NOAA has adopted the scam of conflating the two statistics, i.e.

The odds of a 6 inch daily rain this year in Boulder are 1,000:1

It is a garbage statistic. The meaningful statistic is :

The odds of a 6 inch daily rain along the Colorado Front Range this year are 3:1

Had the 6 inch rain fallen at a different location along the Front Range, they would have moved their scam statistic to that location. Junk science at its worst.