The Met Office has reiterated and expanded its safety guidance for thunderstorms, drawing attention to less commonly known risks, including the use of landline telephones. This advice is crucial as summer months often bring an increased risk of lightning strikes and severe weather across various regions of the UK.
A central tenet of the Met Office's guidance is the importance of staying indoors and avoiding contact with electrical equipment during a thunderstorm. This includes televisions, computers, and even fixed electrical installations. The rationale behind this is the potential for lightning to travel through electrical wiring and plumbing, posing a significant electrocution risk to individuals in contact with these systems.
However, a particular point highlighted by the Met Office, and often overlooked by the public, concerns landline telephones. While mobile phones are generally considered safe due to their lack of a direct wired connection to the outside, landlines can act as a conduit for lightning strikes. The advice is to avoid using wired landline telephones during a storm, as the electrical current from a lightning strike could travel along the telephone line into the handset.
Beyond indoor safety, the Met Office also provides critical advice for those caught outdoors or driving during a thunderstorm. Individuals should seek shelter immediately, avoiding open spaces, isolated trees, and metal objects. If driving, motorists are advised to slow down, keep their windows closed, and avoid touching metal parts of the vehicle. The metal shell of a car can offer some protection by acting as a Faraday cage, diverting the electrical current around the occupants.
While specific regional warnings for current thunderstorm activity were not detailed in the source, the Met Office routinely updates its forecasts and warnings for England, Scotland, Wales, and Northern Ireland. These updates typically include information on the likelihood of lightning, heavy rainfall, and strong winds, with potential impacts ranging from localised flooding to power outages. Temperatures during summer thunderstorms can vary widely but often precede or follow periods of hot, humid weather, creating the atmospheric conditions conducive to storm development. Wind speeds associated with thunderstorms can be strong, potentially reaching 40-60 mph in gusts, particularly around severe storm cells.
For instance, a yellow warning for thunderstorms might indicate a slight chance of power cuts and disruption to travel. During such periods, temperatures could be around 20-25°C before a storm, dropping slightly afterwards. Staying informed through official Met Office channels is paramount for personal safety during such unpredictable weather events.