Firstly, let me cover the rainfall in Pevensey. I would suggest that you will see some heavy potentially thundery showers this afternoon, tapering off into the evening.
The radar shows a lot of showers over the UK already, www.raintoday.co.uk
The SE is an area where there is a higher chance...
The BBC automated forecasts are computer generated and liable to changes each time new data becomes avaialble.
In fact all the 'app' forecasts out there (Accuweather, Apple) are computer generated , most from the GFS data set. This is generated 4x daily and is liable to fluctuations.
This...