I remember a book that was about a secret war being carried out by Russia against America (and with retaliation) that used weather as a weapon. One of the main characters was a weatherman that started to figure this out: there was no declared war, but epic floods would ravage Texas then Moscow would see a "blizzard for the centuries" and back and forth.
Given when I would have read it, the story must actually have been published in the 70s. It wasn't written by a big name author either.
The story went something like this: a TV weatherman started noticing that odd "freaks of nature" would afflict cities in the US and the Soviet Union. For example, there'd be a blizzard of unparalleled force that struck Moscow... then subsequently, there'd be unparalleled flooding in part of the US - or the worst tornado season on record... and back and forth it would go.
The weatherman discovered this and tried to unravel the real truth behind the events happening. In essence, the US and the Soviet Union were fighting a silent "weather war" against each other.
I distinctly remember a massive flood being part of the story in the lower Mississippi (I think) - I guess that rules out Texas, but could be Louisiana or Arkansas I'm guessing. I'm not as sure, but I think the story included massive blizzards in Moscow or Leningrad as well. I also seem to remember a love interest for the male lead, the TV weatherman.
I want to say it was called The Weatherman but I can't find it by that title anywhere. The Weathermakers by Ben Bova doesn't seem to be it either.