Alert archive / Illinois / Tornado Warnings in 2026

Tornado Warning 43, NWS St. Louis, MO

April 27, 2026Marion County, Missouri; Adams County, Brown County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 27, 2026, 4:34 PM CDT for Marion County, Missouri; Adams County, Brown County, Illinois. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 27, 2026, 4:34 PM CDT (21:34 UTC)
Expired
Apr 27, 2026, 5:03 PM CDT
In force
29 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Adams County, IL, Brown County, IL, Marion County, MO

The radar

The St Louis radar (KLSX), 142 km from the middle of the area, began a volume at 21:39 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 212 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°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.

244 
WFUS53 KLSX 272134
TORLSX
ILC001-009-MOC127-272230-
/O.NEW.KLSX.TO.W.0043.260427T2134Z-260427T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
434 PM CDT Mon Apr 27 2026

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Adams County in west central Illinois...
  Northwestern Brown County in west central Illinois...
  Eastern Marion County in northeastern Missouri...

* Until 530 PM CDT.

* At 434 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Palmyra, moving northeast at 30 mph. Another storm
  capable of a tornado is located east of Quincy in Adams County.

  HAZARD...Tornado and quarter size hail.

  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.

* This tornado will be near...
  Hannibal and Palmyra around 435 PM CDT.
  Fall Creek around 450 PM CDT.

Other locations impacted by the tornado include Marblehead, Burton,
Adams, Fowler, Liberty, Columbus, Coatsburg and Paloma.

This includes Interstate 172 between exits 2 and 19.

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 3969 9150 3977 9158 4020 9117 4019 9091
      4010 9091 4010 9070 4009 9071 4008 9071
      4008 9067 4005 9068 4004 9065 3976 9126
      3976 9137 3973 9137 3969 9148
TIME...MOT...LOC 2133Z 232DEG 27KT 3975 9149

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Elmore
4 follow-up statements
721 
WWUS53 KLSX 272141 RRA
SVSLSX

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

MOC127-272151-
/O.CAN.KLSX.TO.W.0043.000000T0000Z-260427T2230Z/
Marion MO-
441 PM CDT Mon Apr 27 2026

...TORNADO WARNING IS CANCELLED FOR EASTERN MARION COUNTY IN
NORTHEASTERN MISSOURI...

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

&&

LAT...LON 3993 9142 4020 9117 4019 9091 4010 9091
      4010 9070 4008 9071 4008 9067 4005 9068
      4004 9065 3976 9126 3976 9137 3980 9137
      3984 9143 3987 9145
TIME...MOT...LOC 2134Z 232DEG 27KT 3976 9148

$$


ILC001-009-272230-
/O.CON.KLSX.TO.W.0043.000000T0000Z-260427T2230Z/
Adams IL-Brown IL-
441 PM CDT Mon Apr 27 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR ADAMS AND
NORTHWESTERN BROWN COUNTIES...

At 441 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Fall Creek, or 7 miles southeast of Quincy, moving
northeast at 40 mph. Another storm northeast of Quincy is capable of
producing a tornado.

HAZARD...Tornado and quarter size hail.

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.

This tornado will be near...
  Quincy, Payson and Fall Creek around 445 PM CDT.
  Quincy Regional Airport around 455 PM CDT.

Other locations impacted by the tornado include Marblehead, Burton,
Adams, Liberty, Fowler, Columbus, Paloma, Coatsburg, Mound Station
and La Prairie.

This includes Interstate 172 between exits 2 and 19.

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 3993 9142 4020 9117 4019 9091 4010 9091
      4010 9070 4008 9071 4008 9067 4005 9068
      4004 9065 3976 9126 3976 9137 3980 9137
      3984 9143 3987 9145
TIME...MOT...LOC 2134Z 232DEG 35KT 3981 9139

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Elmore
418 
WWUS53 KLSX 272148
SVSLSX

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

ILC001-009-272230-
/O.CON.KLSX.TO.W.0043.000000T0000Z-260427T2230Z/
Adams IL-Brown IL-
448 PM CDT Mon Apr 27 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EASTERN
ADAMS AND NORTHWESTERN BROWN COUNTIES...

At 448 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Quincy Regional Airport, moving northeast at 45 mph.
Another storm capable of producing a tornado was located near Camp
Point moving northeast at 45 mph.

HAZARD...Tornado and quarter size hail.

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.

This tornado will be near...
  Quincy Regional Airport and Quincy around 450 PM CDT.
  Camp Point around 505 PM CDT.

Other locations impacted by the tornado include Burton, Fowler,
Adams, Liberty, Columbus, Paloma, Coatsburg, La Prairie and Chatton.

This includes Interstate 172 between exits 14 and 19.

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 3996 9137 4020 9117 4019 9091 4010 9091
      4010 9070 4009 9071 4008 9071 4008 9067
      4005 9068 4004 9065 3984 9123
TIME...MOT...LOC 2141Z 229DEG 38KT 3988 9131

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Elmore
544 
WWUS53 KLSX 272156
SVSLSX

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

ILC001-009-272230-
/O.CON.KLSX.TO.W.0043.000000T0000Z-260427T2230Z/
Adams IL-Brown IL-
456 PM CDT Mon Apr 27 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
NORTHEASTERN ADAMS AND NORTHWESTERN BROWN COUNTIES...

At 456 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Golden, or 15 miles northeast of Quincy Regional
Airport, moving northeast at 45 mph.

HAZARD...Tornado and quarter size hail.

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.

This tornado will be near...
  Golden and Clayton around 500 PM CDT.

Other locations impacted by the tornado include La Prairie and
Chatton.

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 4010 9112 4019 9101 4019 9091 4010 9091
      4010 9070 4009 9071 4008 9071 4008 9067
      4000 9097
TIME...MOT...LOC 2148Z 229DEG 37KT 4004 9105

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Elmore
900 
WWUS53 KLSX 272203
SVSLSX

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

ILC001-009-272213-
/O.CAN.KLSX.TO.W.0043.000000T0000Z-260427T2230Z/
Adams IL-Brown IL-
503 PM CDT Mon Apr 27 2026

...TORNADO WARNING IS CANCELLED FOR NORTHEASTERN ADAMS AND
NORTHWESTERN BROWN COUNTIES...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However, small hail, gusty
winds, and heavy rain are still possible with this thunderstorm.

&&

LAT...LON 4010 9112 4019 9101 4019 9091 4010 9091
      4010 9070 4009 9071 4008 9071 4008 9067
      4000 9097
TIME...MOT...LOC 2156Z 229DEG 37KT 4009 9097

$$

Elmore

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, 4:35 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, 6:40 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Charles, Saint Louis48 min
Apr 27, 6:41 PM CDTTornado WarningLSXSaint Charles, Saint Louis32 min
Apr 27, 6:45 PM CDTSevere Thunderstorm WarningLSXCrawford45 min
Apr 27, 6:32 AM CDTSevere Thunderstorm WarningLSXClinton, Washington43 min
Apr 27, 7:03 AM CDTSevere Thunderstorm WarningLSXClinton, Marion, Washington57 min
Apr 27, 7:59 AM CDTSevere Thunderstorm WarningLSXGreene, Macoupin, Montgomery33 min
Apr 27, 8:57 AM CDTSevere Thunderstorm Warning Considerable damage threatLSXGreene, Pike48 min
Apr 27, 9:03 AM CDTTornado WarningLSXGreene, Pike42 min
Apr 27, 9:44 AM CDTSevere Thunderstorm WarningLSXGreene, Macoupin61 min

Nearby

Tornado Warnings in Illinois, 2026Tornado Warnings in Missouri, 2026Every tornado warning in 2026Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.