Swindon and parts of north Wiltshire were put under a yellow weather warning for thunderstorms, Wiltshire 999s reported on Tuesday 25 August 2026. The Met Office warning was due to run from 6am to 10pm on Thursday 27 August.
What was forecast
A band of thunderstorms and heavy rain was expected to move north across England and Wales, and possibly become slow-moving during the afternoon and evening.
- 20mm to 30mm of rain in three hours was expected fairly widely.
- Some places could see up to 50mm over 12 hours.
- There was a small chance of more than 50mm in three hours, and totals above 75mm over 12 hours were possible, mainly over east-facing high ground.
- Lightning and hail of 1cm to 2cm were also expected.
What it could mean
The Met Office said there was a small chance that homes and businesses could be flooded quickly, and that buildings could be damaged by floodwater, lightning, hail or strong winds.
Drivers were warned of spray, sudden flooding and possible road closures. Train and bus services could be delayed or cancelled, and there was a slight chance of power cuts.
This report covers the warning as it was issued. The source page does not say what weather followed on the day.
Source: Wiltshire 999s.