Alert archive / Illinois / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 213, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 10, 2026, 6:37 PM CDT for Randolph County, Washington County, Illinois. It was in force for 38 min. 1 report 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
- Jul 10, 2026, 6:37 PM CDT (23:37 UTC)
- Expired
- Jul 10, 2026, 7:15 PM CDT
- In force
- 38 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Randolph County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 113 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 10, 7:09 PM CDT | TSTM WND DMG | Blair, IL | Tree down over the roadway. |
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 one storm report to this severe thunderstorm warning; the first came 32 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
Lincoln, IL (KILX), launched 12:00Z, 11.6 hours before the alert went out and 260 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
- 535 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 763 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
208
WUUS53 KLSX 102337
SVRLSX
ILC157-189-110015-
/O.NEW.KLSX.SV.W.0213.260710T2337Z-260711T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
637 PM CDT Fri Jul 10 2026
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southern Washington County in south central Illinois...
Randolph County in southwestern Illinois...
* Until 715 PM CDT.
* At 637 PM CDT, severe thunderstorms were located along a line from
near Coulterville to near Evansville, or along a line from near
Sparta to 6 miles northeast of Ste. Genevieve, moving southeast at
20 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...
Preston, Evansville, Sparta, Tilden, Walsh, Eden, Coulterville,
Roots, Blair, Ellis Grove, New Palestine, Steeleville, Percy,
Bremen, Welge, Chester, Shiloh Hill and Rockwood.
This includes the following State Parks...
Piney Creek Ravine State Natural Area, Randolph County State
Recreation Area, World Shooting and Recreational Complex and Turkey
Bluffs State Fish and Wildlife Area.
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 3809 9007 3814 8979 3825 8965 3822 8957
3822 8959 3796 8960 3783 8966 3782 8968
3780 8967 3785 8974 3785 8979 3788 8980
3790 8985
TIME...MOT...LOC 2337Z 307DEG 17KT 3813 8963 3805 8974 3802 8996
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
LE2 follow-up statements
364
WWUS53 KLSX 110009
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
709 PM CDT Fri Jul 10 2026
ILC189-110019-
/O.CAN.KLSX.SV.W.0213.000000T0000Z-260711T0015Z/
Washington IL-
709 PM CDT Fri Jul 10 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHERN WASHINGTON
COUNTY IN SOUTH CENTRAL ILLINOIS...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been cancelled. However, heavy rain is still possible with these
thunderstorms.
&&
LAT...LON 3794 8990 3805 8978 3812 8959 3796 8960
3786 8966 3783 8966 3782 8968 3780 8967
3785 8974 3785 8979 3788 8980 3790 8984
3790 8985
TIME...MOT...LOC 2337Z 307DEG 17KT 3813 8963 3805 8974 3802 8996
$$
ILC157-110015-
/O.CON.KLSX.SV.W.0213.000000T0000Z-260711T0015Z/
Randolph IL-
709 PM CDT Fri Jul 10 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
SOUTHEASTERN RANDOLPH COUNTY...
At 709 PM CDT, severe thunderstorms were located along a line from 6
miles northeast of Percy to over Chester, or along a line from 10
miles southeast of Sparta to over Chester, moving southeast at 20
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...
Blair, New Palestine, Steeleville, Bremen, Percy, Chester, Welge,
Shiloh Hill and Rockwood.
This includes the following State Parks...
Piney Creek Ravine State Natural Area, Randolph County State
Recreation Area and Turkey Bluffs State Fish and Wildlife Area.
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 3794 8990 3805 8978 3812 8959 3796 8960
3786 8966 3783 8966 3782 8968 3780 8967
3785 8974 3785 8979 3788 8980 3790 8984
3790 8985
TIME...MOT...LOC 2337Z 308DEG 16KT 3817 8969 3807 8980 3802 8996
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
LE716
WWUS53 KLSX 110013
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
713 PM CDT Fri Jul 10 2026
ILC157-110023-
/O.EXP.KLSX.SV.W.0213.000000T0000Z-260711T0015Z/
Randolph IL-
713 PM CDT Fri Jul 10 2026
...SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 715 PM CDT FOR
SOUTHEASTERN RANDOLPH COUNTY...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire. However, heavy rain is still possible with
these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1200 AM CDT for a
portion of southwest Illinois.
&&
LAT...LON 3794 8990 3805 8978 3812 8959 3796 8960
3786 8966 3783 8966 3782 8968 3780 8967
3785 8974 3785 8979 3788 8980 3790 8984
3790 8985
TIME...MOT...LOC 0009Z 309DEG 16KT 3808 8955 3798 8965 3793 8981
$$
LEWhat 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 Jul 10, 2:52 PM CDT, 3 hours 45 minutes earlier. Its 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.
Area forecast discussion, Jul 10, 2:52 PM CDT, 3 hours 45 minutes before
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...GosselinIn the hours before
Local storm report, Jul 10, 6:27 PM CDT, 10 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
627 PM CDT Fri Jul 10 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0622 PM Tstm Wnd Dmg 3 ESE Midway 38.96N 92.40W
07/10/2026 Boone MO Emergency Mngr
6 inch diameter tree down.
&&
AselLocal storm report, Jul 10, 6:34 PM CDT, 3 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
634 PM CDT Fri Jul 10 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0610 PM Tstm Wnd Dmg 1 SE Harrisburg 39.13N 92.44W
07/10/2026 Boone MO Emergency Mngr
Tree down across roadway near Hwy 124 and
Route E intersection.
&&
AselLocal storm report, Jul 10, 6:37 PM CDT, 0 minutes before
Preliminary Local Storm Report
National Weather Service St Louis MO
637 PM CDT Fri Jul 10 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0610 PM Tstm Wnd Dmg 2 ESE Rocheport 38.97N 92.54W
07/10/2026 Boone MO Emergency Mngr
Tree down on roadway on Hwy BB near I-70.
&&
AselThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 1:23 AM CDT | Areal Flood Advisory | LSX | Monroe | 3 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 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.