Trends for individual sea areas: Viking, North Utsire, South Utsire, Forties, Cromarty, Forth, Tyne, Dogger, Fisher, German Bight, Humber, Thames, Dover, Wight, Portland, Plymouth, Biscay, Trafalgar, Fitzroy, Sole, Lundy, Fastnet, Irish Sea, Shannon, Rockall, Malin, Hebrides, Bailey, Fair Isle, Faeroes, South-east Iceland.
Trends are derived from text analysis of Shipping Forecast data from 2010.
Maximum and minimum wind speeds are determined from the largest and smallest numeric wind values quoted in each area forecast.
The average of the minimum and maximum wind speeds for each area (as defined above), for each month.
Figures indicate the number of forecasts for each 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.
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.
The average visibility rating (as defined above) for each area, for each month.
Figures indicate the percentage of forecasts for each area which include a gale warning.
Figures indicate the percentage of forecasts for all sea areas which include a gale warning.