The UK Met Office has issued multiple yellow weather warnings across large parts of the country due to expected thunderstorms, heavy rain, hail, and potential flash flooding. These warnings cover areas including Northern Ireland, Scotland, northwest England, Wales, southeast England, and other eastern regions. Heavy thundery downpours were reported on Monday morning, with flooding possible in some locations. Although some drier and brighter intervals are expected, the overall weather pattern remains unsettled with persistent rain in western areas and northwest Scotland. Temperatures are forecasted to rise following the period of heavy rain and thunderstorms. Weather authorities advise the public to stay aware of changing conditions as further heavy showers and downpours are anticipated throughout the week.