Howdy Mark,Interesting your post today coincided with a series of contrails across south central Texas today stretching from Houston to San Antonio.
There were impressive in they appeared as a giant tick tack toe checkerboard crisscrossing. the sky as far as could be seen.
Wow!.Our esteemed Senator for Texas, Mz Kay Bailey Hutchinson was the prime mover for funding legislation for weather modification studies including cloud seeding.
Richard
