You need to ask which keywords are no longer getting Google traffic, and which pages are no longer getting Google traffic, too.
Thank you for the input.
Unfortunately, it is near universal. Lots of Keywords in all sorts of different categories have all seen a drop.
I think the google autofill feature might be a factor here, because there are some alternate spellings for certain products I carry that are performing BETTER, even though I have not optimized for those spellings (in fact, I don't think those alternate spelling even appear on my site).
I unfortunately never bothered keeping track of where I ranked in the SERPs, so I won't have a way to compare it to the past. All I guess I can do now is try and see where I rank currently and see who is ahead of me, and try and diagnose those sites. That sounds like a mighty uphill climb though...
Log into your Webmaster Tools and see if there are any messages, any crawling problems.
That's the thing. webmaster tools looks clean!
the only thing I can think of is that I DID have about 20 pages that had short meta descriptions (only the page title appeared as the meta description).
So I went through those 20 pages and basically took the first paragraph as text and used that as the paragraph description. But those were pages that (for the most part) weren't getting much traffic anyway, so I don't suspect that is a major factor.
While I know how to USE google analytics, I guess I don't know how to draw actionable information from it.
"I saw a drop on that day too and looking at the WMT it seems to be attributed to the image search."
Thank you for suggesting that.
I will have to look into that. I think that I do get a good share of traffic from image search.
"It dropped to a low on sep 15 and it remains around that level since then.I do believe that there is a minor algo change since mid september..."
I checked my other main site, and it is down a more modest 8% when comparing the period of Sept. 13th through Sept. 24th to the previous period of September 1st through September 12th.
On this other site, When I compare July 1st through September 24th to the period of Apr 6th through June 30th, I see that I am down about 10%