Why are we so bad at long range weather forecasting?

By WUWT regular “justthefacts” In researching the use of tidal forces in long range weather forecasting, I came across an interesting August 30th, 2010 Associated Press/ MSNBC article based on interviews with Farmer’s Almanac Editors Sandi Duncan and Peter Geiger, and Ed O’Lenic from NOAA’s Climate Prediction Center: “Good news, winter haters: After record snowfall…