Listen live to MetService's John Law on Checkpoint at 4.05pmRNZnationalFollow our liveblog above for the latest.Plunging temperatures have arrived overnight for much of the country - but the worst is still to come.SH1 in Dunedin between Pine Hill and Waitati is currrently closed due to heavy snow.Schools throughout Dunedin are closed because of the weather and police have urged people to avoid travel in the city unless it's absolutely necessary.Follow our liveblog at the top of this page for the latest.