Another 228 mph jet stream exactly a week after the last one.
A more detailed look at the midnight ascent from Yarmouth Nova Scotia where the wind was blowing 201 knots (231 mph) at 250 hPa.
It’s not surprising that the high cloud has spread south so rapidly in the last few hours as there was a 150 knot northerly jet at midnight down across the country.
I don’t know the exact technical term for this ‘shield’ of cloud is, other than calling it jet stream cirrus but I know its a harbinger of rapid development. I quite like shield of cloud that I’ve coined, who knows perhaps it’ll catch on.