Flood Warning issued April 16 at 8:52PM CDT until April 20 at 4:00PM CDT by NWS Chicago IL
Issue date: 2026-04-17T01:52+00:00
...The Flood Warning continues for the following rivers in Illinois... Rock River at Byron affecting Ogle County. Pecatonica River near Shirland affecting Winnebago County. Rock River at Rockton affecting Winnebago County. Rock River at Latham Park affecting Winnebago County. For the Rock River...including Rockton, Latham Park, Byron... Moderate flooding is forecast. * WHAT...Moderate flooding is forecast. * WHERE...Rock River from Confluence with Kishwaukee River to Castle Rock State Park near Oregon, including the Byron gauge. * WHEN...From late tonight to Monday afternoon. * IMPACTS...At 13.5 feet, Numerous low-lying structures downstream of Byron are flooded. * ADDITIONAL DETAILS... - At 8:15 PM CDT Thursday the stage was 12.4 feet. - Forecast...The river is expected to rise above flood stage just after midnight tonight to a crest of 14.0 feet Saturday morning. - Flood stage is 13.0 feet. - http://www.weather.gov/safety/flood
Hydrologic Outlook issued April 16 at 2:19PM CDT by NWS Chicago IL
Issue date: 2026-04-16T19:19+00:00
ESFLOT Additional thunderstorms are expected Friday afternoon and Friday night across northern Illinois and northwest Indiana. Atmospheric conditions are favorable for some of these storms to produce locally heavy rainfall. Many rivers across northern Illinois and northwest Indiana remain elevated. Soil moisture also remains elevated in many areas, especially in northern Illinois along the Wisconsin border. Thus, any heavy rainfall that occurs could lead to flooding of rivers, creeks, urban and low-lying areas. Rivers such as the Rock, Fox and Des Plaines which are already in flood in some locations, may be especially prone to rainfall which could exacerbate ongoing flooding. 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 outlook will be updated by Friday morning.
