Alert archive / Missouri / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 119, NWS St. Louis, MO

April 27, 20264 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 27, 2026, 6:40 PM CDT for 4 counties in Missouri. It was in force for 48 min. 23 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 27, 2026, 6:40 PM CDT (23:40 UTC)
Expired
Apr 27, 2026, 7:28 PM CDT
In force
48 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
1.25 in
Wind
60.0 mph

Counties Franklin County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 20 km from the middle of the area, began a volume at 23:41 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Apr 27, 6:44 PM CDTHAIL 11 Sw Pacific, MOReport from mPING: Quarter (1.00 in.).
Apr 27, 6:45 PM CDTTSTM WND DMG2 Nnw Pacific, MO3 trees down at highway 100 and Thornton Rd.
Apr 27, 6:45 PM CDTTSTM WND DMG2 Nnw Pacific, MOlarge tree down on Thornton Rd.
Apr 27, 6:45 PM CDTTSTM WND DMG4 Wsw Wildwood, MOlarge tree down on Bassett Rd.
Apr 27, 6:46 PM CDTHAIL 1.751 Ene Gray Summit, MO
Apr 27, 6:48 PM CDTTSTM WND GST 60Gray Summit, MOEstimated wind coupled with golf ball-sized hail.
Apr 27, 6:48 PM CDTHAIL 1.252 E Gray Summit, MOReport from mPING: Half Dollar (1.25 in.).
Apr 27, 6:54 PM CDTHAIL 24 N Pacific, MOReport from mPING: Hen Egg (2.00 in.).
Apr 27, 6:55 PM CDTTSTM WND DMGEllisville, MOLarge tree limb down.
Apr 27, 6:58 PM CDTHAIL 12 Sw Clarkson Valley, MOReport from mPING: Quarter (1.00 in.).
Apr 27, 7:05 PM CDTTSTM WND DMG2 E Clarkson Valley, MO8 in diameter tree limb down onto house.
Apr 27, 7:05 PM CDTTSTM WND DMG2 Nnw Peerless Park, MOSeveral small tree limbs down.
Apr 27, 7:07 PM CDTTSTM WND DMG1 Wsw Saint Ann, MO6 in diameter tree limbs down and small tree snapped.
Apr 27, 7:08 PM CDTTSTM WND DMG1 Ene Olivette, MOLarge tree limb down.
Apr 27, 7:10 PM CDTTSTM WND DMG1 Wnw Saint John, MOSome shingles removed from roofs of homes.
Apr 27, 7:10 PM CDTTSTM WND DMGFlorissant, MO4 buildings collapsed in Florissant.
Apr 27, 7:10 PM CDTHAIL 1House Springs, MO
Apr 27, 7:11 PM CDTTSTM WND DMGSaint Ann, MO8-inch diameter trees downed onto cars.
Apr 27, 7:11 PM CDTTSTM WND GST 60Saint Ann, MOpower outage as the wind gust moved in.
Apr 27, 7:12 PM CDTTSTM WND DMG1 W Spanish Lake, MOMultiple large tree limbs down.
Apr 27, 7:13 PM CDTTSTM WND DMG1 Sw Spanish Lake, MODelayed report. Video on Facebook shows several large trees snapped and uprooted along Bayonne Dr.
Apr 27, 7:20 PM CDTTSTM WND DMG1 E Richmond Heights, MOpower line down on McCausland.
Apr 27, 7:25 PM CDTTSTM WND DMG1 E Richmond Heights, MOCorrects previous tstm wnd dmg report from 1 E Richmond Heights. power line down on McCausland.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 23 storm reports to this severe thunderstorm warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 27, 12:50 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.7 hours before the alert went out and 232 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2026-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2026-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1053 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
306 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

076 
WUUS53 KLSX 272340
SVRLSX
MOC071-099-183-189-280045-
/O.NEW.KLSX.SV.W.0119.260427T2340Z-260428T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
640 PM CDT Mon Apr 27 2026

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Franklin County in east central Missouri...
  Northwestern Jefferson County in east central Missouri...
  Central Saint Charles County in east central Missouri...
  Saint Louis County in east central Missouri...

* Until 745 PM CDT.

* At 640 PM CDT, a severe thunderstorm was located near Villa Ridge,
  moving northeast at 55 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Pacific, Gray Summit and Villa Ridge around 645 PM CDT.
  Wildwood and Eureka around 650 PM CDT.
  Byrnes Mill and High Ridge around 655 PM CDT.

Other locations impacted by the severe thunderstorm include
Catawissa, Robertsville, Parkdale and Peerless Park.

This includes the following State Parks...
Babler Memorial State Park, Route 66 State Park, Castlewood State
Park and Robertsville State Park.

This includes the following highways...
Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri
between exits 251 and 277. Interstate 55 in Missouri near exit 191.

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 a portion of
east central Missouri.

&&

LAT...LON 3855 9096 3866 9096 3875 9051 3886 9039
      3890 9032 3882 9020 3883 9013 3880 9012
      3877 9018 3874 9021 3872 9025 3866 9030
      3859 9032 3853 9026 3844 9029 3840 9033
      3845 9035 3829 9093 3856 9086 3853 9093
TIME...MOT...LOC 2340Z 230DEG 48KT 3842 9084

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Jaja
6 follow-up statements
365 
WWUS53 KLSX 272346
SVSLSX

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

MOC071-099-183-189-280045-
/O.CON.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Franklin MO-Jefferson MO-Saint Charles MO-Saint Louis MO-
646 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN FRANKLIN, NORTHWESTERN JEFFERSON, CENTRAL SAINT CHARLES
AND SAINT LOUIS COUNTIES...

At 646 PM CDT, a severe thunderstorm was located over Pacific, moving
northeast at 55 mph.

HAZARD...Golf 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...
  Wildwood, Eureka, Pacific, Gray Summit and Villa Ridge around 650
  PM CDT.
  Byrnes Mill and High Ridge around 655 PM CDT.
  Ellisville, Ballwin, Clarkson Valley, Winchester, Valley Park, Twin
  Oaks, Spirit of St. Louis Airport, Murphy and Weldon Spring around
  700 PM CDT.

Other locations impacted by the severe thunderstorm include
Catawissa, Parkdale and Peerless Park.

This includes the following State Parks...
Babler Memorial State Park, Route 66 State Park, Castlewood State
Park and Robertsville State Park.

This includes the following highways...
Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri
between exits 251 and 277. Interstate 55 in Missouri near exit 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
dangerous hail and damaging winds.

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 3855 9096 3866 9096 3875 9051 3886 9039
      3890 9032 3882 9020 3883 9013 3880 9012
      3877 9018 3874 9021 3872 9025 3866 9030
      3859 9032 3853 9026 3844 9029 3840 9033
      3845 9035 3829 9093 3856 9086 3853 9093
TIME...MOT...LOC 2340Z 230DEG 48KT 3842 9084

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Jaja
527 
WWUS53 KLSX 272346 RRA
SVSLSX

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

MOC071-099-183-189-280045-
/O.CON.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Franklin MO-Jefferson MO-Saint Charles MO-Saint Louis MO-
646 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN FRANKLIN, NORTHWESTERN JEFFERSON, CENTRAL SAINT CHARLES
AND SAINT LOUIS COUNTIES...

At 646 PM CDT, a severe thunderstorm was located over Pacific, moving
northeast at 55 mph.

HAZARD...Golf 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...
  Wildwood, Eureka, Pacific, Gray Summit and Villa Ridge around 650
  PM CDT.
  Byrnes Mill and High Ridge around 655 PM CDT.
  Ellisville, Ballwin, Clarkson Valley, Winchester, Valley Park, Twin
  Oaks, Spirit of St. Louis Airport, Murphy and Weldon Spring around
  700 PM CDT.

Other locations impacted by the severe thunderstorm include
Catawissa, Parkdale and Peerless Park.

This includes the following State Parks...
Babler Memorial State Park, Route 66 State Park, Castlewood State
Park and Robertsville State Park.

This includes the following highways...
Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri
between exits 251 and 277. Interstate 55 in Missouri near exit 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
dangerous hail and damaging winds.

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 3855 9096 3866 9096 3875 9051 3886 9039
      3890 9032 3882 9020 3883 9013 3880 9012
      3877 9018 3874 9021 3872 9025 3866 9030
      3859 9032 3853 9026 3844 9029 3840 9033
      3845 9035 3829 9093 3856 9086 3853 9093
TIME...MOT...LOC 2340Z 230DEG 48KT 3842 9084

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Jaja
257 
WWUS53 KLSX 272352
SVSLSX

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

MOC071-099-183-189-280045-
/O.CON.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Franklin MO-Jefferson MO-Saint Charles MO-Saint Louis MO-
652 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN FRANKLIN, NORTHWESTERN JEFFERSON, CENTRAL SAINT CHARLES
AND SAINT LOUIS COUNTIES...

At 652 PM CDT, a severe thunderstorm was located over Wildwood,
moving northeast at 60 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail
         damage to roofs, siding, windows, and vehicles. Expect
         considerable tree damage. Wind damage is also likely to
         mobile homes, roofs, and outbuildings.

This severe thunderstorm will be near...
  Wildwood, Ellisville, Eureka, Pacific, Defiance and Gray Summit
  around 655 PM CDT.
  Clarkson Valley, Chesterfield, Ballwin, Spirit of St. Louis
  Airport, Weldon Spring, Manchester, Winchester, Weldon Spring
  Heights, O'Fallon and Twin Oaks around 700 PM CDT.
  Town and Country, Creve Coeur, St. Peters, Westwood, Country Life
  Acres, Frontenac, Des Peres and Crystal Lake Park around 705 PM
  CDT.

Other locations impacted by the severe thunderstorm include Matson.

This includes the following State Parks...
Babler Memorial State Park, Route 66 State Park, Castlewood State
Park and Robertsville State Park.

This includes the following highways...
Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri
between exits 251 and 277. Interstate 55 in Missouri near exit 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
widespread damaging winds and dangerous 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 3855 9096 3866 9096 3875 9051 3886 9039
      3890 9032 3882 9020 3883 9013 3880 9012
      3877 9018 3874 9021 3872 9025 3866 9030
      3859 9032 3853 9026 3844 9029 3840 9033
      3845 9035 3829 9093 3856 9086 3853 9093
TIME...MOT...LOC 2346Z 221DEG 51KT 3850 9077

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Jaja
759 
WWUS53 KLSX 280001
SVSLSX

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

MOC071-280011-
/O.CAN.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Franklin MO-
701 PM CDT Mon Apr 27 2026

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

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

&&

LAT...LON 3870 9075 3875 9051 3886 9039 3890 9032
      3882 9020 3883 9013 3880 9012 3877 9018
      3874 9021 3872 9025 3866 9030 3859 9032
      3853 9026 3844 9029 3840 9033 3845 9035
      3834 9075 3842 9074 3864 9073 3864 9074
TIME...MOT...LOC 2352Z 221DEG 51KT 3856 9069

$$


MOC099-183-189-280045-
/O.CON.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Jefferson MO-Saint Charles MO-Saint Louis MO-
701 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHWESTERN JEFFERSON, CENTRAL SAINT CHARLES AND SAINT LOUIS
COUNTIES...

At 701 PM CDT, a severe thunderstorm was located over Chesterfield,
moving northeast at 60 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail
         damage to roofs, siding, windows, and vehicles. Expect
         considerable tree damage. Wind damage is also likely to
         mobile homes, roofs, and outbuildings.

This severe thunderstorm will be near...
  Chesterfield, Town and Country, Creve Coeur, St. Peters, Weldon
  Spring, Clarkson Valley, Ballwin, Wildwood, Spirit of St. Louis
  Airport and Ellisville around 705 PM CDT.
  Maryland Heights, Champ, St. Charles, St. Ann, Overland, Olivette,
  Ladue and Sycamore Hills around 710 PM CDT.
  Hazelwood, Bridgeton, Lambert-St. Louis International Airport,
  Berkeley, Edmundson, Woodson Terrace, Breckenridge Hills, Calverton
  Park, Ferguson and St. John around 715 PM CDT.

This includes the following State Parks...
Babler Memorial State Park, Route 66 State Park and Castlewood State
Park.

This includes the following highways...
Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri
between exits 261 and 277. Interstate 55 in Missouri near exit 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
widespread damaging winds and dangerous 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 3870 9075 3875 9051 3886 9039 3890 9032
      3882 9020 3883 9013 3880 9012 3877 9018
      3874 9021 3872 9025 3866 9030 3859 9032
      3853 9026 3844 9029 3840 9033 3845 9035
      3834 9075 3842 9074 3864 9073 3864 9074
TIME...MOT...LOC 2352Z 221DEG 51KT 3856 9069

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Jaja
599 
WWUS53 KLSX 280014 RRA
SVSLSX

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

MOC099-183-189-280045-
/O.CON.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Jefferson MO-Saint Charles MO-Saint Louis MO-
714 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHWESTERN JEFFERSON, NORTHEASTERN SAINT CHARLES AND SAINT LOUIS
COUNTIES...

At 714 PM CDT, a severe thunderstorm was located over Bridgeton, or
over Hazelwood, moving northeast at 60 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail
         damage to roofs, siding, windows, and vehicles. Expect
         considerable tree damage. Wind damage is also likely to
         mobile homes, roofs, and outbuildings.

This severe thunderstorm will be near...
  Hazelwood, Bridgeton, St. Charles, Lambert-St. Louis International
  Airport, Maryland Heights, Champ, Berkeley, St. Ann, Edmundson and
  Woodson Terrace around 715 PM CDT.
  Florissant and Black Jack around 720 PM CDT.
  West Alton and Spanish Lake around 725 PM CDT.

This includes the following State Parks...
Route 66 State Park and Castlewood State Park.

This includes the following highways...
Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri
between exits 264 and 277. Interstate 55 in Missouri near exit 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
widespread damaging winds and dangerous 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 3858 9061 3875 9051 3886 9039 3890 9032
      3882 9020 3883 9013 3880 9012 3877 9018
      3874 9021 3872 9025 3866 9030 3859 9032
      3853 9026 3844 9029 3840 9033 3845 9035
      3834 9075 3842 9074
TIME...MOT...LOC 0001Z 221DEG 51KT 3866 9058

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Jaja
987 
WWUS53 KLSX 280028 RRA
SVSLSX

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

MOC099-183-189-280038-
/O.CAN.KLSX.SV.W.0119.000000T0000Z-260428T0045Z/
Jefferson MO-Saint Charles MO-Saint Louis MO-
728 PM CDT Mon Apr 27 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR NORTHWESTERN
JEFFERSON, NORTHEASTERN SAINT CHARLES AND SAINT LOUIS COUNTIES...

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
east central Missouri.

&&

LAT...LON 3858 9061 3875 9051 3886 9039 3890 9032
      3882 9020 3883 9013 3880 9012 3877 9018
      3874 9021 3872 9025 3866 9030 3859 9032
      3853 9026 3844 9029 3840 9033 3845 9035
      3834 9075 3842 9074
TIME...MOT...LOC 0014Z 221DEG 51KT 3880 9043

$$

Jaja

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 27, 5:04 PM CDT, 1 hour 36 minutes earlier. Its 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.
Area forecast discussion, Apr 27, 5:04 PM CDT, 1 hour 36 minutes before
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, Apr 27, 2:02 AM CDT, 16 hours 38 minutes before
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

In the hours before

Local storm report, Apr 27, 6:34 PM CDT, 6 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
634 PM CDT Mon Apr 27 2026

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

0625 PM     Hail             3 NNW Leslie            38.45N 91.25W
04/27/2026  E1.75 Inch       Franklin           MO   Amateur Radio

&&

Britt
Local storm report, Apr 27, 6:35 PM CDT, 5 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
635 PM CDT Mon Apr 27 2026

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

0615 PM     Tstm Wnd Dmg     Gerald                  38.40N 91.32W
04/27/2026                   Franklin           MO   Public

            tree down at Champion City rd and Red Oak
            rd. Time estimated.

&&
Local storm report, Apr 27, 6:37 PM CDT, 3 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
637 PM CDT Mon Apr 27 2026

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

0635 PM     Hail             1 NNE O'Fallon          38.80N 90.70W
04/27/2026  M1.25 Inch       St. Charles        MO   Amateur Radio

&&
Local storm report, Apr 27, 6:38 PM CDT, 2 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
638 PM CDT Mon Apr 27 2026

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

0635 PM     Hail             2 WNW O'Fallon          38.79N 90.74W
04/27/2026  E1.00 Inch       St. Charles        MO   NWS Employee

&&
Local storm report, Apr 27, 6:39 PM CDT, 1 minute before
Preliminary Local Storm Report
National Weather Service St Louis MO
639 PM CDT Mon Apr 27 2026

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

0639 PM     Hail             2 NNE O'Fallon          38.81N 90.70W
04/27/2026  E1.25 Inch       St. Charles        MO   Amateur Radio

&&
Local storm report, Apr 27, 6:40 PM CDT, 0 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
640 PM CDT Mon Apr 27 2026

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

0637 PM     Hail             4 NW Saint Peters       38.83N 90.64W
04/27/2026  E1.00 Inch       St. Charles        MO   Public

0636 PM     Hail             3 NE O'Fallon           38.81N 90.67W
04/27/2026  E1.25 Inch       St. Charles        MO   Public

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

0624 PM     Hail             Bourbon                 38.15N 91.25W
04/27/2026  E1.00 Inch       Crawford           MO   Public

            Report from mPING: Quarter (1.00 in.).

&&

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 8:43 PM CDTTornado WarningLSXBoone, Callaway, Cole, Moniteau30 min
Apr 26, 10:08 PM CDTTornado WarningLSXOsage13 min
Apr 27, 1:06 AM CDTSevere Thunderstorm WarningLSXCrawford39 min
Apr 27, 2:10 AM CDTAreal Flood AdvisoryLSXCrawford3 hr
Apr 27, 2:44 AM CDTSevere Thunderstorm WarningLSXWashington31 min
Apr 27, 3:08 AM CDTSevere Thunderstorm Warning Considerable damage threatLSXSainte Genevieve, Saint Francois, Washington52 min
Apr 27, 3:36 AM CDTSevere Thunderstorm WarningLSXSainte Genevieve, Saint Francois39 min
Apr 27, 3:41 AM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Warren49 min
Apr 27, 4:02 AM CDTSevere Thunderstorm WarningLSXSainte Genevieve24 min
Apr 27, 6:52 AM CDTSevere Thunderstorm Warning Considerable damage threatLSXKnox, Shelby38 min
Apr 27, 7:35 AM CDTSevere Thunderstorm WarningLSXAudrain, Boone, Monroe, Shelby55 min
Apr 27, 7:54 AM CDTTornado WarningLSXMonroe, Ralls51 min
Apr 27, 8:10 AM CDTSevere Thunderstorm Warning Considerable damage threatLSXAudrain, Lincoln, Marion, Pike, Ralls65 min
Apr 27, 8:24 AM CDTTornado WarningLSXPike, Ralls51 min
Apr 27, 10:09 AM CDTRiver Flood WarningLSXOsage24 hr
Apr 27, 10:41 AM CDTFlash Flood WarningLSXBoone, Cole, Moniteau3 hr
Apr 27, 11:18 AM CDTFlood WatchLSXAudrain, Boone, Callaway, Cole, Franklin, Gasconade and 10 more10 hr
Apr 27, 11:48 AM CDTFlash Flood WarningLSXAudrain, Boone, Callaway, Cole, Moniteau, Montgomery and 1 more3 hr
Apr 27, 12:09 PM CDTAreal Flood AdvisoryLSXLincoln, Pike, Warren3 hr
Apr 27, 12:27 PM CDTTornado WarningLSXSaint Charles, Saint Louis, City of Saint Louis48 min
Apr 27, 1:25 PM CDTSevere Thunderstorm WarningLSXFranklin, Saint Charles, Saint Louis37 min
Apr 27, 1:51 PM CDTAreal Flood AdvisoryLSXMontgomery, Warren3 hr
Apr 27, 1:55 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis45 min
Apr 27, 2:01 PM CDTTornado WarningLSXCity of Saint Louis27 min
Apr 27, 2:05 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Pike, Warren40 min
Apr 27, 2:13 PM CDTAreal Flood AdvisoryLSXSaint Louis, City of Saint Louis3 hr
Apr 27, 2:39 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Warren51 min
Apr 27, 2:42 PM CDTRiver Flood WarningLSXMonroe20 hr
Apr 27, 2:49 PM CDTTornado WarningLSXSaint Charles, Warren41 min
Apr 27, 2:54 PM CDTRiver Flood WarningLSXJefferson, Saint Louis6 days
Apr 27, 2:57 PM CDTSevere Thunderstorm WarningLSXBoone, Moniteau48 min
Apr 27, 3:05 PM CDTRiver Flood WarningLSXPerry, Sainte Genevieve8 days
Apr 27, 3:14 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis46 min
Apr 27, 3:19 PM CDTTornado WarningLSXSaint Charles, Saint Louis41 min
Apr 27, 3:25 PM CDTSevere Thunderstorm WarningLSXAudrain, Callaway42 min
Apr 27, 3:37 PM CDTFlash Flood WarningLSXBoone5 hr
Apr 27, 3:39 PM CDTRiver Flood WarningLSXLewis11 hr
Apr 27, 3:41 PM CDTRiver Flood WarningLSXLincoln24 hr
Apr 27, 3:41 PM CDTTornado WarningLSXAudrain, Callaway49 min
Apr 27, 3:43 PM CDTSevere Thunderstorm WarningLSXBoone62 min
Apr 27, 3:46 PM CDTSevere Thunderstorm WarningLSXMarion, Pike, Ralls44 min
Apr 27, 3:46 PM CDTTornado WarningLSXBoone14 min
Apr 27, 3:53 PM CDTRiver Flood WarningLSXLincoln4 days
Apr 27, 3:59 PM CDTRiver Flood WarningLSXCrawford, Washington18 hr
Apr 27, 4:00 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Moniteau60 min
Apr 27, 4:07 PM CDTSevere Thunderstorm WarningLSXAudrain, Pike, Ralls53 min
Apr 27, 4:09 PM CDTTornado WarningLSXAudrain, Montgomery, Pike, Ralls51 min
Apr 27, 4:13 PM CDTFlash Flood WarningLSXAudrain5 hr
Apr 27, 4:29 PM CDTTornado WarningLSXBoone, Callaway, Cole, Moniteau46 min
Apr 27, 4:34 PM CDTTornado WarningLSXMarion29 min
Apr 27, 4:35 PM CDTFlash Flood WarningLSXMonroe5 hr
Apr 27, 4:46 PM CDTTornado WarningLSXPike44 min
Apr 27, 4:52 PM CDTFlash Flood WarningLSXMarion, Ralls4 hr
Apr 27, 4:54 PM CDTTornado WarningLSXAudrain, Pike21 min
Apr 27, 4:57 PM CDTRiver Flood WarningLSXCallaway, Osage4 days
Apr 27, 4:57 PM CDTRiver Flood WarningLSXGasconade, Montgomery3 days
Apr 27, 4:57 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Pike63 min
Apr 27, 5:00 PM CDTTornado WarningLSXPike30 min
Apr 27, 5:04 PM CDTRiver Flood WarningLSXMarion22 hr
Apr 27, 5:09 PM CDTSevere Thunderstorm WarningLSXCallaway19 min
Apr 27, 5:14 PM CDTSevere Thunderstorm WarningLSXCallaway, Cole, Osage61 min
Apr 27, 5:20 PM CDTFlash Flood WarningLSXPike, Ralls3 hr
Apr 27, 5:21 PM CDTSevere Thunderstorm WarningLSXPike39 min
Apr 27, 5:32 PM CDTSevere Thunderstorm WarningLSXLincoln43 min
Apr 27, 5:47 PM CDTSevere Thunderstorm WarningLSXLincoln58 min
Apr 27, 5:55 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Warren50 min
Apr 27, 5:57 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Washington48 min
Apr 27, 5:59 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles46 min
Apr 27, 6:09 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren36 min
Apr 27, 6:26 PM CDTSevere Thunderstorm Warning Considerable damage threatLSXFranklin, Jefferson64 min
Apr 27, 6:28 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis47 min
Apr 27, 6:31 PM CDTTornado WarningLSXFranklin, Jefferson, Washington59 min
Apr 27, 6:41 PM CDTTornado WarningLSXSaint Charles, Saint Louis32 min
Apr 27, 6:45 PM CDTSevere Thunderstorm WarningLSXCrawford45 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2026Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.