A powerful jet stream stretching across the Atlantic into the UK will steer a number of active weather systems across the UK during Monday and Tuesday. A front will cross from the west on Monday and Monday night bringing 20-40 mm of rain to northern and western areas along with gales, severe on some coasts and hills. The windy weather will be maintained well into Tuesday by a vigorous depression crossing northern Scotland. Developments are complex so there is still some uncertainty in the detail, especially by Tuesday, and this warning will be kept under review

An unseasonably windy spell is likely across many parts of the UK later on Monday, overnight and well into Tuesday, as active frontal systems sweep across the UK. An initial swathe of southerly gales accompanied by heavy rain will move east across many parts later on Monday, giving gusts of 40-50 mph widely but 60-70 mph across exposed Irish Sea and perhaps some English Channel coasts. Winds will become west or southwesterly on Tuesday, with further gusts to 40-50 mph more locally, before gradually easing later. Large waves will affect some coasts in the west and south at times.

Given the unseasonable nature of the winds, the public should be aware of the potential for disruption to transport and outdoor activities. Damage to some trees seems likely.

Rain will become persistent and heavy on Monday evening, before easing after midnight. The public should be aware of the risk of some localised flooding and disruption to travel. An active frontal system will move northeastwards across Wales on Monday evening and night. Following this afternoon's showers, this will bring a spell of persistent rain through the evening which will be heavy at times, producing rainfall totals of around 40 mm in 6 hours in places. This may lead to localised flooding of low-lying roads and some disruption to travel.

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The rain will persist into the early hours of Tuesday morning but ease in intensity before clearing by late morning.