880
FLUS43 KLOT 172046
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
346 PM CDT Tue Jun 17 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-182100-
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-
346 PM CDT Tue Jun 17 2025 /446 PM EDT Tue Jun 17 2025/

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.
  Limited Flooding Risk.

DISCUSSION...

Scattered thunderstorms are likely tonight, especially this
evening. Cloud to ground lightning, briefly gusty winds, and
torrential downpours will be the primary threats.

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

Wednesday...
  Limited Flooding Risk.
  Elevated Thunderstorm Risk...with an associated:
     Level 3 of 5 Severe Thunderstorm Risk.
Saturday through Monday...
  Elevated Excessive Heat Risk.

DISCUSSION...

Thunderstorms are likely Wednesday. There is a chance that a few
of the storms could be severe, especially across northwest
Indiana. If severe thunderstorms occur, damaging winds, large
hail and tornadoes would all be possible, in addition to locally
heavy rainfall.

Isolated strong storms are possible across southeast Wisconsin
late Thursday afternoon and evening. A few of these could clip
far northeast Illinois near the Wisconsin border, with a brief
damaging wind and hail threat.

Peak afternoon heat indices near or above 100 degrees are
expected this weekend into early next week.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-northeast at 25 mph.

$$

LMZ740>745-182100-
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-
346 PM CDT Tue Jun 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...Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk.

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

Wednesday...
  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
Saturday...
  Hazardous conditions for small craft are likely.

$$

- Izzi

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