292
FLUS43 KLOT 150926
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
426 AM CDT Tue Jul 15 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-160930-
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-
426 AM CDT Tue Jul 15 2025 /526 AM EDT Tue Jul 15 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk south of I-80.

DISCUSSION...

Widely scattered thunderstorms are expected this afternoon into
early this evening. Where there is a slight chance of
thunderstorms as far north as I-80, the greatest coverage of
storms will likely be near and south of Highway 24.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday afternoon and evening...
  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
  Elevated Flooding Risk.
  Limited Excessive Heat Risk.
Thursday...
  Limited Thunderstorm Risk south of I-80.
  Limited Flooding Risk well south of I-80.
Saturday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
Sunday and Monday...
  Limited Thunderstorm Risk.

DISCUSSION...

Peak heat indices Wednesday afternoon are expected to be around
100 degrees.

Thunderstorms are likely Wednesday afternoon into Wednesday
evening, mainly across northern Illinois. There is the threat that
some of the storms could become severe, posing a risk of locally
damaging winds. In addition, thunderstorms will be capable of
producing torrential downpours which could lead localized flash
flooding.

There will be periodic bouts of showers and thunderstorms
Saturday through Monday. Any one of which could produce very heavy
rainfall and flooding.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the northwest at around 20 mph.

$$

LMZ740>745-160930-
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-
426 AM CDT Tue Jul 15 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...Today and Tonight.

  No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday evening...
  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
Thursday afternoon and night...
  Hazardous conditions for small craft are likely.
Saturday through Monday...
  Limited Thunderstorm Risk at times.

$$

- Izzi

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