Beach Hazards Statement 7, NWS Chicago, IL

992 
WHUS43 KLOT 300249
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
949 PM CDT Tue Jul 29 2025

ILZ006-103-104-INZ001-002-301200-
/O.CON.KLOT.BH.S.0007.250730T1800Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
949 PM CDT Tue Jul 29 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM WEDNESDAY
AFTERNOON THROUGH FRIDAY AFTERNOON...

* WHAT...High wave action and dangerous currents expected at 
  Lake Michigan beaches. Waves 5 to 8 feet expected.

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...From Wednesday afternoon through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

061 
WHUS43 KLOT 300927
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
427 AM CDT Wed Jul 30 2025

ILZ006-103-104-INZ001-002-301730-
/O.CON.KLOT.BH.S.0007.250730T1800Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
427 AM CDT Wed Jul 30 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 1 PM CDT THIS
AFTERNOON THROUGH FRIDAY AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 5 to 9 feet expected.

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...From Wednesday afternoon through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

448 
WHUS43 KLOT 301448
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
948 AM CDT Wed Jul 30 2025

ILZ006-103-104-INZ001-002-302300-
/O.CON.KLOT.BH.S.0007.250730T1800Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
948 AM CDT Wed Jul 30 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 1 PM CDT THIS
AFTERNOON THROUGH FRIDAY AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches due to waves 4 to 7 ft expected. 

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...From 1 PM CDT this afternoon through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

Borchardt

791 
WHUS43 KLOT 301944
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
244 PM CDT Wed Jul 30 2025

ILZ006-103-104-INZ001-002-310345-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
244 PM CDT Wed Jul 30 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches expected. Waves 5 to 8 ft expected. 

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

273 
WHUS43 KLOT 310342
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
1042 PM CDT Wed Jul 30 2025

ILZ006-103-104-INZ001-002-311145-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
1042 PM CDT Wed Jul 30 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 4 to 7 ft expected.

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

485 
WHUS43 KLOT 310909
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
409 AM CDT Thu Jul 31 2025

ILZ006-103-104-INZ001-002-311715-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
409 AM CDT Thu Jul 31 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 4 to 8 ft expected.

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

079 
WHUS43 KLOT 311332
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
832 AM CDT Thu Jul 31 2025

ILZ006-103-104-INZ001-002-312145-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
832 AM CDT Thu Jul 31 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents at Lake Michigan
  beaches occurring. 

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

072 
WHUS43 KLOT 311940
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
240 PM CDT Thu Jul 31 2025

ILZ006-103-104-INZ001-002-010345-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
240 PM CDT Thu Jul 31 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents at Lake Michigan
  beaches occurring. 

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

789 
WHUS43 KLOT 010218
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
918 PM CDT Thu Jul 31 2025

ILZ006-103-104-INZ001-002-011030-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
918 PM CDT Thu Jul 31 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH FRIDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents occurring at Lake
  Michigan beaches. 

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Friday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

296 
WHUS43 KLOT 010851
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
351 AM CDT Fri Aug 1 2025

ILZ006-103-104-INZ001-002-012100-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
351 AM CDT Fri Aug 1 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THIS
AFTERNOON...

* WHAT...High wave action and dangerous currents occurring at Lake
  Michigan beaches.

* WHERE...In Illinois, Lake, Northern Cook and Central Cook 
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through this afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

403 
WHUS43 KLOT 011354
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
854 AM CDT Fri Aug 1 2025

ILZ006-011500-
/O.CAN.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Lake IL-
854 AM CDT Fri Aug 1 2025

...BEACH HAZARDS STATEMENT IS CANCELLED...

Buoy observations, webcams, and beach reports indicate that wave
heights are generally between 1 to locally 4 feet. With the
expectation for waves to continue slowly subsiding today, the
Beach Hazards Statement will be cancelled early. 

$$

ILZ103-104-INZ001-002-012100-
/O.CON.KLOT.BH.S.0007.000000T0000Z-250801T2100Z/
Northern Cook-Central Cook-Lake IN-Porter-
854 AM CDT Fri Aug 1 2025

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 4 PM CDT THIS
AFTERNOON...

* WHAT...High wave action and dangerous currents at Lake Michigan
  beaches occurring. 

* WHERE...In Illinois, Northern Cook and Central Cook Counties. 
  In Indiana, Lake and Porter Counties.

* WHEN...Until 4 PM CDT this afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers. For information on swim 
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

Borchardt

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
251 PM CDT Tue Jul 29 2025

.KEY MESSAGES...

- Periods of thunderstorms through Thursday morning, some
  possibly strong to severe with torrential rain which could
  lead to localized flash flooding.

- Possible period of prolonged heavy rain Wednesday night into
  early Thursday morning.

- Dangerous swimming conditions at Lake Michigan beaches
  Wednesday afternoon through Friday.

&&

.DISCUSSION...
Issued at 252 PM CDT Tue Jul 29 2025

Through Tonight:

It has been another hot and humid day under mostly sunny skies,
though dew points have trended slightly lower then yesterday. Heat
index values currently in the upper 90s for most locations will top
out around 100, with some readings in the 100-105 range across the
western CWA amid higher low-level moisture.

Cumulus had struggled to develop until the past hour or so due to
modest warming/capping in the 6-8kft layer. Mixing heights have
started to rise into that layer, though satellite imagery and visual
appearance of stunted cumulus suggest capping is still holding as of
3pm. A weak front/boundary drifting southward over southern
Wisconsin as well as a lake breeze oozing inland from the Illinois
shore will begin to interact with a more pronounced cumulus field
over the northern Chicago metro during the next few hours. Have
maintained slight chance PoPs/thunder in this area into early evening
in the event the cap does break. If this were to occur, modest deep-
layer shear for late July would be sufficient for an organized
discrete cell or two with locally strong winds and torrential
rainfall.

Dry conditions are expected this evening, and possibly well into the
night, as winds synoptically veer north or northeasterly while high
pressure builds over the far northern Great Lakes. Phasing of a pair
of waves that will be convectively enhanced by substantial
convection over Nebraska and Iowa tonight will shift eastward across
Iowa through sunrise Wednesday. A resulting low-level contraction of
the baroclinic zone along the southern extent of the high will
settle somewhere over the forecast area late tonight. Cannot rule
out isolated convection along this boundary across the western CWA
very late tonight, though weak low-level flow nearly parallel to the
front will likely provide insufficient forcing to overcome existing
MUCIN remaining over northern Illinois overnight.

Kluber

Wednesday through Tuesday:

Primary forecast concern remains severe thunderstorm and heavy
rain potential through Thursday morning with several rounds of
thunderstorms.

Thunderstorms may be ongoing Wednesday morning across the
western cwa, possibly as a slowly weakening line. Its also
possible that while the line may weaken during the mid morning,
that it maintains enough organization to reintensify as it
moves across the Chicago metro area midday. Some of these storms
could possibly become strong/severe along with heavy
rain/localized flooding.

The cold front will be moving south across the area Wednesday
and the morning/midday storms may aid the front pushing into
the southern cwa into the afternoon. Additional thunderstorms
are expected to develop Wednesday afternoon. Depending on where
the front ends up when storms develop, there is the potential
for supercell thunderstorms across the southern third or so of
the cwa Wednesday afternoon, which would then allow for all
modes of severe weather. Despite the northeast winds further
north, if any organized thunderstorms can develop/persist, there
would remain at least an isolated damaging wind potential
further north.

There is now a consensus for additional rain, most likely heavy
rain Wednesday night into Thursday morning across much of the
area, particularly along/north of I-80. A slow moving secondary
low is expected to move across the area allowing for a prolonged
period of rain. Precipitable water values during this time are
in the 2 to 2.25 inch range with several models showing QPF
amounts anywhere from 2 to 4 inches, much of this falling in 6
to 12 hours. Consideration was given to a flood watch for this
time period but it is still 30-36 hours out and there remains
quite a bit of uncertainty. Have increase QPF during this period
but it may not be enough if the current trends materialize.
While scattered thunderstorms would remain possible Wednesday
night, the heavy rain and possible flooding remains the main
threat during this time period.

Northeasterly winds steadily increase Wednesday afternoon and
may be gusting into the 30-35 mph range Wednesday night. Did
increase speeds/gusts, but they may need to be increased further
with later forecasts. These northeast winds will allow for high
waves and dangerous swimming conditions at Lake Michigan beaches
through Friday.

Much less humid conditions are expected through Sunday and then
humidity levels begin to increase again early next week. Highs
in the 70s are expected Thursday/Friday and then highs will
likely reach 80 Saturday and then back into the 80s Sunday into
early next week. cms

&&

.AVIATION /18Z TAFS THROUGH 00Z THURSDAY/...
Issued at 106 PM CDT Tue Jul 29 2025

A lake breeze remains pinned along the Lake Michigan shore this
afternoon, but should begin a westward drift through the
remainder of the afternoon. The boundary is not expected to
reach ORD/MDW before sunset, but will provide a focus for a very
low (10%) chance of TS to develop roughly in the 20-00Z window.
A weak boundary drifting south from southern Wisconsin would
provide additional support, so any TS (again, very low chance)
would likely occur near the WI/IL line and track SSE along the
lake breeze toward Chicago.

Conditions should remain dry tonight as W/NW winds up to 10
knots veer NE while diminishing late this evening and overnight.

A very complex weather setup is in store for Wednesday, with
multiple rounds of TS possible throughout the day. Overall
thinking with the latest TAF is that a robust line of convection
developing over the central Great Plains this evening will
track toward the north half of Illinois Wednesday morning. This
line may move across the Chicago terminals early enough and in a
decaying phase to limit TS coverage and intensity mid to late
morning. However, any slower arrival time would allow to re-
intensification of the line of TS as daytime heating increases,
supporting the potential for strong to severe convection over
the Chicago terminals early in the afternoon.

A cold front will then shift southward across the Chicago area
early to mid afternoon with SHRA, MVFR ceilings and NE winds
gusting over 20 knots. If the first round of TS does not
materialize, stronger TS can be expected near the front over or
just south of the Chicago terminals mid to late afternoon. But
if the first round of convection remains strong across the
terminals, an combined front and outflow would push the highest
TS potential well south of the terminals, with TS coverage
mostly confined to embedded elevated cells within a broader area
of SHRA.

Kluber

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement from Wednesday afternoon through
     Friday afternoon for ILZ006-ILZ103-ILZ104.

IN...Beach Hazards Statement from Wednesday afternoon through
     Friday afternoon for INZ001-INZ002.

LM...Small Craft Advisory from 1 PM Wednesday to 9 AM CDT Friday
     for the IL and IN nearshore waters.

&&

Visit us at weather.gov/chicago

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
256 PM CDT Tue Jul 29 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-302000-
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-
256 PM CDT Tue Jul 29 2025 /356 PM EDT Tue Jul 29 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...with an associated:
     Level 1 of 5 Damaging Wind Risk...up to 60 mph.

DISCUSSION...

An isolated thunderstorm cannot be ruled out along the Illinois
lakeshore late this afternoon.

Thunderstorms with gusty winds may approach north central
Illinois as early as sunrise Wednesday, though likely will remain
west of the area until the daytime hours Wednesday.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Elevated Flooding Risk.
  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.
Thursday...
  Limited Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.
Friday...
  High Swim Risk Lake Michigan Beaches.
Monday...
  Limited Thunderstorm Risk.

DISCUSSION...

Periods of thunderstorms are likely Wednesday through Thursday
morning. Some of these storms Wednesday could be strong to severe
and also produce torrential rain which may lead to localized
flash flooding. Periods of heavy rain are possible Wednesday night.

High waves and dangerous swimming conditions are expected
Wednesday afternoon through Friday afternoon at Lake Michigan
beaches.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

GENERAL STORM MOTION OF THE DAY:

Moving toward the south-southeast at 20 mph this afternoon.
Moving toward the east-southeast at 30 to 40 mph toward sunrise.

LMZ740>745-302000-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
256 PM CDT Tue Jul 29 2025

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk Toward Sunrise Wednesday.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Hazardous conditions for small craft are likely.
  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Thursday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk.
Friday...
  Hazardous conditions for small craft are likely.
Monday...
  Limited Thunderstorm Risk.

Visit us at www.weather.gov/chicago

Preliminary Local Storm Report
National Weather Service Chicago IL
126 PM CDT Tue Jul 29 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0200 PM     Tstm Wnd Dmg     1 SE Lynwood            41.52N 87.53W
07/28/2025                   Cook               IL   Public

            Corrects previous non-tstm wnd dmg report
            from 1 N Lynwood. Fences blown down and some
            roof damage reported to homes.

&&

RO