Odd Rainbow: Any Ideas

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Photos are numbered in the order they were taken. 

I saw this same thing yesterday over my grandmother’s house (so, two days in a row).  For the record, I live in CT, and it’s been pretty nice out- especially for fall. 

I’ve simply never seen rainbows like this before, just that one patch and that was it (both times were the same thing). 

Anyone know what causes it?