tricky

Assessing the impact of the UK's decision to leave the EU on the economy has been tricky given the multiple economic shocks in recent years.

Day four has been described as his "toughest day" as he navigates through Dumfriesshire into Lanarkshire on "tricky rural terrain".

It means that if the Scots are in pot three they could face a tricky route to a first World Cup in what will be 28 years by the time the tournament rolls around.

All of these factors make forecasting this zone of potentially disruptive snow very tricky - and this uncertainty is likely to stay in weather forecasts until the day before any snow is due to hit.

Why forecasting snow can be tricky.