The attempt to refute the validity of a long-term projection(climate) by referring to the inherent unpredictability of the weekend forecast(weather) was the fallacy I was pointing out. 
This would be like saying that since I cannot predict that a roll of a six sided die will be a one, is is therefore false that the odds of rolling a one over infinity rolls is 1/6.
Your point about the use of the word confirming was correct, the author should have said something like "lending weight to", or "providing evidence for".