075
FLUS43 KLOT 170951
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
451 AM CDT Tue Jun 17 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-181000-
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-
451 AM CDT Tue Jun 17 2025 /551 AM EDT Tue Jun 17 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...

  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Damaging Wind Risk...up to 60 mph.
     Level 1 of 5 Large Hail Risk...up to quarter size.
  Limited Flooding Risk.

DISCUSSION...

Scattered thunderstorms are expected to develop across Illinois
portions of the forecast area late this afternoon and early
evening. Some of these storms may be strong to severe, with
damaging winds the main severe weather threat. Additional clusters
of thunderstorms may redevelop overnight. These storms may
produce torrential downpours, which could lead to localized
flooding.

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

Wednesday...
  Limited Flooding Risk.
  Elevated Thunderstorm Risk...with an associated:
     Level 3 of 5 Severe Thunderstorm Risk.
Thursday...
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Saturday through Monday...
  Limited Excessive Heat Risk.

DISCUSSION...

Thunderstorms are likely Wednesday ahead of a cold front which
will move through the area Wednesday evening. Strong to severe
thunderstorms are possible especially during the afternoon hours.
Damaging winds, large hail and brief tornadoes are 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.


.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed late this afternoon and early evening.


GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-northeast at 25-30 mph.

$$

LMZ740>745-181000-
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-
451 AM 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...Today and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Thunderstorm Wind Gust Risk...up to 50 knots.
     Level 1 of 5 Hail Risk...up to quarter size.

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

Wednesday...
  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
Thursday...
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.

$$

Ratzer

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