This, pasted from the Weather Channel site and the fine folks at the National Weather Service. It’s the best example of how to say “we don’t know diddley, but we are not sure how to admit that.” Attorneys take years of deep schooling to learn to write like this (caps are theirs, not mine):

issued by The National Weather Service
Nashville, TN
3:26 pm CST, Mon., Jan. 24, 2011

SO FAR THIS SEASON WE HAVE HAD FAIRLY HIGH CONFIDENCE ON OUR SNOW EVENT FORECASTS… BUT WEATHER PATTERNS HAVE CHANGED… AND CONFIDENCE IS NOT AS HIGH FOR THIS EVENT IN TERMS OF SNOW ACCUMULATIONS. NEVERTHELESS… RECENT COMPUTER MODEL FORECASTS HAVE BECOME MORE IN AGREEMENT… AND IF THIS TREND CONTINUES TONIGHT AND TUESDAY… CONFIDENCE IN SNOW ACCUMULATIONS WILL IMPROVE.