Met Office spokesperson Grahame Madge said: “These systems have a long reach, it will increase rainfall rates and also winds to bring unsettled weather to the UK.”
Nigel’s arrival will come days after Hurricane Lee – the tail end of which is currently lashing parts of Wales, the North West of England and parts of Scotland.
Yellow weather warnings for rain are in place – some until Wednesday evening – amid fears homes and businesses could flood in the hardest-hit areas.
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Some western areas could see 100mm in rainfall – rising to 200mm in higher-altitude areas like Eryri National Park, also known as Snowdonia.
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Mr Madge added: “Although we’ve indicated that there could be flooding associated with the reasonably high levels of rainfall, that’s not something anticipated to be widespread.
“It’s something that may be a consequence of a catchment that suddenly gets more inundated or there are blockages in drainage.”
He went on to explain that Hurricane Lee has brought more moisture to the UK, along with higher air temperatures, resulting in greater levels of rainfall.