Hurricane Sally moved slowly closer to the US Gulf Coast on Tuesday...
I read the above at Timesofindia.com.
Why do we need "closer" and "close"?
Is it an adjective in the given context?
JigneshbharatiWhy do we need "closer" and "close"?

I only see "closer".

It moved so that it was closer to the coast than it had been earlier. It has not reached the coast.

If it had moved to the coast, it would now have reached the coast.


JigneshbharatiWhy do we need "closer" and "close"?

It is used with reference to a middle point. The hurricane which was equal distance to two regions has moved closer to one.

It is an adverb here as it modifies the verb, move.

 CalifJim's reply was promoted to an answer.