An area of rain is forecast to develop over eastern and central England, moving northwest towards northern England and north Wales on Wednesday afternoon. The rain may become slow-moving, heavy, and persistent, particularly over north-facing hills, before clearing by Thursday morning. There is uncertainty about where the heaviest rainfall will occur, so the warning is likely to be updated. Most areas can expect 30-40 mm of rain, with some areas possibly seeing 60-80 mm. There is also a small chance of much higher totals, around 100-150 mm in upland areas. To prepare for potential flooding, check if your property is at risk and consider creating a flood plan and emergency kit. Stay informed of road, bus, and train conditions to prevent delays and consider preparing for power cuts by gathering essential items like torches, batteries, and a mobile phone power pack. Be ready for weather warnings to change rapidly by staying updated with the forecast in your area from the Met Office.