The bloody Met Office website seems to have gone completely screwy for me. Earlier today it seemed to think it was still Friday and was offering me forecasts accordingly. After deleting browsing data etc. it now thinks it's yesterday. But if I look at the forecast for Wickford, which although 10 miles to the west of Southend is still in the same time zone, it says it's today.
Meanwhile, my brother reports having had 18mm rain in an hour this afternoon, whereas Stock, a village only a couple of miles from his house, had none.