Severe thunderstorm watch
000
FLUS43 KLOT 212027
HWOLOT
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
327 PM CDT Fri Aug 21 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-222030-
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 Fri Aug 21 2026 /427 PM EDT Fri Aug 21 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 2 of 5 Damaging Wind Risk... up to 60 mph.
Level 2 of 5 Large Hail Risk... up to golf ball size. Limited Flooding Risk.
DISCUSSION...
Scattered thunderstorms are expected through this evening. The primary threats will be large hail and damaging winds. An isolated tornado will also be possible.
.DAYS TWO THROUGH SEVEN... Saturday through Thursday.
Saturday...
Limited Thunderstorm Risk.
High Swim Risk Lake Michigan Beaches in Porter County. Sunday...
High Swim Risk Lake Michigan Beaches.
Tuesday through Thursday...
Limited Thunderstorm Risk.
DISCUSSION...
Isolated thunderstorms are possible Saturday. Severe weather is not expected.
High waves will create dangerous swimming conditions at Lake Michigan beaches in Porter County Indiana Saturday and possibly at all Lake Michigan beaches Sunday.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed through this evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the southeast at 20 to 30 mph.
$$
LMZ740>745-222030-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
327 PM CDT Fri Aug 21 2026
This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan.
.DAY ONE... Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk... with an associated:
Level 2 of 5 Thunderstorm Wind Gust Risk... up to 50 knots. Level 2 of 5 Hail Risk... up to half dollar size.
.DAYS TWO THROUGH SEVEN... Saturday through Thursday.
Saturday...
Limited Thunderstorm Risk.
Sunday...
Hazardous conditions for small craft are likely.
Tuesday through Thursday...
Limited Thunderstorm Risk.
$$
Visit us at www.weather.gov/chicago
Severe Thunderstorm Watch issued August 21 at 2:58PM CDT until August 21 at 10:00PM CDT by NWS Chicago IL
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 610 IN EFFECT UNTIL 10 PM CDT THIS EVENING FOR THE FOLLOWING
AREAS
IN ILLINOIS THIS WATCH INCLUDES 18 COUNTIES
IN CENTRAL ILLINOIS
LIVINGSTON
IN EAST CENTRAL ILLINOIS
FORD IROQUOIS
IN NORTH CENTRAL ILLINOIS
BOONE DE KALB LA SALLE
LEE OGLE WINNEBAGO
IN NORTHEAST ILLINOIS
COOK DUPAGE GRUNDY
KANE KANKAKEE KENDALL
LAKE IL MCHENRY WILL
IN INDIANA THIS WATCH INCLUDES 2 COUNTIES
IN NORTHWEST INDIANA
LAKE IN NEWTON
THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE, BOLINGBROOK, BOURBONNAIS, BUFFALO GROVE, BYRON, CAROL STREAM, CHICAGO, COAL CITY, CRYSTAL LAKE, DEKALB, DIXON, DOWNERS GROVE, DWIGHT, ELGIN, EVANSTON, FAIRBURY, GARY, GIBSON CITY, GILMAN, GURNEE, HAMMOND, JOLIET, KANKAKEE, KENTLAND, LA SALLE, LEMONT, LOMBARD, MARSEILLES, MCHENRY, MENDOTA, MERRILLVILLE, MINOOKA, MOROCCO, MORRIS, MUNDELEIN, NAPERVILLE, OAK LAWN, OREGON, ORLAND PARK, OSWEGO, OTTAWA, PARK FOREST, PAXTON, PLANO, PONTIAC, ROCHELLE, ROCKFORD, ROSELAWN, SCHAUMBURG, STREATOR, SYCAMORE, WATSEKA, WAUKEGAN, WHEATON, WILMINGTON, WOODSTOCK, AND YORKVILLE.
null
TARGET AREA... Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL; Kankakee, IL; Kendall, IL; Lake, IL; La Salle, IL; Lee, IL; Livingston, IL; McHenry, IL; Ogle, IL; Will, IL; Winnebago, IL; Lake, IN; Newton, IN
FLUS43 KLOT 212027
HWOLOT
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
327 PM CDT Fri Aug 21 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-222030-
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 Fri Aug 21 2026 /427 PM EDT Fri Aug 21 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 2 of 5 Damaging Wind Risk... up to 60 mph.
Level 2 of 5 Large Hail Risk... up to golf ball size. Limited Flooding Risk.
DISCUSSION...
Scattered thunderstorms are expected through this evening. The primary threats will be large hail and damaging winds. An isolated tornado will also be possible.
.DAYS TWO THROUGH SEVEN... Saturday through Thursday.
Saturday...
Limited Thunderstorm Risk.
High Swim Risk Lake Michigan Beaches in Porter County. Sunday...
High Swim Risk Lake Michigan Beaches.
Tuesday through Thursday...
Limited Thunderstorm Risk.
DISCUSSION...
Isolated thunderstorms are possible Saturday. Severe weather is not expected.
High waves will create dangerous swimming conditions at Lake Michigan beaches in Porter County Indiana Saturday and possibly at all Lake Michigan beaches Sunday.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed through this evening.
GENERAL STORM MOTION OF THE DAY:
Moving toward the southeast at 20 to 30 mph.
$$
LMZ740>745-222030-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
327 PM CDT Fri Aug 21 2026
This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan.
.DAY ONE... Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk... with an associated:
Level 2 of 5 Thunderstorm Wind Gust Risk... up to 50 knots. Level 2 of 5 Hail Risk... up to half dollar size.
.DAYS TWO THROUGH SEVEN... Saturday through Thursday.
Saturday...
Limited Thunderstorm Risk.
Sunday...
Hazardous conditions for small craft are likely.
Tuesday through Thursday...
Limited Thunderstorm Risk.
$$
Visit us at www.weather.gov/chicago
Severe Thunderstorm Watch issued August 21 at 2:58PM CDT until August 21 at 10:00PM CDT by NWS Chicago IL
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 610 IN EFFECT UNTIL 10 PM CDT THIS EVENING FOR THE FOLLOWING
AREAS
IN ILLINOIS THIS WATCH INCLUDES 18 COUNTIES
IN CENTRAL ILLINOIS
LIVINGSTON
IN EAST CENTRAL ILLINOIS
FORD IROQUOIS
IN NORTH CENTRAL ILLINOIS
BOONE DE KALB LA SALLE
LEE OGLE WINNEBAGO
IN NORTHEAST ILLINOIS
COOK DUPAGE GRUNDY
KANE KANKAKEE KENDALL
LAKE IL MCHENRY WILL
IN INDIANA THIS WATCH INCLUDES 2 COUNTIES
IN NORTHWEST INDIANA
LAKE IN NEWTON
THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE, BOLINGBROOK, BOURBONNAIS, BUFFALO GROVE, BYRON, CAROL STREAM, CHICAGO, COAL CITY, CRYSTAL LAKE, DEKALB, DIXON, DOWNERS GROVE, DWIGHT, ELGIN, EVANSTON, FAIRBURY, GARY, GIBSON CITY, GILMAN, GURNEE, HAMMOND, JOLIET, KANKAKEE, KENTLAND, LA SALLE, LEMONT, LOMBARD, MARSEILLES, MCHENRY, MENDOTA, MERRILLVILLE, MINOOKA, MOROCCO, MORRIS, MUNDELEIN, NAPERVILLE, OAK LAWN, OREGON, ORLAND PARK, OSWEGO, OTTAWA, PARK FOREST, PAXTON, PLANO, PONTIAC, ROCHELLE, ROCKFORD, ROSELAWN, SCHAUMBURG, STREATOR, SYCAMORE, WATSEKA, WAUKEGAN, WHEATON, WILMINGTON, WOODSTOCK, AND YORKVILLE.
null
TARGET AREA... Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL; Kankakee, IL; Kendall, IL; Lake, IL; La Salle, IL; Lee, IL; Livingston, IL; McHenry, IL; Ogle, IL; Will, IL; Winnebago, IL; Lake, IN; Newton, IN
Information
| Author | Simcha |
| Organization | Kol Simcha Productions |
| Website | - |
Copyright 2026 - Spreaker Inc. an iHeartMedia Company
Comments