just asking . . .

How is it that in the good old days of last week (or maybe last month) the Houston Chronicle reported the rain chances on the weather page in increments of 10%, 20% etc. Now suddenly, they seem to have refined this. The rain chances tonight are 8% (low temperature 65) - for tomorrow the low temperature is forecast as 45 degrees and rain chances are 13% . . . In the old days with the increments of forecast given in 10s, the newspaper's accuracy was suspect . . . but suddenly, they've refined forecasting to the nth degree? 8% chance of rain tonight????!? Where (excuse the lack of French in what follows) in hell does this refinement come from?