Central belt of the IOW has been stuck under a home grown convayor belt of downpours for about 90 minutes now. I can see them from my location in southsea and netweather radar confirms it, no thunder as of yet though.
The showers are occasionally spilling out and clipping us in southsea - literally just clipping the portsmouth coastline.
Given the rain rates and duration I would assume some areas on the IOW have already seen over an inch fall in the past 90 minutes.