Severe Thunderstorm Warning 112, NWS St. Louis, MO

680 
WWUS53 KLSX 272333
SVSLSX

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

MOC073-272343-
/O.CAN.KLSX.SV.W.0112.000000T0000Z-260427T2345Z/
Gasconade MO-
633 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR GASCONADE COUNTY...

The storms which prompted the warning have 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
east central Missouri.

&&

LAT...LON 3870 9137 3873 9096 3855 9096 3854 9095
      3853 9093 3853 9092 3854 9091 3854 9090
      3856 9087 3854 9086 3830 9093 3830 9137
TIME...MOT...LOC 2255Z 259DEG 55KT 3858 9178 3845 9171 3838 9175

$$


MOC071-219-272345-
/O.CON.KLSX.SV.W.0112.000000T0000Z-260427T2345Z/
Franklin MO-Warren MO-
633 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
FRANKLIN AND SOUTHERN WARREN COUNTIES...

At 633 PM CDT, severe thunderstorms were located along a line from
near Marthasville to over Union, or along a line from 9 miles north
of Washington to over Union, moving east at 65 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail
         damage to roofs, siding, windows, and vehicles. Expect wind
         damage to roofs, siding, and trees.

This severe thunderstorm will be near...
  Washington, Dutzow, Union, Marthasville and St. Clair around 635 PM
  CDT.
  Villa Ridge around 640 PM CDT.

This includes Interstate 44 in Missouri between exits 239 and 247.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. These storms are 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 a portion of
east central Missouri.

&&

LAT...LON 3870 9137 3873 9096 3855 9096 3854 9095
      3853 9093 3853 9092 3854 9091 3854 9090
      3856 9087 3854 9086 3830 9093 3830 9137
TIME...MOT...LOC 2255Z 259DEG 55KT 3858 9178 3845 9171 3838 9175

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Jaja

033 
WWUS53 KLSX 272353 RRA
SVSLSX

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

MOC071-219-280003-
/O.EXP.KLSX.SV.W.0112.000000T0000Z-260427T2345Z/
Franklin MO-Warren MO-
653 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING HAS EXPIRED FOR FRANKLIN AND SOUTHERN
WARREN COUNTIES...

The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.

A Tornado Watch remains in effect until 900 PM CDT for a portion of
east central Missouri.

&&

LAT...LON 3870 9137 3873 9096 3855 9096 3854 9095
      3853 9093 3853 9092 3854 9091 3854 9090
      3856 9087 3854 9086 3830 9093 3830 9137
TIME...MOT...LOC 2333Z 260DEG 55KT 3868 9105 3855 9098 3848 9102

$$

Jaja

Area Forecast Discussion
National Weather Service St Louis MO
504 PM 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 456 PM CDT Mon Apr 27 2026

(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 /WEDNESDAY THROUGH MONDAY/...
Issued at 456 PM CDT Mon Apr 27 2026

(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 /18Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 456 PM CDT Mon Apr 27 2026

Taking a look across the area, scattered thunderstorms continue
to progress eastwards across central MO this afternoon with an
advancing cold front mainly affecting KUIN, KJEF, and KCOU for
the moment. Expect these developing thunderstorms to move into
the St Louis metro between 5-7 PM this evening promoting mainly
MVFR to IFR cigs and IFR to LIFR vsbys periodically. Otherwise,
southerly to southeasterly winds will become more northwesterly
behind the passing frontal boundary to end the TAF period.

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Flood Watch until 9 PM CDT this evening for MOZ036-041-042-
     047>052-059>065.
IL...Flood Watch until 9 PM CDT this evening for ILZ058>060-064-065-
     069-070-074-098>102.

&&

SHORT TERM...
LONG TERM...
AVIATION...WFO FSD

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
443 PM CDT Mon Apr 27 2026

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

0440 PM     Hail             3 NW Rush Hill          39.24N 91.78W
04/27/2026  E1.00 Inch       Audrain            MO   Public

            third round of quarter-sized hail.

&&

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

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

0446 PM     Hail             California              38.63N 92.57W
04/27/2026  E0.70 Inch       Moniteau           MO   Public

&&

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

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

0410 PM     Hail             1 NW Mexico             39.18N 91.88W
04/27/2026  E1.75 Inch       Audrain            MO   Emergency Mngr

            picture received of hail with a quarter for
            reference. Time estimated.

&&

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

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

0530 PM     Hail             1 N Winfield            39.01N 90.74W
04/27/2026  E1.00 Inch       Lincoln            MO   Public

&&

MCF

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

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

0535 PM     Hail             Silex                   39.12N 91.06W
04/27/2026  E1.50 Inch       Lincoln            MO   Dept of Highways

            time estimated.

&&

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

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

0342 PM     Hail             Mexico                  39.17N 91.87W
04/27/2026  E2.00 Inch       Audrain            MO   Emergency Mngr

&&

Carney