Most of the pungent (storage) onions are the long day type. I don't know of any short day onion that is in this class. Don't know of any intermediate day onions that are pungent either, but I am not as familiar with this type.

i live in north al near huntsville. my mother grew pungent onions 50 years ago before sweet was the rage.i have been looking for keeper onions with out any luck. seems any where they have plants they are all sweet.