238
FLUS43 KLOT 171637 AAA
HWOLOT

Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
1137 AM CDT Thu Jul 17 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-181645-
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-
1137 AM CDT Thu Jul 17 2025 /1237 PM EDT Thu Jul 17 2025/

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...

  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

High waves and life threatening currents are expected at
unprotected Lake Michigan beaches.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday morning...
  High Swim Risk Lake Michigan Beaches.
Friday night...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Saturday...
  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
  Elevated Flooding Risk.
Sunday and Monday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Tuesday...
  Limited Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Wednesday...
  Elevated Excessive Heat Risk.

DISCUSSION...

High waves will cause dangerous swimming conditions at Lake
Michigan beaches early Friday morning.

There will be periodic bouts of showers and thunderstorms Friday
night through Tuesday. Any storms during this period may be strong
to severe capable of producing damaging winds and torrential
rainfall which could lead to flash flooding.

Dangerous heat and humidity is possible the middle of next week.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

LMZ740>745-181645-
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-
1137 AM CDT Thu Jul 17 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...This Afternoon and Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday night...
  Limited Thunderstorm Risk.
Saturday...
  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

$$

Petr

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