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City of Ottawa IL
Monday August 18th, 2025 :: 05:47 p.m. CDT

Alert

Severe Thunderstorm Watch until 08:00PM

SEVERE THUNDERSTORM WATCH 599, PREVIOUSLY IN EFFECT UNTIL 6 PM CDT THIS EVENING, IS NOW IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 10 COUNTIES IN NORTH CENTRAL ILLINOIS BOONE DE KALB LA SALLE LEE OGLE WINNEBAGO IN NORTHEAST ILLINOIS GRUNDY KANE KENDALL MCHENRY THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE, BYRON, COAL CITY, CRYSTAL LAKE, DEKALB, DIXON, ELGIN, LA SALLE, MARSEILLES, MCHENRY, MENDOTA, MINOOKA, MORRIS, OREGON, OSWEGO, OTTAWA, PLANO, ROCHELLE, ROCKFORD, STREATOR, SYCAMORE, WOODSTOCK, AND YORKVILLE.

* AFFECTED AREAS: BOONE, IL ... DE KALB, IL ... GRUNDY, IL ... KANE, IL ... KENDALL, IL ... LA SALLE, IL ... LEE, IL ... MCHENRY, IL ... OGLE, IL ... WINNEBAGO, IL

Address/Location
City of Ottawa IL
301 W Lafayette St
Ottawa, IL 61350

Contact
Emergency: 9-1-1
Non-emergencies: 815-433-2131

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Alert Details

Severity:
Severe - Significant threat to life or property
Urgency:
Future - Responsive action SHOULD be taken in the near future
Certainty:
Possible (p <= ~50%)
Category:
Meteorological (inc. flood)
Event:
Severe Thunderstorm Watch

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