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

Flood Watch
National Weather Service Chicago IL
515 AM CDT Wed Apr 15 2026

ILZ003>006-008-011>013-020-103>108-INZ001-152000-
/O.EXT.KLOT.FA.A.0003.000000T0000Z-260416T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Winnebago-Boone-McHenry-Lake IL-Ogle-De Kalb-Kane-DuPage-Kendall-
Northern Cook-Central Cook-Southern Cook-Northern Will-Southern
Will-Eastern Will-Lake IN-
Including the cities of Mundelein, Algonquin, Rockford, Oak Lawn,
Lemont, Peotone, Downers Grove, Crystal Lake, Woodstock, Joliet,
Bolingbrook, Gurnee, Plano, Oswego, Elgin, Northbrook, Oak
Forest, Oregon, Wheaton, Des Plaines, Buffalo Grove, Schaumburg,
Orland Park, Crete, Oak Park, Channahon, Yorkville, Rochelle,
Manhattan, DeKalb, Chicago, McHenry, Byron, Belvidere, Carol
Stream, Lombard, Wilmington, Mokena, Calumet City, Park Forest,
Aurora, Palatine, Gary, Merrillville, La Grange, Beecher,
Sycamore, Plainfield, Waukegan, Hammond, Cicero, Evanston, and
Naperville
515 AM CDT Wed Apr 15 2026

...FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall remains
  possible.

* WHERE...Portions of Illinois, including the following areas,
  Boone, Central Cook, De Kalb, DuPage, Eastern Will, Kane, Kendall,
  Lake IL, McHenry, Northern Cook, Northern Will, Ogle, Southern
  Cook, Southern Will and Winnebago and northwest Indiana, including
  the following area, Lake IN.

* WHEN...Through late tonight.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
  may occur in poor drainage and urban areas. Roads and streets may
  be flooded.

* ADDITIONAL DETAILS...
  - Multiple rounds of showers and thunderstorms are expected
    through this evening. Elevated soil moisture due to recent
    rainfall is expected to increase the susceptibility to flash
    flooding.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch for flash flooding means rapid-onset flooding is
possible, but not yet certain, based upon the latest forecasts.
Flash flooding is a dangerous situation. Persons with interests
along area rivers, creeks, and other waterways should monitor the
latest forecasts and be prepared to take action should flooding
develop.

&&

$$

Petr

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
147 AM CDT Wed Apr 15 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-160700-
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-
147 AM CDT Wed Apr 15 2026 /247 AM EDT Wed Apr 15 2026/

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

.DAY ONE...Early this Morning through Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Damaging Wind Risk...up to 70 mph.
     Level 2 of 5 Large Hail Risk...up to Half Dollar size.
     Level 1 of 5 Tornado Risk.
  Elevated Flooding Risk.

DISCUSSION...

Additional waves of thunderstorms are expected at times early
this morning through tonight, some of which could be strong to
severe, especially in the afternoon and evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Thunderstorm Risk.
Friday into early Saturday morning...
  Limited Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
Sunday Night...
  Elevated Frost Risk.

DISCUSSION...

Additional waves of storms are expected at times through the end
of the week.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed at times through this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 40 mph.

$$

Hazard Report Provided By forecast.weather.gov