Understanding 'Unpredictable' in Context

During the rainy season, many regions experience heavy downpours that can lead to flooding. News reports often warn the public about the potential dangers of floodwaters. In these reports, officials typically advise people to remain indoors and avoid unnecessary travel. They emphasize that floodwaters can be unpredictable and may contain hazardous debris. Additionally, they urge residents to prepare emergency kits in case they need to evacuate quickly.