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Home Return to list Severe Thunderstorm Warning 0250 Issued by the Chicago Forecast Office
Action: New Issued At: 2026-08-12 08:23:42 129 WUUS53 KLOT 121323 SVRLOT ILC099-121445- /O.NEW.KLOT.SV.W.0250.260812T1323Z-260812T1445Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Chicago/Romeoville 823 AM CDT Wed Aug 12 2026 The National Weather Service in Chicago has issued a * Severe Thunderstorm Warning for... La Salle County in north central Illinois... * Until 945 AM CDT. * At 822 AM CDT, a line of severe thunderstorms was located from Ogio to Princeton to Lone Tree Corners, moving east at around 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Ottawa, Streator, Peru, La Salle, Mendota, Marseilles, Sheridan, Lake Holiday, Oglesby, Seneca, Somonauk, Earlville, North Utica, Serena, Leland, Tonica, Grand Ridge, Naplate, Millington, Dayton, Lostant, Ransom, Cedar Point, Kangley, and Troy Grove. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4163 8917 4163 8860 4111 8859 4110 8916 TIME...MOT...LOC 1322Z 267DEG 36KT 4157 8942 4151 8935 4141 8933 4128 8937 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Borchardt Action: Continued Issued At: 2026-08-12 08:33:43
402
WWUS53 KLOT 121333
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
833 AM CDT Wed Aug 12 2026
ILC099-121445-
/O.CON.KLOT.SV.W.0250.000000T0000Z-260812T1445Z/
La Salle IL-
833 AM CDT Wed Aug 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR LA SALLE COUNTY...
At 833 AM CDT, severe thunderstorms were located along a line
extending from near Woodhaven Lakes to near La Moille to Spring
Valley to near Henry, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
The most intense winds are likely near and north of I-80.
These severe storms will be near...
Peru, La Salle, Mendota, Oglesby, North Utica, and Tonica around
840 AM CDT.
Ottawa, Earlville, and Naplate around 855 AM CDT.
Grand Ridge around 900 AM CDT.
Streator, Marseilles, Serena, and Leland around 905 AM CDT.
Sheridan around 910 AM CDT.
Lake Holiday and Seneca around 915 AM CDT.
Somonauk around 920 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4163 8917 4163 8860 4111 8859 4110 8916
TIME...MOT...LOC 1333Z 273DEG 34KT 4161 8931 4150 8922 4131 8923 4115
8932
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Izzi
Action: Continued Issued At: 2026-08-12 08:46:43
779
WWUS53 KLOT 121346
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
846 AM CDT Wed Aug 12 2026
ILC099-121445-
/O.CON.KLOT.SV.W.0250.000000T0000Z-260812T1445Z/
La Salle IL-
846 AM CDT Wed Aug 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR LA SALLE COUNTY...
At 845 AM CDT, line of severe thunderstorms extended from Sublette
to Mendota to Troy Grove to LaSalle, and was moving east at 45 mph.
HAZARD...70 mph wind gusts. The strongest wind gusts are expected
near and north of Interstate 80.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe storms will be near...
La Salle, Mendota, Oglesby, North Utica, and Tonica around 850 AM
CDT.
Other locations in the path of these severe thunderstorms include
Ottawa, Earlville, Naplate, Streator, Serena, Leland, Grand Ridge,
Marseilles, Sheridan, Lake Holiday, Seneca and Somonauk.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4163 8917 4163 8860 4111 8859 4110 8916
TIME...MOT...LOC 1345Z 267DEG 36KT 4162 8918 4150 8909 4131 8910 4116
8919
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Borchardt
Action: Continued Issued At: 2026-08-12 08:59:59
096
WWUS53 KLOT 121359
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
859 AM CDT Wed Aug 12 2026
ILC099-121445-
/O.CON.KLOT.SV.W.0250.000000T0000Z-260812T1445Z/
La Salle IL-
859 AM CDT Wed Aug 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR LA SALLE COUNTY...
At 858 AM CDT, line of severe thunderstorms extended from Paw Paw to
Earlville to Harding to Ottawa and Leanore, and was moving east at
45 mph.
HAZARD...70 mph wind gusts. The strongest winds are expected along
and north of Interstate 80.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe storms will be near...
Ottawa, Streator, Marseilles, Sheridan, Serena, Leland, and Grand
Ridge around 905 AM CDT.
Other locations in the path of these severe thunderstorms include
Lake Holiday, Seneca and Somonauk.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4163 8917 4163 8860 4111 8859 4110 8916
TIME...MOT...LOC 1358Z 269DEG 38KT 4162 8896 4150 8887 4131 8888 4116
8897
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Borchardt
Action: Continued Issued At: 2026-08-12 09:12:14
459
WWUS53 KLOT 121411
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
911 AM CDT Wed Aug 12 2026
ILC099-121445-
/O.CON.KLOT.SV.W.0250.000000T0000Z-260812T1445Z/
La Salle IL-
911 AM CDT Wed Aug 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR NORTHEASTERN LA SALLE COUNTY...
At 911 AM CDT, a line of severe thunderstorms extended from Leland
to Sheridan to Grand Ridge, and was moving east at 45 mph.
HAZARD...70 mph wind gusts. The strongest wind gusts are expected
along and north of Interestate 80.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe storms will be near...
Marseilles, Lake Holiday, Seneca, and Somonauk around 915 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4163 8904 4163 8860 4119 8859 4123 8891
4138 8892
TIME...MOT...LOC 1411Z 264DEG 38KT 4166 8877 4154 8868 4135 8869 4120
8878
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Borchardt
Action: Cancelled Issued At: 2026-08-12 09:29:44
977
WWUS53 KLOT 121429
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
929 AM CDT Wed Aug 12 2026
ILC099-121439-
/O.CAN.KLOT.SV.W.0250.000000T0000Z-260812T1445Z/
La Salle IL-
929 AM CDT Wed Aug 12 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LA SALLE COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 PM CDT for
north central and northeastern Illinois.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Chicago.
&&
LAT...LON 4163 8904 4163 8860 4119 8859 4123 8891
4138 8892
TIME...MOT...LOC 1426Z 267DEG 36KT 4167 8857 4155 8848 4136 8849 4121
8858
$$
Borchardt
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