Thanks Khoff and GG.
If you want to exclaim "Oh my goodness! It's just pouring out there!" then use "out there."
If it is OK to exclaim as the above, why can't we use 'outside' as it is as ridiculous to say 'it's pouring inside' as ' it's pouring in here'?
I'm a bit lost. I guess this is one of those questions without an answer.