article_snippet.sent: It also threatens to cause a wet and miserable time for the thousands of runners taking part in Sunday's London Marathon.
article_snippet.sent: The Met Office has forecast rain through the morning in the capital with the chance of thunderstorms and heavy downpours early on.
article_snippet.sent: Enjoy it while it lasts: Torrential rain, thunder and even hail have been predicted by forecasters .
highlights_snippet.sent: Forecaster also predict thousands of runners could be in for wet London Marathon .