Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
230 PM CDT Thu Apr 16 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-171930-
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-
230 PM CDT Thu Apr 16 2026 /330 PM EDT Thu Apr 16 2026/

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

.DAY ONE...This afternoon and tonight.

Weather hazards expected...

  Limited Thunderstorm Risk this afternoon in northwestern Indiana.
  Significant Fog Risk.

DISCUSSION...

A thunderstorm or two may move across northwestern Indiana through
this evening.

Dense fog is expected to move inland from Lake Michigan after
sunset.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Significant Fog Risk in the morning.
  Elevated Flooding Risk.
  Significant Thunderstorm Risk...with an associated:
     Level 3 of 5 Severe Thunderstorm Risk.
Saturday night into Sunday morning:
  Elevated  frost and freeze Risk.

DISCUSSION...

A line of thunderstorms is expected to move across the area late
Friday afternoon through Friday night. Pockets of damaging winds,
damaging hail, and even a tornado may occur especially along and
west of Interstate 39.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the southeast at 25 mph.

$$

Hydrologic Outlook
ILC007-031-037-043-053-063-075-089-091-093-097-099-103-105-111-141-
197-201-INC007-073-089-111-127-170330-

Hydrologic Outlook
National Weather Service Chicago IL
219 PM CDT Thu Apr 16 2026

...Another round of thunderstorms expected Friday afternoon and
Friday night...

Additional thunderstorms are expected Friday afternoon and Friday
night across northern Illinois and northwest Indiana. Atmospheric
conditions are favorable for some of these storms to produce locally
heavy rainfall.

Many rivers across northern Illinois and northwest Indiana remain
elevated. Soil moisture also remains elevated in many areas,
especially in northern Illinois along the Wisconsin border. Thus,
any heavy rainfall that occurs could lead to flooding of rivers,
creeks, urban and low-lying areas. Rivers such as the Rock, Fox and
Des Plaines which are already in flood in some locations, may be
especially prone to rainfall which could exacerbate ongoing flooding.

This outlook means that elevated water levels and potential impacts
are possible, but not yet certain. Persons should closely monitor
forecasts including the possibility of flood watches, warnings, and
advisories.

This outlook will be updated by Friday morning.

$$

Ratzer

Hazard Report Provided By forecast.weather.gov