Overview

• A yellow weather warning for thunderstorms is in effect today (May 12) from 12 pm to 10 pm, covering Wales, the West Midlands, South West England, and London.
• Forecasters predict intense rainfall of 20–30 mm in under an hour and up to 40–50 mm in 1–2 hours in isolated areas, increasing the risk of flash flooding.
• Hazards include hail, lightning, gusty winds, and potential power outages, with disruptions to travel and localized flooding likely in affected regions.
• The storms follow a warm, dry spring and a weekend of unseasonably high temperatures reaching 25–26°C, about 8°C above average.
• High-pressure conditions are expected to return from Tuesday, bringing dry, sunny weather and temperatures in the low to mid-20°C range.