Polygon-Based River Flood Warnings

Des Plaines River flooding April 2013In August 2013, NWS Chicago implemented polygon-based river flood warnings and statements for river forecast locations in our area of responsibility. Instead of highlighting the entire county on the Watch/Warning/Advisory map on the front page of our web site, only the area along the river in proximity to the river forecast point will be highlighted in green.

Important Note: The highlighted areas are not inundation maps, but are simply a means to graphically represent select rivers where we provide flood forecast and warning service.

 example of river flood polygons


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