Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 242027
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
327 PM CDT Thu Jul 24 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-
327 PM CDT Thu Jul 24 2025 /427 PM EDT Thu Jul 24 2025/

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

.DAY ONE...Tonight.

Weather hazards expected...

Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Damaging Wind Risk...up to 70 mph.
Elevated Flooding Risk.
Elevated Excessive Heat Risk south of I-80.

DISCUSSION...

Hot and humid conditions are expected this afternoon with peak
heat indices of 100 to 110 degrees lingering south of I-80 ahead
of thunderstorms. Once storms pass, the heat threat will end.

Strong to severe thunderstorms will occur this afternoon into
the early evening, mainly near and south of I-80, including
northwest Indiana. The primary severe risk will be locally
damaging winds to 70 mph. Torrential rainfall may lead to isolated
instances of flooding.

Additional storms are possible this evening, and particularly late
tonight into Friday morning. Locally heavy rainfall may once again
lead to a threat for isolated flash flooding.

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

Friday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Saturday...
Limited Flooding Risk.
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Sunday...
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Monday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.

DISCUSSION...

Periodic thunderstorms Friday through Saturday will bring the
chance for torrential rainfall and loca...

https://wxn.io/oif7o

Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 241702
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1202 PM CDT Thu Jul 24 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-
1202 PM CDT Thu Jul 24 2025 /102 PM EDT Thu Jul 24 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...

Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Damaging Wind Risk...up to 65 mph.
Elevated Flooding Risk.
Elevated Excessive Heat Risk this afternoon.

DISCUSSION...

Hot and humid conditions are expected this afternoon with peak
heat indices of 100 to 110 degrees. The heat and humidity could
help fuel strong to severe thunderstorms this afternoon into this
evening, mainly southeast of a Waukegan to Peru line, including
northwest Indiana. The primary severe risk will be locally
damaging winds to 65 mph.

In addition, storms through tonight will be capable of producing
torrential rainfall which could result in localized flash
flooding.

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

Friday...
Limited Thunderstorm Risk.
Limited Flooding Risk.
Saturday...
Elevated Flooding Risk.
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Sunday...
Limited Excessive Heat Risk.
Monday...
Elevated Excessive Heat Risk.
Tuesday...
Limited Excessive Heat Risk.

DISCUSSION...

Periodic thunderstorms Friday through Saturday will bring the
chance for torrential rainfall and localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

Moving toward the ...

https://wxn.io/bz4br

Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 240911
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
411 AM CDT Thu Jul 24 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-
411 AM CDT Thu Jul 24 2025 /511 AM EDT Thu Jul 24 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...

Elevated Excessive Heat Risk.
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Damaging Wind Risk...up to 60 mph.
Elevated Flooding Risk.

DISCUSSION...

Dangerous heat and humidity will continue across much of
northeastern IL and northwestern IN today, with peak afternoon
heat indices near 105 degrees.

Thunderstorms will redevelop across northern Illinois this
afternoon, then gradually sag south into this evening. The
strongest storms will be capable of producing locally damaging
wind gusts and torrential rainfall that could result in localized
flash flooding.

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

Friday...
Limited Thunderstorm Risk.
Limited Flooding Risk.
Saturday...
Elevated Flooding Risk.
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Sunday...
Limited Excessive Heat Risk.
Monday...
Elevated Excessive Heat Risk.
Tuesday...
Limited Excessive Heat Risk.

DISCUSSION...

Periodic thunderstorms Friday through Saturday will bring the
chance for torrential rainfall and localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at 30 mph


https://wxn.io/davod

Heat Advisory Expiration for McHenry Co., IL

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

WWUS73 KLOT 240304
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
1004 PM CDT Wed Jul 23 2025


/O.EXP.KLOT.HT.Y.0002.000000T0000Z-250724T0300Z/
Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-
Including the cities of DeKalb, Algonquin, Rockford, Belvidere,
Rochelle, Oregon, Dixon, Crystal Lake, Woodstock, McHenry,
Sycamore, and Byron
1004 PM CDT Wed Jul 23 2025

...HEAT ADVISORY HAS EXPIRED...

Warm and humid conditions will continue overnight through Thursday
but are expected to remain below advisory criteria. Accordingly, the
Heat Advisory has been allowed to expire.


https://wxn.io/d2ya3

Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 240102 AAA
HWOLOT

Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
802 PM CDT Wed Jul 23 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-
802 PM CDT Wed Jul 23 2025 /902 PM EDT Wed Jul 23 2025/

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

.DAY ONE...Tonight.

Weather hazards expected...

Elevated Excessive Heat Risk.

DISCUSSION...

Heat indices will remain above 75 degrees through the night for
much of the area, with heat indices only falling to around 85
degrees very late tonight in Chicago.

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

Thursday...
Significant Excessive Heat Risk.
Elevated Flooding Risk.
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Friday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Saturday...
Limited Thunderstorm Risk.
Limited Flooding Risk.
Sunday through Tuesday...
Limited Excessive Heat Risk.

DISCUSSION...

Peak afternoon heat index values of 100 to 110 degrees are
expected again Thursday afternoon.

Thunderstorms may arrive as early as Thursday morning across
northwest Illinois, with increasing chances during the afternoon
and evening across the area. Any thunderstorms that occur will be
capable of gusty to locally damaging wind gusts as well as
torrential rainfall leading to localized flash flooding.

Periodic thunderstorms Friday through Saturday will bring the
chance for torrential rainfall and localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.


https://wxn.io/bq4rj

Heat Advisory for McHenry Co., IL until 10:00 PM CDT 7/23

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

WWUS73 KLOT 232035
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
335 PM CDT Wed Jul 23 2025


/O.CON.KLOT.HT.Y.0002.000000T0000Z-250724T0300Z/
Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-
Including the cities of McHenry, Dixon, Oregon, Rockford, DeKalb,
Belvidere, Byron, Algonquin, Crystal Lake, Woodstock, Sycamore,
and Rochelle
335 PM CDT Wed Jul 23 2025

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 PM CDT THIS EVENING...

* WHAT...Heat index values of 105 to 110 occurring.

* WHERE...Boone, De Kalb, Lee, Ogle, Winnebago, and McHenry Counties.

* WHEN...Until 10 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

&&


https://wxn.io/gi37h

Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 232027
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
327 PM CDT Wed Jul 23 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-
327 PM CDT Wed Jul 23 2025 /427 PM EDT Wed Jul 23 2025/

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

.DAY ONE...Tonight.

Weather hazards expected...

Significant Excessive Heat Risk through early evening.
Limited Thunderstorm Risk.

DISCUSSION...

A few isolated thunderstorms are expected this afternoon.

Heat index values will remain as high as 110 degrees
through the early part of this evening.

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

Thursday...
Elevated Flooding Risk.
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Significant Excessive Heat Risk.
Friday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Saturday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Sunday through Tuesday...
Limited Excessive Heat Risk.

DISCUSSION...

Peak afternoon heat index values of 100 to 110 degrees are
expected again Thursday afternoon.

The chance of thunderstorms will increase late Thursday afternoon
near the Wisconsin border, with thunderstorm chances gradually
spreading south across the remainder of northern Illinois
Thursday evening. Any thunderstorms that do occur will be capable
of producing torrential rainfall and localized flash flooding
with a slight chance of locally damaging winds.

Periodic thunderstorms Friday through Saturday will bring the
chance for torrential rainfall and localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonig...

https://wxn.io/rogg5