Recent studies showed that the Rocky Mountain drought is a combination of low precipitation and high temperatures. The low precip is obvious, but the high temps cause higher evaporation and evapotranspiration by plants, reducing ground water and river flows even more.
If you look at the overlap between dry and warm in these winter outlooks, seems like drought for eastern Oregon, eastern Washington, northern Nevada, northwestern Utah, and all of Idaho.
But I am not a climate forecaster, and don't play one on TV.
[Edit: Make that northWESTERN Utah.]