Tornado Warning 14, NWS St. Louis, MO

450 
WWUS53 KLSX 160252
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
952 PM CDT Wed Apr 15 2026

MOC189-510-160330-
/O.CON.KLSX.TO.W.0014.000000T0000Z-260416T0330Z/
Saint Louis MO-Saint Louis City MO-
952 PM CDT Wed Apr 15 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR
NORTHEASTERN SAINT LOUIS COUNTY AND THE SAINT LOUIS CITY...

At 952 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Ladue, moving east at 25 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows and vehicles will occur. Tree damage is
         likely.

Locations impacted include...
  Town and Country, Kirkwood, Crestwood, Creve Coeur, Webster Groves,
  Maryland Heights, Richmond Heights, Bridgeton, Overland, St. Ann,
  Clayton, University City, St. Louis, Berkeley, Jennings, Ferguson,
  Florissant and Bellefontaine Neighbors.

This includes the following State Parks...
Scott Joplin Historic Site.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.

&&

LAT...LON 3856 9042 3871 9049 3883 9022 3882 9018
      3883 9016 3883 9014 3881 9012 3880 9012
      3877 9017 3875 9018 3873 9021 3870 9021
      3867 9019 3864 9018 3861 9018 3859 9020
TIME...MOT...LOC 0240Z 248DEG 21KT 3861 9048

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Delia

763 
WWUS53 KLSX 160312
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1012 PM CDT Wed Apr 15 2026

MOC189-510-160330-
/O.CON.KLSX.TO.W.0014.000000T0000Z-260416T0330Z/
Saint Louis MO-Saint Louis City MO-
1012 PM CDT Wed Apr 15 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR
NORTHEASTERN SAINT LOUIS COUNTY AND THE SAINT LOUIS CITY...

At 1012 PM CDT, severe thunderstorms capable of producing a tornado
were located along a line from over Spanish Lake to over Mackenzie,
or along a line from over Spanish Lake to over Shrewsbury, moving
east at 35 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows and vehicles will occur. Tree damage is
         likely.

Locations impacted include...
  Overland, Berkeley, Ladue, Olivette, Ferguson, Florissant,
  University City, Richmond Heights, Webster Groves, Clayton,
  Brentwood, Jennings, Bellefontaine Neighbors, Maplewood, Black Jack
  and St. Louis.

This includes the following State Parks...
Scott Joplin Historic Site.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.

&&

LAT...LON 3857 9038 3876 9037 3883 9022 3882 9018
      3883 9016 3883 9014 3881 9012 3880 9012
      3877 9017 3875 9018 3873 9021 3870 9021
      3867 9019 3864 9018 3861 9018 3859 9020
TIME...MOT...LOC 0252Z 259DEG 31KT 3875 9039 3865 9046 3856 9049

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Delia

049 
WWUS53 KLSX 160319
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1019 PM CDT Wed Apr 15 2026

MOC189-160329-
/O.CAN.KLSX.TO.W.0014.000000T0000Z-260416T0330Z/
Saint Louis MO-
1019 PM CDT Wed Apr 15 2026

...TORNADO WARNING IS CANCELLED FOR NORTHEASTERN SAINT LOUIS
COUNTY...

The storms which prompted the warning have weakened below severe
limits, and no longer appear capable of producing a tornado.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1200 AM CDT for a portion of
east central Missouri.

&&

LAT...LON 3877 9017 3875 9018 3873 9021 3870 9021
      3867 9019 3864 9018 3863 9018 3860 9019
      3859 9020 3858 9031 3859 9032 3866 9030
      3872 9025 3874 9021 3877 9018
TIME...MOT...LOC 0312Z 259DEG 31KT 3878 9018 3868 9025 3859 9028

$$


MOC510-160330-
/O.CON.KLSX.TO.W.0014.000000T0000Z-260416T0330Z/
Saint Louis City MO-
1019 PM CDT Wed Apr 15 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR THE SAINT
LOUIS CITY...

At 1019 PM CDT, severe thunderstorms capable of producing a tornado
were located along a line from over Riverview to over Cahokia, moving
east at 35 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows and vehicles will occur. Tree damage is
         likely.

Locations impacted include...
  St. Louis, Wellston, Riverview and Glasgow Village.

This includes the following State Parks...
Scott Joplin Historic Site.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.

&&

LAT...LON 3877 9017 3875 9018 3873 9021 3870 9021
      3867 9019 3864 9018 3863 9018 3860 9019
      3859 9020 3858 9031 3859 9032 3866 9030
      3872 9025 3874 9021 3877 9018
TIME...MOT...LOC 0312Z 259DEG 31KT 3871 9026 3865 9028 3859 9028

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Delia

489 
WWUS53 KLSX 160323
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1023 PM CDT Wed Apr 15 2026

MOC510-160333-
/O.CAN.KLSX.TO.W.0014.000000T0000Z-260416T0330Z/
Saint Louis City MO-
1023 PM CDT Wed Apr 15 2026

...TORNADO WARNING IS CANCELLED FOR THE SAINT LOUIS CITY...

The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been cancelled.

&&

LAT...LON 3877 9017 3875 9018 3873 9021 3870 9021
      3867 9019 3864 9018 3863 9018 3860 9019
      3859 9020 3858 9031 3859 9032 3866 9030
      3872 9025 3874 9021 3877 9018
TIME...MOT...LOC 0319Z 260DEG 31KT 3872 9018 3866 9020 3860 9020

$$

Delia

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
703 PM CDT Wed Apr 15 2026

.KEY MESSAGES...

- Showers and thunderstorms are expected through tonight, with a threat
  of strong to severe thunderstorms capable mainly of damaging
  winds and large hail through 11pm.

- Showers and thunderstorms, some strong to severe, are expected
  again on Friday.

&&

.SHORT TERM... (Through Late Friday Night)
Issued at 159 PM CDT Wed Apr 15 2026

A series of shortwaves can be seen across the Great Plains in water
vapor imagery, with southwesterly flow across the Middle Mississippi
Valley ahead of these waves. An elongated fetch of warm, moist air
is feeding into the region from the Gulf, aiding in forcing
scattered showers and thunderstorms now across southeastern Missouri
and southwestern Illinois. Model and ACARS soundings out of KSTL
suggest that this convection is elevated above an inversion at 800-
850 mb. Associated convective debris has been inhibiting surface
heating so far, causing a dearth of instability along and south of
the MO I-44/IL I-55 corridor this afternoon. Westward across western
Missouri, insolation and mid-60s to low 70s dewpoints have yielded
upwards of 2000 J/kg of MLCAPE per recent SPC mesoanalysis. Here, an
extensive area of cumulus can be seen in visible satellite imagery.

Subtle leading waves within the southwesterly flow and an area of
lift via jet dynamics will produce nebulous lift across portions of
central and northeastern Missouri, as well as west-central Illinois
through this afternoon into this evening. If enough surface heating
is realized, then the cap will break, allowing for scattered showers
and thunderstorms among the aforementioned instability and about 50
kts of effective shear. This is an environment favorable for
organized updrafts, with some supercell structures possible. A
limiting factor for robust supercells is slight veer-back-veer
vertical wind profiles and/or weak low to mid-level flow noted in
ACARS soundings and the KLSX VWP. A mostly straight hodograph with
these attributes will lead to both left and right-moving updrafts
that will tend to be shorter-lived as they interact and grow into
localized clusters. If this round materializes, large hail and
damaging wind gusts will be the primary threats, though about 20 kts
of 0-1km shear and 200m2/s2 of low-level SRH means that there is a
low chance for brief tornadoes.

A solution that CAMs are increasingly supporting is that convection
this afternoon and early evening remains mostly subdued, allowing
for the atmosphere to remain undisturbed ahead of a cold front
moving into the region this evening and the early overnight hours.
Then, lift from the shortwave and upper-level jet will be greater,
pairing with the cold front to force numerous updrafts along and
immediately ahead of the front as it moves eastward. Initially, both
the vertical wind and thermal profile will be similar as this
afternoon, leading to discrete supercells. Confidence is high that
these discrete storms will form west of the CWA, growing upscale
into clusters and line segments as they interact with each other and
the front thanks to deep layer shear vectors parallel to the
boundary. These interactions and waning instability after sunset
will lead to a weakening trend as the line segments move into the
CWA. The primary threat with this round will be damaging wind gusts,
with line segments surging northeastward carrying a tornado threat
thanks to 30-40kts of 0-3km shear vectors oriented southwest to
northeast.

Once the convection and associated stratiform rain clears the CWA
during the early morning hours, mainly dry conditions are expected
through early Friday. Though, there is a low chance for convection
across southeastern Missouri and southwestern Illinois tomorrow
afternoon.

Our attention then turns to Friday as a highly-amplified trough
ejects out into the Plains and sends a cold front into the Midwest.
Ahead of this front, ensemble clusters have a median value of 2,000
J/kg of SBCAPE, with deterministic models showing as much as 3-4,000
J/kg. Deep layer shear is progged to be 45-50 kts, creating a
environment conducive for strong to severe thunderstorms across much
of the Midwest. Given the lead time and forecast load prior to then,
further details on thunderstorm threats, timing, and placement for
Friday will wait until later updates.

Elmore

&&

.LONG TERM... (Saturday through Next Wednesday)
Issued at 159 PM CDT Wed Apr 15 2026

At daybreak Saturday morning, guidance consensus is that Friday's
front will be deep into the Ohio Valley and clear of the CWA as the
axis of the upper-level trough pivots eastward toward the Middle
Mississippi Valley. With the core of this trough and the track of
the associated surface low being well north-northeast of the region,
the CWA will miss out on the core of the post-frontal airmass.
Still, increasingly deep northwesterly flow will push cooler air
into the CWA, pushing Saturday and Sunday's temperatures to at and
just below climatological normals.

The trough will quickly shift eastward early next week, allowing for
low to mid-level ridging to build and southwesterly flow to return
across the region. This favors warming temperatures, with ensembles
clustering around seasonal normals starting Monday and then above
normal by mid-week.

Elmore

&&

.AVIATION...  (For the 00z TAFs through 00z Thursday Evening)
Issued at 702 PM CDT Wed Apr 15 2026

A cold front is moving eastward, entering western MO, with a south-
southwest to north-northeast oriented broken line of strong to
severe storms along and ahead of the approaching boundary. These
storms are forecast to near the central Missouri terminals at the
start of the TAF, followed by KUIN and then the STL metro terminals
later this evening/early tonight. Any thunderstorms that directly
impacts terminals will be capable of IFR visibilities, gusty and
variable winds, along with heavy rain and frequent lightning.
Scattered showers may linger behind convection with conditions
expected to improve by late tonight for all terminals. Surface winds
veer southwesterly behind the front overnight becoming increasingly
southerly by Thursday afternoon.

Peine

&&

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

WFO LSX

Hazardous Weather Outlook
National Weather Service St Louis MO
205 PM CDT Wed Apr 15 2026

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-161915-
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-
205 PM CDT Wed Apr 15 2026

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

.DAY ONE...Tonight.

Thunderstorms are expected this evening and tonight. Storms this
evening will be capable of scattered instances of damaging winds and
large hail.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thunderstorms are forecast Friday and Friday night. Storms will be
capable of becoming strong to severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Elmore