Trends are derived from text analysis of Shipping Forecast data from 2010.
Chart shows the proportion of forecasts for this sea area which include each of the wind direction keywords, expressed as a percentage of the total. Forecasts may contain more than one of those keywords.
Figures indicate the number of forecasts for this sea area which include the visibility keywords "very poor", "poor", "moderate", and "good", expressed as a percentage of the total. Forecasts may contain more than one of those keywords.
Maximum and minimum wind speeds are determined from the largest and smallest numeric wind values quoted in the area forecast.
Figures indicate the number of forecasts for this sea area which include the wind keywords "variable" and "cyclonic", expressed as a percentage of the total. Forecasts may contain more than one of those keywords.
Visibility ratings are calculated by allocating points to each area forecast depending on whether it mentions "very poor" (1 point), "poor" (2 points), "moderate" (3 points), or "good" (4 points). Where a forecast contains more than one of those keywords, an average rating is used.
Figures indicate the percentage of forecasts for this sea area which include a gale warning.