Hello there

I thought that this would be the best place to ask a question about
barometric pressure - it's a subject that I know nothing about so please
bear with me!

The question is this:

Taking the stormy weather that is apparently going to hit southern
England later on today as an example, does barometric pressure drop some
time in advance of the weather changing? And if so, how far in advance
can this happen? Or is it that the weather changes as the barometric
pressure drops?

This is probably a bit of a daft question but if anyone can answer this
for me I'd be grateful

All the best

Ruth