Met Office Issues Yellow Thunderstorm Warning for Gloucestershire and Surrounding Areas

The Met Office has issued a yellow thunderstorm warning covering various parts of the UK, including Gloucestershire, South Gloucestershire, and areas of Wiltshire such as Swindon. The warning takes effect at 3am on Wednesday, 26 August, and will remain active until 10pm the same day.

Forecasters predict a band of heavy showers and thunderstorms moving northwards on Wednesday morning. While a drier, brighter period may follow, there is potential for further showers and thunderstorms developing during the afternoon. Although many places may avoid these storms, where they occur they could be intense, with rainfall totals of 20 to 30mm in less than an hour, and possibly 40 to 50mm over two to three hours in some locations. This could result in surface water flooding.

Additionally, the storms may bring large hail and frequent lightning. The showers are expected to drift northwards and ease off during the evening.

The Met Office uses a tiered warning system based on the severity and likelihood of severe weather impacts. Yellow warnings indicate that travel and daily activities may be disrupted, though they are unlikely to endanger life or cause significant property damage. Amber warnings suggest more severe conditions, advising people to consider altering plans to reduce risk. Red warnings signify severe danger, with widespread damage and risk to life, often accompanied by public advice to avoid travel.

In this instance, there is a small chance of rapid flooding impacting homes and businesses, along with potential damage from floodwater, lightning strikes, or hail. Flooding and lightning may cause delays or cancellations to train and bus services. Drivers should be cautious due to spray, sudden flooding, and possible road closures. There is also a slight possibility of power outages and interruptions to other services affecting some households and businesses.