The Flood Warning affects residents in northwestern Illinois, particularly in Henry, Mercer, Rock Island, and Whiteside counties. Flooding of rivers, creeks, streams, and other low-lying areas is either occurring or imminent. Urban areas and small streams are at risk of being overwhelmed by excessive rainfall, leading to standing or slow-moving water. The primary risks include road closures, potential vehicle stalling, and dangerous conditions for pedestrians and drivers. Most flood-related fatalities occur in vehicles, emphasizing the importance of avoiding flooded roads.