Since details about meetings aren't released, neither are the reasons why [read reasons] the CSC chooses one type of stamp over any other. [Saabira Chaudhuri, "Snail Mail: It Takes Awhile [read a While (see below)] to Get This Stamp of Approval," Wall Street Journal (wsj.com), July 22, 2011)
Bryan Garner says reason why is mildly redundant, but . . .
. . . he approves its usage as well-accepted idiom. Objecting (as I am doing) is a superstition, he says. Still, journalists should avoid the usage for the same reason [not reason why] they avoid many others: to save ink. Really, what's the point of why?
Snail Mail: It Takes Awhile [read a while] to Get This Stamp of Approval. (Headline, Wall Street Journal (wsj.com), July 22, 2011)
While used as a noun (as here) is a while. When used as an adverb, it's awhile.
Good writing about style, usage, journalism
BECAUSE NOBODY else can understand them, modern economists speak to one another. They gossip in algebra and remonstrate in differential calculus. And when the pungently correct mathematical equalion doesn't occur to them, they awkwardly fall back on the English language . . . . (James Grant, "The Man, the Statesman," Wall Street Journal (wsj.com), July 23, 2011, reviewing Frederic Bastiat, The Man and the Statesman (Liberty Fund 2011))