My 2011 registration Stormy Morn can develop blooms 7-8+ " in height - standards and falls measured together, and nearly equal in width, since the falls head straight down and don't flare much at all. I registered the height at 34", but it regularly puts up stalks 40" or taller.
Theres no evidence of gigantism in either the the parents that i used -- Block Party X Sea Power, but this variety is quite a bit larger, foliage wise, stalk thickness, and overall vigor than either of its parents.