Did Mt. Saint Helen's Shatter Windows?

[racer72]

I was in Yakima when the mountain blew. We heard a “whump” sound then about 5 seconds of rumbling. A radio station announced about 5 minutes later what happened. I bailed out of town to get home to Tacoma. Glad I did, those that stayed had to deal with ash about an hour later.

[Enola_Straight]

@susan

**Yet many areas closer to the eruption (Portland, Oregon, for example) did not hear the blast. **This so-called “quiet zone” extended radially a few tens of miles from the volcano and was created by the complex response of the eruption’s sound waves to differences in temperature and air motion of the atmospheric layers and, to a lesser extent, local topography.[5]" [emphasis added].

The phenomenon of Acoustic Shadows were first encountered during The American Civil War; sounds of battle could often be head in far away locales when an audience markedly closer to the battlefield heard nothing.

Acoustic shadow