SCAT
We were scheduled to fly at that time, but postponed for 3 hours, couldnīt even get 200M visibility, when we did take off, as did the Transair flight in front of us, we picked up a lot of ice, and couldnīt clear Servere Icing until FL120, then Moderate Icing until FL220. The worst bit was Grnd to 1000 ft.
No warning from ATC until after we took off.