The Greater OKC Metro Area just cannot have reinforced bunkers 30 feet underground that are within a few minutes access to accomodate the entire population no matter where they happen to be when a storm hits.
They don't need reincorced bunkers 30' underground. Normally a basement is sufficient in a tornado, preferably also under the stairs or in a smaller more contained area or a corner on the windward side. Barring that an upstairs interior closet or as a last resort a bathtub with a mattress over you. The biggest threat is always flying debris.
We have tornado's here in the Minneapolis St Paul area too. I've lived through one that snapped and downed trees hitting homes on all sides but totally skipped over me and watched another to the north while driving down the freeway from St Paul to Minneapolis but nothing like what hit OK.
On the news this morning I saw the former Governor of OK saying that shelters were relatively cheap and that they should have them particularily at schools.
Condolences to those that lost loved ones and encouragement to those that will pick themselves up and rebuild.