alaskan9974 From , joined Dec 1969, posts, RR: Posted (9 months 1 week 4 days 6 hours ago) and read 1594 times:
Nearly every a/c out of here today has had vortices from the props, most pronounced with a herc that took off earlier. Originally on video, had to take a screen grab to share. What are the best conditions for these to form? Temp was in the teens and low humidity, opposite of what I thought optimal conditions were, high humidity and dewpoint close to air temp.