Beach Hazards Statement 9, NWS Chicago, IL

970 
WHUS43 KLOT 060811
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
311 AM CDT Tue Aug 6 2024

ILZ006-061615-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IL-
311 AM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 7 to 10 ft expected.

* WHERE...Lake County IL.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ103-104-061615-
/O.CON.KLOT.BH.S.0009.240806T1500Z-240807T2000Z/
Northern Cook-Central Cook-
311 AM CDT Tue Aug 6 2024

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 10 AM CDT THIS
MORNING THROUGH WEDNESDAY AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Northern Cook and Central Cook Counties.

* WHEN...From 10 AM CDT this morning through Wednesday 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.

&&

$$

INZ001-002-061615-
/O.CON.KLOT.BH.S.0009.240806T1800Z-240807T2000Z/
Lake IN-Porter-
311 AM CDT Tue Aug 6 2024

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

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

* WHERE...Lake IN and Porter Counties.

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

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

862 
WHUS43 KLOT 061427
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
927 AM CDT Tue Aug 6 2024

ILZ103-104-062230-
/O.EXT.KLOT.BH.S.0009.240806T1427Z-240807T2000Z/
Northern Cook-Central Cook-
927 AM CDT Tue Aug 6 2024

...BEACH HAZARDS STATEMENT NOW IN EFFECT THROUGH WEDNESDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 7 to 10 ft expected.

* WHERE...Northern Cook and Central Cook Counties.

* WHEN...Through Wednesday 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.

&&

$$

INZ001-002-062230-
/O.EXT.KLOT.BH.S.0009.240806T1500Z-240807T2000Z/
Lake IN-Porter-
927 AM CDT Tue Aug 6 2024

...BEACH HAZARDS STATEMENT NOW IN EFFECT THROUGH WEDNESDAY
AFTERNOON...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Lake IN and Porter Counties.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ006-062230-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IL-
927 AM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 7 to 10 ft expected.

* WHERE...Lake County IL.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

190 
WHUS43 KLOT 061948
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
248 PM CDT Tue Aug 6 2024

ILZ006-070400-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IL-
248 PM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Lake County IL.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ103-104-070400-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Northern Cook-Central Cook-
248 PM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Northern Cook and Central Cook Counties.

* WHEN...Through Wednesday 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.

&&

$$

INZ001-002-070400-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IN-Porter-
248 PM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Lake IN and Porter Counties.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

623 
WHUS43 KLOT 070135
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
835 PM CDT Tue Aug 6 2024

ILZ006-070945-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IL-
835 PM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at 
  Lake Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Lake County IL.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ103-104-070945-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Northern Cook-Central Cook-
835 PM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at 
  Lake Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Northern Cook and Central Cook Counties.

* WHEN...Through Wednesday 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.

&&

$$

INZ001-002-070945-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IN-Porter-
835 PM CDT Tue Aug 6 2024

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

* WHAT...High wave action and dangerous currents expected at 
  Lake Michigan beaches. Waves 6 to 9 ft expected.

* WHERE...Lake IN and Porter Counties.

* WHEN...Through Wednesday afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

560 
WHUS43 KLOT 070756
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
256 AM CDT Wed Aug 7 2024

ILZ006-071600-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IL-
256 AM CDT Wed Aug 7 2024

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

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

* WHERE...Lake County IL.

* WHEN...Through this afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ103-104-071600-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Northern Cook-Central Cook-
256 AM CDT Wed Aug 7 2024

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

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

* WHERE...Northern Cook and Central Cook 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.

&&

$$

INZ001-002-071600-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240807T2000Z/
Lake IN-Porter-
256 AM CDT Wed Aug 7 2024

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

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

* WHERE...Lake IN and Porter Counties.

* WHEN...Through this afternoon.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

787 
WHUS43 KLOT 071416
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
916 AM CDT Wed Aug 7 2024

ILZ006-072230-
/O.EXT.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Lake IL-
916 AM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT NOW IN EFFECT UNTIL 9 PM CDT THIS
EVENING...

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

* WHERE...Lake County IL.

* WHEN...Until 9 PM CDT this evening.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ103-104-072230-
/O.EXT.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Northern Cook-Central Cook-
916 AM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT NOW IN EFFECT UNTIL 9 PM CDT THIS
EVENING...

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

* WHERE...Northern Cook and Central Cook Counties.

* WHEN...Until 9 PM CDT this evening.

* 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.

&&

$$

INZ001-002-072230-
/O.EXT.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Lake IN-Porter-
916 AM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT NOW IN EFFECT UNTIL 9 PM CDT THIS
EVENING...

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

* WHERE...Lake IN and Porter Counties.

* WHEN...Until 9 PM CDT this evening.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

374 
WHUS43 KLOT 071951
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
251 PM CDT Wed Aug 7 2024

ILZ006-080200-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Lake IL-
251 PM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 9 PM CDT THIS
EVENING...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 3 to 5 ft expected.

* WHERE...Lake County IL.

* WHEN...Until 9 PM CDT this evening.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

ILZ103-104-080200-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Northern Cook-Central Cook-
251 PM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 9 PM CDT THIS
EVENING...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 3 to 5 ft expected.

* WHERE...Northern Cook and Central Cook Counties.

* WHEN...Until 9 PM CDT this evening.

* 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.

&&

$$

INZ001-002-080200-
/O.CON.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Lake IN-Porter-
251 PM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 9 PM CDT THIS
EVENING...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 3 to 5 ft expected.

* WHERE...Lake IN and Porter Counties.

* WHEN...Until 9 PM CDT this evening.

* IMPACTS...Swimming conditions will be life threatening, 
  especially for inexperienced swimmers.

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.

&&

$$

085 
WHUS43 KLOT 080204
CFWLOT

Coastal Hazard Message
National Weather Service Chicago IL
904 PM CDT Wed Aug 7 2024

ILZ006-103-104-INZ001-002-080315-
/O.EXP.KLOT.BH.S.0009.000000T0000Z-240808T0200Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
904 PM CDT Wed Aug 7 2024

...BEACH HAZARDS STATEMENT HAS EXPIRED...

Waves will continue to subside tonight so the Beach Hazard
Statement has been allowed to expire. Though 2 to 4 foot waves
will linger through midnight, especially at northwest Indiana 
beaches.


$$

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
259 PM CDT Mon Aug 5 2024

.KEY MESSAGES...

- Conditional threat of severe thunderstorms late this
  afternoon into the evening

- Another round of storms possible early Tuesday morning mainly
  north of I-80, a few showers/storms could then linger across
  eastern IL/northwest IN into the afternoon.

- Sharp temperature gradient across the area on Tuesday, with
  highs in the 70s to near 80 north of I-80 and 80s to near 90
  south of I-80.

- High waves and dangerous swimming conditions at Lake Michigan
  beaches Tuesday through Wednesday.

- Wednesday through Monday will have seasonal temperatures,
  lower humidity levels, light winds, and slim (<10%) chances
  for regional rainfall.

&&

.DISCUSSION...
Issued at 300 PM CDT Mon Aug 5 2024

Through Tuesday:

Surface low pressure is currently centered across southeast
South Dakota. A surface boundary extends east southeast of the
low across northern Iowa and northern Illinois late this
afternoon. With much of the area situated within the warm sector
south of this boundary, hot and humid conditions have developed
with heat indices in the upper 90s to lower 100s. A sharp lake
enhanced cold front is now moving inland across portions of Lake
and Cook Counties in Illinois where temperatures have already
cooled into the 70s. This boundary will continue advance
southwest this afternoon and evening, providing relief from the
heat in its wake.

We are closely monitoring for the potential for thunderstorm
development this afternoon, (currently 20-40% chance). The
atmosphere is highly unstable with MUCAPE of 3500-4000+ J/kg in
place. This suggests that if storms can form they could see
explosive development. The main question remains whether storms
in fact develop. There are two surface boundaries/convergence
axes that could serve as potential sources of lift. One
extending from near Rockford northwest through southwest
Wisconsin. A second weaker convergence axis lies near the
Kankakee River Valley and points west through central LaSalle
County. Effective bulk shear is not especially strong initially,
particularly south of I-88, though areas closer to the WI/IL
stateline will increase to greater than 45 kts by early evening.
This would support the potential for damaging winds and hail
with any storms that develop. A brief tornado also can't be
ruled out mainly north of I-88 and west of the metro where the
lower-level shear becomes slightly more favorable. CAMs suggest
storms will develop in the vicinity of these boundaries west of
the Chicago metro and gradually drift east to east southeast
with time. Suspect that the window for severe storms may be
fairly short with storm intensity expected to decrease with
eastward extent as they move into a cooler, less stable
environment behind the aforementioned lake enhanced boundary.

A decrease in shower/storm coverage is probable toward midnight
before the surface low approaches from the west late tonight.
Expect increasing shower/storm coverage once again, particularly
north of I-80 and toward the Illinois-Wisconsin stateline
overnight. THese storms will be capable of heavy rain and gusty
winds. A localized damaging wind gust also can't be ruled out,
though confidence in storms maintaining intensity through
northern Illinois remains low. If a more southerly track of
storms verifies, training of storms across the same areas in far
northern Illinois could lead to some flooding.

By daybreak Tuesday storms may be ongoing across the Chicago
metro into northwest Indiana. Depending on how quickly they exit
to the southeast in the morning, we may be shower/thunderstorm
free as early as the afternoon. If showers/storms are a bit
slower to exit, renewed destabilization across northwest Indiana
could allow for a couple strong to marginally severe storm to
develop before it exits out of the area by the evening.

A sharp temperature gradient is expected on Tuesday thanks to a
cold front sagging south across the area turning winds
northerly and breezy. Temperatures along and north of I-80 may
struggle to warm out of the 70s while areas south of I-80 could
still warm into the 80s to near 90s (heat indices in the 90s)
prior to the frontal passage.

Petr

Northeast winds may increase into the 20 mph range over southern
Lake Michigan this afternoon into early this evening, allowing
waves to possibly build into the 2-4 ft range, especially for
the IL shore of Lake Michigan. Winds may diminish slightly this
evening but as the main cold front moves south across southern
Lake Michigan Tuesday morning, northerly winds will steadily
increase and likely into the 30-35 mph range over southern Lake
Michigan Tuesday afternoon/evening. These winds will allow waves
to build into the 6-9 ft range and create dangerous swimming
conditions at Lake Michigan beaches, that will likely persist
well into Wednesday morning, and possibly Wednesday afternoon
depending on how fast winds begin to relax. cms

Tuesday Night through Monday:

There may be a few lingering showers in northwest IN early
Tuesday evening otherwise, dry weather is expected for the rest
of the extended period. There may also be a small chance for a
few showers over the weekend near and over Lake Michigan.
Confidence is too low for any precip mention during this time
period. Temperatures are expected to be near seasonal normals
for early/mid August with lower humidity levels. Northeasterly
winds will likely keep temps a few degrees cooler near Lake
Michigan. cms

&&

.AVIATION /18Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 100 PM CDT Mon Aug 5 2024

Aviation concerns through the period:

- Confidence in thunderstorm development this afternoon/evening
  too low to maintain in TAFs.

- Lake breeze expected this afternoon across the eastern
  terminals, bringing north-northeast winds to the area.

- Another wave of showers forecast tonight, however the exact
  timing and location remains low confidence.

After this morning's storms exited the region, MVFR ceilings
quickly dropped south across the northern IL terminals. This
reduction did not persist as long as originally forecast, with
MVFR scattering out already early this afternoon. Instability
remains overhead, and with a boundary lingering nearby, cannot
rule out the redevelopment of thunderstorms late this afternoon
into the evening. Confidence was low on placement and timing,
therefore left out of TAFs at the moment.

A lake breeze is anticipated to develop through the afternoon
and drift wsw, impacting metro terminals. Another wave of active
weather is forecast late tonight into early Tuesday morning, as
another low pressure system slides through southern Wisconsin.
Returned MVFR ceilings and a TEMPO group for -SHRA after 12z,
however this could be moved ahead in time by 1-2 hours depending
on later model guidance and trends. Winds pick up Tuesday
morning into the afternoon, as the low pressure system slowly
drifts across southern Lake Michigan into northern Indiana.

Baker

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement from 9 PM CDT this evening through
     Wednesday afternoon for ILZ006.

     Beach Hazards Statement from Tuesday morning through Wednesday
     afternoon for ILZ103-ILZ104.

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

LM...Small Craft Advisory from 9 PM this evening to 3 PM CDT
     Wednesday for Winthrop Harbor to Wilmette Harbor IL.

     Small Craft Advisory from 10 AM Tuesday to 3 PM CDT Wednesday
     for Wilmette Harbor to Calumet Harbor IL.

     Small Craft Advisory from 1 PM Tuesday to 3 PM CDT Wednesday
     for the IN nearshore waters.

&&

Visit us at weather.gov/chicago

Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
1136 AM CDT Mon Aug 5 2024

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-061645-
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-
1136 AM CDT Mon Aug 5 2024 /1236 PM EDT Mon Aug 5 2024/

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...

  Limited Thunderstorm Risk...with an associated:
     Level 1 and 2 of 5 Damaging Wind Risk...up to 60 mph.
     Level 1 and 2 of 5 Large Hail Risk...up to quarter size.
     Level 1 of 5 Tornado Risk.
  Limited Flooding Risk.

DISCUSSION...

Isolated to widely scattered thunderstorms may develop late this
afternoon into the evening, some of which could become strong to
severe. Additional thunderstorms are possible late tonight through
daybreak Tuesday. Heavy rainfall would accompany any storms that
develop which could result in localized flooding.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Thunderstorms may occur in far northern Illinois early Tuesday
morning and in northwest Indiana Tuesday afternoon. There is a
low chance that these storms will produce damaging winds.

Breezy northeast winds on Tuesday will generate large waves,
leading to dangerous swimming conditions at southern Lake
Michigan beaches.

.SPOTTER INFORMATION STATEMENT...

  Spotter reports may be needed late this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east southeast at 20 to 30 mph.

LMZ740>745-061645-
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-
1136 AM CDT Mon Aug 5 2024

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...This Afternoon and Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Thunderstorm Wind Gust Risk...up to 40 knots.
     Level 1 of 5 Hail Risk...up to quarter size.
  Hazardous conditions for small craft late tonight.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk.
Wednesday...
  Hazardous conditions for small craft are likely.

Petr

Visit us at www.weather.gov/chicago

Follow us on Facebook, Twitter, and Youtube at:
www.facebook.com/nwschicago
www.twitter.com/nwschicago
www.youtube.com/nwschicago

Special Weather Statement
National Weather Service Chicago/Romeoville
930 AM CDT Mon Aug 5 2024

ILZ023-INZ001-010-051515-
Kankakee IL-Newton IN-Lake IN-
930 AM CDT Mon Aug 5 2024

...STRONG THUNDERSTORMS WILL IMPACT EASTERN KANKAKEE...NORTHWESTERN
NEWTON AND SOUTHWESTERN LAKE COUNTIES THROUGH 1015 AM CDT...

At 930 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Manteno to near Grant Park. Movement was
southeast at 15 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Kankakee, Bourbonnais, Bradley, Manteno, Momence, Lake Village, Grant
Park, St. Anne, Aroma Park, Hopkins Park, Sun River Terrace, Sammons
Point, Schneider, and Sumava Resorts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4101 8736 4101 8786 4128 8798 4130 8750
TIME...MOT...LOC 1430Z 333DEG 13KT 4124 8785 4126 8757

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

CMS

Preliminary Local Storm Report
National Weather Service Chicago IL
1120 AM CDT Mon Aug 5 2024

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

0803 AM     Tstm Wnd Dmg     3 N Hegewisch - Chicago 41.69N 87.54W
08/05/2024                   Cook               IL   Public

            large tree uprooted.

&&

sb

Preliminary Local Storm Report
National Weather Service Chicago IL
1208 PM CDT Mon Aug 5 2024

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

0804 AM     Tstm Wnd Dmg     Homer Glen              41.61N 87.95W
08/05/2024                   Will               IL   Emergency Mngr

            Photos showed trees and tree limbs blown
            down near 151st Street and Parker Road. Time
            estimated.

&&

Special Weather Statement
National Weather Service Chicago/Romeoville IL
1239 PM CDT Mon Aug 5 2024

ILZ003-004-008-010>012-019>021-023-032-033-039-106>108-052300-
Winnebago-Boone-Ogle-Lee-De Kalb-Kane-La Salle-Kendall-Grundy-
Kankakee-Livingston-Iroquois-Ford-Northern Will-Southern Will-
Eastern Will-
Including the cities of Rockford, Belvidere, Rochelle, Oregon,
Byron, Dixon, DeKalb, Sycamore, Aurora, Elgin, Ottawa, Streator,
La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris,
Coal City, Minooka, Kankakee, Bourbonnais, Bradley, Pontiac,
Dwight, Fairbury, Watseka, Gilman, Paxton, Gibson City, Joliet,
Bolingbrook, Plainfield, Mokena, Channahon, Manhattan,
Wilmington, Crete, Peotone, and Beecher
1239 PM CDT Mon Aug 5 2024

...HEAT INDEX VALUES OF 100 TO 105 THIS AFTERNOON...

Hot and humid conditions are expected this afternoon. High
temperatures in the upper 80s to around 90, combined with dew
points in the mid 70s, will produce heat index values of 100 to
105 degrees this afternoon.

Take extra precautions if you work or spend time outside. Drink
plenty of fluids and take frequent breaks. Young children and pets
should never be left unattended in vehicles.

Petr