed

Missouri River
 St. Charles  25.0    24.9    22.4  19.9  17.9  16.5  MSG



&&

LAT...LON 3892 9036 3884 9013 3878 9016 3883 9031
      3869 9045 3860 9069 3867 9076


$$

Elmore

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
431 AM CDT Thu Apr 30 2026

.KEY MESSAGES...

-There is a 30-60% chance for showers and a thunderstorm or two this
afternoon and early evening.

-Seasonably cool temperatures will continue through Saturday, near
 normal temperatures and rain chances return Sunday through mid-
 week.

&&

.SHORT TERM...  (Through Late Friday Afternoon)
Issued at 234 AM CDT Thu Apr 30 2026

The center of the broad mid-level trough has shifted into the Great
Lakes region and will send another disturbance through the northwest
flow into the mid-Mississippi Valley. This feature will generate
showers and a few thunderstorms along a southward sinking cold front
this afternoon into the evening. Poor mid-level lapse rates will
limit instability, illustrated by the HREF max SBCAPE, which peaks
around 200 J/kg along and north of I-70 during the afternoon. This
will limit thunderstorm development and keep the region free from
severe thunderstorms. Temperatures will peak in the 60s today,
within a degree or two of yesterday.

The front will bring another surge of below normal air into the
region overnight into Friday, cooling 850 mb temperatures to near 0-
2C. This will result in even cooler high temperatures Friday,
peaking in the upper 50s to low 60s. Another surface boundary will
drop south through the region Friday afternoon, driven aloft by yet
another mid-level disturbance, with a 20% chance of producing
light showers north of I-70.

Delia

&&

.LONG TERM...  (Friday Night through Wednesday)
Issued at 234 AM CDT Thu Apr 30 2026

A broad surface high will push through the region Friday night into
Saturday, supporting efficient radiational cooling. Combined with
the cool airmass in place across the region, Saturday morning's lows
will be some of the coolest this period. Portions of northeast
Missouri, west-central Illinois, and the hollows of the Ozarks are
at greatest risk for light frost Saturday morning, with a 30-50%
chance of lows 36F or lower.

Ensemble guidance is coming into agreement that another mid-level
low will surge southward and Fujiwara with the center of the mid-
level trough, resulting in a very broad trough that covers the
eastern two thirds of the CONUS for the first half of next week. At
the beginning of the work week a mid-level disturbance will move
through the southern periphery of the trough into the mid-
Mississippi Valley. The resulting surface low will form on the lee-
side of the Rockies and push eastward through the Mississippi
Valley. Guidance is starting to key in on showers and thunderstorms
forming in association with this low and it's associated warm front
Tuesday into Wednesday.

Guidance diverges in how to handle the surface pattern beyond the
passage of this feature, though as the region remains on the
southern periphery of the mid-level trough, multiple chances for
showers and thunderstorms are possible through the end of the period.

Temperatures will return to near normal values starting Sunday as
the low-level flow becomes southwesterly, advecting warm air back
into the region. Confidence is high that these near normal
temperatures will last through the first portion of the week, but
the passage of the mid-week system has the potential bring cooler
temperatures back to the area.

Delia

&&

.AVIATION...  (For the 12z TAFs through 12z Friday Morning)
Issued at 426 AM CDT Thu Apr 30 2026

River valley fog has formed along and south of the Missouri River,
impacting KSUS and KJEF. This fog will lift with sunrise and the
onset of daytime mixing. Showers and a thunderstorm or two will
move through the forecast area along a southward moving cold front
this afternoon into the evening. The best chance for rain is at
KUIN, with lower confidence further south. Confidence is low in
thunderstorm development, so have left the mention of TSRA out of
the TAFs entirely for the moment.

Westerly winds will become northwesterly behind the front, and
then light and variable as a surface high moves back into the
region overnight.

Delia

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&

WFO LSX

Hazardous Weather Outlook
National Weather Service St Louis MO
355 PM CDT Wed Apr 29 2026

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-302100-
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-
355 PM CDT Wed Apr 29 2026

This Hazardous Weather Outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAYS ONE THROUGH SEVEN...This afternoon through Tuesday.

More detailed information can be accessed at:
https://www.weather.gov/media/lsx/DssPacket.pdf

The Area Forecast Discussion is available at:
https://forecast.weather.gov/
product.php?issuedby=LSX&product=AFD&site=lsx

.KEY MESSAGES...

-Rain chances have increased into the 20-50% range late Thursday
 into Thursday night over parts of the area as a cold font moves
 through.

-Temperatures will continue to be below normal through Saturday
 before a warming trend starts on Sunday.

NOTE: Starting May 29, 2026, the Hazardous Weather Outlook will be
discontinued. Please see the above products for more detailed
forecast information.

WFO LSX