A tropical storm currently hovering over the Bahamas appears to be on its way to Europe, according to Met Office forecasters.
Latest data suggests it will head north, staying offshore from the eastern coast of the US before turning to track east across the Atlantic.
Models appear to show the storm will head in the general direction of UK and continental Europe, but there remains a lot of uncertainty about exactly what it will do once it arrives.
In a blog, the Met Office stated: "The development of extra tropical storms can present complexities for meteorologists, and Bertha is a good example of that.
"If all the models agree, there's higher certainty, if they diverge, we know the atmosphere is finely balanced and there are several possible outcomes.
"In the case of Bertha each of the models we use gives a very different picture of what the storm will do.
"This ranges from Bertha heading towards France as a weak feature which will completely miss the UK, to it arriving as a fairly active summer storm.
"In terms of timing, there's also a spread of possibilities – but it looks likely that the earliest Bertha would affect the UK would be on Sunday or into the start of next week.
"Given the time of year and the potential heavy rain, strong winds and large waves Bertha could bring if it does head to the UK, we'd advise everyone to stay up to date with the latest forecasts and warnings from the Met Office over the next few days."
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