Low plume pattern gives us cold

We've had this pattern earlier and it gives us very cold weather in Toronto.  You can see the Arctic air mass slowly descending.  But the plume patterns haven't been very steady.  In the past I could count on a month with a steady pattern.  But now it's only a week and then something new comes along.  The UK won't enjoy low plumes, they are a result of little heat coming up north.  If the plumes keep cutting under the UK, then it's very cold for them.