Tornado Warning 12, NWS Chicago, IL

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Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
404 PM CDT Tue Apr 14 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-152115-
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-
404 PM CDT Tue Apr 14 2026 /504 PM EDT Tue Apr 14 2026/

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 3 of 5 Tornado Risk.
     Level 3 of 5 Large Hail Risk...up to Tennis Ball size.
     Level 3 of 5 Damaging Wind Risk...up to 75 mph.
     Level 2 of 4 Flash Flood Risk.

DISCUSSION...

An all hazardous significant severe weather threat exists across
northern IL this evening, particularly along and north of I-88.

Multiple rounds of heavy rain producing storms moving over the
same areas may also result in areas of flash flooding tonight.

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

Wednesday...
  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
     Level 2 of 4 Flash Flood Risk.
Thursday...
  Limited Thunderstorm Risk southeast of Interstate-55.
Friday Night into Saturday morning...
  Limited Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
     Level 1 of 4 Flash Flood Risk.
Sunday Night...
  Significant Frost Risk.

DISCUSSION...

Additional waves of storms are expected at times through the end
of the week, some of which could be severe and produce heavy rain
and localized flash flooding.

.SPOTTER INFORMATION STATEMENT...

  Spotters will likely be needed this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 45 mph.

LMZ740>745-152115-
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-
404 PM CDT Tue Apr 14 2026

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...

  Elevated Thunderstorm Risk...with an associated:
     Level 3 of 5 Thunderstorm Wind Gust Risk...up to 55 kt.
     Level 3 of 5 Hail Risk...up to Tennis Ball size.
     Level 3 of 5 Thunderstorm Waterspout Risk.

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

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

KJB

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