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Yes, it is possible. I might say adding 'ли' is mostly preferable if you want to sound polite.

Да, мало употребляемая форма. Но я её использую. ;)

Nobodys says something like "Ах, ещё идёт снег?" This "ах" sounds either gayish or theatrical. You could use it sometimes in writing, but never say it aloud for not giving people another cause to...