The Met Office has warned that "severe thunderstorms" forecast to hit Herts and Essex tomorrow (Friday) could come earlier than expected.The national weather service issued a yellow "be aware" alert yesterday, which applied from noon tomorrow until 7am on Saturday.It has since updated the warning, which will now come into force at 1am tomorrow and last until 9am on Saturday.An accompanying assessment from the chief forecaster says that large amounts of rain will fall "on...
