River Flood Warning 53, NWS St. Louis, MO

345 
WGUS83 KLSX 290248
FLSLSX

Flood Statement
National Weather Service St Louis MO
948 PM CDT Tue Apr 28 2026

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

  Illinois River at La Grange LD.

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

  Kaskaskia River at Vandalia.

  Illinois River at Valley City.

  Illinois River at Hardin.

  Illinois River at Meredosia.

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.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

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

&&

ILC009-301500-
/O.EXT.KLSX.FL.W.0053.260430T0300Z-260505T1200Z/
/NLGI2.1.ER.260430T0300Z.260501T0600Z.260504T0600Z.NO/
948 PM CDT Tue Apr 28 2026

...FLOOD WARNING NOW IN EFFECT FROM WEDNESDAY EVENING TO TUESDAY
MORNING...

* WHAT...Minor flooding is forecast.

* WHERE...Illinois River at La Grange LD.

* WHEN...From Wednesday evening to Tuesday morning.

* IMPACTS...At 23.0 feet, Adjacent farmland and wetlands begins
  flooding.  Island Road across the river in western Cass County
  begins flooding.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Tuesday the stage was 22.1 feet.
  - Forecast...The river is expected to rise above flood stage late
    tomorrow evening to a crest of 23.4 feet early Friday morning. It
    will then fall below flood stage early Monday morning.
  - Flood stage is 23.0 feet.



&&


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

Illinois River
 La Grange LD 23.0    22.1    23.2  23.4  23.4  23.2  22.9



&&

LAT...LON 3999 9058 3999 9046 3988 9043 3988 9063


$$

ILC051-301500-
/O.CON.KLSX.FL.W.0042.000000T0000Z-260503T0350Z/
/VNDI2.3.ER.260428T0624Z.260429T1800Z.260501T2150Z.NO/
948 PM CDT Tue Apr 28 2026

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

* WHAT...Moderate flooding is occurring and major flooding is
  forecast.

* WHERE...Kaskaskia River at Vandalia.

* WHEN...Until Saturday evening.

* IMPACTS...At 26.0 feet, The Dively and Vandalia Levees begin to be
  overtopped.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Tuesday the stage was 24.8 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 9:30 PM CDT Tuesday was 24.8 feet.
  - Forecast...The river is expected to rise to a crest of 26.1 feet
    early tomorrow afternoon. It will then fall below flood stage
    Friday afternoon.
  - Flood stage is 18.0 feet.
  - Flood History...This crest compares to a previous crest of 26.1
    feet on 04/24/1944.



&&


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

Kaskaskia River
 Vandalia      18.0    24.8    25.2  21.4  13.9  10.1  8.2



&&

LAT...LON 3903 8910 3903 8906 3889 8908 3881 8916
      3883 8922


$$

ILC149-171-301500-
/O.CON.KLSX.FL.W.0041.000000T0000Z-000000T0000Z/
/VALI2.1.ER.260428T0056Z.260501T1200Z.000000T0000Z.NO/
948 PM CDT Tue Apr 28 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

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

* WHERE...Illinois River at Valley City.

* WHEN...Until further notice.

* IMPACTS...At 14.0 feet, The road to Norbut Fish and Wildlife area
  is flooded.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Tuesday the stage was 14.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 9:30 PM CDT Tuesday was 14.7 feet.
  - Forecast...The river is expected to rise to a crest of 15.9 feet
    Friday morning.
  - Flood stage is 14.0 feet.



&&


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

Illinois River
 Valley City  14.0    14.7    15.3  15.9  15.8  15.6  15.2



&&

LAT...LON 3977 9067 3977 9053 3969 9056 3962 9052
      3952 9051 3952 9059 3964 9062 3965 9066
      3967 9065


$$

ILC013-061-083-301500-
/O.CON.KLSX.FL.W.0025.000000T0000Z-000000T0000Z/
/HARI2.1.ER.260418T2200Z.260501T1200Z.000000T0000Z.NO/
948 PM CDT Tue Apr 28 2026

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

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

* WHERE...Illinois River at Hardin.

* WHEN...Until further notice.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Tuesday the stage was 27.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours ending
    at 9:30 PM CDT Tuesday was 27.7 feet.
  - Forecast...The river is expected to rise to a crest of 29.2 feet
    Friday morning.
  - Flood stage is 25.0 feet.



&&


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

Illinois River
 Hardin       25.0    27.7    28.7  29.2  29.2  28.5  28.0



&&

LAT...LON 3952 9064 3952 9052 3942 9054 3935 9051
      3931 9053 3898 9052 3897 9049 3890 9054
      3898 9062 3923 9065


$$

ILC137-149-301500-
/O.CON.KLSX.FL.W.0054.260430T0600Z-260506T0600Z/
/MROI2.1.ER.260430T0600Z.260502T0000Z.260505T0000Z.NO/
948 PM CDT Tue Apr 28 2026

...FLOOD WARNING REMAINS IN EFFECT FROM LATE WEDNESDAY NIGHT TO
WEDNESDAY, MAY 06...

* WHAT...Minor flooding is forecast.

* WHERE...Illinois River at Meredosia.

* WHEN...From late Wednesday night to Wednesday, May 06.

* IMPACTS...At 17.4 feet, Meredosia boat dock floods.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Tuesday the stage was 16.2 feet.
  - Forecast...The river is expected to rise above flood stage early
    Thursday morning to a crest of 17.8 feet Friday evening. It will
    then fall below flood stage Monday evening.
  - Flood stage is 17.0 feet.



&&


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

Illinois River
 Meredosia    17.0    16.2    17.2  17.6  17.8  17.7  17.3



&&

LAT...LON 3988 9063 3988 9043 3982 9050 3977 9053
      3977 9067 3984 9066


$$

Jaja

322 
WGUS83 KLSX 291718
FLSLSX

Flood Statement
National Weather Service St Louis MO
1218 PM CDT Wed Apr 29 2026

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

  Illinois River at La Grange LD.

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

ILC009-291830-
/O.CAN.KLSX.FL.W.0053.260430T0300Z-260429T1718Z/
/NLGI2.1.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1218 PM CDT Wed Apr 29 2026

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Illinois River at La Grange LD.

* ADDITIONAL DETAILS...
  - At 11:00 AM CDT Wednesday the stage was 22.3 feet.
  - Forecast...The river is still expected to rise to a crest of 22.8
    feet early Friday afternoon, but just short of flood stage.



&&


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

Illinois River
 La Grange LD 23.0    22.3    22.6  22.7  22.8  22.8  22.7



&&

LAT...LON 3999 9058 3999 9046 3988 9043 3988 9063


$$

19

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
430 AM CDT Tue Apr 28 2026

.KEY MESSAGES...

-There is 40-80% chance for showers and thunderstorms this afternoon
and evening, a few may be strong to severe across southeast Missouri
and southern Illinois this afternoon.

-The remainder of the work week will be seasonally cool and
 largely dry.

&&

.SHORT TERM...  (Through Late Wednesday Afternoon)
Issued at 328 AM CDT Tue Apr 28 2026

Yesterday's cold front is now stretched KHRO in northwest Arkansas
through southeast Missouri to near K1H2 in central Illinois. While
this feature will continue to sink southward through the morning
hours, an approaching mid-level shortwave and strong southerly low-
level flow will cause the front to stall this afternoon near the
Missouri-Arkansas border. Showers and thunderstorms will blossom
north of the front across the forecast area this afternoon from the
influence of the shortwave and warm air advection overriding the
surface front.

A few thunderstorms across southeast Missouri and southern Illinois
could become strong to severe between 2-8 PM today, though
uncertainty remains in if the ingredients will be present for these
storms to organize and maintain themselves. Instability is our
limiting factor thanks to a 800-700 mb warm nose that will be
reinforced by the ongoing warm air advection. The HREF indicates
that around 750 J/kg of MUCAPE will be available across far
southeast Missouri, though the 50-60 kts of 0-6 km shear may be too
strong to balance this low amount of instability. Storms in this
environment have the potential to shear out before producing severe
impacts. Any storms that form from this elevated instability and
become sufficiently strong will be capable of quarter sized hail.
SBCAPE is at even more of a premium due to the anticipated warm
nose, yet the HREF indicates as much as 1000 J/kg (worst case
scenario). If this surface based instability is realized and storms
are able to remain organized, damaging winds and hail will be the
main threats. Tornadoes are not anticipated to form from these
storms due to very weak low-level shear.

The mid-level shortwave will exit the area tonight, and combined
with an incoming surface high, will push showers and thunderstorms
eastward into the Ohio River Valley. At the same time, a low-level
secondary cold front will slowly slide through the forecast area
early Wednesday. The combination of these factors will result in a
dry and seasonally cool day with temperatures peaking in the 60s
areawide.

Delia

&&

.LONG TERM...  (Wednesday Night through Monday)
Issued at 328 AM CDT Tue Apr 28 2026

Heading into the second half of the work week the 500 mb flow will
start to shift from its previously stagnant pattern. By Thursday the
mid-level low will be churning over the Great Lakes region, having
moved eastward from south-central Canada, though the mid-Mississippi
Valley will remain in northwest flow. At the surface a weak frontal
boundary will be stretched across the central CONUS, bisecting a
portion of the forecast area. Lift along the front as well as aloft
will be weak, so despite ensemble guidance indicating about a 40%
chance for showers along the front Thursday, confidence is low in
widespread, significant precipitation.

Another, more robust mid-level shortwave will push through the mid-
Mississippi Valley Friday as the mid-level low shifts east out of
the Great Lakes region. At the same time a mid-level ridge will
build into the Intermountain West, leaving the mid-Mississippi
Valley in strong northwest flow in the wake of the shortwave. This
flow will prevail through the end of the weekend, and extends down
to the low-levels, where 850 mb temperatures will cool into the 10th
percentile through Saturday. Seasonally cool temperatures with highs
in the 60s will persist through Saturday as a result. By Sunday the
low-level flow will become more westerly, advecting the thermal
ridge into the area and kicking off a clear warming trend that is
evident in the interquartile high temperature spread. The 25th
percentile jumps from 60-70 between Saturday and Sunday, though the
interquartile spread is about 6-10 degrees from the weekend onward.
This uncertainty is due to uncertainty in the evolution of the mid-
level and surface pattern beyond Sunday. Ensemble guidance shows
chances for precipitation returning to the region for next week,
though specifics remain elusive at this point.

Delia

&&

.AVIATION...  (For the 12z TAFs through 12z Wednesday Morning)
Issued at 416 AM CDT Tue Apr 28 2026

An MVFR stratus deck has moved into the region in the wake of
yesterday's precipitation and cold front. It's currently impacting
KUIN, KCOU, and KJEF with MVFR flight conditions. The southeastern
edge of the stratus is right over KSTL and KSUS, causing the
terminals to scatter between 3,000-3,800 ft. Uncertainty remains
in if the stratus will progress southeast as guidance indicates,
or if it will stall in it's current location as observations are
pointing toward. I've leaned towards the observations within the
forecast and put VFR ceilings in at KSTL, KSUS, and KCPS. The MVFR
stratus is expected to lift during the late morning into early
afternoon, bringing all terminals to VFR flight conditions.

Showers and thunderstorms will move through the region this
afternoon into the evening hours, impacting mainly the mid-
Missouri (KJEF, KCOU) and St. Louis metro terminals (KSTL, KSUS,
KCPS). Confidence is lower in showers making it into KUIN, so
have kept showers out of this terminal for the moment. Showers and
thunderstorms will come to an end overnight, leaving conditions
dry for the remainder of the forecast. MVFR ceilings are expected
to move into the St. Louis metro terminals during the evening with
the showers and thunderstorms, though it is expected to be rather
progressive as another surface high pressure moves into the
region and shunts the MVFR stratus to the east with the
precipitation.

Delia

&&

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

WFO LSX

Hazardous Weather Outlook
National Weather Service St Louis MO
946 PM CDT Mon Apr 27 2026

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-290300-
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-
946 PM CDT Mon Apr 27 2026

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

There is a chance of thunderstorms Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Jaja

Preliminary Local Storm Report
National Weather Service St Louis MO
928 AM CDT Tue Apr 28 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     Tstm Wnd Dmg     Hamel                   38.89N 89.84W
04/27/2026                   Madison            IL   Newspaper

            Large tree limb blown down onto house.

&&

Carney

Preliminary Local Storm Report
National Weather Service St Louis MO
1016 AM CDT Tue Apr 28 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0620 PM     Tstm Wnd Dmg     Medora                  39.18N 90.14W
04/27/2026                   Macoupin           IL   Emergency Mngr

            Shed collapsed.

&&

Carney

Preliminary Local Storm Report
National Weather Service St Louis MO
1104 AM CDT Tue Apr 28 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0810 PM     Tstm Wnd Dmg     Ellington               37.24N 90.97W
04/27/2026                   Reynolds           MO   Law Enforcement

            Trees blown down in Ellington.

&&

Carney

Preliminary Local Storm Report
National Weather Service St Louis MO
1124 AM CDT Tue Apr 28 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0835 PM     Tstm Wnd Dmg     Centralia               38.52N 89.13W
04/27/2026                   Marion             IL   Emergency Mngr

            Power poles and tree damage.

&&

Carney