UK faces unpredictable weather in September due to jet stream

September is shaping up to be an unpredictable month for the UK, with the Met Office attributing this variability to the jet stream's behavior. Experts have noted a mix of rainfall, thunderstorms, and fog alongside periods of settled weather and sunshine, creating a challenging forecast as summer comes to a close. The uncertainty in the weather patterns is expected to persist beyond midweek, complicating predictions for the coming days. According to Met Office Deputy Chief Meteorologist Nick Silkstone, the forecast remains particularly uncertain due to complex interactions within the jet stream. This interaction will influence the positioning of high and low-pressure systems relative to the UK. The most likely scenario suggests that warm air will return to southern and possibly central regions, leading to cloudier conditions and the risk of thunderstorms, while northern areas may experience brighter and more settled weather. Warnings for thunderstorms are currently in effect across the UK, with meteorologists forecasting significant rainfall. On a recent Sunday, many regions experienced sudden downpours and thunder, with similar weather anticipated in the following days. The Met Office has issued a yellow warning, which has been extended to cover large areas of the country, indicating the potential for flash flooding due to heavy rain. As the week progresses, the Met Office aims to clarify the weather outlook by late Tuesday, allowing for a more accurate prediction of the prevailing conditions. The public is advised to stay informed about the evolving weather situation as the jet stream continues to play a crucial role in shaping the UK's climate this September.