One product issued by NWS for: Ottawa IL
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
410 AM CDT Tue Sep 15 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-160915-
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-
410 AM CDT Tue Sep 15 2026 /510 AM EDT Tue Sep 15 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...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Damaging Wind Risk...up to 60 mph.
Elevated Flooding Risk.
DISCUSSION...
Scattered non severe showers and thunderstorms are expected this
morning north of I-80.
Additional thunderstorms are likely late this afternoon into
tonight, mainly along and south of I-80. A few of these storms
this afternoon and evening could produce locally strong winds.
Torrential downpours will also accompany these storms, and may
result in localized flash flooding.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday.
Wednesday through Saturday...
Limited Thunderstorm Risk.
Limited to Elevated Flooding Risk.
Sunday and Monday...
Limited Thunderstorm Risk.
DISCUSSION...
Additional episodes of showers and storms are expected in the
general area through the week. Repeated downpours may lead to
localized flooding.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be necessary through tonight.
GENERAL STORM MOTION OF THE DAY:
Moving toward the east northeast around 40 mph
$$