747
FLUS43 KLOT 182028
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
328 PM CDT Fri Apr 18 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-192030-
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-
328 PM CDT Fri Apr 18 2025 /428 PM EDT Fri Apr 18 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...with an associated:
     Level 2 of 5 Large Hail Risk...up to 2 inches in diameter.
     Level 2 of 5 Damaging Wind Risk...up to 60 mph.
     Level 1 of 5 Tornado Risk.
  Limited Non-Thunderstorm Wind Risk.

DISCUSSION...

Southwest winds will gust to 35 to 40 mph through early this
evening.

Scattered thunderstorms are expected to develop this evening,
primarily along and southeast of a line from near LaSalle-Peru to
Chicago. Some of the storms could be severe with large hail,
possibly up to 2 inches in diameter, the greatest threat. There
is also the potential for locally damaging winds and perhaps a
tornado, especially if thunderstorms become more widespread and
are able to organize into a line.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Sunday and Tuesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter reports may be needed this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-northeast at 50 to 60 mph.

$$

LMZ740>745-192030-
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-
328 PM CDT Fri Apr 18 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...

  Gale force winds this evening.
  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Hail Risk...up to 2 inches in diameter.
     Level 2 of 5 Thunderstorm Wind Gust Risk...up to 50 kt.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Sunday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk at night.
Monday...
  Hazardous conditions for small craft are likely.

$$

Castro

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