On December 24, 2015 the Electricity Supply Board networks says that around 6,000 customers are without power as a result of Storm Eva. The worst affected areas are Fermoy in County Cork and Kilcoole in County Wicklow. High winds and heavy rain batter the west and northwest as Storm Eva moves across the country.

Storm Eva, also called Chuck, Staffan and other names, is the fifth named storm of the Met Office and Met Éireann‘s Name our Storms project. Heavy rainfall from Eva occur around three weeks after Storm Desmond had brought severe flooding to parts of Northern England, exacerbating the ongoing situation. The low pressure is named Chuck by the Free University of Berlin and Staffan by the Swedish Meteorological and Hydrological Institute.

Eva is the fifth storm to be officially named by Met Éireann on December 22, 2015. An orange wind warning is issued for counties Clare, Galway, Mayo, Sligo and Donegal on the same day. Gales are also expected in the northwest of the United Kingdom, with storm force winds over parts of the Outer Hebrides. There are fears that the storm could cause further disruption to Cumbria in England, where areas were already dealing with the aftermath of flooding from Storm Desmond and in some cases had been flooded twice already. The army and Environment Agency staff are called in to be on stand-by to bolster flood defences.

Rain associated with the passage of Eva causes disruption when rivers burst their banks in the Cumbrian towns of Appleby-in-Westmorland, Keswick and Kendal on the December 22. Appleby-in-Westmorland receives three to four feet of flood water. The village of Glenridding is flooded for the third time in the month. Six thousand houses in Ireland are left without power. In London, Secretary of State for Environment, Food and Rural Affairs Liz Truss convenes a Cabinet Office Briefing Rooms (COBR) meeting to decide on emergency measures, which include the deployment of soldiers from the 2nd Battalion, Duke of Lancaster’s Regiment to the affected areas. On December 24, flood defence gates are closed in Carlisle, Keswick and Cockermouth to limit the damage expected from rainfall and 20 water pumps and two kilometres of temporary flood barriers are transported to northern England. Ferries operating between Dublin and Holyhead are cancelled due to bad weather on the Irish Sea.