Hazard Report Provided By forecast.weather.gov

Hydrologic Outlook
ILC007-031-037-043-053-063-075-089-091-093-097-099-103-105-111-141-
197-201-INC007-073-089-111-127-151700-

Hydrologic Outlook
National Weather Service Chicago IL
1233 PM CDT Tue Apr 14 2026

...Waves of rainfall may lead to flooding through the end of the
week...

Waves of showers and thunderstorms are expected this evening through
the end of the week. Urban and river flooding will be possible.

Atmospheric conditions are favorable for some thunderstorms to have
rainfall rates in excess of 1 to 2 inches per hour tonight and
tomorrow. In addition, some rivers and streams remain elevated from
recent rainfall and soil moisture is elevated across most of
northern Illinois and northwestern Indiana. In urban and poor
drainage areas isolated flooding of roadways, creeks, and streams
may occur with areas of heaviest rainfall. Widespread rainfall may
also lead to river rises and possible flooding, in particular along
already elevated rivers such as the Fox, Des Plaines, and Kankakee.
Additional chances for rainfall are expected to continue through the
remainder of the week.

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 product will be updated by tomorrow morning.
$$

WSL

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
454 AM CDT Tue Apr 14 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-151000-
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-
454 AM CDT Tue Apr 14 2026 /554 AM EDT Tue Apr 14 2026/

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 3 of 5 Tornado Risk.
     Level 3 of 5 Large Hail Risk...up to Tennis Ball size.
     Level 2 of 5 Damaging Wind Risk...up to 70 mph.
     Level 1 of 4 Flash Flood Risk.

DISCUSSION...

Non-severe thunderstorms will continue to drift from west to east
across the area this morning, with primary hazards being small
hail and lightning.

Severe thunderstorms are then possible this afternoon through the
evening and overnight hours.

If thunderstorms develop during the afternoon into early evening,
they will be capable of destructive hail, damaging winds, and
tornadoes, some potentially strong in far northern Illinois.

Any thunderstorms that develop from mid evening through the
overnight hours will be capable of damaging winds, hail, and
embedded brief tornadoes. Multiple rounds of storms over the same
areas overnight may also lead to flash flooding.

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

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

DISCUSSION...

Waves of storms are expected at times through the end of the
week, some of which could be severe.

.SPOTTER INFORMATION STATEMENT...

  Spotters will likely be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 45 mph.

$$

Hazard Report Provided By forecast.weather.gov