Therefore, I can only offer some unproven conjecture.
They are: (1) Man induced, in one form, or the other.
(2) Results from experiments with the
Military's 'HAARP Program.'
[High-Frequency Active Aural Research Program]
(3) Possible underground nuclear test
by India, China or Pakistan.
(4) Aerial spraying certain "Chem-Trails"
to achieve certain military
objectives.
Suggest you go to your search engine and type in 'HAARP.' I promise, you will be shocked.
I have Dr. Nick Begich's book, "Angels Don't
Play This HAARP." Facinating and well documented.
Dr Begich's Book thesis is, the military's HARRP objective is weather & people control. Orwellian, huh?
By beaming high RF energy into the upper atmosphere, the natural ionization, and atomic structure of the atmosphere is "altered" and consequently induces changes in weather patterns, such as jet streams, ect
These are my initial thoughts. Read up on HAARP, and share with me your conclusions.