Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
218 PM CDT Mon Jul 27 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-281930-
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-
218 PM CDT Mon Jul 27 2026 /318 PM EDT Mon Jul 27 2026/

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

DISCUSSION...

Periods of thunderstorms are expected this afternoon and evening.
Any storms that develop may become severe and feature damaging to
destructive wind gusts, large hail, and localized flash flooding.

Outside of areas impacted by afternoon thunderstorms, dangerous
heat and humidity will continue through the remainder of this
afternoon.

Gusty northerly winds will lead to high waves and dangerous
swimming conditions at Lake Michigan beaches late tonight through
Wednesday morning.

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

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

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the southeast at 40 mph.

$$

Flood Warning
National Weather Service Chicago IL
309 PM CDT Mon Jul 27 2026

...The National Weather Service in Chicago IL has issued a Flood
Warning for the following rivers in Illinois...Indiana...

  Little Calumet River at Munster (Hohman Avenue) affecting Cook
  and Lake IN Counties.

For the Little Calumet River...including Munster (Hohman Avenue)...
Minor flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These forecasts are based on observed precipitation as well as
forecast precipitation 24 hours into the future. Changes to the
rainfall forecast, or any additional rainfall after 24 hours, may
cause changes to these river forecasts.

Additional information is available at www.weather.gov.

The next statement will be issued by Tuesday morning.

&&

ILC031-INC089-281415-
/O.NEW.KLOT.FL.W.0061.260727T2100Z-260728T1800Z/
/LCMI3.1.ER.260727T2300Z.260728T0300Z.000000T0000Z.NO/
309 PM CDT Mon Jul 27 2026

...FLOOD WARNING IN EFFECT UNTIL EARLY TOMORROW AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Little Calumet River from IN-912 in Hammond downstream to
  confluence with Thorn Creek in South Holland, including the
  Munster (Hohman Avenue) gauge.

* WHEN...Until early tomorrow afternoon.

* IMPACTS...At 12.5 feet, Most areas outside of the levee-protected
  area are inundated in Hammond and Munster.

* ADDITIONAL DETAILS...
  - At 2:00 PM CDT Monday the stage was 9.3 feet.
  - The river has begun rising quickly due to earlier heavy
    rainfall.
  - Forecast...The river is expected to rise above flood stage by
    this evening and crest near 12.5 feet late this evening.
  - Flood stage is 12.0 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4163 8756 4159 8740 4153 8743 4157 8758


$$

WSL

Flash Flood Statement
National Weather Service Chicago IL
219 PM CDT Mon Jul 27 2026

ILC031-272200-
/O.CON.KLOT.FF.W.0038.000000T0000Z-260727T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-
219 PM CDT Mon Jul 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM CDT THIS
AFTERNOON FOR SOUTHEASTERN COOK COUNTY...

At 219 PM CDT, Doppler radar and automated rain gauges indicate that
heavy rain fell across the warned area. Up to 2 inches of rain have
fallen.

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, Orland Park, Tinley Park, Oak Lawn, Calumet City, Chicago
  Heights, Roseland, Lansing, Oak Forest, Harvey, Blue Island,
  Dolton, Park Forest, Homewood, Alsip, Matteson, Frankfort, Palos
  Hills, Steger and South Holland.

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 4147 8779 4156 8779 4156 8782 4166 8783
      4172 8791 4172 8753 4147 8753

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

$$

Borchardt

Flash Flood Statement
National Weather Service Chicago IL
218 PM CDT Mon Jul 27 2026

ILC031-043-272100-
/O.CON.KLOT.FF.W.0037.000000T0000Z-260727T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-DuPage IL-
218 PM CDT Mon Jul 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 PM CDT THIS
AFTERNOON FOR NORTHERN COOK AND NORTHEASTERN DUPAGE COUNTIES...

At 218 PM CDT, Doppler radar and automated rain gauges indicated
that heavy rain fell across the warned area. Up to 2 inches of rain
have fallen.

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, Evanston, Schaumburg, Skokie, Oak Lawn, Berwyn,
  Wheaton, Oak Park, Downers Grove, Glenview, Elmhurst, Lombard,
  Bartlett, Ohare Airport, Streamwood, Carol Stream, Hanover Park,
  Park Ridge and Addison.

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 4199 8776 4210 8778 4215 8774 4208 8767
      4199 8764 4197 8762 4193 8761 4190 8758
      4188 8760 4185 8759 4177 8755 4176 8752
      4172 8751 4172 8791 4174 8792 4177 8801
      4199 8818

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

$$

Borchardt

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
$$

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