The recent cooling of SSTs in the central and eastern Atlantic is a modest risk to our forecast on the less active side.
However, we feel that the recent cooling will not be a trend throughout the entire summer, particularly across the Main Development Region (MDR) as the trade winds and associated upwelling of cooler subsurface water decreases during June and July.
This chart has been developed as an additional reference guide (more so then simply dating off Sturmey-Archer hubs) for the positive identification of Raleigh frames and entire bicycles. Given the number of bicycles produced at Raleigh during any given year versus the relatively small sample size of bikes available to me (200 individual examples at last count), I cannot guarentee absolute accuracy.
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Keep in mind that these charts are incomplete, and there is a reasonably wide margin of error between serial cutoff dates.
There isn't enough data to claim either option as absolute.
Without them, a lot of this would not have been possible.
Thanks also go to the many people who have written with comments and suggestions.