2 products issued by NWS for: Naperville IL
Hazardous Weather Outlook
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.
$$
Flood Watch
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