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Home Return to list Severe Thunderstorm Warning 0240 Issued by the Chicago Forecast Office
Action: New Issued At: 2026-08-11 09:38:14
181
WUUS53 KLOT 111438
SVRLOT
ILC089-111-111545-
/O.NEW.KLOT.SV.W.0240.260811T1438Z-260811T1545Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville
938 AM CDT Tue Aug 11 2026
The National Weather Service in Chicago has issued a
* Severe Thunderstorm Warning for...
Kane County in northeastern Illinois...
McHenry County in northeastern Illinois...
* Until 1045 AM CDT.
* At 937 AM CDT, severe thunderstorms were located along a line
extending from near Machesney Park to near Cherry Valley to near
Mendota, moving east at 50 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Marengo and Maple Park around 1000 AM CDT.
Huntley, Hampshire, and Lily Lake around 1005 AM CDT.
Elgin, Lake in the Hills, Woodstock, Campton Hills, Sugar Grove,
Pingree Grove, Gilberts, and Elburn around 1010 AM CDT.
Aurora, Crystal Lake, Carpentersville, St. Charles, Algonquin,
Batavia, Geneva, South Elgin, Montgomery, and North Aurora around
1015 AM CDT.
Bartlett, West Chicago, McHenry, Cary, Barrington Hills, Wonder
Lake, East Dundee, Wayne, Valley View, and Prairie Grove around
1020 AM CDT.
Island Lake, Fox River Grove, Oakwood Hills, and Port Barrington
around 1025 AM CDT.
Lakemoor around 1030 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
Prepare immediately for damaging winds and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4240 8820 4216 8820 4215 8824 4207 8824
4207 8826 4172 8826 4172 8860 4215 8859
4215 8871 4241 8870
TIME...MOT...LOC 1437Z 274DEG 43KT 4235 8910 4220 8902 4162 8907
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Izzi
Action: Continued Issued At: 2026-08-11 09:51:14
529
WWUS53 KLOT 111450
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
950 AM CDT Tue Aug 11 2026
ILC089-111-111545-
/O.CON.KLOT.SV.W.0240.000000T0000Z-260811T1545Z/
Kane IL-McHenry IL-
950 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR KANE AND MCHENRY COUNTIES...
At 950 AM CDT, severe thunderstorms were located along a line
extending from near Belvidere to near Malta to near Shabbona, moving
east at 55 mph. This line of storms has a history of producing wind
damage.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Marengo, Hampshire, Maple Park, Huntley, Sugar Grove, Elburn, Lily
Lake, Aurora, Elgin, St. Charles, Algonquin, Lake in the Hills,
Campton Hills, Montgomery, North Aurora, Pingree Grove, Gilberts,
Carpentersville, Batavia, Geneva, South Elgin, West Dundee, Sleepy
Hollow, Wayne, Valley View, Bartlett, West Chicago, Barrington
Hills and East Dundee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
Prepare immediately for damaging winds and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4240 8820 4216 8820 4215 8824 4207 8824
4207 8826 4172 8826 4172 8860 4215 8859
4215 8871 4241 8870
TIME...MOT...LOC 1450Z 286DEG 47KT 4223 8882 4200 8883 4171 8884
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Birk
Action: Continued Issued At: 2026-08-11 10:02:44
877
WWUS53 KLOT 111502
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
1002 AM CDT Tue Aug 11 2026
ILC089-111-111545-
/O.CON.KLOT.SV.W.0240.000000T0000Z-260811T1545Z/
Kane IL-McHenry IL-
1002 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR KANE AND MCHENRY COUNTIES...
At 1002 AM CDT, severe thunderstorms were located along a line
extending from near Genoa to near Maple Park to near Sandwich,
moving east at 55 mph. This line of storms has a history of
producing wind damage.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Aurora, Elgin, Bartlett, Crystal Lake, Carpentersville, St. Charles,
Algonquin, Lake in the Hills, West Chicago, McHenry, Batavia,
Woodstock, Huntley, Geneva, Campton Hills, Harvard, Island Lake,
Marengo, South Elgin, Montgomery, Cary, North Aurora, Sugar Grove,
Pingree Grove, and Gilberts.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
Prepare immediately for damaging winds and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4240 8820 4216 8820 4215 8824 4207 8824
4207 8826 4172 8826 4172 8860 4215 8859
4215 8871 4241 8870
TIME...MOT...LOC 1502Z 287DEG 48KT 4211 8865 4191 8863 4169 8866
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Birk
Action: Continued Issued At: 2026-08-11 10:28:45
636
WWUS53 KLOT 111528
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
1028 AM CDT Tue Aug 11 2026
ILC089-111-111545-
/O.CON.KLOT.SV.W.0240.000000T0000Z-260811T1545Z/
Kane IL-McHenry IL-
1028 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR KANE AND SOUTHEASTERN MCHENRY COUNTIES...
At 1027 AM CDT, severe thunderstorms were located along a line
extending from Wayne to near Aurora to Plainfield, moving east at 55
mph. This line of storms has a history of producing extensive wind
damage.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Aurora, Elgin, Bartlett, Crystal Lake, Carpentersville, St. Charles,
Algonquin, Lake in the Hills, West Chicago, Batavia, Huntley, Geneva,
Campton Hills, South Elgin, Montgomery, Cary, North Aurora, Sugar
Grove, Pingree Grove, Gilberts, West Dundee, Hampshire, Elburn, Fox
River Grove, and Barrington Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
Prepare immediately for damaging winds and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4216 8820 4215 8824 4207 8824 4207 8826
4172 8826 4172 8860 4202 8849 4215 8849
4220 8842 4221 8820
TIME...MOT...LOC 1527Z 290DEG 49KT 4196 8827 4173 8823 4160 8823
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Birk
Action: Expired Issued At: 2026-08-11 10:43:30
956
WWUS53 KLOT 111543
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
1043 AM CDT Tue Aug 11 2026
ILC089-111-111552-
/O.EXP.KLOT.SV.W.0240.000000T0000Z-260811T1545Z/
Kane IL-McHenry IL-
1043 AM CDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR KANE AND SOUTHEASTERN MCHENRY
COUNTIES WILL EXPIRE AT 1045 AM CDT...
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.
A Severe Thunderstorm Watch remains in effect until 200 PM CDT for
northeastern Illinois.
&&
LAT...LON 4216 8820 4215 8824 4207 8824 4207 8826
4172 8826 4172 8860 4202 8849 4215 8849
4220 8842 4221 8820
TIME...MOT...LOC 1542Z 274DEG 43KT 4195 8803 4172 8799 4159 8799
$$
Birk
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