|Courtesy of the Stringmans on Whidbey Island|
I snagged that picture from his blog. Here is what he had to say about the weird holes:
No...these were not alien incursions into Washington air space, but the impact of aircraft passing through a cloud deck of supercooled water (liquid water at 32°F or below). The planes climbing or descending through the clouds caused the supercooled water to turn to ice crystals and fall out, leaving a circular hole. These features are also known as "punch hole" clouds and often form in mid-level altocumulus cloud decks.Actually, I think he was just covering up for the aliens. I've never seen anything like these before. Have you?