Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1108 AM CDT Mon Jul 27 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-281615-
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-
1108 AM CDT Mon Jul 27 2026 /1208 PM EDT Mon Jul 27 2026/

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 1 of 5 Tornado Risk.
     Level 3 of 5 Damaging Wind Risk...locally up to 70 mph.
     Level 2 of 5 Large Hail Risk...up to golf ball size.
  Limited Flooding Risk.
  Significant Excessive Heat Risk.
  High Swim Risk Lake Michigan Beaches late tonight.

DISCUSSION...

Periods of thunderstorms will be possible this afternoon and
evening. If storms occur, they may become severe with large hail
and damaging winds.

Outside of any storms, stifling humidity will combine with
hot temperatures to produce dangerous heat indices between 100
and 115 degrees. The highest heat indices are expected near the
I-39 corridor.

Large waves and dangerous currents are expected at unprotected
Lake Michigan beaches late tonight.

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

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

DISCUSSION...

Thunderstorms are possible late this morning, some of which may
produce locally damaging wind gusts and large hail.

Additional thunderstorms may occur late this afternoon into this
evening. Any storms that do develop would likely become severe and
be capable of producing damaging winds and large hail.

In areas not affected by storms or cloudiness from storms, peak
heat indices of 100 to 110 degrees are expected this afternoon.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed today into this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the southeast at 30 mph.

$$

Severe Thunderstorm Warning
ILC031-INC089-271915-
/O.NEW.KLOT.SV.W.0207.260727T1828Z-260727T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville
128 PM CDT Mon Jul 27 2026

The National Weather Service in Chicago has issued a

* Severe Thunderstorm Warning for...
  Southeastern Cook County in northeastern Illinois...
  Northern Lake County in northwestern Indiana...

* Until 215 PM CDT.

* At 128 PM CDT, a severe thunderstorm was located over Riverdale, or
  over Roseland, moving southeast at 30 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...
  Chicago, Hammond, Gary, Oak Lawn, Calumet City, Portage,
  Merrillville, Chicago Heights, Roseland, South Shore, East Chicago,
  Schererville, Hobart, Lansing, Harvey, Highland, Blue Island,
  Munster, Dolton, Homewood, Alsip, Steger, Chatham, Auburn Gresham,
  and South Holland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4147 8722 4147 8763 4170 8776 4176 8756
      4176 8754 4171 8753 4167 8747 4167 8744
      4168 8743 4167 8742 4165 8744 4164 8743
      4162 8729 4162 8722
TIME...MOT...LOC 1828Z 335DEG 26KT 4167 8761

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Borchardt

Severe Weather Statement
National Weather Service Chicago/Romeoville
127 PM CDT Mon Jul 27 2026

ILC031-197-271837-
/O.EXP.KLOT.SV.W.0200.000000T0000Z-260727T1830Z/
Will IL-Cook IL-
127 PM CDT Mon Jul 27 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WILL AND
SOUTHEASTERN COOK COUNTIES WILL EXPIRE AT 130 PM CDT...

The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However, small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern Illinois.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Chicago.

&&

LAT...LON 4149 8794 4165 8790 4164 8753 4130 8753
      4130 8788 4146 8800
TIME...MOT...LOC 1827Z 331DEG 27KT 4130 8760

$$

Borchardt

Flash Flood Warning
ILC031-197-272200-
/O.NEW.KLOT.FF.W.0038.260727T1805Z-260727T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Chicago IL
105 PM CDT Mon Jul 27 2026

The National Weather Service in Chicago has issued a

* Flash Flood Warning for...
  Southeastern Cook County in northeastern Illinois...
  Central Will County in northeastern Illinois...

* Until 500 PM CDT.

* At 105 PM CDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing rainfall rates of 1 to 2 inches per hour.
  Up to 2 inches of rain have fallen. Flash flooding is ongoing or
  expected to begin shortly.

  HAZARD...Flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Rapid-onset flooding of creeks, streams, drainage
           ditches, streets, underpasses, low-lying areas, and
           other poor drainage areas.

* Some locations that will experience flash flooding include...
  Chicago, Joliet, Orland Park, Tinley Park, Oak Lawn, Calumet City,
  Woodridge, Chicago Heights, Roseland, Lansing, Oak Forest, Harvey,
  Lockport, New Lenox, Homer Glen, Blue Island, Dolton, Park Forest,
  Homewood and Alsip.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means rapid-onset flooding is imminent or may
already be occurring. Persons along creeks, drainage ditches, and
other waterways should take immediate precautions to protect life
and property.

&&

LAT...LON 4169 8797 4172 8791 4172 8753 4130 8753
      4129 8802 4169 8804 4169 8803

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

WSL

Flash Flood Warning
ILC031-043-272100-
/O.NEW.KLOT.FF.W.0037.260727T1702Z-260727T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Chicago IL
1202 PM CDT Mon Jul 27 2026

The National Weather Service in Chicago has issued a

* Flash Flood Warning for...
  Cook County in northeastern Illinois...
  Eastern DuPage County in northeastern Illinois...

* Until 400 PM CDT.

* At 1202 PM CDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing rainfall rates of 1 to 2 inches per hour.
  Up to 2 inches of rainfall has occurred due to these storms in
  northwestern Cook County. Flash flooding is ongoing or expected to
  begin shortly.

  HAZARD...Flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Rapid-onset flooding of creeks, streams, drainage
           ditches, streets, underpasses, low-lying areas, and
           other poor drainage areas.

* Some locations that will experience flash flooding include...
  Chicago, Cicero, Arlington Heights, Evanston, Schaumburg,
  Bolingbrook, Palatine, Skokie, Des Plaines, Oak Lawn, Berwyn,
  Mount Prospect, Wheaton, Hoffman Estates, Oak Park, Downers Grove,
  Glenview, Elmhurst, Lombard and Buffalo Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means rapid-onset flooding is imminent or may
already be occurring. Persons along creeks, drainage ditches, and
other waterways should take immediate precautions to protect life
and property.

&&

LAT...LON 4215 8824 4215 8774 4211 8770 4208 8767
      4199 8764 4197 8762 4195 8762 4193 8761
      4190 8758 4188 8760 4185 8759 4177 8755
      4176 8752 4172 8751 4172 8791 4168 8797
      4169 8803 4173 8803 4199 8818

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

WSL

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 520
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM EDT MON JUL 27 2026

SEVERE THUNDERSTORM WATCH 520 IS IN EFFECT UNTIL 800 PM EDT
FOR THE FOLLOWING LOCATIONS

ILC031-043-075-091-097-197-280000-
/O.NEW.KWNS.SV.A.0520.260727T1645Z-260728T0000Z/

IL
.    ILLINOIS COUNTIES INCLUDED ARE

COOK                 DUPAGE              IROQUOIS
KANKAKEE             LAKE                WILL
$$

Coastal Hazard Message
National Weather Service Chicago IL
1120 AM CDT Mon Jul 27 2026

ILZ006-103-104-INZ001-002-280030-
/O.CON.KLOT.BH.S.0009.260728T0800Z-260729T1500Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
1120 AM CDT Mon Jul 27 2026

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM LATE TONIGHT
THROUGH WEDNESDAY MORNING...

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

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

* WHEN...From late tonight through Wednesday morning.

* 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.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
933 AM CDT Mon Jul 27 2026

ILZ006-013-103>105-INZ001-010-011-019-280045-
/O.CON.KLOT.HT.Y.0004.000000T0000Z-260728T0200Z/
Lake IL-DuPage-Northern Cook-Central Cook-Southern Cook-Lake IN-
Newton-Jasper-Benton-
Including the cities of Kentland, Des Plaines, Cicero, Gary,
Palatine, Hammond, Chicago, Oak Park, Oak Lawn, Fowler, DeMotte,
Lombard, Lemont, Naperville, Oak Forest, Morocco, Orland Park, La
Grange, Northbrook, Calumet City, Park Forest, Roselawn,
Evanston, Downers Grove, Merrillville, Carol Stream, Mundelein,
Waukegan, Buffalo Grove, Wheaton, Oxford, Gurnee, Rensselaer, and
Schaumburg
933 AM CDT Mon Jul 27 2026 /1033 AM EDT Mon Jul 27 2026/

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT /10 PM EDT/ THIS
EVENING...

* WHAT...Heat index values in excess of 105 expected.

* WHERE...In Illinois, Central Cook, DuPage, Lake IL, Northern Cook,
  and Southern Cook Counties. In Indiana, Benton, Jasper, Lake IN,
  and Newton Counties.

* WHEN...Until 9 PM CDT /10 PM EDT/ 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.

&&

$$

Doom

Hazard Report Provided By forecast.weather.gov