sheet ice

Relating this to a normal road car, it might feel like driving off a snowy road and on to sheet ice.

"The car is likely to feel like it's driving on sheet ice at that point," said Wing Commander Green.

With such a quick turnaround, in such times, the “sheet ice” is particularly slippery.

So she expands: “I’ve been thinking about them in my head for 20 years, and if there’s one thing I’ve learned over those 20 years, it’s that the book already exists and we have to come out to meet it and excavate it and deliver it. There’s a lot of trust involved in that, especially when you’re moving on sheet ice. The pact with the book is one that means it will always be as up-to-the-moment as possible and that’s a massive risk to take.”

It said driving snow, sheet ice and lightning were plaguing its efforts to restore power.