Alert archive / Missouri / Tornado Warnings in 2026
Tornado Warning 18, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 17, 2026, 6:23 PM CDT for Lewis County, Missouri; Adams County, Illinois. It was in force for 41 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 17, 2026, 6:23 PM CDT (23:23 UTC)
- Expired
- Apr 17, 2026, 7:04 PM CDT
- In force
- 41 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Adams County, IL, Lewis County, MO
The radar
The Quad Cities radar (KDVN), 177 km from the middle of the area, began a volume at 23:26 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 17, 3:31 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.4 hours before the alert went out and 250 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.
- Mixed-layer CAPE
- 84 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1053 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 164 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
605
WFUS53 KLSX 172323
TORLSX
ILC001-MOC111-180015-
/O.NEW.KLSX.TO.W.0018.260417T2323Z-260418T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
623 PM CDT Fri Apr 17 2026
The National Weather Service in St Louis has issued a
* Tornado Warning for...
Northwestern Adams County in west central Illinois...
Northern Lewis County in northeastern Missouri...
* Until 715 PM CDT.
* At 623 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles north of Lewistown, or 16 miles west of Canton,
moving east at 65 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...
Canton around 635 PM CDT.
Other locations impacted by the tornado include Monticello, Meyer,
Lima, Loraine and Woodville.
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.
Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!
&&
LAT...LON 4010 9188 4026 9187 4025 9150 4024 9150
4024 9151 4023 9150 4022 9150 4021 9151
4020 9151 4020 9117 4012 9119
TIME...MOT...LOC 2323Z 263DEG 56KT 4018 9182
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Elmore5 follow-up statements
115
WWUS53 KLSX 172332
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
632 PM CDT Fri Apr 17 2026
ILC001-MOC111-180015-
/O.CON.KLSX.TO.W.0018.000000T0000Z-260418T0015Z/
Adams IL-Lewis MO-
632 PM CDT Fri Apr 17 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHWESTERN ADAMS AND NORTHEASTERN LEWIS COUNTIES...
At 632 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles northwest of Canton, moving east at 65 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Canton around 635 PM CDT.
Other locations impacted by the tornado include Meyer, Lima, Loraine
and Woodville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!
&&
LAT...LON 4011 9174 4025 9174 4025 9150 4024 9151
4023 9150 4021 9151 4020 9151 4020 9117
4012 9119
TIME...MOT...LOC 2323Z 263DEG 56KT 4018 9181
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Elmore513
WWUS53 KLSX 172341 RRA
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
641 PM CDT Fri Apr 17 2026
ILC001-MOC111-180015-
/O.CON.KLSX.TO.W.0018.000000T0000Z-260418T0015Z/
Adams IL-Lewis MO-
641 PM CDT Fri Apr 17 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHWESTERN ADAMS AND NORTHEASTERN LEWIS COUNTIES...
At 641 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles northeast of Canton, moving east at 65 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.
Other locations impacted by the tornado include Lima, Meyer, Loraine
and Woodville.
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.
Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!
&&
LAT...LON 4011 9167 4025 9159 4025 9150 4024 9151
4023 9150 4022 9151 4020 9151 4020 9117
4012 9119
TIME...MOT...LOC 2332Z 263DEG 56KT 4020 9163
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Elmore366
WWUS53 KLSX 172349
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
649 PM CDT Fri Apr 17 2026
MOC111-172359-
/O.CAN.KLSX.TO.W.0018.000000T0000Z-260418T0015Z/
Lewis MO-
649 PM CDT Fri Apr 17 2026
...TORNADO WARNING IS CANCELLED FOR NORTHEASTERN LEWIS COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with this thunderstorm.
A Tornado Watch remains in effect until 1100 PM CDT Friday for a
portion of northeast Missouri.
&&
LAT...LON 4011 9147 4020 9139 4020 9117 4012 9119
TIME...MOT...LOC 2341Z 263DEG 56KT 4021 9145
$$
ILC001-180015-
/O.CON.KLSX.TO.W.0018.000000T0000Z-260418T0015Z/
Adams IL-
649 PM CDT Fri Apr 17 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHWESTERN ADAMS COUNTY...
At 649 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles north of Mendon, or 15 miles east of Canton,
moving east at 70 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.
Other locations impacted by the tornado include Loraine, Lima and
Woodville.
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.
Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!
&&
LAT...LON 4011 9147 4020 9139 4020 9117 4012 9119
TIME...MOT...LOC 2341Z 269DEG 58KT 4019 9143
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Elmore843
WWUS53 KLSX 172356
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
656 PM CDT Fri Apr 17 2026
ILC001-180015-
/O.CON.KLSX.TO.W.0018.000000T0000Z-260418T0015Z/
Adams IL-
656 PM CDT Fri Apr 17 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR NORTH
CENTRAL ADAMS COUNTY...
At 656 PM CDT, a severe thunderstorm capable of producing a tornado
was located 8 miles northwest of Golden, or 18 miles north of Quincy
Regional Airport, moving east at 70 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
Other locations impacted by the tornado include Woodville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!
&&
LAT...LON 4012 9135 4020 9128 4020 9117 4012 9119
TIME...MOT...LOC 2349Z 269DEG 58KT 4019 9126
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
Elmore850 WWUS53 KLSX 180004 SVSLSX Severe Weather Statement National Weather Service St Louis MO 704 PM CDT Fri Apr 17 2026 ILC001-180014- /O.CAN.KLSX.TO.W.0018.000000T0000Z-260418T0015Z/ Adams IL- 704 PM CDT Fri Apr 17 2026 ...TORNADO WARNING IS CANCELLED FOR NORTH CENTRAL ADAMS COUNTY... The storm which prompted the warning has weakened below severe limits, and has exited the warned area. Therefore, the warning has been cancelled. However, gusty winds are still possible with this thunderstorm. A Tornado Watch remains in effect until 1100 PM CDT Friday for a portion of west central Illinois. && LAT...LON 4012 9135 4020 9128 4020 9117 4012 9119 TIME...MOT...LOC 2356Z 269DEG 58KT 4020 9112 $$ Elmore
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 7:57 AM CDT | Flood Watch | LSX | Audrain, Boone, Callaway, Cole, Knox, Lewis and 9 more | 19 hr |
| Apr 17, 3:06 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Callaway | 39 min |
| Apr 17, 3:10 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 50 min |
| Apr 17, 3:26 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 49 min |
| Apr 17, 3:30 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis, Shelby | 45 min |
| Apr 17, 3:39 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Pike | 49 min |
| Apr 17, 3:40 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Monroe, Ralls | 37 min |
| Apr 17, 3:45 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 32 min |
| Apr 17, 4:04 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis | 23 min |
| Apr 17, 4:11 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 25 min |
| Apr 17, 5:03 PM CDT | Tornado Warning | LSX | Knox, Lewis, Shelby | 42 min |
| Apr 17, 5:38 PM CDT | Tornado Warning | LSX | Lewis | 52 min |
| Apr 17, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Shelby | 54 min |
| Apr 17, 5:58 PM CDT | Tornado Warning | LSX | Knox | 32 min |
| Apr 17, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 47 min |
| Apr 17, 6:46 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis, Marion, Monroe, Ralls, Shelby | 44 min |
| Apr 17, 4:22 PM CDT | Severe Thunderstorm Warning | LSX | Brown, Pike | 38 min |
| Apr 17, 6:53 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 52 min |
Nearby
Tornado Warnings in Missouri, 2026Tornado Warnings in Illinois, 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.