The watch would be monitored throughout the day and if conditions became worse, a warning would be issued. Cope said there was currently a “moderate risk” of thunderstorms, making it fairly likely at least a couple of storms would develop. This could result in localised downpours of between 25 to 40mm per hour. Latest MetService National Forecast Video Latest MetService National Forecast Video Surface flooding and potential landslips on steep ground were possible, Cope said. Narrow streams and valleys were most at risk and Cope urged caution for people around those areas. He said people should watch the skies and keep an eye on the MetService website for the latests updates about the watch.