Moderate to heavy showers with chance of thunderstorms are forecast for today, Sunday across Saint Vincent and the Grenadines as a tropical wave affects the islands. Residents and motorists in areas prone to flooding and landslides, and near rivers and streams are asked to exercise caution. Showers from time to time will linger into Monday. Dry air intrusion will result in mostly fair conditions from Monday night into Tuesday, and occasional scattered showers are forecast from around Tuesday night into Wednesday.