Looking at our logs, refers from Yahoo went from an average of 1800 to 2000 a day (from Feb 1 to July 19) to less than 800 on July 20.

So far, 9 hours into the day, I am at 300 refers from Yahoo.

Updates like Google? etc?

Yahoo has always been stable when it comes to refers, never a drop like this.

When I search for some of the key terms i monitor, ranking has not dropped.

Thanks

mid-week last week they unrolled a new search algo/change/refresh. That would be the cause, hopefully it's not permanent until the next update