Originally Posted by eaglefly

In the ATR (and Embraer RJ) at Eagle any ice observed on the side windows is to be taken as a clue the airplane is operating in conditions outside normal certification and the autopilots should be disengaged and the conditions exited ASAP. Buffalo is a known ice factory. The surface winds were out of the southwest but at middle altitudes above 3000 feet, the wind was likely out of the west bringing in moisture from Lake Erie. It appears most aircraft were complaining of ice above 3000 but seeing it slide off at lower altitude with less moisture and slightly warmer temps. I wonder if this was just run of the mill ice or was it frezzing drizzle (super cooled water droplets) that can run back behind the wing and tail ice protection to cause problems.