Severe Thunderstorm Warning 83, NWS St. Louis, MO

259 
WWUS53 KLSX 271244
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
744 AM CDT Mon Apr 27 2026

MOC007-019-137-205-271330-
/O.CON.KLSX.SV.W.0083.000000T0000Z-260427T1330Z/
Audrain MO-Boone MO-Monroe MO-Shelby MO-
744 AM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 AM CDT FOR
WESTERN AUDRAIN AND NORTHERN BOONE COUNTIES IN CENTRAL MISSOURI AND
MONROE AND SOUTHERN SHELBY COUNTIES IN NORTHEASTERN MISSOURI...

At 744 AM CDT, severe thunderstorms were located along a line from
over Maud to near Rocheport, or along a line from 12 miles west of
Shelbina to 15 miles northwest of Columbia, moving east at 50 mph.

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

SOURCE...Automated weather station reported. At 740 am, a 62 mph wind
         gusts was measured at the Moberly automated weather station.

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

Locations impacted include...
  Harrisburg, Clarence, Madison, Woodlawn, Sturgeon, Maud, Holliday,
  Granville, Centralia, Shelbina, Paris, Hallsville, Stoutsville,
  Hunnewell, Emden, Thompson, Santa Fe, Mexico, Monroe City and
  Vandiver.

This includes the following State Parks...
Finger Lakes State Park, Union Covered Bridge Historic Site and Mark
Twain Lake Recreational Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. These storms have produced damaging winds and are capable of
producing 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.

&&

LAT...LON 3925 9231 3973 9230 3981 9184 3966 9185
      3966 9171 3960 9172 3960 9171 3956 9171
      3933 9172 3929 9172 3906 9191 3906 9253
      3925 9243
TIME...MOT...LOC 1235Z 269DEG 44KT 3963 9237 3929 9237 3904 9270

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

$$

Pfahler

858 
WWUS53 KLSX 271302
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
802 AM CDT Mon Apr 27 2026

MOC007-019-137-205-271330-
/O.CON.KLSX.SV.W.0083.000000T0000Z-260427T1330Z/
Audrain MO-Boone MO-Monroe MO-Shelby MO-
802 AM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 AM CDT FOR
CENTRAL AUDRAIN AND NORTHERN BOONE COUNTIES IN CENTRAL MISSOURI AND
MONROE AND SOUTHEASTERN SHELBY COUNTIES IN NORTHEASTERN MISSOURI...

At 802 AM CDT, severe thunderstorms were located along a line from 7
miles east of Shelbina to over Hallsville, or along a line from 7
miles east of Shelbina to 10 miles northeast of Columbia, moving east
at 55 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...
  Granville, Paris, Centralia, Shelbina, Hallsville, Stoutsville,
  Hunnewell, Santa Fe, Emden, Florida, Indian Creek, Thompson, Monroe
  City, Mexico and Vandiver.

This includes the following State Parks...
Finger Lakes State Park, Union Covered Bridge Historic Site and Mark
Twain Lake Recreational Area.

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.

&&

LAT...LON 3924 9224 3936 9210 3975 9215 3981 9184
      3973 9185 3966 9185 3966 9171 3963 9172
      3960 9172 3960 9171 3948 9171 3933 9172
      3929 9172 3906 9191 3906 9247
TIME...MOT...LOC 1244Z 263DEG 48KT 3964 9222 3930 9222 3905 9256

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

$$

Pfahler

401 
WWUS53 KLSX 271318
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
818 AM CDT Mon Apr 27 2026

MOC205-271328-
/O.CAN.KLSX.SV.W.0083.000000T0000Z-260427T1330Z/
Shelby MO-
818 AM CDT Mon Apr 27 2026

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

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

A Severe Thunderstorm Watch remains in effect until 1000 AM CDT for a
portion of northeast Missouri.

&&

LAT...LON 3924 9219 3936 9188 3966 9185 3966 9171
      3965 9172 3960 9172 3960 9171 3948 9171
      3942 9172 3929 9172 3906 9191 3906 9227
TIME...MOT...LOC 1302Z 263DEG 48KT 3967 9191 3933 9191 3908 9225

$$


MOC007-019-137-271330-
/O.CON.KLSX.SV.W.0083.000000T0000Z-260427T1330Z/
Audrain MO-Boone MO-Monroe MO-
818 AM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 AM CDT FOR
CENTRAL AUDRAIN AND NORTHEASTERN BOONE COUNTIES IN CENTRAL MISSOURI
AND EASTERN MONROE COUNTY IN NORTHEASTERN MISSOURI...

At 818 AM CDT, severe thunderstorms were located along a line from 5
miles northeast of Monroe City to 7 miles southwest of Mexico, moving
east at 55 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable
         tree damage. Wind damage is also likely to mobile homes,
         roofs, and outbuildings.

Locations impacted include...
  Centralia, Hallsville, Stoutsville, Santa Fe, Florida, Indian
  Creek, Thompson, Monroe City, Mexico and Vandiver.

This includes the following State Parks...
Mark Twain Lake Recreational Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. These storms are capable of producing
widespread 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.

&&

LAT...LON 3924 9219 3936 9188 3966 9185 3966 9171
      3965 9172 3960 9172 3960 9171 3948 9171
      3942 9172 3929 9172 3906 9191 3906 9227
TIME...MOT...LOC 1302Z 263DEG 48KT 3967 9191 3933 9191 3908 9225

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Pfahler

743 
WWUS53 KLSX 271325
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
825 AM CDT Mon Apr 27 2026

MOC007-019-137-271335-
/O.EXP.KLSX.SV.W.0083.000000T0000Z-260427T1330Z/
Audrain MO-Boone MO-Monroe MO-
825 AM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 830 AM CDT FOR CENTRAL
AUDRAIN AND NORTHEASTERN BOONE COUNTIES IN CENTRAL MISSOURI AND
EASTERN MONROE COUNTY IN NORTHEASTERN MISSOURI...

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

A Severe Thunderstorm Watch remains in effect until 1000 AM CDT for
portions of central and northeast Missouri.

&&

LAT...LON 3924 9219 3936 9188 3966 9185 3966 9171
      3965 9172 3960 9172 3960 9171 3948 9171
      3942 9172 3929 9172 3906 9191 3906 9227
TIME...MOT...LOC 1318Z 263DEG 48KT 3970 9164 3935 9164 3911 9198

$$

Pfahler

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
442 AM CDT Mon Apr 27 2026

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

0333 AM     Hail             1 SW Farmington         37.77N 90.44W
04/27/2026  E2.00 Inch       St. Francois       MO   Public

            Time estimated from radar.

&&

Delia

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

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

0333 AM     Hail             Farmington              37.78N 90.43W
04/27/2026  E2.00 Inch       St. Francois       MO   Emergency Mngr

            Time estimated from radar.

&&

Delia

Preliminary Local Storm Report
National Weather Service St Louis MO
506 AM CDT Mon Apr 27 2026

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

0333 AM     Hail             Farmington              37.78N 90.42W
04/27/2026  M2.00 Inch       St. Francois       MO   Emergency Mngr

            Photo of multiple large hail stones, largest
            is measured at 2 inches. Time estimated from
            radar.

&&

Delia

Preliminary Local Storm Report
National Weather Service St Louis MO
548 AM CDT Mon Apr 27 2026

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

0541 AM     Hail             2 S Belleville          38.50N 90.00W
04/27/2026  E1.00 Inch       St. Clair          IL   Amateur Radio

            Pea to quarter sized hail. Time estimate
            from radar.

&&

Delia

Preliminary Local Storm Report
National Weather Service St Louis MO
629 AM CDT Mon Apr 27 2026

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

0616 AM     Hail             University City         38.67N 90.33W
04/27/2026  E1.50 Inch       St. Louis          MO   Public

            Estimated ping pong sized hail with photo
            and US quarter. Time estimated from radar.

&&

Delia

Preliminary Local Storm Report
National Weather Service St Louis MO
631 AM CDT Mon Apr 27 2026

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

0620 AM     Hail             2 ENE Maplewood         38.63N 90.30W
04/27/2026  E1.00 Inch       St. Louis City     MO   County Official

&&

Delia