That was on the 19th from http://portland.indymedia.org/en/2003/05/264968.shtml
Did we have white skies yesterday? Grids in the skies today? You betcha'. Am I the weatherman? Nope. But it doesn't take a meteorologist to guess that, since the pattern with these chemtrails seems to be 72 hour blocks of heavy aerial spraying every couple of weeks. Grids of planes spraying aerosoled particulates of what has aparently been identified as Aluminum Oxide, Barium, Magnesium, Quartz and/or biological material
The articles below illustrate my observation of the three day blocks:
No Press Releases for Covert Programs-Chemtrails Past 72 hrs.
Second Day of PDX Chemical Spraying As Heavy As The First
This snippet of extrapolated information is important since very little is known for sure about this covert military spraying campaign. A few things we can figure out simply by connecting the dots, though. For instance, a program such as this would obviously require a fleet of pilots. We can also imagine the program would be monitered by a handful of eggheads who would make adjustments and handle the logistics. I think that we can also be pretty sure that at least one of the miltary bases involved with these activities would be NORAD inside Cheyenne Mountain in Colorado since nothing happens in US/Canadian airspace without NORAD's say-so (...except those four hijacked planes on 9/11. NORAD sez: "My Bad!").
So chemtrails come in approximately 72 hour blocks of heavy activity with weeks in between of little or no activity at all. Unfourtunately, aside from a few other details like the elements thought to be sprayed, the usual lack of identifying markings on the planes painted silver or white and of course, the unusual grid, criss cross flight patterns, we do not have much reliable information on the why's, how's and who's of this program. Notably the current and former official Air Force colors are white and silver--look at 'em with binoculars. I would be surprised if the Air Force was not the arm primarily concerned with the chemtrail program given the Vision 2025: Weather as a Force Multiplier paper it put out. I would also guess that many more other government agencies than I can say five times fast are involved that I have not implicated.
So the inevitable question, at least for the more naive of us, is well, that's an awful lot of people involved with this totally illegal project--why don't they talk about it? The answer is simple enough though, as it has worked for such incredibly secret programs such as the Manhattan Project: