alaskan9974 From United States of America, joined Oct 2011, 46 posts, RR: 0 Posted (1 year 5 months 6 days 15 hours ago) and read 1848 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.