Further investigation is conducted by analyzing data from a few stations near the Atlantic coast of Nova Scotia. Visibility data for the period of record for each station, approximately fifty years, are used to determine fog occurrences for each year and month revealing both annual and monthly trends. Parameters, including sea surface temperature, air temperature, relative humidity and wind velocity, are examined to determine correlations with trends found in visibility data. Sea surface temperature data are acquired from offshore buoys plus other sources. Upper air data, available in the area for approximately the past fifty years, provide a means for detecting temperature inversions and very high relative humidity exposing the vertical extent of fog.
More recently, wind profiler data have become available on the southwest coast of Nova Scotia providing data in the boundary layer with enhanced temporal and spatial resolution at a point. These data are used to display greater vertical detail during recent fog events.