Severe Thunderstorm Warning 218, NWS St. Louis, MO

399 
WWUS53 KLSX 110154
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
854 PM CDT Fri Jul 10 2026

ILC083-110204-
/O.CAN.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Jersey IL-
854 PM CDT Fri Jul 10 2026

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

The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled. However, heavy rain is
still possible with these thunderstorms.

&&

LAT...LON 3854 9038 3876 9024 3895 9028 3899 9027
      3900 9027 3900 9015 3897 8983 3873 8983
      3846 8995 3852 9026
TIME...MOT...LOC 0140Z 278DEG 36KT 3891 9031 3877 9029 3861 9040

$$


ILC119-163-MOC183-189-510-110230-
/O.CON.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Madison IL-Saint Clair IL-Saint Charles MO-Saint Louis MO-Saint
Louis City MO-
854 PM CDT Fri Jul 10 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
WESTERN MADISON AND NORTHWESTERN SAINT CLAIR COUNTIES IN SOUTHWESTERN
ILLINOIS, NORTHEASTERN SAINT CHARLES AND NORTHEASTERN SAINT LOUIS
COUNTIES IN EAST CENTRAL MISSOURI AND THE SAINT LOUIS CITY IN EAST
CENTRAL MISSOURI...

At 854 PM CDT, severe thunderstorms were located along a line from
over East Alton to over Cahokia Parks Airport, or along a line from
over Bethalto to over East St. Louis, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Clayton, Jennings, Crestwood, Bellefontaine Neighbors, St. Louis,
  Webster Groves, Godfrey, Alton, Granite City, East St. Louis,
  Edwardsville, Cahokia, Glen Carbon, Collinsville, Belleville,
  Fairview Heights, Swansea, Shiloh and O'Fallon.

This includes the following State Parks...
Frank Holten State Park, Horseshoe Lake State Park, Scott Joplin
Historic Site and Confluence State Park.

This includes the following highways...
Interstate 64 in Illinois between exits 9 and 14. Interstate 55 in
Illinois between exits 23 and 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
Seek shelter immediately inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3854 9038 3876 9024 3895 9028 3899 9027
      3900 9027 3900 9015 3897 8983 3873 8983
      3846 8995 3852 9026
TIME...MOT...LOC 0140Z 272DEG 43KT 3891 9030 3878 9028 3862 9039

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LE

757 
WWUS53 KLSX 110205
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
905 PM CDT Fri Jul 10 2026

ILC163-MOC183-189-510-110215-
/O.CAN.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Saint Clair IL-Saint Charles MO-Saint Louis MO-Saint Louis City
MO-
905 PM CDT Fri Jul 10 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR NORTHWESTERN SAINT
CLAIR, NORTHEASTERN SAINT CHARLES AND NORTHEASTERN SAINT LOUIS
COUNTIES AND THE SAINT LOUIS CITY...

The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled. However, heavy rain is
still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1200 AM CDT for
portions of southwest Illinois and east central Missouri.

&&

LAT...LON 3869 9014 3877 9013 3879 9014 3880 9012
      3881 9012 3884 9011 3885 9011 3888 9017
      3895 9020 3900 9019 3900 9015 3897 8983
      3873 8983 3867 8986
TIME...MOT...LOC 0154Z 272DEG 43KT 3890 9009 3877 9006 3861 9018

$$


ILC119-110230-
/O.CON.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Madison IL-
905 PM CDT Fri Jul 10 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
CENTRAL MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

At 905 PM CDT, severe thunderstorms were located along a line from
over Carpenter to over Troy, or along a line from 6 miles east of
Bethalto to over Troy, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Godfrey, Alton, Granite City, Wood River, East Alton, Hartford,
  Pontoon Beach, Roxana, Rosewood Heights, South Roxana,
  Edwardsville, Bethalto, Glen Carbon, Collinsville, Dorsey,
  Maryville, Troy, Carpenter and Worden.

This includes the following State Parks...
Horseshoe Lake State Park.

This includes Interstate 55 in Illinois between exits 23 and 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
Seek shelter immediately inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3869 9014 3877 9013 3879 9014 3880 9012
      3881 9012 3884 9011 3885 9011 3888 9017
      3895 9020 3900 9019 3900 9015 3897 8983
      3873 8983 3867 8986
TIME...MOT...LOC 0154Z 272DEG 43KT 3890 9009 3875 9007

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LE

278 
WWUS53 KLSX 110211
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
911 PM CDT Fri Jul 10 2026

ILC119-110230-
/O.CON.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Madison IL-
911 PM CDT Fri Jul 10 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
CENTRAL MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

At 911 PM CDT, severe thunderstorms were located along a line from
over Worden to near St. Jacob, or along a line from 9 miles south of
Staunton to near Troy, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Pontoon Beach, Roxana, Edwardsville, Bethalto, Glen Carbon,
  Collinsville, Dorsey, Maryville, Prairietown, Troy, Carpenter,
  Kuhn, Fruit, Hamel and Worden.

This includes Interstate 55 in Illinois between exits 23 and 30.

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 3890 9005 3899 9006 3897 8983 3873 8983
      3867 8986 3868 9004 3879 9003
TIME...MOT...LOC 0205Z 272DEG 43KT 3890 8992 3874 8991

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LE

131 
WWUS53 KLSX 110220
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
920 PM CDT Fri Jul 10 2026

ILC119-110230-
/O.CON.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Madison IL-
920 PM CDT Fri Jul 10 2026

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
CENTRAL MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

At 920 PM CDT, severe thunderstorms were located along a line from
over Alhambra to over Highland, or along a line from 9 miles north of
Highland to over Highland, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Edwardsville, Glen Carbon, Prairietown, Carpenter, Kuhn, Fruit,
  Hamel and Worden.

This includes Interstate 55 in Illinois between exits 23 and 30.

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 3888 8995 3898 8995 3897 8983 3873 8983
      3875 8995
TIME...MOT...LOC 0211Z 272DEG 43KT 3889 8983 3874 8981

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LE

684 
WWUS53 KLSX 110227
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
927 PM CDT Fri Jul 10 2026

ILC119-110237-
/O.EXP.KLSX.SV.W.0218.000000T0000Z-260711T0230Z/
Madison IL-
927 PM CDT Fri Jul 10 2026

...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 930 PM CDT FOR CENTRAL
MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However, heavy rain
is still possible with these thunderstorms.

&&

LAT...LON 3888 8995 3898 8995 3897 8983 3873 8983
      3875 8995
TIME...MOT...LOC 0220Z 272DEG 43KT 3889 8968 3873 8966

$$

LE

Area Forecast Discussion
National Weather Service St Louis MO
252 PM CDT Fri Jul 10 2026

.KEY MESSAGES...

- The threat for (additional) flash flooding remains the top
  concern through Saturday. Areas that saw 6-12+" of rain are
  most susceptible to additional flooding.

- A few storms may be strong to severe this afternoon/evening
  and again Saturday afternoon. Damaging winds are the primary
  threat.

- Drier weather with temperatures close to normal is forecast
  Sunday into next week.

&&

.SHORT TERM /THROUGH SATURDAY/...
Issued at 248 PM CDT Fri Jul 10 2026

GOES-19 water vapor imagery shows a pronounced midlevel
shortwave across the mid-Missouri Valley moving east. Lift along
with cooling temperatures aloft should help initiate additional
convection over the next couple of hours, most likely
east/southeast along a weak surface frontal boundary/trough
axis. This is where convergence is strongest near the surface.
There may also be another more subtle disturbance in southeast
Kansas/southwest Missouri. This feature is also moving east, and
instability is building downstream across southeast Missouri.
The latest SPC mesoanalysis shows over 2000 J/kg of MLCAPE with
little/no CIN. There is not perfect overlap between the higher
instability (in southeast Missouri) with the higher effective
shear, which resides in northeast Missouri downstream of the
aforementioned midlevel shortwave trough. A few storms across
the area may be strong to severe from late this afternoon
through mid/late evening, with damaging winds the primary
threat.

The main concern however continues to be on the heavy rainfall
threat and the potential for renewed flash flooding. Weather wise,
we are expecting the coverage of showers and thunderstorms to
increase late this evening into the early overnight hours as the low-
level jet strengthens. The jet is quite a bit weaker than last
night, so we are not expecting as much organization as last night
and overall amounts should be a lot less. However, ANY significant
rainfall in the northwest-southeast axis across southeast Missouri
that saw 6-12+" of rain will be of greatest concern and
susceptibility. Unfortunately, it does appear that areas south of I-
70 in Missouri are more likely to see the heavier rainfall totals
tonight. The LPMM of the HREF and REFS show pockets of 1" to as much
as 3" through Saturday morning, and this aligns well with our
expectations.

The synoptic midlevel shortwave trough is forecast to gradually move
south/southeast on Saturday beneath the amplifying mid/upper level
ridge. The wave has trended farther south/southwest (and slower)
with time. That means a continued threat for at least scattered
showers and thunderstorms through much of the day on Saturday, with
a focus along/ahead of this feature. That means east/southeast
Missouri and southwest Illinois will be most favored for additional
showers/thunderstorms. Needless to say, any rainfall in parts of
southeast Missouri would not be good. Total rain amounts of 2-4"
through Saturday afternoon are possible in the watch area, with
locally higher amounts potentially within locations that get
repeatedly impacted.

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
Issued at 248 PM CDT Fri Jul 10 2026

(Saturday Night - Sunday)

The midlevel wave/closed low should move far enough south to end the
heavy rainfall threat Saturday night, though we will have to keep a
close eye on its equatorward progression. Even slower guidance
though focuses the low-level jet well to the south of our CWA, so
while some shower activity or even a rumble of thunder may linger in
our southern counties early Saturday night, the expectation is for
the threat for (new) flash flooding to be over.

Isolated to widely scattered showers/weak thunderstorms may
redevelop Sunday afternoon near the closed low/shear axis. Similar
to Saturday night though, the threat for flash flooding looks quite
low. The atmosphere is also not as supportive as warm cloud depths
are not as deep and precipitable water values drop to near 1.6"
(~75th percentile) of climatology. Therefore, any individual
showers/weak thunderstorms should not be nearly as efficient as days
prior.

(Sunday Night - Next Friday)

There has been a subtle shift in the mid/upper level pattern into
early/mind next week. While the record-breaking ridge will still
build to our north across the northern Plains and Upper Midwest, the
pesky midlevel shortwave/shear axis now seems likely to retrograde
westward around the southern periphery of the ridge. This means
continued low (~15-30%) chances of showers/weak thunderstorms mainly
in central/southeast Missouri and focused diurnally. Similar to
Saturday night/Sunday, there should not be any real organization or
threat for strong-severe convection nor flash flooding. The
proximity of the midlevel shortwave/shear axis though should tend to
lead to cooler temperatures due to the rain chances mentioned above
and associated cloud cover. Temperatures are now likely to stay
close to normal through at least the middle of next week, if not the
entire week.

&&

.AVIATION /18Z TAFS THROUGH 00Z SUNDAY/...
Issued at 1221 PM CDT Fri Jul 10 2026

Scattered showers and thunderstorms are expected to redevelop by
mid-late afternoon. There is uncertainty on where storms will be
favored initially, but should tend to shift southward overnight
into Saturday. Brief reductions in visibility along with the
possibility of gusty winds are the main concerns from an
aviation perspective. Lower ceilings are also expected to
develop late tonight, with the best chances at KCOU/KJEF.

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Flood Watch through Saturday evening for MOZ047>049-059-062-
     065-072>075-084-085-099.
IL...Flood Watch through Saturday evening for ILZ079-102.

&&

SHORT TERM...Gosselin
LONG TERM...Gosselin
AVIATION...Gosselin

Preliminary Local Storm Report
National Weather Service St Louis MO
814 PM CDT Fri Jul 10 2026

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

0620 PM     Tstm Wnd Dmg     4 E Harrisburg          39.13N 92.38W
07/10/2026                   Boone              MO   Emergency Mngr

            Multiple trees down across roadways, and
            down power lines.

&&

Asel

Preliminary Local Storm Report
National Weather Service St Louis MO
815 PM CDT Fri Jul 10 2026

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

0750 PM     Tstm Wnd Dmg     Wright City             38.83N 91.03W
07/10/2026                   Warren             MO   Emergency Mngr

            Multiple trees down across Wright City.

&&

Asel

Preliminary Local Storm Report
National Weather Service St Louis MO
830 PM CDT Fri Jul 10 2026

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

0800 PM     Tstm Wnd Dmg     5 NE Moscow Mills       39.00N 90.86W
07/10/2026                   Lincoln            MO   Emergency Mngr

            Power lines down near Hwy 47 and W
            intersection, time estimated.

&&

Asel

Preliminary Local Storm Report
National Weather Service St Louis MO
833 PM CDT Fri Jul 10 2026

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

0825 PM     Non-Tstm Wnd Gst 3 ESE Kampville         38.84N 90.49W
07/10/2026  M63 MPH          St. Charles        MO   Public

            backyard weather station in New Town
            measured 63 mph.

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
836 PM CDT Fri Jul 10 2026

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

0755 PM     Non-Tstm Wnd Dmg Foristell               38.82N 90.96W
07/10/2026                   St. Charles        MO   Emergency Mngr

            2 power poles snapped in half. time
            estimated.

&&

Preliminary Local Storm Report
National Weather Service St Louis MO
840 PM CDT Fri Jul 10 2026

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

0755 PM     Tstm Wnd Dmg     Foristell               38.82N 90.96W
07/10/2026                   St. Charles        MO   Emergency Mngr

            Corrects previous non-tstm wnd dmg report
            from Foristell. 2 power poles snapped in
            half. time estimated.

&&