Loud tire noise ??

[Solomon Ngan <sngan@netaccess.on.ca>]

Hi everyone,
I still have my Nokian NRW(H) snow tires on.  I'm not sure it is the
cause of some loud road noise during city driving speed. Or I should say
the noise is much more noticable during city driving, especially while
coasting slowly.  It sure sounds like the snow tires, but I don't think
they sounded as loud during the past several winter months.
Do they sound louder after certain wear ?
It sounds louder during decceleration than acceleration.  Is it a
characteristic of snow tire noise ?
Solomon