Alert archive / Missouri / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 154, NWS St. Louis, MO

May 31, 2026Iron County, Madison County, Saint Francois County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 31, 2026, 2:23 PM CDT for Iron County, Madison County, Saint Francois County, Missouri. It was in force for 58 min. 11 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: May 31, 2026, 2:23 PM CDT (19:23 UTC)
Expired: May 31, 2026, 3:21 PM CDT
In force: 58 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Iron County, MO, Madison County, MO, Saint Francois County, MO

The radar

The St Louis radar (KLSX), 130 km from the middle of the area, began a volume at 19:25 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

Time	Report	Where	Remark
May 31, 2:25 PM CDT	TSTM WND DMG	1 Ese Doe Run, MO	Via Facebook: Large, healthy tree downed across driveway. Tree pulled powerlines to the ground, but did not completely down them.
May 31, 2:25 PM CDT	TSTM WND DMG	3 Nw Knob Lick, MO	Via Facebook: A large healthy tree downed across Hwy AA near Farmington.
May 31, 2:30 PM CDT	TSTM WND DMG	4 W Knob Lick, MO	Report of numerous trees down in the southern portion of St. Francois County. Time estimated from radar.
May 31, 2:35 PM CDT	TSTM WND DMG	1 Nnw Catherine Place, MO	50-60 mph estimated winds with small limbs down. Time estimated from radar.
May 31, 2:40 PM CDT	TSTM WND DMG	1 Ese Junction City, MO	Corrects previous tstm wnd dmg report from 1 ESE Junction City. Large, healthy tree downed across County Road 212 near Private Drive 9277 (Behind Station at Sawers Landing).
May 31, 2:40 PM CDT	TSTM WND DMG	1 Sse Fredericktown, MO	Corrects previous tstm wnd dmg report from 1 SSE Fredericktown. A medium/large healthy tree downed on a home in Fredericktown.
May 31, 2:45 PM CDT	TSTM WND DMG	1 N Mine La Motte, MO	Via Facebook: Very large, healthy branches split from tree. Some branches fell on a double wide residence and caused damage to gutters and roof. Extent of damage unknown.
May 31, 2:45 PM CDT	TSTM WND DMG	8 Ssw Fredericktown, MO	Via Facebook: Lots of trees and powerlines down in Madison County.
May 31, 2:50 PM CDT	TSTM WND DMG	2 Wsw Libertyville, MO	Estimated 50-60 mph winds with small tree limbs down and debris on DD between OO and Highway 67.
May 31, 2:50 PM CDT	TSTM WND DMG	3 E Junction City, MO	Extensive damage across farmstead. What appears to be a farm outbuilding was collapsed and a wooden beam was lodged into the top of a garage. Debris all over yard. Debris fell onto GMC Denali which broke off its tailgate and damaged the hood and nearby frame.
May 31, 2:50 PM CDT	TSTM WND DMG	3 E Junction City, MO	Via Facebook: A large, rotted tree snapped near its base and took down powerlines on County Road 221 near Hwy J. A small/medium tree was snapped near its base.

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 11 storm reports to this severe thunderstorm warning; the first came 2 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.4 hours before the alert went out and 301 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1943 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.5

Open this sounding in Storm Lab

The text

As transmitted.

105 
WUUS53 KLSX 311923
SVRLSX
MOC093-123-187-312045-
/O.NEW.KLSX.SV.W.0154.260531T1923Z-260531T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
223 PM CDT Sun May 31 2026

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Eastern Iron County in southeastern Missouri...
  Madison County in southeastern Missouri...
  Saint Francois County in southeastern Missouri...

* Until 345 PM CDT.

* At 223 PM CDT, severe thunderstorms were located along a line from
  near Farmington to near Annapolis, or along a line from near
  Farmington to 21 miles south of Ironton, moving east at 15 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...
  Bismarck, Leadwood, Pilot Knob, Iron Mountain, Ironton, Iron
  Mountain Lake, Arcadia, Park Hills, Desloge, Glover, Roselle,
  Farmington, Annapolis, Knob Lick, Fredericktown, Junction City,
  Saco, Cobalt, Buckhorn and Marquand.

This includes the following State Parks...
St. Joe State Park, Fort Davidson Historic Site and Missouri Mines
Historic Site.

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.

&&

LAT...LON 3748 9077 3773 9065 3787 9064 3788 9046
      3767 9020 3770 9015 3767 9011 3764 9015
      3731 9015 3732 9055 3727 9055 3727 9075
      3737 9075 3737 9077
TIME...MOT...LOC 1923Z 285DEG 14KT 3784 9043 3754 9052 3731 9075

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

$$

Delia

3 follow-up statements

475 
WWUS53 KLSX 311942
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
242 PM CDT Sun May 31 2026

MOC093-123-187-312045-
/O.CON.KLSX.SV.W.0154.000000T0000Z-260531T2045Z/
Iron MO-Madison MO-Saint Francois MO-
242 PM CDT Sun May 31 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT FOR
SOUTHEASTERN IRON, MADISON AND SOUTHEASTERN SAINT FRANCOIS COUNTIES
IN SOUTHEASTERN MISSOURI...

At 242 PM CDT, severe thunderstorms were located along a line from 6
miles northeast of Farmington to 5 miles southeast of Annapolis, or
along a line from 6 miles northeast of Farmington to 21 miles south
of Ironton, moving east at 15 mph.

HAZARD...60 mph wind gusts and small hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Ironton, Arcadia, Park Hills, Glover, Leadington, Doe Run, Roselle,
  Farmington, Annapolis, Knob Lick, Des Arc, Catherine Place,
  Libertyville, Fredericktown, Junction City, Saco, Mine La Motte,
  Cobalt, Buckhorn and Marquand.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3742 9077 3776 9050 3788 9046 3783 9040
      3781 9038 3781 9037 3767 9020 3770 9015
      3767 9011 3764 9015 3731 9015 3732 9024
      3731 9034 3732 9055 3727 9055 3727 9075
      3737 9075 3737 9077
TIME...MOT...LOC 1923Z 285DEG 14KT 3784 9043 3754 9051 3731 9075

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

$$

Delia

561 
WWUS53 KLSX 312016
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
316 PM CDT Sun May 31 2026

MOC093-312026-
/O.CAN.KLSX.SV.W.0154.000000T0000Z-260531T2045Z/
Iron MO-
316 PM CDT Sun May 31 2026

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

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

&&

LAT...LON 3753 9034 3772 9027 3767 9020 3770 9015
      3767 9011 3764 9015 3731 9015 3731 9018
      3732 9024 3732 9028 3731 9035 3732 9047
      3732 9055
TIME...MOT...LOC 1942Z 285DEG 14KT 3782 9034 3752 9042 3729 9066

$$


MOC123-187-312045-
/O.CON.KLSX.SV.W.0154.000000T0000Z-260531T2045Z/
Madison MO-Saint Francois MO-
316 PM CDT Sun May 31 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT FOR
MADISON AND SOUTHEASTERN SAINT FRANCOIS COUNTIES IN SOUTHEASTERN
MISSOURI...

At 316 PM CDT, severe thunderstorms were located along a line from
over Coffman to 8 miles south of Saco, or along a line from 14 miles
east of Farmington to 24 miles southwest of Fredericktown, moving
east at 15 mph.

HAZARD...60 mph wind gusts and small hail.

SOURCE...Law enforcement reported 60 mph winds in Libertyville and
         Fredericktown.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Fredericktown, Junction City, Saco, Mine La Motte, Cobalt, Buckhorn
  and Marquand.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3753 9034 3772 9027 3767 9020 3770 9015
      3767 9011 3764 9015 3731 9015 3731 9018
      3732 9024 3732 9028 3731 9035 3732 9047
      3732 9055
TIME...MOT...LOC 1942Z 285DEG 14KT 3782 9034 3752 9042 3729 9066

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

$$

Delia

121 
WWUS53 KLSX 312021
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
321 PM CDT Sun May 31 2026

MOC123-187-312031-
/O.CAN.KLSX.SV.W.0154.000000T0000Z-260531T2045Z/
Madison MO-Saint Francois MO-
321 PM CDT Sun May 31 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR MADISON AND
SOUTHEASTERN SAINT FRANCOIS COUNTIES IN SOUTHEASTERN MISSOURI...

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

&&

LAT...LON 3753 9034 3772 9027 3767 9020 3770 9015
      3767 9011 3764 9015 3731 9015 3731 9018
      3732 9024 3732 9028 3731 9035 3732 9047
      3732 9055
TIME...MOT...LOC 2016Z 285DEG 14KT 3779 9017 3748 9026 3725 9049

$$

Delia

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 May 31, 12:29 PM CDT, 1 hour 54 minutes earlier. Its key messages:

There will be several chances of showers and thunderstorms through tomorrow with a low chance of severe thunderstorms capable of producing large hail and damaging winds.
Dry weather is forecast Tuesday through Thursday along with near normal temperatures.

Area forecast discussion, May 31, 12:29 PM CDT, 1 hour 54 minutes before

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1229 PM CDT Sun May 31 2026

.KEY MESSAGES...

- There will be several chances of showers and thunderstorms through
  tomorrow with a low chance of severe thunderstorms capable of
  producing large hail and damaging winds.

- Dry weather is forecast Tuesday through Thursday along with near
  normal temperatures.

&&

.SHORT TERM...  (Through Late Monday Afternoon)
Issued at 418 AM CDT Sun May 31 2026

Patchy fog has developed over parts of the area like yesterday
morning with varying visibilities.  With light winds and yesterday's
rainfall, visibilities have fallen as low as 1/4 mile so far at SUS
and CPS, but have since climbed back up to 10 miles.  With the
clouds overhead and the relatively short night, I suspect any dense
fog will stay patchy the rest of the night.

There will the potential for several rounds of showers and
thunderstorms to move across parts of the CWA through Monday.  There
remains a strong CAPE gradient that is expected to remain in place
from west to east in addition to the persistent low level
convergence axis.  Showers and thunderstorms currently over western
Missouri are slowly moving east, and may move into central Missouri
early this morning.  An upper trough over the central Plains will
lift northeast this morning and supply decent ascent over the area
this afternoon.  The CAMS are showing an increase in convection over
the area by mid afternoon into this evening, though they are
inconsistent with their timing and location.  This is likely because
there will be an upper ridge building over Missouri and Illinois
today causing weak steering currents. The CAMS are also showing
some redevelopment of the thunderstorms over northern Missouri
this evening that will move into the CWA overnight. Both of these
rounds will have some potential of isolated severe thunderstorms
in the SPC marginal risk with up to 1" hail and 60 mph winds,
though the coverages an severity of storms will be dependent on
the previous rounds of storms. There will also be the potential
for heavy rainfall to produce localized flooding, particularly
over central and southeast Missouri where PWATS will be around
1.8" with warm cloud depths over 10k feet.

The CAMS are showing the second round of convection exiting the
CWA by 12Z on Monday. Both the RAP/GFS is showing a front
lingering back across central and southeast Missouri during the
day with sufficient CAP/shear to bring the risk of an isolated
strong to severe thunderstorm.

Britt

&&

.LONG TERM...  (Monday Night through Saturday)
Issued at 418 AM CDT Sun May 31 2026

Model guidance is consistent showing an upper high moving south
across Midwest Tuesday into Thursday resulting in dry weather across
the CWA during this period.  The chance for showers and
thunderstorms will return beginning on Thursday night and continues
into Saturday when moisture return will increase ahead of upper low
over the Plains.  The LREF is showing 40-60% of its members
producing rain over the CWA by Saturday.

WHile temperatures may cool down to around 80 on Tuesday and
Wednesday, highs are forecast to be mainly in 80s this week as they
climb back into the upper 80s by Friday and Saturday.

Britt

&&

.AVIATION...  (For the 18z TAFs through 18z Monday Afternoon)
Issued at 1224 PM CDT Sun May 31 2026

An area of showers/weak thunderstorms to the west of the metro
terminals is expected to slide south and weaken with time/eastward
extent. Much of the afternoon/early evening may tend to be dry
across the area, but more widespread showers and thunderstorms are
expected overnight tonight into the early morning hours on Monday.
While confidence in details (timing, longevity, areas impacted) is
not very high, it does look like KCOU/KJEF have the best chance of
seeing the greatest impacts. This is where the storms may be a bit
stronger, so expect IFR visibilities in heavier cores and possibly
some small hail/gusty winds as well. The thunderstorms should move
out from west/northwest to east/southeast with time, leaving
dry conditions behind it for much of the area Monday morning.

Gosselin

&&

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

WFO LSX

In the hours before

Local storm report, May 31, 1:27 PM CDT, 56 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
127 PM CDT Sun May 31 2026

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

0123 PM     Hail             1 SSW Latty             37.97N 90.90W
05/31/2026  M0.50 Inch       Washington         MO   Trained Spotter

&&

JPG

Local storm report, May 31, 1:56 PM CDT, 27 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
156 PM CDT Sun May 31 2026

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

0155 PM     Hail             Belgrade                37.79N 90.85W
05/31/2026  E0.50 Inch       Washington         MO   Trained Spotter

&&

JPG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 1:08 PM CDT	Severe Thunderstorm Warning	LSX	Washington	27 min
May 31, 1:48 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds, Washington	42 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2026 Every 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.