Severe Thunderstorm Warning 96, NWS St. Louis, MO

902 
WWUS53 KLSX 272031
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
331 PM CDT Mon Apr 27 2026

ILC013-061-083-119-MOC183-189-272100-
/O.CON.KLSX.SV.W.0096.000000T0000Z-260427T2100Z/
Calhoun IL-Greene IL-Jersey IL-Madison IL-Saint Charles MO-Saint
Louis MO-
331 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 4 PM CDT FOR
SOUTHEASTERN CALHOUN, SOUTHEASTERN GREENE, JERSEY AND NORTHWESTERN
MADISON COUNTIES IN SOUTHWESTERN ILLINOIS AND NORTHEASTERN SAINT
CHARLES AND NORTH CENTRAL SAINT LOUIS COUNTIES IN EAST CENTRAL
MISSOURI...

At 331 PM CDT, a severe thunderstorm was located over Elsah, or 8
miles west of Godfrey, moving east at 50 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
  St. Peters, St. Charles, Hazelwood, Bridgeton, Orchard Farms,
  Florissant, Grafton, Elsah, Portage Des Sioux, West Alton, Old
  Kane, Godfrey, Jerseyville, Alton, East Alton, Wood River and
  Rosewood Heights.

This includes the following State Parks...
Pere Marquette State Park.

This includes Interstate 70 in Missouri between exits 224 and 227.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.

A Tornado Watch remains in effect until 900 PM CDT for portions of
southwest Illinois and east central Missouri.

&&

LAT...LON 3888 9061 3906 9064 3914 9056 3932 9027
      3904 9015 3902 9015 3900 9014 3900 9013
      3885 9006 3877 9059
TIME...MOT...LOC 2014Z 251DEG 43KT 3891 9061

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

937 
WWUS53 KLSX 272036
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
336 PM CDT Mon Apr 27 2026

ILC013-061-083-119-MOC183-189-272100-
/O.CON.KLSX.SV.W.0096.000000T0000Z-260427T2100Z/
Calhoun IL-Greene IL-Jersey IL-Madison IL-Saint Charles MO-Saint
Louis MO-
336 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 4 PM CDT FOR
SOUTHEASTERN CALHOUN, SOUTHEASTERN GREENE, JERSEY AND NORTHWESTERN
MADISON COUNTIES IN SOUTHWESTERN ILLINOIS AND NORTHEASTERN SAINT
CHARLES AND NORTH CENTRAL SAINT LOUIS COUNTIES IN EAST CENTRAL
MISSOURI...

At 336 PM CDT, a severe thunderstorm was located over Elsah, or 6
miles west of Godfrey, moving east at 50 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
  St. Charles, Bridgeton, Hazelwood, Orchard Farms, Florissant,
  Grafton, Elsah, Portage Des Sioux, West Alton, Old Kane, Godfrey,
  Jerseyville, Kane, Alton, Wood River, East Alton and Rosewood
  Heights.

This includes the following State Parks...
Pere Marquette State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.

A Tornado Watch remains in effect until 900 PM CDT for portions of
southwest Illinois and east central Missouri.

&&

LAT...LON 3896 9054 3912 9058 3914 9056 3932 9027
      3904 9015 3901 9015 3900 9014 3900 9013
      3885 9006 3878 9049
TIME...MOT...LOC 2031Z 252DEG 41KT 3896 9039

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

368 
WWUS53 KLSX 272048
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
348 PM CDT Mon Apr 27 2026

ILC013-272058-
/O.CAN.KLSX.SV.W.0096.000000T0000Z-260427T2100Z/
Calhoun IL-
348 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHEASTERN CALHOUN
COUNTY...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for a portion of
southwest Illinois.

&&

LAT...LON 3916 9050 3917 9050 3932 9027 3904 9015
      3901 9015 3900 9014 3900 9013 3885 9006
      3880 9036
TIME...MOT...LOC 2036Z 252DEG 41KT 3898 9032

$$


ILC061-083-119-MOC183-189-272100-
/O.CON.KLSX.SV.W.0096.000000T0000Z-260427T2100Z/
Greene IL-Jersey IL-Madison IL-Saint Charles MO-Saint Louis MO-
348 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 4 PM CDT FOR
SOUTHEASTERN GREENE, JERSEY AND NORTHWESTERN MADISON COUNTIES IN
SOUTHWESTERN ILLINOIS AND NORTHEASTERN SAINT CHARLES AND NORTH
CENTRAL SAINT LOUIS COUNTIES IN EAST CENTRAL MISSOURI...

At 348 PM CDT, a severe thunderstorm was located over Godfrey, moving
east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
  Florissant, Grafton, Elsah, Portage Des Sioux, Otterville, West
  Alton, McClusky, Old Kane, Kane, Godfrey, Jerseyville, Alton, East
  Alton, Wood River and Rosewood Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.

A Tornado Watch remains in effect until 900 PM CDT for portions of
southwest Illinois and east central Missouri.

&&

LAT...LON 3916 9050 3917 9050 3932 9027 3904 9015
      3901 9015 3900 9014 3900 9013 3885 9006
      3880 9036
TIME...MOT...LOC 2036Z 253DEG 34KT 3895 9039

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

839 
WWUS53 KLSX 272053
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
353 PM CDT Mon Apr 27 2026

ILC061-272103-
/O.CAN.KLSX.SV.W.0096.000000T0000Z-260427T2100Z/
Greene IL-
353 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHEASTERN GREENE
COUNTY...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for a portion of
southwest Illinois.

&&

LAT...LON 3893 9033 3901 9037 3913 9019 3904 9015
      3901 9015 3900 9014 3900 9013 3885 9006
      3881 9027
TIME...MOT...LOC 2048Z 253DEG 34KT 3899 9024

$$


ILC083-119-MOC183-189-272100-
/O.CON.KLSX.SV.W.0096.000000T0000Z-260427T2100Z/
Jersey IL-Madison IL-Saint Charles MO-Saint Louis MO-
353 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 4 PM CDT FOR
SOUTHEASTERN JERSEY AND NORTHWESTERN MADISON COUNTIES IN SOUTHWESTERN
ILLINOIS AND NORTHEASTERN SAINT CHARLES AND NORTHEASTERN SAINT LOUIS
COUNTIES IN EAST CENTRAL MISSOURI...

At 353 PM CDT, a severe thunderstorm was located near Godfrey, moving
east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
         roofs, siding, and trees.

Locations impacted include...
  West Alton, McClusky, Godfrey, Delhi, Alton, East Alton, Wood River
  and Rosewood Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.

Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.

A Tornado Watch remains in effect until 900 PM CDT for portions of
southwest Illinois and east central Missouri.

&&

LAT...LON 3893 9033 3901 9037 3913 9019 3904 9015
      3901 9015 3900 9014 3900 9013 3885 9006
      3881 9027
TIME...MOT...LOC 2048Z 253DEG 34KT 3899 9024

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
647 AM CDT Mon Apr 27 2026

.KEY MESSAGES...

- While periods of storms are expected through Monday morning, the most
  potent thunderstorms will occur this afternoon and evening.

- Thunderstorms this afternoon and evening will be capable of
  damaging wind gusts, large hail, and strong tornadoes.

- A period of cool, calm weather is expected mid-week through the
  weekend.

&&

.SHORT TERM... (Through Tuesday Night)
Issued at 155 AM CDT Mon Apr 27 2026

Storms across southeastern Missouri continue to butt up against an
instability gradient draped from north to south across Missouri.
The warm air advection feeding these storms will also push greater
instability slowly northeastward through this morning, though
propagation vectors will favor convection continuing to move east-
southeastward generally away from the CWA or into an unfavorable
environment. Additionally, the low-level jet refocusing across
Kansas will continue to support the downward trend in convection
across southeastern Missouri early this morning. Any linger storms
over the next couple of hours will be capable mainly of large hail,
though there is also a very low damaging wind and tornado threat for
storms that remain surface based.

Our attention turns to the storms over eastern Kansas that are
propagating eastward with the nose of the low-level jet. With the
nose of this low-level jet edging into northeastern Missouri later
this morning, the focus for these storms will spread into portions
of the CWA north of I-70. Vertical thermal profiles suggest that this
convection will be elevated, mitigating a threat of damaging wind
gusts and/or tornadoes. However, with around 40 kts of effective
shear and building MUCAPE, there is a low chance for isolated
instances of large hail.

How long this convection lingers is uncertain, although guidance
trends have been toward a lull in convective activity in the wake of
this convection and that associated with a cold front during the
late afternoon and evening. Ahead of the front, the warm sector
remains capped through much of the afternoon per a majority of
deterministic soundings. Although, any remnant outflow or
differential heating boundary from early day convection may serve as
enough of a forcing mechanism to spawn discrete convection during
the afternoon as lift from an approaching shortwave increases over
the region. If this convection does form, it will be in an
environment characterized by 2,000-2,500 J/kg of SBCAPE and roughly
50 kts of deep-layer shear. This will favor supercells capable of
all hazards, with long curved hodographs favoring strong tornadoes,
especially if storms are able to latch on to any remnant boundaries
across the CWA.

Where the environment isn't contaminated from earlier rounds of
convection, additional updrafts are expected along the cold front as
it enters the area 4-5pm. Forcing from the front paired with lift
from the shortwave will lead to numerous updrafts along the front.
While this will be occurring within a similar environment detailed
prior, the number of updrafts paired with them occurring along the
front may lead to destructive interactions and congealing into line
segments and/or clusters. While this will tend to limit a strong
tornado threat, storms will still be capable of all severe hazards.
Convection is expected to depart the CWA with the front by 9-10pm.

Even with the FROPA Monday evening, the threat for convection will
continue on Tuesday. Guidance consensus has the front stalling just
south of the CWA early Tuesday and then buckling northward as a
shortwave moves through the Central Plains and into the Midwest
through the day. This shortwave will send a subtle surface
reflection through the Mid South along the front, with a brief
period of warm air advection that will help force elevated
convection for areas mainly along and south of I-70. If the front
can move northward enough, shear profiles and instability amounts
favor supercells capable primarily of large hail across far
southeastern Missouri during the afternoon. Waning instability and
the front continuing southward will bring an end to rain chances
during the evening.

Elmore

&&

.LONG TERM... (Tuesday Night through Sunday)
Issued at 155 AM CDT Mon Apr 27 2026

Both deterministic guidance and ensemble clusters keep upper-level
troughing slowly moving eastward over the eastern CONUS through the
long range forecast period. This will maintain northwesterly flow
over the Middle Mississippi Valley through Saturday as several
rounds of high pressure pass through the region. As a result,
temperatures will run at or below climatological normals into the
weekend and mostly dry weather is expected.

Elmore

&&

.AVIATION...  (For the 12z TAFs through 12z Tuesday Morning)
Issued at 647 AM CDT Mon Apr 27 2026

Thunderstorms are expected at times throughout the day, impacting
all terminals. The greatest coverage of thunderstorms this morning
is expected to be across central, northeastern MO into west-central
IL impacting KCOU, KJEF, and KUIN, with lower confidence in
thunderstorms reaching the St. Louis metro terminals through early
afternoon. Another round of redevelopment will take place this
afternoon and evening with the greatest chance of severe
thunderstorms as well. These thunderstorms will be capable of hail,
strong winds, and some tornadoes. Trends will need to be monitored
for more significant terminal impacts beyond MVFR to IFR flight
conditions.

A cold front will pass through the region this evening, veering
southerly winds to northwesterly with drier conditions prevailing.
There is the potential for some post-frontal MVFR ceilings late
tonight into Tuesday morning, with the highest chance of impacts at
KUIN. However, given that confidence is low in impacts before the
end of the TAF period, VFR flight conditions are maintained for
now.

Pfahler

&&

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

WFO LSX

Hazardous Weather Outlook
National Weather Service St Louis MO
202 AM 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>075-084-085-099-280715-
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-
202 AM 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...Today and tonight.

Periods of thunderstorms are expected through the day into this
evening. Thunderstorms this afternoon and evening will be capable of
large hail, damaging wind gusts, and tornadoes.

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

There is a chance of thunderstorms Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report wind damage, hail occurrence and
size, and tornado occurrence to NWS St. Louis.

Elmore

Preliminary Local Storm Report
National Weather Service St Louis MO
226 PM CDT Mon Apr 27 2026

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

0619 AM     Hail             2 W Saint Louis         38.65N 90.28W
04/27/2026  E1.00 Inch       St. Louis City     MO   Public

            Report from mPING: Quarter (1.00 in.).

0621 AM     Hail             2 SE Hillsdale          38.66N 90.27W
04/27/2026  E1.00 Inch       St. Louis City     MO   Public

            Report from mPING: Quarter (1.00 in.).

0642 AM     Hail             2 SE Hillsdale          38.66N 90.27W
04/27/2026  E1.25 Inch       St. Louis City     MO   Public

            Report from mPING: Half Dollar (1.25 in.).

0313 AM     Hail             1 NW Bismarck           37.78N 90.63W
04/27/2026  E1.50 Inch       St. Francois       MO   Public

            Report from mPING: Ping Pong Ball (1.50
            in.).

0318 AM     Hail             1 NW Bismarck           37.78N 90.63W
04/27/2026  E1.75 Inch       St. Francois       MO   Public

            Report from mPING: Golf Ball (1.75 in.).

0320 AM     Hail             1 NW Bismarck           37.78N 90.63W
04/27/2026  E2.00 Inch       St. Francois       MO   Public

            Report from mPING: Hen Egg (2.00 in.).

0329 AM     Hail             1 SW Desloge            37.87N 90.53W
04/27/2026  E1.00 Inch       St. Francois       MO   Public

            Report from mPING: Quarter (1.00 in.).

0329 AM     Hail             1 N Leadington          37.84N 90.48W
04/27/2026  E1.00 Inch       St. Francois       MO   Public

            Report from mPING: Quarter (1.00 in.).

0337 AM     Hail             1 NW Farmington         37.79N 90.43W
04/27/2026  M1.25 Inch       St. Francois       MO   Public

0339 AM     Hail             1 S Farmington          37.76N 90.42W
04/27/2026  E1.75 Inch       St. Francois       MO   Public

            Report from mPING: Golf Ball (1.75 in.).

0358 AM     Hail             5 E Farmington          37.77N 90.34W
04/27/2026  E1.50 Inch       St. Francois       MO   Public

            Report from mPING: Ping Pong Ball (1.50
            in.).

0418 AM     Hail             4 SE Farmington         37.74N 90.36W
04/27/2026  E2.00 Inch       St. Francois       MO   Public

            Report from mPING: Hen Egg (2.00 in.).

1225 PM     Hail             2 S Harvester           38.72N 90.59W
04/27/2026  E1.00 Inch       St. Charles        MO   Public

            Report from mPING: Quarter (1.00 in.).

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
228 PM CDT Mon Apr 27 2026

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

0138 PM     Hail             1 E Clarkson Valley     38.63N 90.58W
04/27/2026  E1.25 Inch       St. Louis          MO   Public

0134 PM     Hail             1 SW Bridgeton          38.75N 90.44W
04/27/2026  E1.50 Inch       St. Louis          MO   Public

            Report from mPING: Ping Pong Ball (1.50
            in.).

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
237 PM CDT Mon Apr 27 2026

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

0221 PM     Hail             4 SE Jonesburg          38.82N 91.26W
04/27/2026  E1.00 Inch       Warren             MO   Public

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
245 PM CDT Mon Apr 27 2026

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

0152 PM     Tstm Wnd Dmg     2 SW Marine             38.77N 89.80W
04/27/2026                   Madison            IL   Public

            Shed damaged.

&&

Carney

Preliminary Local Storm Report
National Weather Service St Louis MO
311 PM CDT Mon Apr 27 2026

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

0300 PM     Tstm Wnd Dmg     5 W Winfield            38.99N 90.83W
04/27/2026                   Lincoln            MO   Emergency Mngr

            Power lines down on Ethlyn Rd.

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
312 PM CDT Mon Apr 27 2026

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

0305 PM     Hail             Old Monroe              38.93N 90.75W
04/27/2026  M0.70 Inch       Lincoln            MO   Public

&&