Moderate flooding is expected along the Grand River near Sumner, potentially impacting surrounding areas in Linn, Chariton, Carroll, and Livingston Counties. Flooding may pose risks to property, infrastructure, and transportation, particularly in low-lying areas near the river. Motorists are advised to exercise caution as most flood-related fatalities occur in vehicles. Nighttime conditions may further obscure the dangers of flooded roads, increasing the risk of accidents.