This is a known issue on the A320 family, especially in those weather conditions that were prevailing on the respective night in SOF: moderate to heavy snow all night long with significant sub-zero temperatures.
During cockpit preparation the PROBE/WINDOW HEAT p/b is switched from AUTO to ON according FCOM PRO-NOR-SUP-ADVWXR. This is in order to keep the windshields and windows clear. However, if any snow on the windows is not removed prior to switching on the window heat, the snow will melt and the draining water might refreeze on the cold fuselage. Unfortunately the path of the melting water leads to ice ridges directly in front of the pitot tubes.
Therefore there are two cautions in the FCOM. One is located directly before the aforementioned action line in the Cockpit Preparation:
CAUTION: With ice or snow accumulated on the windshield and/or the upper cockpit fuselage, and if the PROBE/WINDOW HEAT is on, melted ice or snow running down from these areas could re-freeze on the fuselage area below, if the temperature is very low. This could create ice build-up on the forward fuselage that could possibly disturb the airflow around the static/pitot/angle-of-attack probes.
Another caution is located in the De-Icing Procedure unter UPON COMPLETION OF THE SPRAYING OPERATION below the action line PITOTS and STATICS (ground crew) ... CHECK:
CAUTION: When the OAT is low (below -5 °C) during snow/freezing rain precipitations, melted snow or raindrops may drip from the cockpit windshields and freeze on the fuselage below. This could create ice build up on the forward fuselage that could possibly disturb the airflow around the static/pitot/angle-of-attack probes, and result in unreliable air data measurements during takeoff. Therefore, during taxi out before takeoff, beware of this possible build up of ice. The area around static/pitot/angle-of-attack probes must be free of ice/snow before starting takeoff.
So it is essential that the snow from the windows and upper fuselage above the flight deck is removed and that the area in front of the pitot probes is checked if conditions are so that existing melting water might refreeze.
Otherwise it will look like on the picture below...