Winter coming on week of 19th?

There are indications now in NWP model outputs of a plunge of very cold air from the Arctic bringing snow to Scotland next Monday 18th with wintry conditions on Dartmoor by Wednesday 20th. Far too earlier to talk about severity, but after a benign autumn so far, it will come as a shock and at the very least we will see some frost on Dartmoor with perhaps a few snow showers. Stay tuned, probability of cold weather is increasing and is now rated at 70%.