George, there is a lot of good information in the thread down the page a bit titled Nobile Den Growth.

Maybe it is something in your conditions or an abnormal weather event that caused the out of season flowering.

There were Nil plants benched July in the Nobile Hybrid section at a local orchid society meeting. I expect a few next Monday and lots in September/October at the local orchid society meetings and orchid shows. (Southern Hemisphere)

Why so early there and as for this Yamamoto stuff, it is a marketing triumph. Are they the only hybridisers of Soft-canes in the USA?
They produced Den. Yukidaruma in the early 1970 and it is an early bloomer but in all other ways it is an old fashioned type. We have two specialist Soft-Cane growers in the local orchid society who wouldn't have a clue whether their orchids were bred by Yamamoto or Fred down the road.

George, many of the warm growth nobiles (yamamoto types) are capable of blooming more than once a year since the chill requirement for blooming has been bred out of them. So its no surprise they would be blooming now. I have one, a miniature nobile, that is just finishing its 2nd blooming this year.