Cooler air is slipping in with the unsettled weather. A complex system of low pressure will be circulating around the Isles and each model has different thoughts on where those low pressure cores will go. There is however agreement that some areas will see some frosts, notably on Wednesday into

Unsettled weather will be heading to the British Isles as high pressure breaks down and the jet stream sweeps south, allowing low pressure systems to dominate for a time. Below is a screenshot of the mean height of the 500mb pressure level for the 5-day period ending Sunday April 20,