Why did an impression spike kill my organic growth?
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First off, none of your attachments are showing up. Second your CTR may have been really low causing google to assume your site is less appealing to the searchers. I would definitely check that out.
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Kent is right. You need to check the CTR in Web Master Tools prior and during the impression spike.
That spike in impression is correlated with either a spike in rankings for current keywords you had or a lot of new pages you've publish in the past or recently got in the index with good rankings.
If your CTR was low, so your entries didn't appeal to the users it means, from Google's point of view, you don't really deserve to rank.
More then that check the organic traffic time on page (for entry pages) and pages view for each organic entry to see how users did behave once they click in. If those numbers are not very "friendly" there is a high chance that the users bounced back in search looking for a different result - and that again can cause a massive organic drop.
CTR and low organic user behavior patterns will drop your organic numbers and in most cases as far as we've seen it's always more visibile after a spike in impressions.
Hope it helps.
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