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Home Return to list Severe Thunderstorm Warning 0234 Issued by the Chicago Forecast Office
Action: New Issued At: 2026-08-11 03:11:16
652
WUUS53 KLOT 110811
SVRLOT
ILC007-111-110915-
/O.NEW.KLOT.SV.W.0234.260811T0811Z-260811T0915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville
311 AM CDT Tue Aug 11 2026
The National Weather Service in Chicago has issued a
* Severe Thunderstorm Warning for...
Northwestern McHenry County in northeastern Illinois...
Northern Boone County in north central Illinois...
* Until 415 AM CDT.
* At 310 AM CDT, a severe thunderstorm was located near Clinton, or
10 miles east of Beloit, moving southeast at 25 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...
Woodstock, Harvard, Poplar Grove, Candlewick Lake, Wonder Lake,
Sharon, Capron, Hebron, Garden Prairie, Chemung, and Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4250 8841 4238 8834 4223 8871 4242 8894
4250 8894
TIME...MOT...LOC 0810Z 314DEG 22KT 4252 8882
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Yack
Action: Continued Issued At: 2026-08-11 03:23:17
025
WWUS53 KLOT 110823
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
323 AM CDT Tue Aug 11 2026
ILC007-111-110915-
/O.CON.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
McHenry IL-Boone IL-
323 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR NORTHWESTERN MCHENRY AND NORTHERN BOONE COUNTIES...
At 322 AM CDT, a severe thunderstorm was located over Sharon, or near
Harvard, moving southeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Woodstock, Harvard, Poplar Grove, Candlewick Lake, Wonder Lake,
Sharon, Capron, Hebron, Garden Prairie, Chemung, and Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4250 8843 4238 8834 4223 8871 4242 8894
4250 8894
TIME...MOT...LOC 0822Z 314DEG 23KT 4246 8874
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Yack
Action: Continued Issued At: 2026-08-11 03:35:33
409
WWUS53 KLOT 110835
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
335 AM CDT Tue Aug 11 2026
ILC007-111-110915-
/O.CON.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
McHenry IL-Boone IL-
335 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR NORTHWESTERN MCHENRY AND NORTHERN BOONE COUNTIES...
At 335 AM CDT, a severe thunderstorm was located near Harvard, moving
southeast at 35 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...
Woodstock, Harvard, Poplar Grove, Wonder Lake, Sharon, Capron,
Hebron, Garden Prairie, Chemung, and Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4250 8843 4238 8834 4223 8871 4241 8890
4250 8875
TIME...MOT...LOC 0835Z 313DEG 29KT 4237 8862
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Yack
Action: Continued Issued At: 2026-08-11 03:45:03
678
WWUS53 KLOT 110844
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
344 AM CDT Tue Aug 11 2026
ILC007-110854-
/O.CAN.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
Boone IL-
344 AM CDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BOONE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
&&
LAT...LON 4238 8834 4223 8870 4243 8871 4250 8846
4250 8843
TIME...MOT...LOC 0844Z 317DEG 24KT 4235 8855
$$
ILC111-110915-
/O.CON.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
McHenry IL-
344 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR NORTHWESTERN MCHENRY COUNTY...
At 344 AM CDT, a severe thunderstorm was located near Harvard, moving
southeast at 30 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Woodstock, Harvard, Wonder Lake, Hebron, Chemung, and Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4238 8834 4223 8870 4243 8871 4250 8846
4250 8843
TIME...MOT...LOC 0844Z 317DEG 24KT 4235 8855
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Yack
Action: Cancelled Issued At: 2026-08-11 03:45:03
678
WWUS53 KLOT 110844
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
344 AM CDT Tue Aug 11 2026
ILC007-110854-
/O.CAN.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
Boone IL-
344 AM CDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BOONE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
&&
LAT...LON 4238 8834 4223 8870 4243 8871 4250 8846
4250 8843
TIME...MOT...LOC 0844Z 317DEG 24KT 4235 8855
$$
ILC111-110915-
/O.CON.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
McHenry IL-
344 AM CDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR NORTHWESTERN MCHENRY COUNTY...
At 344 AM CDT, a severe thunderstorm was located near Harvard, moving
southeast at 30 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Woodstock, Harvard, Wonder Lake, Hebron, Chemung, and Greenwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4238 8834 4223 8870 4243 8871 4250 8846
4250 8843
TIME...MOT...LOC 0844Z 317DEG 24KT 4235 8855
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Yack
Action: Cancelled Issued At: 2026-08-11 04:02:34
226
WWUS53 KLOT 110902
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
402 AM CDT Tue Aug 11 2026
ILC111-110911-
/O.CAN.KLOT.SV.W.0234.000000T0000Z-260811T0915Z/
McHenry IL-
402 AM CDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MCHENRY COUNTY IS
CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
Remember, a Severe Thunderstorm Warning still remains in effect for
southeasern McHenry County and southwestern Lake County until 445
AM.
&&
LAT...LON 4238 8834 4223 8870 4243 8871 4250 8846
4250 8843
TIME...MOT...LOC 0900Z 314DEG 22KT 4228 8845
$$
Yack
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