Overview

• A focused warning for north‑west Wales runs from 3am to midday on Wednesday, with a broader alert for southern areas in force from 6am to 11pm.
• Forecasters expect 30–40mm of rain widely with 50–60mm possible within six hours on south‑west facing hills in the north west, with up to 70mm on south‑west hills further south.
• Natural Resources Wales has active flood alerts across several catchments, with above‑normal river levels and a risk to low‑lying land, roads, and a few properties.
• Travel impacts are likely with spray, surface water and delays, plus 30mph limits currently in place on the M4 Briton Ferry Bridge and the A55 Britannia Bridge with advisory restrictions for vulnerable vehicles.
• Reservoirs are about 54% full per UKCEH, so incoming rain could aid supplies even as forecasts point to several more wet, windy days before a possible drier spell late month.