posted 01-14-2002 07:26 PM            

I'm not sure if you're still watching the group. Maybe you've been busy up in the skys or taken a bit of time off away from the computer.

Never the less, I would like to know this.

In San Diego, we get "Santa Ana" winds from the desert. During this time period, the wind shifts direction and blows from the east instead of from the coast... Usually the air drys out to around 20-30% humidity, which is a huge deviation from the normal 80-90% we have here. The temperature also usually soars up to high 70's on the coast, and high 80's when you're inland a bit.. And that is in the winter time. We love our Santa Anas!

However, there is one BIG piece of the puzzle I don't get. Santa Ana conditions usually remove the ability for con/chem trails to be persistant, and there is normally not a cloud in the sky. This is how our Santa Ana went down this weekend:

Thursday: Not a trail in the sky...
Friday: Not a trail in the sky.. I saw a few comits when watching, but that was it
Saturday: Trails all over the place!! Keep in mind it was the same weather conditions on the ground on Saturday.
Sunday: Not a trail in the sky.

Why?

And if you have a good explanation, maybe you could explain what ideal conditions in the sky cause the contrails to be persistent... I mean I always heard humid cold air, but do we have specifics like the humidity must be greater then 50% and the temp 50 below or whatever?