Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 182013
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
313 PM CDT Fri Jul 18 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
313 PM CDT Fri Jul 18 2025 /413 PM EDT Fri Jul 18 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

Limited Thunderstorm Risk Late Tonight.

DISCUSSION...

A line of decaying thunderstorms may bring gusty winds to
northern Illinois west of the Chicago metro toward sunrise
Saturday morning.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Severe Thunderstorm Risk.
Elevated Flooding Risk.
Sunday...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk south of I-80.
Elevated Flooding Risk south of Dixon to Watseka line.
Monday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Tuesday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Wednesday and Thursday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.

DISCUSSION...

Several rounds of thunderstorms may occur through early next
week with strong to severe thunderstorms possible along with
torrential rain and localized flash flooding. The greatest
chances will remain south of I-80.

Dangerous heat and humidity is possible the middle of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

Moving toward the southeast at 30 mph.


https://wxn.io/32y01

Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 180900
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
400 AM CDT Fri Jul 18 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
400 AM CDT Fri Jul 18 2025 /500 AM EDT Fri Jul 18 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

Limited Thunderstorm Risk late tonight.

DISCUSSION...

A line of decaying thunderstorms may bring gusty winds to northern
Illinois west of the Chicago metro toward sunrise Saturday.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
Elevated Flooding Risk.
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Severe Thunderstorm Risk.
Sunday through Monday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Tuesday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Wednesday and Thursday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.

DISCUSSION...

Several rounds of thunderstorms may occur through early next
week with strong to severe thunderstorms possible along with
torrential rain and localized flash flooding. The greatest chances
will remain south of I-80.

Dangerous heat and humidity is possible the middle of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at 30 mph.


https://wxn.io/45unl

Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 172021
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
321 PM CDT Thu Jul 17 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
321 PM CDT Thu Jul 17 2025 /421 PM EDT Thu Jul 17 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

High Swim Risk Lake Michigan Beaches.

DISCUSSION...

High waves and dangerous swimming conditions will continue at
Lake Michigan beaches through Friday morning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday Morning...
High Swim Risk Lake Michigan Beaches.
Friday Night...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Saturday...
Elevated Flooding Risk.
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Severe Thunderstorm Risk.
Sunday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Monday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Tuesday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Wednesday...
Elevated Excessive Heat Risk.

DISCUSSION...

Several rounds of thunderstorms may occur through early next
week with strong to severe thunderstorms possible along with
torrential rain and localized flash flooding.

Dangerous heat and humidity is possible the middle of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.


https://wxn.io/zg575

Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 171637 AAA
HWOLOT

Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
1137 AM CDT Thu Jul 17 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
1137 AM CDT Thu Jul 17 2025 /1237 PM EDT Thu Jul 17 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

High Swim Risk Lake Michigan Beaches.

DISCUSSION...

High waves and life threatening currents are expected at
unprotected Lake Michigan beaches.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday morning...
High Swim Risk Lake Michigan Beaches.
Friday night...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Saturday...
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Elevated Flooding Risk.
Sunday and Monday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Tuesday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
Wednesday...
Elevated Excessive Heat Risk.

DISCUSSION...

High waves will cause dangerous swimming conditions at Lake
Michigan beaches early Friday morning.

There will be periodic bouts of showers and thunderstorms Friday
night through Tuesday. Any storms during this period may be strong
to severe capable of producing damaging winds and torrential
rainfall which could lead to flash flooding.

Dangerous heat and humidity is possible the middle of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.


https://wxn.io/z95xz

Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 170939
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
439 AM CDT Thu Jul 17 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
439 AM CDT Thu Jul 17 2025 /539 AM EDT Thu Jul 17 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

High Swim Risk Lake Michigan Beaches.

DISCUSSION...

High waves and life threatening currents are expected at
unprotected Lake Michigan beaches.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday morning...
High Swim Risk Lake Michigan Beaches.
Friday night...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Saturday...
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Elevated Flooding Risk.
Sunday and Monday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Tuesday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
Wednesday...
Elevated Excessive Heat Risk.

DISCUSSION...

High waves will cause dangerous swimming conditions at Lake
Michigan beaches early Friday morning.

There will be periodic bouts of showers and thunderstorms
Friday night through Tuesday. Any storms during this period may
be strong to severe capable of producing damaging winds and
torrential rainfall which could lead to flash flooding.

Dangerous heat and humidity is possible the middle of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.


https://wxn.io/zotw3

Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 162235
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
535 PM CDT Wed Jul 16 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
535 PM CDT Wed Jul 16 2025 /635 PM EDT Wed Jul 16 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
High Swim Risk Lake Michigan Beaches.
Friday Night...
Limited Thunderstorm Risk.
Saturday...
Elevated Thunderstorm Risk.
Elevated Flooding Risk.
Sunday and Monday...
Limited Thunderstorm Risk.
Tuesday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.

DISCUSSION...

High waves will cause dangerous swimming conditions at Lake
Michigan beaches Thursday through early Friday morning.

There will be periodic bouts of showers and thunderstorms
Friday night through Tuesday. Any storms during this period may
be strong to severe with damaging winds and flash flooding.

Dangerous heat and humidity may arrive midweek next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed anymore.


https://wxn.io/n4v6b

Severe Thunderstorm Watch Cancellation for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS63 KLOT 162105
WCNLOT

WATCH COUNTY NOTIFICATION FOR WATCH 518
NATIONAL WEATHER SERVICE CHICAGO IL
405 PM CDT WED JUL 16 2025


/O.CAN.KLOT.SV.A.0518.000000T0000Z-250717T0100Z/

THE NATIONAL WEATHER SERVICE HAS CANCELLED SEVERE THUNDERSTORM
WATCH 518 FOR THE FOLLOWING AREAS

IN ILLINOIS THIS CANCELS 9 COUNTIES

IN NORTH CENTRAL ILLINOIS

BOONE DE KALB LA SALLE

IN NORTHEAST ILLINOIS

DUPAGE GRUNDY KANE
KENDALL LAKE IL MCHENRY

THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE,
BUFFALO GROVE, CAROL STREAM, COAL CITY, CRYSTAL LAKE, DEKALB,
DOWNERS GROVE, ELGIN, GURNEE, LA SALLE, LOMBARD, MARSEILLES,
MCHENRY, MENDOTA, MINOOKA, MORRIS, MUNDELEIN, NAPERVILLE, OSWEGO,
OTTAWA, PLANO, STREATOR, SYCAMORE, WAUKEGAN, WHEATON, WOODSTOCK,
AND YORKVILLE.


https://wxn.io/md47j